10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015

Commission file number: 001-32550

WESTERN ALLIANCE BANCORPORATION

(Exact name of registrant as specified in its charter)

Delaware	88-0365922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One E. Washington Street Suite 1400, Phoenix, AZ	85004
(Address of principal executive offices)	(Zip Code)

(602) 389-3500

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, $0.0001 Par Value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ý    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

The aggregate market value of the registrant’s voting stock held by non-affiliates was approximately $2.36 billion based on the June 30, 2015 closing price of said stock on the New York Stock Exchange ($33.76 per share).

As of February 10, 2016, Western Alliance Bancorporation had 103,418,400 shares of common stock outstanding.

Portions of the registrant’s definitive proxy statement for its 2016 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.

INDEX

		Page
PART I
Forward-Looking Statements		3
Item 1.	Business	5
Item 1A.	Risk Factors	13
Item 1B.	Unresolved Staff Comments	23
Item 2.	Properties	24
Item 3.	Legal Proceedings	24
Item 4.	Mine Safety Disclosures	24
PART II
Item 5.	Market for the Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	25
Item 6.	Selected Financial Data	27
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	29
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	80
Item 8.	Financial Statements and Supplementary Data	82
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	156
Item 9A.	Controls and Procedures	156
Item 9B.	Other Information	158
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	159
Item 11.	Executive Compensation	159
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	159
Item 13.	Certain Relationships and Related Transactions, and Director Independence	159
Item 14.	Principal Accountant Fees and Services	159
PART IV
Item 15.	Exhibits and Financial Statement Schedules	159
SIGNATURES		163

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PART I

Forward-Looking Statements

Certain statements contained in this Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (this “Form 10-K”) are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (the “Reform Act”). Statements that constitute forward-looking statements within the meaning of the Reform Act are generally identified through the inclusion of words such as “aim,” “anticipate,” “believe,” “drive,” “estimate,” “expect,” “expressed confidence,” “forecast,” “future,” “goals,” “guidance,” “intend,” “may,” “opportunity,” “plan,” “position,” “potential,” “project,” “ seek,” “should,” “strategy,” “target,” “will,” “would” or similar statements or variations of such words and other similar expressions. All statements other than historical fact are “forward-looking statements” within the meaning of the Reform Act, including statements that are related to or are dependent on estimates or assumptions relating to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions that are not historical facts. These forward-looking statements reflect our current views about future events and financial performance and involve certain risks, uncertainties, assumptions and changes in circumstances that may cause our actual results to differ significantly from historical results and those expressed in any forward-looking statement. Factors that may cause actual results to differ materially from those contemplated by such forward-looking statements include, but are not limited to, those described in “Risk Factors” in Item 1A of this Form 10-K. Forward-looking statements speak only as of the date they are made and we undertake no obligation to publicly update or revise any forward-looking statements included in this Form 10-K or to update the reasons why actual results could differ from those contained in such statements, whether as a result of new information, future events or otherwise, except to the extent required by federal securities laws. In light of these risks, uncertainties and assumptions, the forward-looking events discussed in this Form 10-K might not occur, and you should not put undue reliance on any forward-looking statements.

Purpose

The following discussion is designed to provide insight on the financial condition and results of operations of Western Alliance Bancorporation and its subsidiaries. This discussion should be read in conjunction with the Company’s Consolidated Financial Statements and notes to the Consolidated Financial Statements, herein referred to as “the Consolidated Financial Statements.” These Consolidated Financial Statements are presented in Item 8 of this Form 10-K.

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GLOSSARY OF ENTITIES AND TERMS

The acronyms and abbreviations identified below are used in various sections of this Form 10-K, including "Management's Discussion and Analysis of Financial Condition and Results of Operations," in Item 7 and the Consolidated Financial Statements and the Notes to Consolidated Financial Statements in Item 8 of this Form 10-K.

ENTITIES:
AAB	Alliance Association Bank	FIB	First Independent Bank
ABA	Alliance Bank of Arizona	LVSP	Las Vegas Sunset Properties
BON	Bank of Nevada	TPB	Torrey Pines Bank
Bridge	Bridge Bank	WAB or Bank	Western Alliance Bank
Centennial	Centennial Bank	WAL or Parent	Western Alliance Bancorporation
Company	Western Alliance Bancorporation and subsidiaries	Western Liberty	Western Liberty Bancorp
TERMS:
ABS	Asset-Backed Securities	GLBA	Gramm-Leach-Bliley Act of 1999
AFS	Available-for-Sale	GSE	Government-Sponsored Enterprise
ALCO	Asset and Liability Management Committee	GSIB	Global Systemically Important Banks
AMT	Alternative Minimum Tax	HFI	Held for Investment
AOCI	Accumulated Other Comprehensive Income	HFS	Held for Sale
ARP	Annual Percentage Rate	HMDA	Home Mortgage Disclosure Act
ARPS	Adjustable-Rate Preferred Stock	HOEPA	Home Ownership and Protection Act of 1994
ASC	Accounting Standards Codification	HTM	Held-to-Maturity
ASU	Accounting Standards Update	ICS	Insured Cash Sweep Service
ATM	At-the-Market	IRC	Internal Revenue Code
BHCA	Bank Holding Company Act of 1956	ISDA	International Swaps and Derivatives Association
BOD	Board of Directors	LIBOR	London Interbank Offered Rate
BOLI	Bank Owned Life Insurance	LIHTC	Low-Income Housing Tax Credit
BSA	Bank Secrecy Act of 1970	LTD	Long-Term Debt
CAMELS	Capital Adequacy, Assets, Management Capability, Earnings, Liquidity, Sensitivity	MBS	Mortgage-Backed Securities
CBL	Central Business Lines	MLC	Management Loan Committee
CCO	Chief Credit Officer	MOU	Memorandum of Understanding
CDARS	Certificate Deposit Account Registry Service	NOL	Net Operating Loss
CDO	Collateralized Debt Obligation	NPV	Net Present Value
CEO	Chief Executive Officer	NUBILs	Net Unrealized Built In Losses
CFO	Chief Financial Officer	OCI	Other Comprehensive Income
CFPB	Consumer Financial Protection Bureau	OFAC	Office of Foreign Asset Control
CLO	Collateralized Loan Obligation	OREO	Other Real Estate Owned
CMO	Collateralized Debt Obligation	OTTI	Other-than-Temporary Impairment
COSO	Committee of Sponsoring Organizations of the Treadway Commission	PCI	Purchased Credit Impaired
CPP	TARP Capital Purchase Program	QRM	Qualified Residential Mortgage
CRA	Community Reinvestment Act	RESPA	Real Estate Settlement Procedures Act
CRE	Commercial Real Estate	SBA	Small Business Administration
DIF	FDIC's Deposit Insurance Fund	SBIC	Small Business Investment Company
EPS	Earnings per share	SBLF	Small Business Lending Fund
EVE	Economic Value of Equity	SEC	Securities and Exchange Commission
Exchange Act	Securities Exchange Act of 1934, as amended	SERP	Supplemental Executive Retirement Plan
FASB	Financial Accounting Standards Board	SLC	Senior Loan Committee
FCRA	Fair Credit Reporting Act of 1971	SSAE	Statement on Standards for Attestation Engagements
FDIC	Federal Deposit Insurance Corporation	SOX	Sarbanes-Oxley Act of 2002
FHA	Fair Housing Act	TARP	Troubled Asset Relief Program
FHLB	Federal Home Loan Bank	TDR	Troubled Debt Restructuring
FICO	The Financing Corporation	TEB	Tax Equivalent Basis
FRB	Federal Reserve Bank	TILA	Truth in Lending Act
FVO	Fair Value Option adjustment on junior subordinated debt	TRID	TILA-RESPA Integrated Disclosures
GAAP	U.S. Generally Accepted Accounting Principles	XBRL	eXtensible Business Reporting Language

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Item 1. Business.

Organization Structure and Description of Services

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB northern California offices are operating as a combined division, with their results reported under the Company's Northern California operating segment.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

WAL also has eight unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities as described in "Note 10. Qualifying Debt" in Item 8 of this Form 10-K.

Bank Subsidiary

At December 31, 2015, WAL has the following bank subsidiary:

Bank Name	Headquarters	Number of Locations	Location Cities	Total Assets		Net Loans		Deposits
				(in millions)
Western Alliance Bank	Phoenix, Arizona	47	Arizona: Chandler, Flagstaff, Mesa, Phoenix, Sedona, Scottsdale, and Tucson	$	14,155.3	$	10,980.3	$	12,038.8
			Nevada: Carson City, Fallon, Reno, Sparks, Henderson, Las Vegas, Mesquite, and North Las Vegas
			California: Beverly Hills, Carlsbad, Costa Mesa, La Mesa, Los Angeles, Oakland, Palo Alto, Pleasanton, San Diego, San Francisco, and San Jose
			Other: Boston, Massachusetts; Dallas, Texas; Reston, Virginia

WAB also has the following significant wholly-owned subsidiaries:

• WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc. - each hold certain investment securities, municipal and non-profit loans, and leases.

• BW Real Estate, Inc. - operates as a real estate investment trust and holds certain real estate loans and related securities.

• BW Nevada Holdings, LLC - was dissolved on June 12, 2015 after distributing its 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

Market Segments

The Company’s reportable segments are aggregated primarily based on geographic location, services offered, and markets served, primarily in the Arizona, California, and Nevada regions. As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly. The Arizona, Nevada, Southern California, and Northern California segments provide full service banking and related services to their respective markets although operations may not be domiciled in these states. The Company's CBL segment provides banking services to niche markets and, as of June 30, 2015, includes the operations of Bridge. These CBLs are managed centrally and are broader in geographic scope, though still predominately within the Company's core market areas. The

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Corporate & Other segment primarily relates to our Treasury division and also includes other corporate-related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The accounting policies of the reported segments are the same as those of the Company as described in "Note 1. Summary of Significant Accounting Policies" in Item 8. All intercompany transactions are eliminated for reporting consolidated results of operations. Loan and deposit accounts are assigned directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities with a funds credit provided for the use of this equity as a funding source. Any excess equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. Net income amounts for each reportable segment are further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances, and average deposit balances. Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

Lending Activities

Through WAB and its banking divisions and operating subsidiaries, the Company provides a variety of financial services to customers, including CRE loans, construction and land development loans, commercial loans, and consumer loans. The Company’s lending has focused primarily on meeting the needs of business customers.

Commercial and Industrial: Commercial and industrial loans include working capital lines of credit, inventory and accounts receivable lines, mortgage warehouse lines, equipment loans and leases, and other commercial loans. Loans to technology companies, tax exempt municipalities, and not-for-profit organizations are categorized as commercial and industrial loans.

CRE: Loans to finance the purchase or refinancing of CRE and loans to finance inventory and working capital that are additionally secured by CRE make up the majority of our loan portfolio. These CRE loans are secured by apartment buildings, professional offices, industrial facilities, retail centers and other commercial properties. As of December 31, 2015 and 2014, 48% and 46%, respectively, of our CRE loans were owner-occupied. Owner-occupied CRE loans are loans secured by owner-occupied non-farm nonresidential properties for which the primary source of repayment (more than 50%) is the cash flow from the ongoing operations and activities conducted by the borrower who owns the property. Non-owner occupied CRE loans are CRE loans for which the primary source of repayment is nonaffiliated rental income associated with the collateral property.

Construction and Land Development: Construction and land development loans include multi-family apartment projects, industrial/warehouse properties, office buildings, retail centers, and medical facilities. These loans are primarily originated to experienced local developers with whom the Company has a satisfactory lending history. An analysis of each construction project is performed as part of the underwriting process to determine whether the type of property, location, construction costs, and contingency funds are appropriate and adequate. Loans to finance commercial raw land are primarily to borrowers who plan to initiate active development of the property within two years.

Residential real estate: In 2010, the Company discontinued residential mortgage real estate loan origination as a business line, but continues to hold a small number of previously originated (or acquired) mortgage loans.

Consumer: Limited types of consumer loans are offered to meet customer demand and to respond to community needs. Consumer loans are generally offered at a higher rate and shorter term than residential mortgages. Examples of our consumer loans include: home equity loans and lines of credit, home improvement loans, and personal lines of credit.

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At December 31, 2015, our loan portfolio totaled $11.14 billion, including HFS loans, or approximately 78% of total assets. The following table sets forth the composition of our HFI loan portfolio as of the periods presented: 

	December 31,
	2015					2014
	Amount			Percent		Amount			Percent
	(in thousands)
Loans, HFI
Commercial and industrial	$	5,114,257		46.1	%	$	3,326,708		39.7	%
Commercial real estate - non-owner occupied	2,283,536			20.6		2,052,566			24.4
Commercial real estate - owner occupied	2,083,285			18.7		1,732,888			20.6
Construction and land development	1,133,439			10.2		748,053			8.9
Residential real estate	322,939			2.9		299,402			3.6
Commercial leases	148,493			1.3		205,639			2.4
Consumer	26,905			0.2		33,009			0.4
Loans, net of deferred loan fees and costs	11,112,854			100.0	%	8,398,265			100.0	%
Allowance for credit losses	(119,068		)			(110,216		)
Total loans HFI	$	10,993,786				$	8,288,049

As of December 31, 2015, the Company also has $23.8 million of HFS loans. For additional information concerning loans, see "Note 4. Loans, Leases and Allowance for Credit Losses" of the Consolidated Financial Statements contained herein or "Management Discussion and Analysis of Financial Condition and Results of Operations—Financial Condition – Loans discussions" in Item 7 of this Form 10-K.

General

The Company adheres to a specific set of credit standards within its banking subsidiary that are intended to ensure the proper management of credit risk. Furthermore, the Bank's senior management team plays an active role in monitoring compliance with such standards.

Loan originations are subject to a process that includes the credit evaluation of borrowers, utilizing established lending limits, analysis of collateral, and procedures for continual monitoring and identification of credit deterioration. Loan officers actively monitor their individual credit relationships in order to report suspected risks and potential downgrades as early as possible. The WAB BOD approves all changes to loan policy, as well as lending limit authorities. Our lending policies generally incorporate consistent underwriting standards across all geographic regions that the Bank operates in, customized as necessary to conform to state law and local market conditions. Our credit culture has enabled us to identify troubled credits early, allowing us to take corrective action when necessary.

Loan Approval Procedures and Authority

Our loan approval procedures are executed through a tiered loan limit authorization process, which is structured as follows:

• Individual Authorities. The CCO of each region sets the authorization levels for individual loan officers on a case-by-case basis. Generally, the more experienced a loan officer, the higher the authorization level. The maximum approval authority for any loan officer is $1.0 million. Certain members of executive management or credit administration may have higher approval authority.

• Management Loan Committees. Credits in excess of individual loan limits are submitted to the appropriate region’s MLC. The MLCs consist of members of the senior management team of each region and are chaired by each region’s CCO. The MLCs have approval authority up to $7.0 million.

• Credit Administration. Credits in excess of the MLC authority are submitted to the WAB SLC. The SLC has approval authority up to established house concentration limits, which range from $15.0 million to $50.0 million, depending on risk grade. SLC approval is also required for new relationships of $12.5 million or greater to borrowers within market footprint, and $5.0 million or greater outside market footprint. The SLC reviews all other loan approvals to any one borrower of $5.0 million or greater. The SLC is chaired by the WAB CCO and includes the Company’s CEO. Current policy states that over house limit exceptions require unanimous approval of the SLC.

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Loans to One Borrower. In addition to the limits set forth above, subject to certain exceptions, state banking laws generally limit the amount of funds that a bank may lend to a single borrower. Under Arizona law, the obligations of one borrower to a bank generally may not exceed 20% of the bank’s capital, plus an additional 10% of its capital if the additional amounts are fully secured by readily marketable collateral.

Concentrations of Credit Risk. Our lending policies also establish customer and product concentration limits to control single customer and product exposures. Our lending policies have several different measures to limit concentration exposures. Set forth below are the primary segmentation limits and actual measures as of December 31, 2015:

	Percent of Total Capital
	Policy Limit		Actual
CRE	435	%	274	%
Commercial and industrial	400		329
Construction and land development	95		71
Residential real estate	25		20
Consumer	5		2

Asset Quality

General

To measure asset quality, the Company has instituted a loan grading system consisting of nine different categories. The first five are considered “satisfactory.” The other four grades range from a “special mention” category to a “loss” category and are consistent with the grading systems used by Federal banking regulators. All loans are assigned a credit risk grade at the time they are made, and each assigned loan officer reviews the credit with his or her immediate supervisor on a quarterly basis to determine whether a change in the credit risk grade is warranted. In addition, the grading of our loan portfolio is reviewed on a regular basis by our internal Loan Review Department.

Collection Procedure

If a borrower fails to make a scheduled payment on a loan, Bank personnel attempt to remedy the deficiency by contacting the borrower and seeking payment. Contacts generally are made within 15 business days after the payment becomes past due. The Bank maintains regional Special Assets Departments, which generally services and collects loans rated substandard or worse. Each division's CCO is responsible for monitoring activity that may indicate an increased risk rating, including, but not limited to, past-dues, overdrafts and loan agreement covenant defaults. Loans deemed uncollectible are proposed for charge-off and all charge-offs in excess of $100,000 are reported to the WAB BOD.

Nonperforming Assets

Nonperforming assets include loans past due 90 days or more and still accruing interest, non-accrual loans, TDR loans, and repossessed assets, including OREO. In general, loans are placed on non-accrual status when we determine ultimate collection of principal and interest to be in doubt due to the borrower’s financial condition, collateral value, and collection efforts. A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. Other repossessed assets resulted from loans where we have received title or physical possession of the borrower’s assets. The Company generally re-appraises OREO and collateral dependent impaired loans every twelve months. The net gain on sales / valuations of repossessed and other assets was $2.1 million and $5.4 million for the years ended December 31, 2015 and 2014, respectively. Losses may be experienced in future periods.

Criticized Assets

Federal bank regulators require banks to classify its assets on a regular basis. In addition, in connection with their examinations of the Bank, examiners have authority to identify problem assets and, if appropriate, re-classify them. A loan grade six from our internal loan grading system is utilized to identify potential problem assets and loans grades seven through nine are utilized to identify actual problem assets.

The following describes the potential and actual problem assets using our internal loan grading system definitions:

• "Special Mention" (Grade 6): Generally these are assets that possess weaknesses that warrant management's close attention. These loans may involve borrowers with adverse financial trends, higher debt to equity ratios, or weaker

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liquidity positions, but not to the degree of being considered a “problem loan” where risk of loss may be apparent. Loans in this category are usually performing as agreed, although there may be non-compliance with financial covenants.

• “Substandard” (Grade 7): These assets are characterized by well-defined credit weaknesses and carry the distinct possibility that the Company will sustain some loss if such weakness or deficiency is not corrected. We believe that these loans generally are adequately secured and in the event of a foreclosure action or liquidation, the Company should be protected from loss. All loans 90 days or more past due and all loans on non-accrual are considered at least “substandard,” unless extraordinary circumstances would suggest otherwise.

• “Doubtful” (Grade 8): These assets have all the weaknesses inherent in those classified as "substandard" with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable, but because of certain known factors which may work to the advantage and strengthening of the asset (for example, capital injection, perfecting liens on additional collateral and refinancing plans), classification as an estimated loss is deferred until a more precise status may be determined.

• “Loss” (Grade 9): These assets are considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. This classification does not mean that the loan has absolutely no recovery or salvage value, but rather that it is not practicable or desirable to defer writing off the asset, even though partial recovery may be achieved in the future.

Allowance for Credit Losses

Like other financial institutions, the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses charged to expense. Loans are charged against the allowance for credit losses when management believes that collectability of the contractual principal or interest is unlikely. Subsequent recoveries, if any, are credited to the allowance. The allowance is reported at an amount believed adequate to absorb probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with the other factors. For a detailed discussion of the Company’s methodology see “Management’s Discussion and Analysis and Financial Condition – Critical Accounting Policies – Allowance for Credit Losses” in Item 7 of this Form 10-K.

Investment Activities

Our banking subsidiary and holding company have an investment policy, which was approved by the Bank's and Company's BOD. This policy dictates that investment decisions be made based on the safety of the investment, liquidity requirements of the Bank and holding company, potential returns, cash flow targets, and consistency with our interest rate risk management. The Bank’s ALCO is responsible for making securities portfolio decisions in accordance with established policies. The CFO and Treasurer have the authority to purchase and sell securities within specified guidelines. All transactions for the Bank and for our holding company were reviewed by the ALCO and BOD.

Generally, our investment policy limits new securities investments to the following: securities backed by the full faith and credit of the U.S. government, including U.S. treasury bills, notes, and bonds, direct obligations of Ginnie Mae, USDA and SBA loans; MBS or CMO issued by a GSE, such as Fannie Mae or Freddie Mac; debt securities issued by a GSE, such as Fannie Mae, Freddie Mac, and the FHLB; municipal securities with a rating of “Single-A” or higher; ARPS where the issuing company is rated “BBB” or higher; corporate debt with a rating of “Single-A” or better; investment grade corporate bond mutual funds; private label collateralized mortgage obligations with a single rating of “AA” or higher; commercial mortgage-backed securities with a rating of “AAA”; and mandatory purchases of equity securities of the FRB and FHLB. ARPS holdings are limited to no more than 10% of the Bank’s Common Equity Tier 1; municipal securities are limited to no more than 5% of the Bank's assets; investment grade corporate bond mutual funds are limited to no more than 5% of the Bank's Tier 1 capital; corporate debt holdings are limited to no more than 2.5% of the Bank’s assets; and commercial mortgage-backed securities are limited to an aggregate purchase limit of $50 million.

The Company no longer purchases (although we may continue to hold previously acquired) CDOs. Our policies also govern the use of derivatives, and provide that the Company prudently use derivatives in accordance with applicable regulations as a risk management tool to reduce the overall exposure to interest rate risk, and not for speculative purposes.

As of December 31, 2015, all of our investment securities are classified as AFS or measured at fair value (“trading”) pursuant to ASC Topic 320, Investments and ASC Topic 825, Financial Instruments. AFS securities are reported at fair value in accordance with Topic 820, Fair Value Measurements and Disclosures.

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As of December 31, 2015, the Company had an investment securities portfolio of $1.98 billion, representing approximately 13.9% of our total assets, with the majority of the portfolio invested in AAA/AA+-rated securities. The average duration of our investment securities was 3.3 years as of December 31, 2015.

The following table summarizes the investment securities portfolio as of December 31, 2015 and 2014:

	December 31,
	2015				2014
	Amount		Percent		Amount		Percent
	(dollars in thousands)
Collateralized debt obligations	$	10,060	0.5	%	$	11,445	0.8	%
Commercial MBS issued by GSEs	19,114		1.0		2,147		0.1
Corporate debt securities	13,251		0.7		52,489		3.4
CRA investments	34,685		1.7		24,332		1.6
Municipal obligations	334,830		16.9		299,037		19.6
Mutual funds	—		—		37,702		2.5
Preferred stock	111,236		5.6		82,612		5.4
Private label commercial MBS	4,691		0.2		5,149		0.3
Private label residential MBS	257,128		13.0		70,243		4.6
Residential MBS issued by GSEs	1,171,702		59.0		893,047		58.8
Trust preferred securities	24,314		1.2		25,546		1.7
U.S. government sponsored agency securities	—		—		18,346		1.2
U.S. treasury securities	2,993		0.2		—		—
Total investment securities	$	1,984,004	100.0	%	$	1,522,095	100.0	%

As of December 31, 2015 and 2014, the Company had an investment in BOLI of $162.5 million and $142.0 million, respectively. The BOLI was purchased to help offset employee benefit costs. For additional information concerning investments, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Financial Condition – Investments” in Item 7 of this Form 10-K.

Deposit Products

The Company offers a variety of deposit products, including checking accounts, savings accounts, money market accounts, and other types of deposit accounts, including fixed-rate, fixed maturity certificates of deposit. The Company has historically focused on growing its lower cost core customer deposits. As of December 31, 2015, the deposit portfolio was comprised of 34% non-interest bearing deposits and 66% interest-bearing deposits.

The competition for deposits in our markets is strong. The Company has historically been successful in attracting and retaining deposits due to several factors, including: 1) our high quality of customer service; 2) our experienced relationship bankers who have strong relationships within their communities; 3) the broad selection of cash management services we offer; and 4) incentives to employees for business development and retention. The Company intends to continue its focus on attracting deposits from our business lending relationships in order to maintain our low cost of funds and improve our net interest margin. The loss of low-cost deposits could negatively impact future profitability.

Deposit balances are generally influenced by national and local economic conditions, changes in prevailing interest rates, internal pricing decisions, perceived stability of financial institutions and competition. The Company’s deposits are primarily obtained from communities surrounding its branch offices. In order to attract and retain deposits, we rely on providing quality service and introducing new products and services that meet the needs of our customers.

In 2015, the Bank's deposit rates were determined through an internal oversight process under the direction of its ALCO. The Bank considers a number of factors when determining deposit rates, including:

• current and projected national and local economic conditions and the outlook for interest rates;

• local competition;

• loan and deposit positions and forecasts, including any concentrations in either; and

• FHLB advance rates and rates charged on other funding sources.

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The following table shows our deposit composition: 

	December 31,
	2015				2014
	Amount		Percent		Amount		Percent
	(in thousands)
Non-interest-bearing demand deposits	$	4,093,976	34.0	%	$	2,288,048	25.6	%
Interest checking (NOW)	1,028,073		8.5		854,935		9.6
Savings and money market	5,296,921		44.1		3,869,699		43.3
Certificate of deposit ($250,000 or more)	1,569,525		13.0		1,339,238		15.0
Other time deposits	42,129		0.4		579,123		6.5
Total deposits	$	12,030,624	100.0	%	$	8,931,043	100.0	%

In addition to our deposit base, we have access to other sources of funding, including FHLB and FRB advances, repurchase agreements and unsecured lines of credit with other financial institutions. Previously, we have also accessed the capital markets through trust preferred, subordinated debt, and Senior Note offerings. For additional information concerning our deposits, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Balance Sheet Analysis – Deposits” in Item 7 of this Form 10-K.

Financial Products and Services

In addition to traditional commercial banking activities, the Company offers other financial services to its customers, including: internet banking, wire transfers, electronic bill payment, lock box services, courier, and cash management services.

Customer, Product, and Geographic Concentrations

Approximately 49% and 54% of our loan portfolio at December 31, 2015 and 2014, respectively, consisted of CRE-secured loans, including CRE loans, and construction and land development loans. The Company’s business is concentrated in the Las Vegas, Los Angeles, San Francisco, San Jose, Phoenix, Reno, San Diego and Tucson metropolitan areas. Consequently, the Company is dependent on the trends of these regional economies. The Company is not dependent upon any single or limited number of customers, the loss of which would have a material adverse effect on the Company. No material portion of the Company’s business is seasonal.

Foreign Operations

The Company has no significant foreign operations. We provide loans, letters of credit, foreign exchange, and other trade-related services to commercial enterprises that conduct business outside the U.S.

Customer Concentration

Neither the Company nor any of its reportable segments has any customer relationships that individually account for 10% or more of consolidated or segment revenues, respectively.

Competition

The financial services industry is highly competitive. Many of our competitors are much larger in total assets and capitalization, have greater access to capital markets, and offer a broader range of financial services than we can offer, and may have lower cost structures.

This increasingly competitive environment is primarily a result of long-term changes in regulation that made mergers and geographic expansion easier; changes in technology and product delivery systems and web-based tools; and the accelerating pace of consolidation among financial services providers. We compete for loans, deposits, and customers with other banks, credit unions, brokerage companies, mortgage companies, insurance companies, finance companies, and other non-bank financial services providers. This strong competition for deposit and loan products directly affects the interest rates on those products and the terms on which they are offered to consumers.

Technological innovation continues to contribute to greater competition in domestic and international financial services markets.

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Mergers between financial institutions have placed additional pressure on banks to consolidate their operations, reduce expenses and increase revenues to remain competitive. The competitive environment is also significantly impacted by federal and state legislation that makes it easier for non-bank financial institutions to compete with the Company.

Employees

As of December 31, 2015, the Company had 1,446 full-time equivalent employees. The Company’s employees are not represented by a union or covered by a collective bargaining agreement. Management believes that its employee relations are good.

Recent Developments

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of Common Equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets. In addition, the final rules create a new capital ratio, Common Equity Tier 1. As of December 31, 2015, the Tier 1 capital ratio was 10.2% and the Common Equity Tier 1 ratio was 9.7%.

On September 27, 2011, as part of the U.S. Treasury’s SBLF program, the Company sold $141.0 million of Non-Cumulative Perpetual Preferred Stock, Series B, to the Secretary of the Treasury, with the proceeds used to redeem in full preferred shares previously issued by the Company in 2008 under TARP Capital Purchase Program. The initial dividend rate on the SBLF shares was 5%, subject to downward adjustment based on the Company growth in qualifying small business loans. Due to its rapid success in growing qualifying small business loans, the Company's dividend rate on the SBLF Shares was locked in at 1% (the lowest possible rate) in the first quarter of 2012. The Company redeemed 70,500 SBLF shares on December 19, 2014, at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million. The Company redeemed the remaining 70,500 SBLF shares on December 18, 2015, at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

Supervision and Regulation

The Company and its subsidiaries are extensively regulated and supervised under both federal and state laws. A summary description of the laws and regulations which relate to the Company’s operations are discussed in Item 7 of this Form 10-K.

Additional Available Information

The Company maintains an internet website at http://www.westernalliancebancorp.com. The Company makes available its annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to such reports filed or furnished pursuant to Sections 13(a) and 15(d) of the Exchange Act and other information related to the Company free of charge, through this site as soon as reasonably practicable after it electronically files those documents with, or otherwise furnishes them to the SEC. The SEC maintains an internet site, http://www.sec.gov, in which all forms filed electronically may be accessed. The Company’s internet website and the information contained therein are not intended to be incorporated in this Form 10-K.

In addition, copies of the Company’s annual report will be made available, free of charge, upon written request. 

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Item 1A. Risk Factors.

Investing in the Company’s common stock involves various risks, many of which are specific to the Company’s business. The discussion below addresses the material risks and uncertainties, of which the Company are currently aware, that could have a material adverse effect on the Company’s business, results of operations, and financial condition. Other risks that the Company does not know about now, or that the Company does not currently believe are significant, could negatively impact the Company’s business or the trading price of the Company’s securities. See additional discussions about credit, interest rate, market, and litigation risks in "Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations."

Risks Relating to Our Business

The Company’s financial performance may be adversely affected by conditions in the financial markets and economic conditions generally.

The Company’s financial performance is highly dependent upon the business environment in the markets where the Company operates and in the U.S. as a whole. Unfavorable or uncertain economic and market conditions can be caused by declines in economic growth, business activity, or investor or business confidence, limitations on the availability or increases in the cost of credit and capital, increases in inflation or interest rates, natural disasters, terrorist attacks, acts of war, or a combination of these or other factors. A worsening of business and economic conditions generally or specifically in the principal markets in which the Company conducts business could have adverse effects, including the following:

• a decrease in deposit balances or the demand for loans and other products and services the Company offers;

• an increase in the number of borrowers who become delinquent, file for protection under bankruptcy laws or default on their loans or other obligations to the Company, which could lead to higher levels of nonperforming assets, net charge-offs and provisions for credit losses;

• a decrease in the value of loans and other assets secured by real estate;

• a decrease in net interest income from the Company’s lending and deposit gathering activities;

• an impairment of certain intangible assets such as goodwill; and

• an increase in competition resulting from the increasing consolidation of financial services companies.

In the U.S. financial services industry, the commercial soundness of financial institutions is closely interrelated as a result of credit, trading, clearing or other relationships between the institutions. As a result, concerns about, or a default or threatened default by, one institution could lead to significant market-wide liquidity and credit problems, losses or defaults by other institutions. This is sometimes referred to as “systemic risk” and may adversely affect financial intermediaries, such as clearing agencies, clearing houses, banks, securities firms, and exchanges, with which the Company interacts on a daily basis, and therefore could adversely affect the Company.

It is possible that the business environment in the U.S. will continue to experience volatility for the foreseeable future. There can be no assurance that these conditions will improve in the near term or that conditions will not worsen. Such conditions could adversely affect the Company’s business, results of operations, and financial condition.

The Company is highly dependent on real estate and events that negatively impact the real estate market will hurt the Company’s business and earnings.

The Company is located in areas in which economic growth is largely dependent on the real estate market, and a majority of the Company’s loan portfolio is secured by or otherwise dependent on real estate. A decline in real estate activity, even if less severe than occurred in 2009 and 2008, would likely cause a decline in asset and deposit growth and negatively impact the Company’s earnings and financial condition.

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The Company’s high concentration of CRE, construction and land development, and commercial and industrial loans expose us to increased lending risks.

CRE, construction and land development, and commercial and industrial loans, comprised approximately 96% of our total loan portfolio as of December 31, 2015, exposes the Company to a greater risk of loss than residential real estate and consumer loans, which comprise a much smaller percentage of the total loan portfolio at December 31, 2015. CRE, land development, and commercial and industrial loans typically involve larger loan balances to single borrowers or groups of related borrowers compared to residential loans. Consequently, an adverse development with respect to one commercial loan or one credit relationship exposes us to a significantly greater risk of loss compared to an adverse development with respect to one residential mortgage loan. Much of the growth in the Company's commercial and industrial loan portfolio in recent years is attributable to specialty business lines, such as mortgage warehouse and municipal/non-profit lending, that present unique risks and involve specialized underwriting and management. Likewise, with the Company's recent acquisition of Bridge and related initiatives, the Company now has commercial and industrial credit exposure in niche business sectors that are new to the Company, such as technology and life sciences.

Although its proportion has declined in recent years, real estate construction, acquisition, and development lending continues to represent a significant percentage of the Company's total loan portfolio, and involves certain risks that are not present in other types of loans, including project and market risks. Project risks include cost overruns, borrower credit risk, project completion risk, general contractor credit risk, and environmental and other hazard risks. Market risks include affordability, which means the risk that borrowers cannot obtain affordable financing, product design risk, and risks posed by competing projects. Real estate construction, acquisition, and development loans also involve the disbursement of substantial funds with repayment dependent, in part, on the success of the ultimate project and the ability of the borrower to sell or lease the property, rather than the ability of the borrower or guarantor to repay principal and interest. If the Company's appraisal of the value of the completed project proves to be overstated or market values or rental rates decline, the Company may have inadequate security for the repayment of the loan upon completion of construction of the project.

The Company’s allowance for loan losses may be insufficient, which could require the Company to raise additional capital or otherwise adversely affect the Company’s financial condition and results of operations.

Credit losses are inherent in the business of making loans. We make various assumptions and judgments about the collectability of the Company’s consolidated loan portfolio and maintain an allowance for estimated credit losses based on a number of factors, including the size of the portfolio, asset classifications, economic trends, industry experience and trends, industry and geographic concentrations, estimated collateral values, management’s assessment of the credit risk inherent in the portfolio, historical loan loss experience, and loan underwriting policies. In addition, the Company evaluates all loans identified as problem loans and augments the allowance based upon its estimation of the potential loss associated with those problem loans. Additions to the allowance for credit losses recorded through the Company’s provision for credit losses decreases the Company’s net income. If such assumptions and judgments are incorrect, the Company’s actual credit losses may exceed the Company’s allowance for credit losses.

At December 31, 2015, the Company's allowance for credit losses was $119.1 million. Deterioration in the real estate market and/or general economic conditions could affect the ability of the Company’s loan customers to service their debt, which could result in additional loan provisions and increases in the Company’s allowance for credit losses. In addition, the Company may be required to record additional loan provisions or increase the Company’s allowance for credit losses based on new information regarding existing loans, input from regulators in connection with their review of the Company’s allowance, changes in regulatory guidance, regulations or accounting standards, identification of additional problem loans, and other factors, both within and outside of the Company’s management’s control. Moreover, because future events are uncertain and because the Company may not successfully identify all deteriorating loans in a timely manner, there may be loans that deteriorate in an accelerated time frame.

Any increases in the provision or allowance for credit losses will result in a decrease in the Company’s net income and, potentially, capital, and may have a material adverse effect on the Company’s financial condition and results of operations. If actual credit losses materially exceed the Company’s allowance for credit losses, the Company may be required to raise additional capital, which may not be available to the Company on acceptable terms or at all. The Company’s inability to raise additional capital on acceptable terms when needed could materially and adversely affect the Company’s financial condition, results of operations, and capital.

Because of the geographic concentration of the Company’s assets, changes in local economic conditions could adversely affect the Company’s business and results of operations.

The Company’s business is primarily concentrated in selected markets in Arizona, California, and Nevada. As a result of this geographic concentration, the Company’s financial condition and results of operations depend largely upon economic

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conditions in these market areas. Deterioration in economic conditions in these markets could result in one or more of the following: an increase in loan delinquencies and charge-offs; an increase in problem assets and foreclosures; a decrease in the demand for the Company’s products and services; or a decrease in the value of collateral for loans, especially real estate.

The Company’s financial instruments expose the Company to certain market risks and may increase the volatility of AOCI.

The Company holds certain financial instruments measured at fair value. For those financial instruments measured at fair value, the Company is required to recognize the changes in the fair value of such instruments in AOCI each quarter. Therefore, any increases or decreases in the fair value of these financial instruments have a corresponding impact on reported AOCI. Fair value can be affected by a variety of factors, many of which are beyond the Company’s control, including the Company’s credit position, interest rate volatility, capital markets volatility, and other economic factors. Accordingly, the Company’s earnings are subject to mark-to-market risk and the application of fair value accounting may cause the Company’s AOCI to be more volatile than would be suggested by the Company’s underlying performance.

If the Company loses a significant portion of its core deposits or its cost of funding deposits increases significantly, the Company's liquidity and/or profitability would be adversely impacted.

The Company’s profitability depends in part on successfully attracting and retaining a stable base of relatively low-cost deposits. The competition for these deposits in the Company's markets is strong and customers may demand higher interest rates on their deposits or seek other investments offering higher rates of return. The Company is a member of the Promontory Interfinancial Network, and offers its reciprocal deposit products, such as CDARS and ICS, to customers seeking federal insurance for deposit amounts that exceed the applicable deposit insurance limit at a single institution. The Company also from time to time offers other credit enhancements to depositors, such as FHLB letters of credit and, for certain deposits of public monies, pledges of collateral in the form of readily marketable securities. Any event or circumstance that interferes with or limits the Company's ability to offer these products to customers that require greater security for their deposits, such as a significant regulatory enforcement action or a significant decline in capital levels at the Company's bank subsidiary, could negatively impact the Company's ability to attract and retain deposits. For further discussion of CDARS and ICS, see "Note 8. Deposits" to the Consolidated Financial Statements included in this Form 10-K. If the Company were to lose a significant portion of its low-cost deposits, the Company would be required to borrow from other sources at higher rates and the Company's liquidity and profitability would be adversely impacted.

From time to time, the Company has been dependent on borrowings from the FHLB and the FRB, and there can be no assurance these programs will be available as needed.

As of December 31, 2015, the Company has borrowings from the FHLB of San Francisco of $150.0 million and no borrowings from the FRB. In the past, the Company has been reliant on borrowings from the FHLB of San Francisco and the FRB to satisfy its short-term liquidity needs. The Company’s borrowing capacity is generally dependent on the value of its collateral pledged to these entities. These lenders could reduce the Company’s borrowing capacity or eliminate certain types of collateral and could otherwise modify or even terminate their loan programs. Any change or termination could have an adverse effect on the Company’s liquidity and profitability.

The business may be adversely affected by computer, internet, and telecommunications fraud.

The Company is inherently exposed to operational risk caused by the use of computer, internet, and telecommunications systems. These risks may manifest themselves in the form of theft and other fraudulent activity by employees, customers, other outside entities targeting the Company and/or the Company’s customers that use the Company’s internet banking, electronic banking, or some other form of the Company’s telecommunications systems. Such activity may take many forms, including check fraud, electronic fraud, wire fraud, phishing, and other dishonest acts. In recent periods, there has been a rise in electronic theft and fraudulent activity within the financial services industry, especially in the commercial banking sector, due in part to cyber criminals targeting commercial bank accounts. Consistent with industry trends, the Company has also experienced an increase in attempted electronic fraudulent activity in recent periods.

Although the Company devotes substantial resources to maintaining secure systems and to preventing such incidents, given the increasing sophistication of possible perpetrators, and the growing use of electronic, internet-based, and networked systems to conduct business directly or indirectly with the Company’s clients, fraud losses may occur regardless of the preventative and detection systems in place or if those systems fail or prove to be inadequate.

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A failure in or breach of the Company’s operational or security systems or infrastructure, or those of the Company’s third party vendors and other service providers, including as a result of cyber-attacks, could disrupt the Company’s businesses, result in the disclosure or misuse of confidential or proprietary information, damage the Company’s reputation, increase the Company’s costs, and cause losses.

The Company’s operations rely on the secure processing, storage, and transmission of confidential and other information. Although the Company takes numerous protective measures to maintain the confidentiality, integrity, and availability of the Company’s and its clients’ information across all geographic and product lines, and endeavor to modify these protective measures as circumstances warrant, the nature of the threats continues to evolve. As a result, the Company’s computer systems, software, and networks and those of the Company’s customers and third party vendors may be vulnerable to unauthorized access, loss, or destruction of data (including confidential client information), account takeovers, unavailability of service, computer viruses, or other malicious code, cyber-attacks and other events that could have an adverse security impact and result in significant losses to the Company and/or the its customers. These threats may originate externally from third parties, including foreign governments, organized criminal groups, and other hackers, and outsourced or infrastructure-support providers and application developers, or the threats may originate from within the Company’s organization.

We also face the risk of operational disruption, failure, termination, or capacity constraints of any of the third parties that facilitate the Company’s business activities, including vendors, exchanges, clearing agents, clearing houses, or other financial intermediaries. Such parties could also be the source or cause of an attack on, or breach of, the Company’s operational systems, data or infrastructure. In addition, the Company may be at risk of an operational failure with respect to its clients’ systems. The Company’s risk and exposure to these matters remains heightened because of, among other things, the evolving nature of these threats, the outsourcing of some of the Company’s business operations, and the continued uncertain global economic environment. As cyber threats continue to evolve, the Company may be required to expend significant additional resources to continue to modify or enhance its protective measures or to investigate and remediate any information security vulnerabilities.

The Company maintains insurance policies that it believes provide reasonable coverage at a manageable expense for an institution of the Company’s size and scope with similar technological systems. However, the Company cannot assure that these policies will afford coverage for all possible losses or would be sufficient to cover all financial losses, damages, penalties, including lost revenues, should the Company experience any one or more of the its or a third party’s systems failing or experiencing an attack.

The Company relies on other companies to provide key components of its business infrastructure.

The Company relies on third parties to provide key components for its business operations, such as data processing and storage, recording and monitoring transactions, online banking interfaces and services, internet connections, and network access. While the Company selects these third-party vendors carefully, it does not control their actions. Any problems caused by these third parties, including those resulting from breakdowns or other disruptions in communication services provided by a vendor, failure of a vendor to handle current or higher volumes, cyber-attacks and security breaches at a vendor, failure of a vendor to provide services for any reason, or poor performance of services by a vendor, could adversely affect the Company’s ability to deliver products and services to its customers and otherwise conduct its business. Financial or operational difficulties of a third-party vendor could also hurt the Company’s operations if those difficulties interfere with the vendor's ability to serve the Company. Replacing these third party vendors also could create significant delays and expense that adversely affect the Company’s business and performance.

A change in the Company’s creditworthiness could increase the Company’s cost of funding or adversely affect its liquidity.

Market participants regularly evaluate the Company’s creditworthiness and the creditworthiness of the Company’s long-term debt based on a number of factors, some of which are not entirely within the Company’s control, including the Company’s financial strength and the financial services industry generally. There can be no assurance that the Company's perceived creditworthiness will remain the same. Changes could adversely affect the cost and other terms upon which the Company is able to obtain funding and its access to the capital markets, and could increase the Company’s cost of capital. Likewise, any loss of or decline in the credit rating assigned to WAB could impair its ability to attract deposits or to obtain other funding sources, or increase its cost of funding.

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The Company may not be able to successfully implement its planned system conversion or otherwise keep pace with its growth by improving its controls and processes, and its reporting systems and procedures, which could cause it to experience compliance and operational problems or lose customers, or incur additional expenditures beyond current projections, any one of which could adversely affect the Company’s financial results.

The Company is planning a system conversion for the core banking platform during 2016 with the goal of becoming more efficient and providing better products and services to its customers, thereby strengthening its controls and processes and improving overall results. Successfully implementing this conversion and achieving these goals will require communicating these changes to the Company’s customers in a positive fashion, and integrating the Company’s systems and operating procedures. Moreover, in general, the Company’s future success will depend on the ability of officers and other key employees to continue to implement and improve operational, credit, financial, management and other internal risk controls and processes, and improve reporting systems and procedures, while at the same time maintaining and growing existing businesses and client relationships. The Company may not successfully implement such changes or improvements in an efficient or timely manner, or it may discover deficiencies in its existing systems and controls that adversely affect the Company’s ability to grow its existing businesses and client relationships and could require the Company to incur additional expenditures to expand its administrative and operational infrastructure. If the Company is unable to successfully implement the core banking system conversion or to improve its controls, processes, and reporting systems and procedures, the Company may lose customers, experience compliance and operational problems or incur additional expenditures beyond current projections, any one of which could adversely affect the Company’s financial results.

The Company’s expansion strategy may not prove to be successful and our market value and profitability may suffer.

The Company continually evaluates expansion through acquisitions of banks and other financial businesses, the organization of new banks and the expansion of our existing banks through establishment of new branches. In 2015, we completed the largest bank acquisition in our history, Bridge Capital Holdings. This acquisition was, and any future acquisitions will be, accompanied by the risks commonly encountered in such transactions. These risks include, among other things:

• difficulty of integrating the operations and personnel;

• potential disruption of the Company’s ongoing business;

• failure to retain key personnel at the acquired business;

• inability of the Company’s management to maximize its financial and strategic position by the successful implementation of uniform product offerings and the incorporation of uniform technology into the Company’s product offerings and control systems; and

• failure to realize any expected revenue increases, cost savings, and other projected benefits from an acquisition.

The economic crisis in 2008 also highlighted risks that are unique to acquisitions of financial institutions and banks and that are difficult to assess, including the risk that the acquired institution has troubled, illiquid, or bad assets or an unstable base of deposits or assets under management.

The Company expects that competition for suitable acquisition candidates may be significant. We may compete with other banks or financial service companies with similar acquisition strategies, many of which are larger and have greater financial and other resources. The Company cannot assure that we will be able to successfully identify and acquire suitable acquisition targets on acceptable terms and conditions, or that it will be able to obtain the regulatory approvals needed to complete the transaction.

In addition to the acquisition of existing financial institutions, the Company may consider the organization of new banks in new market areas. Although we do not have any current plans to do so, the organization of a new bank carries with it numerous risks, including the following:

• the inability to obtain any required regulatory approvals;

• significant costs and anticipated operating losses during the application and organizational phases, and the first years of operation of the new bank;

• the inability to secure or retain the services of qualified senior management;

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• the local market may not accept the services of a bank owned and managed by a bank holding company headquartered outside of the market area of the bank;

• the inability to obtain attractive locations within a new market at a reasonable cost; and

• the additional strain on management resources and internal systems and controls.

The Company cannot provide any assurance that it will be successful in overcoming these risks or any other problems encountered in connection with acquisitions or the organization of new banks. Potential regulatory enforcement actions, like a MOU, also may adversely affect our ability to engage in certain expansionary activities. The Company’s inability to provide resources necessary to meet the requirements of any regulatory action or otherwise to overcome these risks could have an adverse effect on the achievement of our business strategy and maintenance of our market value.

The Company’s future success depends on its ability to compete effectively in a highly competitive market.

The Company faces substantial competition in all phases of its operations from a variety of different competitors. The Company’s competitors, including large commercial banks, community banks, thrift institutions, mutual savings banks, credit unions, finance companies, insurance companies, securities dealers, brokers, mortgage bankers, investment advisors, money market mutual funds, and other financial institutions, compete with lending and deposit-gathering services offered by the Company. Increased competition in the Company’s markets may result in reduced loans and deposits or less favorable pricing.

There is competition for financial services in the markets in which the Company conduct its businesses, including from many local commercial banks as well as numerous national and regionally based commercial banks. In particular, the Company has experienced intense price and terms competition in some of the lending lines of business in recent years. Many of these competing institutions have much greater financial and marketing resources than the Company has. Due to their size, larger competitors can achieve economies of scale and may offer a broader range of products and services or more attractive pricing than the Company. Some of the financial services organizations with which the Company competes are not subject to the same degree of regulation as is imposed on bank holding companies and federally insured depository institutions. As a result, these non-bank competitors have certain advantages over the Company in accessing funding and in providing various services.

The banking business in the Company’s primary market areas is very competitive, and the level of competition facing the Company may increase further, which may limit its asset growth and financial results. If the Company is unable to compete effectively, its business and results of operations may be adversely affected.

The Company’s success is dependent upon its ability to recruit and retain qualified employees, especially seasoned relationship bankers.

The Company’s business plan includes and is dependent upon hiring and retaining highly qualified and motivated executives and employees at every level. In particular, the Company’s relative success to date has been partly the result of its management’s ability to identify and retain highly qualified employees with expertise in certain specialty areas or that have long-standing relationships in their communities. These professionals bring with them valuable customer relationships and have been an integral part of the Company’s ability to attract deposits and to expand its market share. From time to time, the Company recruits or utilizes the services of employees who are subject to restrictions on their ability to use confidential information of a prior employer, to freely compete with that employer, or to solicit customers of that employer. If the Company is unable to hire or retain qualified employees, or if new employees are subject to these types of restrictions, it may not be able to successfully execute its business strategy. If the Company or its employee is found to have violated any non-solicitation or other restrictions applicable to the Company or tits employee, the Company or its employee could become subject to litigation or other proceedings.

The Company could be harmed if it loses the services of key members of its senior management team.

The Company believes that its success to date has been substantially dependent on its senior management team, including, but not limited to, Robert Sarver, Chairman and CEO; Dale Gibbons, CFO; Robert R. McAuslan, CCO; John Guedry, Executive Vice President-Southern Nevada Administration; James Lundy, Executive Vice President-Arizona Administration; Daniel Myers, Executive Vice President-Northern California Administration; and Gerald Cady, Executive Vice President-Southern California Administration. The Company also believes that its prospects for success in the future are dependent on retaining its senior management team. In addition to their skills and experience as bankers, these persons provide the Company with extensive community ties upon which the Company’s competitive strategy is based. The Company’s ability to retain these persons may be hindered by the fact that it has not entered into employment agreements with any of them. The loss of the services of any of these persons, particularly Mr. Sarver, could have an adverse effect on the Company’s business if the Company cannot replace them with equally qualified persons who are also familiar with its market areas.

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Mr. Sarver’s involvement in outside business interests requires substantial time and attention and may adversely affect the Company’s ability to achieve its strategic plan.

Mr. Sarver joined the Company in December 2002 and is an integral part of the Company’s business. He has substantial business interests that are unrelated to the Company, including his position as managing partner of the Phoenix Suns National Basketball Association franchise and his recent purchase of a Spanish soccer team, RCD Mallorca Football Club. Mr. Sarver’s other business interests demand significant time commitments, the intensity of which may vary throughout the year. Mr. Sarver’s other commitments may reduce the amount of time he has available to devote to the Company’s business. The Company believes that Mr. Sarver spends the substantial majority of his business time on matters related to the Company. However, a significant reduction in the amount of time Mr. Sarver devotes to the Company’s business may adversely affect its ability to achieve the Company’s strategic plan.

The Company's risk management practices may prove to be inadequate or not fully effective.

The Company's risk management framework seeks to mitigate risk and appropriately balance risk and return. The Company has established policies and procedures intended to identify, monitor, and manage the types of risk to which it is subject, including credit risk, market risk, liquidity risk, operational risk, and reputational risk. A Board level risk committee approves and reviews the Company's risk management policies and oversees operation of our risk management framework. Although the Company has devoted significant resources to developing its risk management policies and procedures and expect to continue to do so in the future, these policies and procedures, as well as the Company's risk management techniques, may not be fully effective. In addition, as regulations and markets in which the Company operates continue to evolve, the Company's risk management framework may not always keep sufficient pace with those changes. If the Company's risk management framework does not effectively identify or mitigate its risks, the Company could suffer unexpected losses and could be materially adversely affected. Management of our risks in some cases depends upon the use of analytical and/or forecasting models. If the models we use to mitigate these risks are inadequate, we may incur increased losses. In addition, there may be risks that exist, or that develop in the future, that we have not appropriately anticipated, identified, or mitigated.

The Company's internal controls and procedures may fail or be circumvented and the accuracy of the Company's judgments and estimates about financial and accounting matters may impact operating results and financial condition.

The Company's management regularly reviews and updates its internal control over financial reporting, disclosure controls and procedures, and corporate governance policies and procedures. Any system of controls and procedures, however well designed and operated, is based in part on certain assumptions and can provide only reasonable, not absolute, assurances that the objectives of the system are met.  Any failure or circumvention of the Company's controls and procedures or failure to comply with regulations related to controls and procedures could result in materially inaccurate reported financial statements and/or have a material adverse effect on our business, results of operations, and financial condition. Similarly, the Company's management makes certain estimates and judgments in preparing the Company's financial statements.  The quality and accuracy of those estimates and judgments will impact the Company's operating results and financial condition. 

There are substantial risks and uncertainties associated with the introduction or expansion of lines of business or new products and services within existing lines of business.

From time to time, the Company may implement new lines of business or offer new products and services within existing lines of business. There are substantial risks and uncertainties associated with these efforts, particularly in instances where the markets are not fully developed. In developing and marketing new lines of business and/or new products and services, the Company may invest significant time and resources. Initial timetables for the introduction and development of new lines of business and/or new products or services may not be achieved and price and profitability targets may not prove attainable. External factors, such as compliance with regulations, competitive alternatives, and shifting market preferences, may also impact the successful implementation of a new line of business or a new product or service. Furthermore, any new line of business and/or new product or service could have a significant impact on the effectiveness of the Company’s system of internal controls. Failure to successfully manage these risks in the development and implementation of new lines of business or new products or services could have a material adverse effect on the Company’s business, results of operations, and financial condition.

If the Company is unable to understand and adapt to technological change, the Company’s business could be adversely affected.

The financial services industry is continually undergoing rapid technological change with frequent introductions of new technology driven products and services. The effective use of technology can increase efficiency and enable financial institutions to better serve customers and to reduce costs. However, some new technologies needed to compete effectively result in incremental operating costs. The Company’s future success depends, in part, upon its ability to address the needs of its

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customers by using technology to provide products and services that will satisfy customer demands, as well as to create additional efficiencies in operations. Many of the Company’s competitors, because of their larger size and available capital, have substantially greater resources to invest in technological improvements. The Company may not be able to effectively implement new technology-driven products and services or be successful in marketing these products and services to its customers. Failure to successfully keep pace with technological change affecting the financial services industry could have a material adverse impact on the Company’s business and, in turn, its financial condition and results of operations.

The markets in which the Company operates are subject to the risk of earthquakes and other natural disasters.

The Company's recent acquisition of Bridge Capital Holdings substantially increased the Company's presence in the State of California, and many of the real and personal properties securing the Company's loans are located in California. California is experiencing a record drought and is prone to earthquakes, brush fires, flooding, and other natural disasters. In addition to possibly sustaining damage to our own properties, if there is a major earthquake, flood, or other natural disaster in California or any of our other markets, the Company faces the risk that many of its borrowers may experience uninsured property losses, or sustained job interruption and/or loss which may materially impair their ability to meet the terms of their loan obligations. Therefore, the continuing drought in California, or an earthquake, flood, pandemic, or other natural disaster or catastrophic event, or a combination of these or other factors, in any of the Company's markets could have a material adverse effect on the Company's business, financial condition, results of operations, and cash flows.

Risks Related to the Banking Industry

The Company operates in a highly regulated environment and the laws and regulations that govern the Company’s operations, corporate governance, executive compensation, and accounting principles, or changes in them, or the Company’s failure to comply with them, may adversely affect the Company.

The Company is subject to extensive regulation, supervision, and legislation that govern almost all aspects of its operations. Intended to protect customers, depositors, and the DIF, these laws and regulations, among other matters, prescribe minimum capital requirements, impose limitations on the business activities in which the Company can engage, limit the dividends or distributions that WAB can pay to the Company or that the Company can pay to its stockholders, restrict the ability of affiliates to guarantee the Company’s debt, impose certain specific accounting requirements on the Company that may be more restrictive and may result in greater or earlier charges to earnings or reductions in the Company’s capital than GAAP, among other things. Compliance with laws and regulations can be difficult and costly, and changes to laws and regulations often impose significant additional compliance costs. Further, an alleged failure by the Company to comply with these laws and regulations, even if the Company acted in good faith or the alleged failure reflects a difference in interpretation, could subject the Company to additional restrictions on its business activities (including mergers, acquisitions, and new branches), fines and other penalties, any of which could adversely affect the Company’s results of operations, capital base, and the price of the Company’s securities. In addition, during 2014, WAB and the Company each increased their respective total consolidated assets above $10 billion, and both became subject to regulations and oversight not applicable before that time. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Supervision and Regulation” included in this Form 10-K for a more detailed summary of the regulations and supervision to which the Company are subject.

Since the recent financial crisis, financial institutions generally have been subjected to increased scrutiny from regulatory authorities. Recent changes to the legal and regulatory framework governing the Company’s operations, including the passage and continued implementation of the Dodd-Frank Act, have drastically revised the laws and regulations under which the Company operate. These changes may result in increased costs of doing business, decreased revenues and net income, and may reduce the Company’s ability to effectively compete in attracting and retaining customers. In general, bank regulators have increased their focus on risk management and consumer compliance, and the Company expects this focus to continue. Additional compliance requirements are likely and can be costly to implement, may require additional compliance personnel and may limit the Company’s ability to offer competitive products to its customers.

The Company is also subject to changes in federal and state law, as well as regulations and governmental policies, income tax laws, and accounting principles. Regulations affecting banks and other financial institutions are undergoing continuous review and frequently change, and the ultimate effect of such changes cannot be predicted. Recent areas of legislative focus include housing finance reform, flood insurance, and cyber security. Regulations and laws may be modified at any time, and new legislation may be enacted that will affect the Company, WAB and the Company’s other subsidiaries. Any changes in any federal and state law, as well as regulations and governmental policies, income tax laws, and accounting principles, could affect the Company in substantial and unpredictable ways, including ways that may adversely affect the Company’s business, financial condition or results of operations. Failure to appropriately comply with any such laws, regulations or principles could result in sanctions by regulatory agencies, civil money penalties or damage to the Company’s reputation, all of which could adversely affect its business, financial condition, or results of operations.

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State and federal banking agencies periodically conduct examinations of the Company’s business, including for compliance with laws and regulations, and the Company’s failure to comply with any supervisory actions to which the Company is or becomes subject as a result of such examinations may adversely affect the Company.

State and federal banking agencies periodically conduct examinations of the Company’s business, including for compliance with laws and regulations. If, as a result of an examination, an agency were to determine that the financial condition, capital resources, asset quality, earnings prospects, management, liquidity, or other aspects of any of the Company’s operations had become unsatisfactory, or that any of the Company’s banks or their management was in violation of any law or regulation, federal banking agencies may take a number of different remedial or enforcement actions it deems appropriate to remedy such a deficiency. These actions include the power to enjoin “unsafe or unsound” practices, to require affirmative actions to correct any conditions resulting from any violation or practice, to issue an administrative order that can be judicially enforced, to direct an increase in the bank’s capital, to restrict the bank’s growth, to assess civil monetary penalties against the bank’s officers or directors, to remove officers and directors and, if the FDIC concludes that such conditions cannot be corrected or there is an imminent risk of loss to depositors, to terminate the bank’s deposit insurance. Under Arizona law, the state banking supervisory authority has many of the same enforcement powers with respect to its state-chartered banks. Finally, the CFPB has the authority to examine the Company and has authority to take enforcement actions, including the issuance of cease-and-desist orders or civil monetary penalties against the Company if it finds that the Company offers consumer financial products and services in violation of federal consumer financial protection laws or in an unfair, deceptive, or abusive manner.

If the Company were unable to comply with regulatory directives in the future, or if the Company were unable to comply with the terms of any future supervisory requirements to which the Company may become subject, then it could become subject to a variety of supervisory actions and orders, including cease and desist orders, prompt corrective actions, MOUs, and/or other regulatory enforcement actions. If the Company’s regulators were to take such supervisory actions, then the Company could, among other things, become subject to greater restrictions on its ability to develop any new business, as well as restrictions on its existing business, and the Company could be required to raise additional capital, dispose of certain assets and liabilities within a prescribed period of time, or both. Failure to implement the measures in the time frames provided, or at all, could result in additional orders or penalties from federal and state regulators, which could result in one or more of the remedial actions described above. In the event WAB was ultimately unable to comply with the terms of a regulatory enforcement action, it could ultimately fail and be placed into receivership by the chartering agency. The terms of any such supervisory action and the consequences associated with any failure to comply therewith could have a material negative effect on the Company’s business, operating flexibility, and financial condition.

Changes in interest rates and increased rate competition could adversely affect the Company’s profitability, business and prospects.

Most of the Company’s assets and liabilities are monetary in nature, which subjects the Company to significant risks from changes in interest rates and can impact the Company’s net income and the valuation of its assets and liabilities. Increases or decreases in prevailing interest rates could have an adverse effect on the Company’s business, asset quality, and prospects. The Company’s operating income and net income depend to a great extent on its net interest margin. Net interest margin is the difference between the interest yields the Company receives on loans, securities, and other earning assets and the interest rates the Company pay on interest bearing deposits, borrowings, and other liabilities. These rates are highly sensitive to many factors beyond the Company’s control, including competition, general economic conditions, and monetary and fiscal policies of various governmental and regulatory authorities, including the FRB. If the rate of interest the Company pay on its interest bearing deposits, borrowings, and other liabilities increases more than the rate of interest the Company receive on loans, securities, and other earning assets increases, the Company’s net interest income, and therefore its earnings, would be adversely affected. The Company’s earnings also could be adversely affected if the rates on the Company’s loans and other investments fall more quickly than those on its deposits and other liabilities. The Company has recently experienced increased competition for loans on the basis of interest rates.

In addition, loan volumes are affected by market interest rates on loans. Rising interest rates generally are associated with a lower volume of loan originations, while lower interest rates are usually associated with higher loan originations. Conversely, in rising interest rate environments, loan repayment rates will decline and in falling interest rate environments, loan repayment rates will increase. The Company cannot guarantee that it will be able to minimize interest rate risk. In addition, an increase in the general level of interest rates may adversely affect the ability of certain borrowers to pay the interest on and principal of their obligations.

Interest rates also affect how much money the Company can lend. When interest rates rise, the cost of borrowing increases. Accordingly, changes in market interest rates could materially and adversely affect the Company’s net interest spread, asset quality, loan origination volume, business, financial condition, results of operations, and cash flows.

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The Company is exposed to risk of environmental liabilities with respect to properties to which the Company obtains title.

Approximately 53% of the Company’s loan portfolio at December 31, 2015 was secured by real estate. In the course of the Company’s business, the Company may foreclose on and take title to real estate, and could be subject to environmental liabilities with respect to these properties. The Company may be held liable to a governmental entity or to third parties for property damage, personal injury, investigation, and clean-up costs incurred by these parties in connection with environmental contamination, or may be required to investigate or clean up hazardous or toxic substances, or chemical releases at a property. The costs associated with investigation or remediation activities could be substantial. In addition, if the Company is the owner or former owner of a contaminated site, the Company may be subject to common law claims by third parties based on damages and costs resulting from environmental contamination emanating from the property. These costs and claims could be substantial and adversely affect the Company’s business and prospects.

Risks Related to our Common Stock

The price of the Company’s common stock has increased substantially in the past several years and may fluctuate significantly in the future, which may make it difficult for you to resell shares of common stock owned by you at times or at prices you find attractive.

The price of the Company’s common stock on New York Stock Exchange constantly changes, and has increased substantially over the past four years. The Company expects that the market price of its common stock will continue to fluctuate and there can be no assurances about the market prices for its common stock.

The Company’s stock price may fluctuate as a result of a variety of factors, many of which are beyond the Company’s control. These factors include:

• sales of the Company’s equity securities;

• the Company’s financial condition, performance, creditworthiness, and prospects;

• quarterly variations in the Company’s operating results or the quality of its assets;

• operating results that vary from the expectations of management, securities analysts, and investors;

• changes in expectations as to the Company’s future financial performance;

• announcements of strategic developments, acquisitions, and other material events by the Company or its competitors;

• the operating and securities price performance of other companies that investors believe are comparable to the Company;

• the credit, mortgage, and housing markets, the markets for securities relating to mortgages or housing, and developments with respect to financial institutions generally;

• changes in global financial markets and global economies and general market conditions, such as interest or foreign exchange rates, stock, commodity or real estate valuations or volatility and other geopolitical, regulatory or judicial events; and

• the Company’s past and future dividend practices.

There may be future sales or other dilution of the Company’s equity, which may adversely affect the market price of the Company’s common stock.

The Company is not restricted from issuing additional common stock, including any securities that are convertible into or exchangeable for, or that represent the right to receive, common stock. The Company also grants a significant number of shares of common stock to employees and directors under the Company’s Incentive Plan each year. The issuance of any additional shares of the Company’s common stock or preferred stock or securities convertible into, exchangeable for or that represent the right to receive common stock, or the exercise of such securities could be substantially dilutive to stockholders of the Company’s common stock. Holders of the Company’s common stock have no preemptive rights that entitle such holders to purchase their pro rata share of any offering of shares of any class or series. Because the Company’s decision to issue securities in any future offering will depend on market conditions, its acquisition activity and other factors, the Company cannot predict or estimate the amount, timing, or nature of its future offerings. Thus, the Company’s stockholders bear the risk of the Company’s future offerings reducing the market price of the Company’s common stock and diluting their stock holdings in the Company.

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Offerings of debt, which would be senior to the Company’s common stock upon liquidation, and/or preferred equity securities which may be senior to the Company’s common stock for purposes of dividend distributions or upon liquidation, may adversely affect the market price of the Company’s common stock.

The Company may from time to time issue debt securities, borrow money through other means, or issue preferred stock. From time to time the Company borrows money from the FRB, the FHLB, other financial institutions, and other lenders. In June 2015, WAB issued $150,000,000 aggregate principal amount of 5.00% Fixed-to-Floating Rate Subordinated Notes due July 15, 2025. All of these securities or borrowings have priority over the common stock in a liquidation, which could affect the market price of the Company’s stock.

The Company’s BOD is authorized to issue one or more classes or series of preferred stock from time to time without any action on the part of the stockholders. The Company’s BOD also has the power, without stockholder approval, to set the terms of any such classes or series of preferred stock that may be issued, including voting rights, dividend rights, and preferences over the Company’s common stock with respect to dividends or upon the Company’s dissolution, winding-up, and liquidation and other terms. If the Company issues preferred stock in the future that has a preference over its common stock, with respect to the payment of dividends or upon the Company’s liquidation, dissolution, or winding up, or if the Company issues preferred stock with voting rights that dilute the voting power of its common stock, the rights of holders of its common stock, the market price of its common stock could be adversely affected.

Anti-takeover provisions could negatively impact the Company’s stockholders.

Provisions of Delaware law and provisions of the Company’s Certificate of Incorporation, as amended, and its Amended and Restated Bylaws could make it more difficult for a third party to acquire control of the Company or have the effect of discouraging a third party from attempting to acquire control of the Company. Additionally, the Company’s Certificate of Incorporation, as amended, authorizes the Company’s BOD to issue additional series of preferred stock and such preferred stock could be issued as a defensive measure in response to a takeover proposal. These provisions could make it more difficult for a third party to acquire the Company even if an acquisition might be in the best interest of the Company’s stockholders.

Item 1B. Unresolved Staff Comments

None.

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Item 2. Properties

At December 31, 2015, the Company and WAB are headquartered at One E. Washington Street in Phoenix, Arizona. WAB operates 40 domestic branch locations, 18 of which are owned and 22 are leased, and 7 loan production offices. In addition, WAB owns and occupies a 36,000 square foot operations facility in Las Vegas, Nevada, and has seven executive and administrative facilities, two of which are owned. See "Item 1. Business” for location cities. For information regarding rental payments, see "Note 5. Premises and Equipment" of the Consolidated Financial Statements included in this Form 10-K.

The Company continually evaluates the suitability and adequacy of its offices. Management believes that the existing facilities are adequate for present and anticipated future use.

Item 3. Legal Proceedings

There are no material pending legal proceedings to which the Company is a party or to which any of our properties are subject. There are no material proceedings known to us to be contemplated by any governmental authority. See the “Supervision and Regulation” section of "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" of this Form 10-K for additional information. From time to time, we are involved in a variety of litigation matters in the ordinary course of our business and anticipate that we will become involved in new litigation matters in the future.

Item 4. Mine Safety Disclosures

Not applicable.

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PART II

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market Information

The Company’s common stock began trading on the New York Stock Exchange under the symbol “WAL” on June 30, 2005. The Company has filed, without qualifications, its 2015 Domestic Company Section 303A CEO Certification regarding its compliance with the NYSE’s corporate governance listing standards. The following table presents the high and low sales prices of the Company’s common stock for each quarterly period for the last two years as reported by The NASDAQ Global Select Market: 

	2015 Quarters								2014 Quarters
	Fourth		Third		Second		First		Fourth		Third		Second		First
Range of stock prices:
High	$	39.11	$	35.17	$	34.95	$	30.41	$	28.31	$	25.21	$	25.75	$	25.72
Low	29.12		28.42		28.91		24.52		21.43		22.01		20.76		20.56

Holders

At December 31, 2015, there were approximately 1,439 stockholders of record. This number does not include stockholders who hold shares in the name of brokerage firms or other financial institutions. The Company is not provided the exact number of or identities of these stockholders. There are no other classes of common equity outstanding.

Dividends

WAL is a legal entity separate and distinct from WAB and LVSP. As a holding company with limited significant assets other than the capital stock of our subsidiaries, WAL's ability to pay dividends depends primarily upon the receipt of dividends or other capital distributions from our subsidiaries. Our subsidiaries’ ability to pay dividends to WAL is subject to, among other things, their individual earnings, financial condition, and need for funds, as well as federal and state governmental policies and regulations applicable to WAL and each of those subsidiaries, which limit the amount that may be paid as dividends without prior approval. See the additional discussion in the “Supervision and Regulation” section of this report for information regarding restrictions on the ability to pay cash dividends. In addition, the terms and conditions of other securities we issue may restrict our ability to pay dividends to holders of our common stock. For example, if any required payments on outstanding trust preferred securities are not made, WAL would be prohibited from paying cash dividends on our common stock. WAL has never paid a cash dividend on its common stock and does not anticipate paying any cash dividends in the foreseeable future.

Sale of Unregistered Securities

None.

Share Repurchases

There were no shares repurchased during 2015 or 2014.

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Performance Graph

The following graph summarizes a five year comparison of the cumulative total returns for the Company’s common stock, the Standard & Poor’s 500 stock index and the KBW Regional Banking Total Return Index, each of which assumes an initial value of $100.00 on December 31, 2010 and reinvestment of dividends.

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Item 6. Selected Financial Data.

The following selected financial data have been derived from the Company’s consolidated financial condition and results of operations, as of and for the years ended December 31, 2015, 2014, 2013, 2012, and 2011, and should be read in conjunction with the Consolidated Financial Statements and the related notes included elsewhere in this report: 

	Year Ended December 31,
	2015		2014			2013			2012			2011
	(in thousands, except per share data)
Results of Operations:
Interest income	$	525,144	$	416,379		$	362,655		$	318,295		$	296,591
Interest expense	32,568		31,486			29,760			28,032			38,923
Net interest income	492,576		384,893			332,895			290,263			257,668
Provision for credit losses	3,200		4,726			13,220			46,844			46,188
Net interest income after provision for credit losses	489,376		380,167			319,675			243,419			211,480
Non-interest income	29,768		24,651			22,197			46,505			34,457
Non-interest expense	260,606		207,319			196,216			188,860			195,598
Income from continuing operations before provision for income taxes	258,538		197,499			145,656			101,064			50,339
Income tax expense	64,294		48,390			29,830			25,935			16,849
Income from continuing operations	194,244		149,109			115,826			75,129			33,490
Loss from discontinued operations, net of tax	—		(1,158		)	(861		)	(2,490		)	(1,996		)
Net income	$	194,244	$	147,951		$	114,965		$	72,639		$	31,494

The Company adopted the amended guidance in ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, beginning on January 1, 2014. As a result, prior period financial information has been adjusted to conform to the amended guidance.

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. As a result, Bridge’s results of operations have been included in the Company’s results beginning July 1, 2015. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the impact that the acquisition had on the Company's Consolidated Financial Statements.

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	Year Ended December 31,
	2015			2014			2013			2012			2011
	(in thousands, except per share data)
Per Share Data:
Earnings per share available to common stockholders - basic	$	2.05		$	1.69		$	1.33		$	0.84		$	0.19
Earnings per share available to common stockholders - diluted	2.03			1.67			1.31			0.83			0.19
Earnings per share from continuing operations - basic	2.05			1.70			1.34			0.87			0.21
Earnings per share from continuing operations - diluted	2.03			1.69			1.32			0.86			0.21
Book value per common share	15.44			10.49			8.20			7.15			6.02
Shares outstanding at period end	103,087			88,691			87,186			86,465			82,362
Weighted average shares outstanding - basic	94,570			86,693			85,682			82,285			80,909
Weighted average shares outstanding - diluted	95,219			87,506			86,541			82,912			81,183
Selected Balance Sheet Data:
Cash and cash equivalents	$	224,640		$	164,396		$	305,514		$	204,625		$	154,995
Investment securities and other	1,984,126			1,522,546			1,659,370			1,236,648			1,490,501
Loans, net of deferred loan fees and costs	11,136,663			8,398,265			6,801,415			5,709,318			4,780,069
Allowance for credit losses	119,068			110,216			100,050			95,427			99,170
Total assets	14,275,089			10,600,498			9,307,342			7,622,442			6,844,541
Total deposits	12,030,624			8,931,043			7,838,205			6,455,177			5,658,512
Other borrowings	150,000			390,263			341,096			193,717			353,321
Qualifying debt	210,328			40,437			41,858			36,218			36,985
Total stockholders' equity	1,591,502			1,000,928			855,498			759,421			636,683
Selected Other Balance Sheet Data:
Average assets	$	12,420,803		$	9,891,109		$	8,500,324		$	7,193,425		$	6,486,396
Average earning assets	11,621,977			9,270,465			7,887,584			6,685,107			5,964,056
Average stockholders' equity	1,323,952			964,131			798,497			691,004			631,361
Selected Financial and Liquidity Ratios:
Return on average assets	1.56		%	1.50		%	1.35		%	1.01		%	0.49		%
Return on average tangible common equity	17.83			18.52			18.28			13.97			6.89
Net interest margin	4.51			4.42			4.39			4.49			4.37
Loan to deposit ratio	92.57			94.04			86.77			88.45			84.48
Capital Ratios:
Leverage ratio	9.8		%	9.7		%	9.8		%	10.1		%	9.8		%
Tier 1 risk-based capital ratio	10.2			10.5			11.1			11.3			11.3
Total risk-based capital ratio	12.2			11.7			12.4			12.6			12.6
Average equity to average assets	10.7			9.7			9.4			9.6			9.7
Selected Asset Quality Ratios:
Non-accrual loans to gross loans	0.44		%	0.81		%	1.11		%	1.83		%	1.89		%
Non-accrual loans and repossessed assets to total assets	0.65			1.18			1.53			2.39			2.62
Loans past due 90 days or more and still accruing to total loans	0.03			0.06			0.02			0.02			0.05
Allowance for credit losses to total loans	1.07			1.31			1.47			1.67			2.07
Allowance for credit losses to non-accrual loans	246.10			162.90			132.20			91.13			109.71
Net (recoveries) charge-offs to average loans	(0.06		)	(0.07		)	0.14			0.99			1.32

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Item 7. Management's Discussions and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis should be read in conjunction with “Item 8. Financial Statements and Supplementary Data.” This discussion and analysis contains forward-looking statements that involve risk, uncertainties, and assumptions. Certain risks, uncertainties, and other factors, including, but not limited to, those set forth under “Cautionary Note Regarding Forward-Looking Statements” at the beginning of this Form 10-K, may cause actual results to differ materially from those projected in the forward-looking statements.

Financial Overview and Highlights

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the previously existing WAB northern California offices are operating as a combined division, with their results reported under the Company's Northern California operating segment.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Financial Result Highlights of 2015

• Net income available to common stockholders of $193.5 million for 2015, compared to $146.6 million for 2014

• Diluted earnings per share of $2.03 for 2015, and $1.67 per share for 2014

• Pre-tax, pre-provision operating earnings increased$72.3 million to $267.9 million, compared to $195.6 million in 2014¹

• Net operating revenue of $521.8 million, constituting year-over-year growth of 27.9%, or $113.7 million, compared to an increase in operating expenses of 19.5%, or $41.4 million¹

• Net interest margin of 4.51% in 2015, compared to 4.42% in 2014

• Efficiency ratio of 45.8% in 2015, compared to 49.1% in 2014¹ 

• Total loans of $11.14 billion, up $2.74 billion from December 31, 2014

• Total deposits of $12.03 billion, up $3.10 billion from December 31, 2014

• Nonperforming assets (nonaccrual loans and repossessed assets) decreased to 0.65% of total assets, from 1.18% at December 31, 2014

• Net loan recoveries to average loans outstanding of 0.06%, compared to 0.07% at December 31, 2014

• Tangible common equity ratio of 9.2%, compared to 8.6% at December 31, 2014¹

• Stockholders' equity of $1.59 billion, an increase of $590.6 million from December 31, 2014

• Tangible book value per share, net of tax, of $12.54, an increase of 22.8% from $10.21 at December 31, 2014¹

The impact to the Company from these items, and others of both a positive and negative nature, are discussed in more detail below as they pertain to the Company’s overall comparative performance for the year ended December 31, 2015. As a bank holding company, management focuses on key ratios in evaluating the Company's financial condition and results of operations.

¹ See Non-GAAP Financial Measures section beginning on page 33.

29

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of WAL's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations have been included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $8.8 million for the year ended December 31, 2015, have been included in non-interest expense, of which approximately $0.9 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability.

The following table shows the recognized amounts of identifiable assets acquired and liabilities assumed at their as adjusted acquisition date fair values, which include all measurement period adjustments identified and recognized during the last six months of 2015:

	As Adjusted
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,299
Investments in restricted stock	7,015
Loans	1,439,930
Premises and equipment	1,519
Other assets acquired through foreclosure	1,407
Bank owned life insurance	17,385
Investment in LIHTC	5,354
Intangible assets	14,997
Deferred tax assets, net	18,287
Other assets	19,993
Total assets	$	1,966,152
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	11,678
Total liabilities	1,764,996
Net assets acquired	$	201,156
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	266,413

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

The Company identified $6.8 million in measurement period adjustments since June 30, 2015, which have been reflected as an adjustment to increase goodwill. Due to early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments, as discussed in "Note 1. Summary of Significant Accounting Policies" to the Consolidated Financial Statements, these adjustments to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined, rather than retrospectively adjusting the

30

provisional amounts at the acquisition date. Any effects on earnings from changes in the provisional amounts have been appropriately reflected in the Consolidated Income Statement for the year ended December 31, 2015. The significant measurement period adjustments relate to loans, net deferred tax assets, and other liabilities. The fair value of loans decreased as there were further adjustments made to the interest and credit marks on Bridge loans. The net deferred tax assets balance was adjusted to account for the tax effects of all the changes in the fair values of assets acquired and liabilities assumed. Other liabilities also increased to accrue for unrecorded expenses and other liabilities incurred prior to acquisition. Although further measurement period adjustments are not expected to be significant, the estimated fair value of tax related items and other liabilities are still preliminary and are subject to additional measurement period adjustments.

Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $26.0 million. The fair value of PCI loans totals $10.9 million, which is net of interest and credit marks of $5.7 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" to the Consolidated Financial Statements for additional detail of the acquired loans.

In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill related to the acquisition totaled $266.4 million, which includes $6.8 million of measurement period adjustments identified and recognized since June 30, 2015. Goodwill has been allocated to the Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015. Management believes this methodology allocates goodwill to the reporting units in a manner consistent with the expected synergies of the combination. None of the goodwill recognized as part of the acquisition is expected to be deductible for income tax purposes.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be accreted over the remaining life of the trusts. See "Note 10. Qualifying Debt" to the Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge officers based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the officer's service is terminated by Bridge or by the officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the officer's attainment of age 55 or, if the officer is already age 55 as of such termination of employment, on the first business day of January of the year following the officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and an employee compensation rate increase of 4.00% were used in determining the SERP liability as of June 30, 2015.

31

Results of Operations and Financial Condition

A summary of our results of operations, financial condition, and select metrics are included in the following tables: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands, except per share amounts)
Net income available to common stockholders	$	193,494		$	146,564		$	113,555
Earnings per share applicable to common stockholders - basic	2.05			1.69			1.33
Earnings per share applicable to common stockholders - diluted	2.03			1.67			1.31
Net interest margin	4.51		%	4.42		%	4.39		%
Return on average assets	1.56			1.50			1.35
Return on average tangible common equity	17.83			18.52			18.28

	December 31,
	2015		2014
	(in thousands)
Total assets	$	14,275,089	$	10,600,498
Loans, net of deferred loan fees and costs	11,136,663		8,398,265
Total deposits	12,030,624		8,931,043

Asset Quality

For all banks and bank holding companies, asset quality plays a significant role in the overall financial condition of the institution and results of operations. The Company measures asset quality in terms of non-accrual loans as a percentage of gross loans and net charge-offs as a percentage of average loans. Net charge-offs are calculated as the difference between charged-off loans and recovery payments received on previously charged-off loans. The following table summarizes asset quality metrics: 

	At or for the Year Ended December 31,
	2015			2014			2013
	(in thousands)
Non-accrual loans	$	48,381		$	67,659		$	75,680
Non-performing assets	166,058			214,661			233,509
Non-accrual loans to gross loans	0.44		%	0.81		%	1.11		%
Net (recoveries) charge-offs to average loans	(0.06		)%	(0.07		)%	0.14		%

Asset and Deposit Growth

The Company’s assets and liabilities are comprised primarily of loans and deposits. Therefore, the ability to originate new loans and attract new deposits is fundamental to the Company’s growth. Total assets increased to $14.28 billion at December 31, 2015 from $10.60 billion at December 31, 2014. Total loans, including HFS loans, increased by $2.74 billion, or 32.6%, to $11.14 billion as of December 31, 2015, compared to $8.40 billion as of December 31, 2014. Total deposits increased $3.10 billion, or 34.7%, to $12.03 billion as of December 31, 2015 from $8.93 billion as of December 31, 2014. The growth in total assets, loans, and deposits related to the acquisition of Bridge was $2.23 billion, $1.44 billion, and $1.74 billion, respectively.

32

RESULTS OF OPERATIONS

The following table sets forth a summary financial overview for the comparable periods:  

	Year Ended December 31,					Increase			Year Ended December 31,						Increase
	2015		2014			(Decrease)			2014			2013			(Decrease)
	(in thousands, except per share amounts)
Consolidated Income Statement Data:
Interest income	$	525,144	$	416,379		$	108,765		$	416,379		$	362,655		$	53,724
Interest expense	32,568		31,486			1,082			31,486			29,760			1,726
Net interest income	492,576		384,893			107,683			384,893			332,895			51,998
Provision for credit losses	3,200		4,726			(1,526		)	4,726			13,220			(8,494		)
Net interest income after provision for credit losses	489,376		380,167			109,209			380,167			319,675			60,492
Non-interest income	29,768		24,651			5,117			24,651			22,197			2,454
Non-interest expense	260,606		207,319			53,287			207,319			196,216			11,103
Income from continuing operations before income taxes	258,538		197,499			61,039			197,499			145,656			51,843
Income tax expense	64,294		48,390			15,904			48,390			29,830			18,560
Income from continuing operations	194,244		149,109			45,135			149,109			115,826			33,283
Loss from discontinued operations, net of tax	—		(1,158		)	1,158			(1,158		)	(861		)	(297		)
Net income	$	194,244	$	147,951		$	46,293		$	147,951		$	114,965		$	32,986
Net income available to common stockholders	$	193,494	$	146,564		$	46,930		$	146,564		$	113,555		$	33,009
Earnings per share applicable to common stockholders - basic	$	2.05	$	1.69		$	0.36		$	1.69		$	1.33		$	0.36
Earnings per share applicable to common stockholders - diluted	$	2.03	$	1.67		$	0.36		$	1.67		$	1.31		$	0.36

Non-GAAP Financial Measures

The following discussion and analysis contains financial information determined by methods other than those prescribed by GAAP. The Company's management uses these non-GAAP financial measures in their analysis of the Company's performance. These measurements typically adjust GAAP performance measures to exclude the effects of unrealized gains or losses on assets and liabilities measured at fair value as well as other items to adjust income available to common stockholders for certain significant activities or transactions that, in management's opinion, do not reflect recurring period-to-period comparisons of the Company's performance. Management believes presentation of these non-GAAP financial measures provides useful supplemental information that is essential to a complete understanding of the operating results of the Company's core businesses. Since the presentation of these non-GAAP performance measures and their impact differ between companies, these non-GAAP disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies.

Pre-Tax, Pre-Provision Operating Earnings

Pre-tax, pre-provision operating earnings adjust the level of earnings to exclude the impact of income taxes, provision for credit losses, and non-recurring or other items not considered part of the Company's core operations. Management believes that eliminating the effects of these items makes it easier to analyze underlying performance trends and enables investors to assess the Company's earnings power and ability to generate capital to cover credit losses.

33

The following table shows the components of pre-tax, pre-provision operating earnings for the years ended December 31, 2015, 2014, and 2013:

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Total non-interest income	$	29,768		$	24,651		$	22,197
Less:
Gain (loss) on sales of investment securities, net	615			757			(1,195		)
Unrealized gains (losses) on assets and liabilities measured at fair value, net	47			1,212			(6,483		)
(Loss) on extinguishment of debt	(81		)	(502		)	(1,387		)
Bargain purchase gain from acquisition	—			—			10,044
Legal settlement	—			—			38
Total operating non-interest income	29,187			23,184			21,180
Plus: net interest income	492,576			384,893			332,895
Net operating revenue	$	521,763		$	408,077		$	354,075
Total non-interest expense	$	260,606		$	207,319		$	196,216
Less:
Net (gain) on sales / valuations of repossessed and other assets	(2,070		)	(5,350		)	(2,387		)
Acquisition / restructure expense	8,836			198			5,752
Total operating non-interest expense	$	253,840		$	212,471		$	192,851
Pre-tax, pre-provision operating earnings	$	267,923		$	195,606		$	161,224

Tangible Common Equity

The following table presents financial measures related to tangible common equity. Tangible common equity represents total stockholders' equity less identifiable intangible assets, goodwill, and preferred stock. Management believes that tangible common equity financial measures are useful in evaluating the Company's capital strength, financial condition, and ability to manage potential losses. In addition, management believes that these measures improve comparability to other institutions that have not engaged in acquisitions that resulted in recorded goodwill and other intangible assets.

	December 31,
	2015			2014
	(dollars and shares in thousands)
Total stockholders' equity	$	1,591,502		$	1,000,928
Less: goodwill and intangible assets	305,354			25,913
Total tangible stockholders' equity	1,286,148			975,015
Less: preferred stock	—			70,500
Total tangible common equity	1,286,148			904,515
Plus: deferred tax - attributed to intangible assets	6,093			1,006
Total tangible common equity, net of tax	$	1,292,241		$	905,521
Total assets	$	14,275,089		$	10,600,498
Less: goodwill and intangible assets, net	305,354			25,913
Tangible assets	13,969,735			10,574,585
Plus: deferred tax - attributed to intangible assets	6,093			1,006
Total tangible assets, net of tax	$	13,975,828		$	10,575,591
Tangible equity ratio	9.2		%	9.2		%
Tangible common equity ratio	9.2			8.6
Common shares outstanding	103,087			88,691
Tangible book value per share, net of tax	$	12.54		$	10.21

34

Efficiency Ratio

The following table shows the components used in the calculation of the efficiency ratio, which management uses as a metric for assessing cost efficiency:

	Year Ended December 31,
	2015			2014			2013
	(dollars in thousands)
Total operating non-interest expense	$	253,840		$	212,471		$	192,851
Divided by:
Total net interest income	$	492,576		$	384,893		$	332,895
Plus:
Tax equivalent interest adjustment	31,883			24,571			13,312
Operating non-interest income	29,187			23,184			21,180
Net operating revenue - TEB	$	553,646		$	432,648		$	367,387
Efficiency ratio - TEB	45.8		%	49.1		%	52.5		%

Adjusted Allowance for Credit Losses

The adjusted allowance for credit losses to gross loans ratio includes an adjustment for the remaining credit marks on acquired performing and PCI loans. Under GAAP, the allowance for credit losses on acquired loans is not carried over in an acquisition as acquired loans are recorded at fair value, net of related interest rate and credit marks, which discounts the loans based on expected future cash flows. The credit marks on acquired loans represent the allowance for credit losses carried over to the Company. Therefore, by adding back the remaining credit marks on acquired loans, management believes this is more indicative of the allowance available for inherent losses in the loan portfolio.

	December 31,
	2015			2014
	(dollars in thousands)
Allowance for credit losses	$	119,068		$	110,216
Plus: remaining credit marks
Acquired performing loans	12,154			2,335
Purchased credit impaired loans	8,491			9,279
Adjusted allowance for credit losses	$	139,713		$	121,830
Gross loans held for investment and deferred fees, net	$	11,112,854		$	8,398,265
Plus: remaining credit marks
Acquired performing loans	12,154			2,335
Purchased credit impaired loans	8,491			9,279
Adjusted loans, net of deferred fees and costs	$	11,133,499		$	8,409,879
Allowance for credit losses to gross loans	1.07		%	1.31		%
Allowance for credit losses to gross loans, adjusted for acquisition accounting	1.25			1.45

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Regulatory Capital

The following table presents certain financial measures related to regulatory capital under Basel III, which includes Common Equity Tier 1 and total capital. The FRB and other banking regulators use Common Equity Tier 1 and total capital as a basis for assessing a bank's capital adequacy; therefore, management believes it is useful to assess financial condition and capital adequacy using this same basis. Specifically, the total capital ratio takes into consideration the risk levels of assets and off-balance sheet financial instruments. In addition, management believes that the classified assets to Common Equity Tier 1 plus allowance measure is an important regulatory metric for assessing asset quality.

	Basel III
	December 31, 2015
	(dollars in thousands)
Common Equity Tier 1:
Common Equity	$	1,591,502
Less:
Non-qualifying goodwill and intangibles	293,487
Disallowed unrealized losses on equity securities	—
Disallowed deferred tax asset	5,001
AOCI related adjustments	10,228
Unrealized gain on changes in fair value liabilities	6,309
Common Equity Tier 1 (regulatory)	$	1,276,477
Divided by: Risk-weighted assets (regulatory)	$	13,193,563
Common Equity Tier 1 ratio	9.7		%
Common Equity Tier 1 (regulatory)	$	1,276,477
Plus:
Trust preferred securities	81,500
Preferred stock	—
Less:
Disallowed deferred tax asset	7,502
Unrealized gain on changes in fair value liabilities	9,464
Tier 1 capital	$	1,341,011
Total Capital:
Tier 1 capital (regulatory)	$	1,341,011
Plus:
Subordinated debt	140,097
Qualifying allowance for credit losses	119,068
Other	3,296
Less: Tier 2 qualifying capital deductions	—
Tier 2 capital	$	262,461
Total capital	$	1,603,472
Total capital ratio	12.2		%
Classified assets to Common Equity Tier 1 plus allowance for credit losses:
Classified assets	$	221,126
Divided by:
Common Equity Tier 1 (regulatory)	1,276,477
Plus: Allowance for credit losses	119,068
Total Common Equity Tier 1 plus allowance for credit losses	$	1,395,545
Classified assets to Common Equity Tier 1 plus allowance	16		%

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Net Interest Margin

The net interest margin is reported on a TEB. A tax equivalent adjustment is added to reflect interest earned on certain municipal securities and loans that are exempt from federal income tax. The following tables set forth the average balances, interest income, interest expense, and average yield (on a fully TEB) for the periods indicated:

	Year Ended December 31,
	2015							2014
	Average Balance			Interest		Average Yield / Cost		Average Balance			Interest		Average Yield / Cost
	(dollars in thousands)
Interest earning assets
Loans (1), (2), (3)	$	9,674,234		$	476,417	5.18	%	$	7,432,087		$	370,922	5.23	%
Securities - taxable (1)	1,268,755			28,525		2.25		1,191,305			27,903		2.34
Securities - tax-exempt	407,012			15,032		5.41		416,404			15,306		5.28
Total securities	1,675,767			43,557		3.02		1,607,709			43,209		3.10
Other	271,976			5,170		1.90		230,669			2,248		0.97
Total interest earnings assets	11,621,977			525,144		4.79		9,270,465			416,379		4.76
Non-interest earning assets
Cash and due from banks	137,923							133,739
Allowance for credit losses	(115,033		)					(106,100		)
Bank owned life insurance	152,288							141,885
Other assets	623,648							451,120
Total assets	$	12,420,803						$	9,891,109
Interest-bearing liabilities
Interest-bearing deposits:
Interest bearing transaction accounts	$	983,889		$	1,736	0.18	%	$	793,118		$	1,522	0.19	%
Savings and money market	4,470,189			12,544		0.28		3,616,829			10,852		0.30
Time certificates of deposits	1,808,120			7,515		0.42		1,758,342			7,638		0.43
Total interest-bearing deposits	7,262,198			21,795		0.30		6,168,289			20,012		0.32
Short-term borrowings	185,173			4,965		2.68		173,228			2,336		1.35
Long-term debt	76,655			801		1.04		265,828			7,384		2.78
Qualifying debt	120,191			5,007		4.17		42,297			1,754		4.15
Total interest-bearing liabilities	7,644,217			32,568		0.43		6,649,642			31,486		0.47
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	3,273,138							2,153,686
Other liabilities	179,496							123,650
Stockholders’ equity	1,323,952							964,131
Total liabilities and stockholders' equity	$	12,420,803						$	9,891,109
Net interest income and margin (4)				$	492,576	4.51	%				$	384,893	4.42	%
Net interest spread (5)						4.36	%						4.29	%

(1) Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $31.9 million and $24.6 million for 2015 and 2014, respectively.

(2) Net loan fees of $28.1 million and $18.7 million are included in the yield computation for 2015 and 2014, respectively.

(3) Includes non-accrual loans.

(4) Net interest margin is computed by dividing net interest income by total average earning assets.

(5) Net interest spread represents average yield earned on interest-earning assets less the average rate paid on interest bearing liabilities.

37

	Year Ended December 31,
	2014							2013
	Average Balance			Interest		Average Yield / Cost		Average Balance			Interest		Average Yield / Cost
	(dollars in thousands)
Interest earning assets
Loans (1), (2), (3)	$	7,432,087		$	370,922	5.23	%	$	6,136,217		$	326,714	5.43	%
Securities - taxable (1)	1,191,305			27,903		2.34		885,730			20,752		2.34
Securities - tax-exempt	416,404			15,306		5.28		456,229			13,651		4.47
Total securities	1,607,709			43,209		3.10		1,341,959			34,403		3.07
Other	230,669			2,248		0.97		409,408			1,538		0.38
Total interest earnings assets	9,270,465			416,379		4.76		7,887,584			362,655		4.77
Non-interest earning assets
Cash and due from banks	133,739							128,481
Allowance for credit losses	(106,100		)					(97,537		)
Bank owned life insurance	141,885							139,754
Other assets	451,120							442,042
Total assets	$	9,891,109						$	8,500,324
Interest-bearing liabilities
Interest-bearing deposits:
Interest bearing transaction accounts	$	793,118		$	1,522	0.19	%	$	640,062		$	1,334	0.21	%
Savings and money market	3,616,829			10,852		0.30		2,936,122			8,553		0.29
Time certificates of deposits	1,758,342			7,638		0.43		1,488,017			6,448		0.43
Total interest-bearing deposits	6,168,289			20,012		0.32		5,064,201			16,335		0.32
Short-term borrowings	173,228			2,336		1.35		202,755			1,279		0.63
Long-term debt	265,828			7,384		2.78		323,119			10,323		3.19
Qualifying debt	42,297			1,754		4.15		38,099			1,823		4.78
Total interest-bearing liabilities	6,649,642			31,486		0.47		5,628,174			29,760		0.53
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	2,153,686							1,954,248
Other liabilities	123,650							119,405
Stockholders’ equity	964,131							798,497
Total liabilities and stockholders' equity	$	9,891,109						$	8,500,324
Net interest income and margin (4)				$	384,893	4.42	%				$	332,895	4.39	%
Net interest spread (5)						4.29	%						4.24	%

(1) Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $24.6 million and $13.3 million for 2014 and 2013, respectively.

(2) Net loan fees of $18.7 million and $15.9 million are included in the yield computation for 2014 and 2013, respectively.

(3) Includes non-accrual loans.

(4) Net interest margin is computed by dividing net interest income by total average earning assets.

(5) Net interest spread represents average yield earned on interest-earning assets less the average rate paid on interest bearing liabilities.

38

	Year Ended December 31,									Year Ended December 31,
	2015 versus 2014									2014 versus 2013
	Increase (Decrease) Due to Changes in (1)									Increase (Decrease) Due to Changes in (1)
	Volume			Rate			Total			Volume			Rate			Total
	(in thousands)
Interest income:
Loans	$	110,417		$	(4,922	)	$	105,495		$	64,675		$	(20,467	)	$	44,208
Securities - taxable	1,741			(1,119		)	622			7,157			(6		)	7,151
Securities - tax-exempt	(347		)	73			(274		)	(1,464		)	3,119			1,655
Total securities	1,394			(1,046		)	348			5,693			3,113			8,806
Other	785			2,137			2,922			(1,742		)	2,452			710
Total interest income	112,596			(3,831		)	108,765			68,626			(14,902		)	53,724
Interest expense:
Interest bearing transaction accounts	337			(123		)	214			294			(106		)	188
Savings and money market	2,395			(703		)	1,692			2,042			257			2,299
Time certificates of deposit	207			(330		)	(123		)	1,174			16			1,190
Short-term borrowings	320			2,309			2,629			(398		)	1,455			1,057
Long-term debt	(1,978		)	(4,605		)	(6,583		)	(1,592		)	(1,347		)	(2,939		)
Qualifying debt	3,245			8			3,253			174			(243		)	(69		)
Total interest expense	4,526			(3,444		)	1,082			1,694			32			1,726
Net increase (decrease)	$	108,070		$	(387	)	$	107,683		$	66,932		$	(14,934	)	$	51,998

(1) Changes due to both volume and rate have been allocated to volume changes.

Comparison of interest income, interest expense and net interest margin

The Company's primary source of revenue is interest income. For the year ended December 31, 2015, interest income was $525.1 million, an increase of 26.1%, compared to $416.4 million for the year ended December 31, 2014. This increase was primarily the result of a $2.24 billion increase in the average loan balance which drove a $105.5 million increase in loan interest income for the year ended December 31, 2015. The acquisition of Bridge increased the 2015 average loan balance by $786.7 million. Other interest income increased by $2.9 million for the comparable period primarily due to FRB dividends in 2015 of $1.7 million, compared to zero in 2014. Average yield on interest earning assets increased to 4.79% for the year ended December 31, 2015, compared to 4.76% for the same period in 2014, which was primarily the result of increased yields on other interest earning assets.

For the year ended December 31, 2015, interest expense was $32.6 million, compared to $31.5 million for the year ended December 31, 2014. Interest expense on deposits increased $1.8 million for the same period as average interest bearing deposits increased $1.09 billion, offset by a 2 basis point decrease in average cost of interest bearing deposits. Interest expense on short-term and long-term borrowing decreased by $4.0 million as a result of a $177.2 million decrease in average short-term and long-term borrowings for the year ended December 31, 2015 compared to the same period in 2014.

For the year ended December 31, 2015, net interest income was $492.6 million, compared to $384.9 million for the year ended December 31, 2014. The increase in net interest income reflects a $2.35 billion increase in average interest earning assets, offset by a $994.6 million increase in average interest-bearing liabilities. The acquisition of Bridge increased the 2015 average interest earning assets by $826.7 million and average interest-bearing liabilities by $314.9 million. The increase in net interest margin of 9 basis points was mostly due to collection of fees associated with early loan payoffs and the payoff of the Company's 10% Senior Notes.

Interest income for the year ended December 31, 2014 was $416.4 million, an increase of 14.8%, compared to $362.7 million for the year ended December 31, 2013. This increase was primarily the result of the $1.30 billion increase in the average loan balance from the prior year, which drove the $44.2 million increase in loan interest income for the year ended December 31, 2014 compared to 2013. Interest income on investment securities increased $8.8 million and other interest income increased by $0.7 million for the comparable period. Despite the overall increase in interest income, average yield on interest earning assets dropped 1 basis point for the year ended December 31, 2014 compared to 2013, which was primarily the result of decreased yields on loans of 20 basis points.

39

Interest expense for the year ended December 31, 2014 was $31.5 million compared to $29.8 million in 2013, an increase of $1.7 million, or 5.8%. This increase was driven by the increase in average interest bearing deposits of $1.10 billion for the year ended December 31, 2014 compared to 2013.

Net interest income was $384.9 million for the year ended December 31, 2014, compared to $332.9 million in 2013, an increase of $52.0 million, or 15.6%. The increase in net interest income reflects a $1.38 billion increase in average interest earning assets, offset by a $1.10 billion increase in average interest-bearing liabilities. The increase in net interest margin of 3 basis points was mostly due to a decrease in our average cost of funds of 6 basis points for the year ended December 31, 2014 compared to 2013.

Provision for Credit Losses

The provision for credit losses in each period is reflected as a reduction in earnings in that period. The provision is equal to the amount required to maintain the allowance for credit losses at a level that is adequate to absorb probable credit losses inherent in the loan portfolio. For the year ended December 31, 2015, the provision for credit losses was $3.2 million, compared to $4.7 million for the year ended December 31, 2014. The provision decrease was primarily due to an improvement in underlying asset quality and sustained loan recoveries during 2015. The Company may establish an additional allowance for credit losses for PCI loans through provision for credit losses when impairment is determined as a result of lower than expected cash flows. As of December 31, 2015 and 2014, the allowance for credit losses on PCI loans was $36 thousand and $0.3 million, respectively.

Non-interest Income

The following table presents a summary of non-interest income for the periods presented: 

	Year Ended December 31,
	2015			2014			Increase (Decrease)			2014			2013			Increase (Decrease)
	(in thousands)
Service charges and fees	$	14,639		$	10,567		$	4,072		$	10,567		$	10,123		$	444
Income from bank owned life insurance	3,899			4,508			(609		)	4,508			4,809			(301		)
Card income	3,679			3,310			369			3,310			2,626			684
Lending related fees	1,948			71			1,877			71			—			71
Gain (loss) on sales of investment securities, net	615			757			(142		)	757			(1,195		)	1,952
(Loss) on extinguishment of debt	(81		)	(502		)	421			(502		)	(1,387		)	885
Unrealized gains (losses) on assets and liabilities measured at fair value, net	47			1,212			(1,165		)	1,212			(6,483		)	7,695
Bargain purchase gain from acquisition	—			—			—			—			10,044			(10,044		)
Other income	5,022			4,728			294			4,728			3,660			1,068
Total non-interest income	$	29,768		$	24,651		$	5,117		$	24,651		$	22,197		$	2,454

Total non-interest income for the year ended December 31, 2015 compared to 2014, increased by $5.1 million, or 20.8%. The increase was primarily due to service charges and fees and lending related fees, which were partially offset by the decrease in net unrealized gains on assets and liabilities measured at fair value. The increase in service charges and fees and lending related fees was due to the growth of the Company's deposit base, both organically and from the addition of Bridge, as well as the Company's continued focus on collection of service charges on customer accounts. Bridge contributed $2.6 million to total service charges and fees and $1.3 million of lending related fees for the six months ended December 31, 2015. Lending related fees consisted primarily of warrant income of $0.6 million and SBA income of $1.0 million. The $1.2 million decrease in net unrealized gains on assets and liabilities measured at fair value primarily related to the fair value adjustment of junior subordinated debt, which was a gain of $1.4 million in 2014 and is no longer recurring in 2015 due to the early adoption of an element of ASU 2016-01, which requires presentation of the fair value adjustment in OCI rather than earnings. See "Note 1. Summary of Significant Accounting Policies" for further discussion of the impact of adoption.

Total non-interest income for the year ended December 31, 2014 compared to 2013, increased by $2.5 million, or 11.1%. The increase was primarily due to net unrealized gains on the assets and liabilities measured at fair value, a net gain on sales of investment securities, and other income, which were offset by a non-recurring bargain purchase gain from the acquisition of Centennial Bank during 2013. The $7.7 million increase in non-interest income from the net unrealized gain on assets and liabilities measured at fair value in 2014 primarily related to the fair value adjustment of junior subordinated debt, which was a gain of $1.4 million for 2014, compared to a loss of $5.6 million for 2013. The net gain on sales of investment securities of

40

$0.8 million for 2014, compared to a net loss of $1.2 million in 2013 was the result of improved market conditions. The increase in other income largely resulted from a $2.1 million increase in operating lease income and a $0.4 million customer referral bonus payment that was earned in 2014. These increases were offset by the non-recurring bargain purchase gain of $10.0 million from the acquisition of Centennial Bank during 2013.

Non-interest Expense

The following table presents a summary of non-interest expense for the periods presented:

	Year Ended December 31,
	2015			2014			Increase (Decrease)			2014			2013			Increase (Decrease)
	(in thousands)
Salaries and employee benefits	$	149,828		$	126,630		$	23,198		$	126,630		$	113,434		$	13,196
Occupancy	22,180			18,155			4,025			18,155			19,378			(1,223		)
Legal, professional, and directors' fees	18,548			14,278			4,270			14,278			13,633			645
Data processing	14,776			10,057			4,719			10,057			8,589			1,468
Insurance	11,003			8,862			2,141			8,862			8,094			768
Loan and repossessed asset expenses	4,377			4,423			(46		)	4,423			4,198			225
Card expense	2,764			2,417			347			2,417			1,805			612
Marketing	2,885			2,300			585			2,300			2,581			(281		)
Intangible amortization	1,970			1,461			509			1,461			2,388			(927		)
Net (gain) on sales / valuations of repossessed and other assets	(2,070		)	(5,350		)	3,280			(5,350		)	(2,387		)	(2,963		)
Acquisition / restructure expense	8,836			198			8,638			198			5,752			(5,554		)
Other expense	25,509			23,888			1,621			23,888			18,751			5,137
Total non-interest expense	$	260,606		$	207,319		$	53,287		$	207,319		$	196,216		$	11,103

Total non-interest expense for the year ended December 31, 2015, compared to 2014, increased$53.3 million, or 25.7%. This increase primarily related to salaries and employee benefits, acquisition / restructure expense, data processing, legal, professional, and directors' fees, and occupancy. The rise in salaries and employee benefits was primarily attributable to the addition of Bridge employees as well as growth in staffing to support continued asset growth. The increase in acquisition / restructure expense was driven by the acquisition of Bridge in June 2015. Data processing increased due to the addition of Bridge and technology enhancement initiatives. Legal and professional fees also increased due to the addition of Bridge. The increase in occupancy related to the addition of Bridge offices, which increased rent expense, office utilities, and depreciation on premises and equipment.

Total non-interest expense for the year ended December 31, 2014, compared to 2013, increased$11.1 million, or 5.7%. This increase primarily related to salaries and employee benefits, other expense, and data processing, which were offset by a decrease in acquisition / restructure expense and an increase in the net gain on sales / valuation of repossessed and other assets. The increase in salaries and employee benefits was due to employment growth to support continued asset growth. The growth in other expense primarily related to a $1.5 million increase in operating lease depreciation, a $1.0 million funding of a charitable foundation, a $0.8 million increase related to the write-off of an internal software department project that the Company was no longer pursuing at year end, and an overall increase in general operational expenses. The rise in data processing relates to information technology initiatives and overall growth in business activities. These increases were offset by a decrease in acquisition / restructure expenses caused by the acquisition of Centennial and IT restructuring costs incurred during 2013. Further offsetting the increase in total non-interest expense was the $3.0 million increase in the net gain on sales / valuations of repossessed and other assets due to an increase in other real estate owned property sales with increased gains compared to 2013.

Income Taxes

The effective tax rate for the year ended December 31, 2015 was 24.87%, compared to 24.50% for the year ended December 31, 2014, and 20.48% for the year ended December 31, 2013. There was not a significant change in the effective tax rate from 2014 compared to 2015. The increase in the effective tax rate from 2013 compared to 2014 is primarily due to the increase in pre-tax book income and the absence of acquisition related benefits for the year ended December 31, 2014 compared to 2013.

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Business Segment Results

As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. As a substantial portion of Bridge's balance sheet is generated from nationally-focused business lines, the operations of these business lines are included in the CBL segment. As the Bridge acquisition was completed on June 30, 2015, the results of operation of Bridge are included in the Company's Consolidated Income Statements beginning on July 1, 2015. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly.

The operating segments were as follows: Arizona, Nevada, Southern California, Northern California, CBL, and Corporate & Other. The following tables present selected operating segment information for the periods presented:

	Arizona	Nevada	Southern California	Northern California	Central Business Lines	Corporate & Other	Consolidated Company
At December 31, 2015	(in millions)
Loans, net of deferred loan fees and costs (1)	2,811.7	1,737.2	1,761.9	1,188.4	3,597.9	39.6	11,136.7
Deposits	2,880.7	3,382.8	1,902.5	1,541.1	2,134.4	189.1	12,030.6
At December 31, 2014
Loans, net of deferred loan fees and costs	2,341.9	1,668.7	1,553.1	198.6	2,590.0	46.0	8,398.3
Deposits	2,178.0	3,230.6	1,744.5	584.0	946.6	247.3	8,931.0

(1) In the third quarter of 2015, $141.4 million of loans were transferred from the CBL segment to the Arizona segment. Prior period segment balances were not restated as this transfer is not considered material.

	Arizona	Nevada	Southern California	Northern California	Central Business Lines	Corporate & Other		Consolidated Company
Year Ended December 31, 2015:				(in thousands)
Pre-tax income	71,102	78,618	49,581	28,660	78,584	(48,007	)	258,538
Year Ended December 31, 2014:
Pre-tax income	58,772	74,311	46,881	5,460	33,583	(21,508	)	197,499

BALANCE SHEET ANALYSIS

Total assets increased$3.68 billion, or 34.7%, to $14.28 billion at December 31, 2015, compared to $10.60 billion at December 31, 2014. The increase in assets primarily related to the $2.23 billion in assets acquired from Bridge as well as organic loan growth. Loans increased $2.74 billion, or 32.6%, to $11.14 billion at December 31, 2015, of which, $1.44 billion related to loans acquired from Bridge.

Total liabilities increased$3.08 billion, or 32.1%, to $12.68 billion at December 31, 2015, compared to $9.60 billion at December 31, 2014. The increase in liabilities was due to an increase in total deposits of $3.10 billion, or 34.7%, to $12.03 billion. Total deposits increased $1.74 billion from the acquisition of Bridge, with the remaining increase attributable to organic deposit growth.

Total stockholders’ equity increased by $590.6 million, or 59.0%, to $1.59 billion at December 31, 2015, compared to $1.00 billion at December 31, 2014. There were several significant items that had offsetting effects on stockholders' equity during the year. The acquisition of Bridge increased stockholders' equity by $431.0 million as a result of the issuance of 12.5 million shares of the Company's common stock and the conversion of Bridge restricted stock awards into WAL restricted stock awards, which resulted in the issuance of 546,151 shares of WAL restricted stock. During 2015, the Company raised $28.3 million in net proceeds from the issuance of 760,376 shares of common stock under the Company's $100 million ATM public offering. These additions were offset by the redemption of the Company's remaining 70,500 outstanding shares of Non-Cumulative Perpetual Preferred Stock, Series B. The shares were redeemed at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

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Investment securities

Investment securities are classified at the time of acquisition as either HTM, AFS, or measured at fair value based upon various factors, including asset/liability management strategies, liquidity and profitability objectives, and regulatory requirements. HTM securities are carried at amortized cost, adjusted for amortization of premiums or accretion of discounts. AFS securities are securities that may be sold prior to maturity based upon asset/liability management decisions. Investment securities classified as AFS are carried at fair value. Unrealized gains or losses on AFS securities are recorded as part of AOCI in stockholders’ equity. Amortization of premiums or accretion of discounts on MBS is periodically adjusted for estimated prepayments. Investment securities measured at fair value are reported at fair value, with unrealized gains and losses included in current period earnings.

The investment securities portfolio of the Company is utilized as collateral for borrowings, required collateral for public deposits, and customer repurchase agreements, and to manage liquidity, capital, and interest rate risk. The following table summarizes the carrying value of the investment securities portfolio for each of the periods below: 

	At December 31,
	2015		2014		2013		2012		2011
	(in thousands)
Collateralized debt obligations	$	10,060	$	11,445	$	50	$	50	$	50
Commercial MBS issued by GSEs	19,114		2,147		—		—		—
Corporate debt securities	13,251		52,489		97,777		97,781		107,360
CRA investments	34,685		24,332		24,882		25,816		25,015
Municipal obligations	334,830		299,037		299,244		265,073		187,509
Mutual funds	—		37,702		36,532		37,961		28,864
Preferred stock	111,236		82,612		61,484		75,555		54,676
Private label commercial MBS	4,691		5,149		5,433		5,741		5,431
Private label residential MBS	257,128		70,243		36,099		35,607		25,784
Residential MBS issued by GSEs	1,171,702		893,047		1,024,457		668,265		871,099
Trust preferred securities	24,314		25,546		23,805		24,135		21,159
U.S. government sponsored agency securities	—		18,346		46,975		—		156,211
U.S. treasury securities	2,993		—		—		—		—
Total investment securities	$	1,984,004	$	1,522,095	$	1,656,738	$	1,235,984	$	1,483,158

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Weighted average yield is calculated by dividing income within each maturity range by the outstanding amount of the related investment and has not been tax affected on tax-exempt obligations. For purposes of calculating the weighted average yield, AFS and securities measured at fair value are carried at amortized cost in the table below. The maturity distribution and weighted average yield of our investment security portfolios at December 31, 2015 are summarized in the table below: 

	December 31, 2015
	Due Under 1 Year				Due 1-5 Years				Due 5-10 Years				Due Over 10 Years				Total
	Amount		Yield		Amount		Yield		Amount		Yield		Amount		Yield		Amount		Yield
	(dollars in thousands)
Available-for-sale
Collateralized debt obligations	$	—	—	%	$	—	—	%	$	—	—	%	$	50	8.75	%	$	50	8.75	%
Commercial MBS issued by GSEs	—		—		—		—		—		—		19,147		2.76		19,147		2.76
Corporate debt securities	7,696		3.44		—		—		5,073		4.30		—		—		12,769		3.78
CRA investments	34,722		2.07		—		—		—		—		—		—		34,722		2.07
Municipal obligations	19,934		4.45		45,952		3.20		63,862		3.42		190,339		3.44		320,087		3.46
Preferred stock	—		—		28,824		8.13		—		—		79,593		6.71		108,417		7.09
Private label commercial MBS	4,685		3.27		—		—		—		—		—		—		4,685		3.27
Private label residential MBS	—		—		2,618		4.09		—		—		258,912		2.75		261,530		2.77
Residential MBS issued by GSEs	—		—		234		3.32		24,671		2.40		1,144,726		2.20		1,169,631		2.20
Trust preferred securities	—		—		—		—		—		—		32,000		1.37		32,000		1.37
U.S. treasury securities	500		0.18		2,496		1.45		—		—		—		—		2,996		1.24
Total AFS securities	$	67,537	3.00	%	$	80,124	4.95	%	$	93,606	3.20	%	$	1,724,767	2.62	%	$	1,966,034	2.75	%
Securities measured at fair value
Residential MBS issued by GSEs	$	—	—	%	$	—	—	%	$	—	—	%	$	1,389	3.59	%	$	1,389	3.59	%
Total securities measured at fair value	$	—	—	%	$	—	—	%	$	—	—	%	$	1,389	3.59	%	$	1,389	3.59	%

The Company does not own any subprime MBS in its investment portfolio. The majority of its MBS are GSE issued. The remaining MBS not GSE issued consist of $235.6 million rated AAA, $40 thousand rated AA, $3.2 million rated A, $1.8 million rated BBB, and $2.7 million are non-investment grade.

Gross unrealized losses at December 31, 2015 are primarily caused by interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The Company has reviewed securities on which there is an unrealized loss in accordance with its accounting policy for OTTI securities described in "Note 3. Investment Securities" to the Consolidated Financial Statements contained herein. There were no impairment charges recorded during the years ended December 31, 2015, 2014, and 2013.

The Company does not consider any securities to be other-than-temporarily impaired as of December 31, 2015, 2014, and 2013. However, the Company cannot guarantee that OTTI will not occur in future periods. At December 31, 2015, the Company had the intent and ability to retain its investments for a period of time sufficient to allow for any anticipated recovery in fair value.

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Loans

The table below summarizes the distribution of the Company’s held for investment loan portfolio at the end of each of the periods indicated: 

	December 31,
	2015			2014			2013			2012			2011
	(in thousands)
Loans, held for investment
Commercial and industrial	$	5,117,223		$	3,327,629		$	2,236,740		$	1,659,003		$	1,120,107
Commercial real estate - non-owner occupied	2,289,480			2,058,620			1,843,415			1,505,600			1,301,172
Commercial real estate - owner occupied	2,085,738			1,734,617			1,561,862			1,396,797			1,252,182
Construction and land development	1,143,228			754,154			537,231			394,319			381,676
Residential real estate	322,265			298,872			350,312			407,937			443,020
Commercial leases	147,633			204,270			235,968			288,747			216,475
Consumer	26,474			32,633			45,153			31,836			72,504
Deferred loan fees and costs	(19,187		)	(12,530		)	(9,266		)	(6,045		)	(7,067		)
Loans, net of deferred loan fees and costs	11,112,854			8,398,265			6,801,415			5,678,194			4,780,069
Allowance for credit losses	(119,068		)	(110,216		)	(100,050		)	(95,427		)	(99,170		)
Total loans HFI	$	10,993,786		$	8,288,049		$	6,701,365		$	5,582,767		$	4,680,899

As of December 31, 2015 and 2012, the Company also had $23.8 million and $31.1 million of HFS loans.

45

The following table sets forth the amount of loans outstanding by type of loan as of December 31, 2015 that were contractually due in one year or less, more than one year and less than five years, and more than five years based on remaining scheduled repayments of principal. Lines of credit or other loans having no stated final maturity and no stated schedule of repayments are reported as due in one year or less. The table also presents an analysis of the rate structure for loans within the same maturity time periods. Actual cash flows from these loans may differ materially from contractual maturities due to prepayment, refinancing, or other factors.

	Due in one year or less		Due after one year to five years		Due after five years		Total
	(in thousands)
Commercial and industrial
Floating rate	$	124,018	$	2,161,901	$	974,525	$	3,260,444
Fixed rate	58,072		323,649		1,476,513		1,858,234
Commercial real estate — non-owner occupied
Floating rate	25,400		664,517		739,365		1,429,282
Fixed rate	15,864		603,751		234,639		854,254
Commercial real estate — owner occupied
Floating rate	10,315		197,826		990,879		1,199,020
Fixed rate	3,351		269,333		630,969		903,653
Construction and land development
Floating rate	42,529		864,428		64,372		971,329
Fixed rate	6,446		129,620		26,044		162,110
Residential real estate
Floating rate	3,583		60,955		196,583		261,121
Fixed rate	638		26,759		34,421		61,818
Leases
Floating rate	—		4,105		—		4,105
Fixed rate	218		99,800		44,370		144,388
Consumer
Floating rate	2,710		12,896		5,581		21,187
Fixed rate	90		3,430		2,198		5,718
Total	$	293,234	$	5,422,970	$	5,420,459	$	11,136,663

As of December 31, 2015, approximately $5.14 billion, or 71.9%, of total variable rate loans were subject to rate floors with a weighted average interest rate of 3.4%. At December 31, 2014, approximately $3.72 billion, or 74.1% of total variable rate loans were subject to rate floors with a weighted average interest rate of 4.9%. At December 31, 2015, total loans consisted of 64.2% with floating rates and 35.8% with fixed rates, compared to 59.9% with floating rates and 40.1% with fixed rates at December 31, 2014.

Concentrations of Lending Activities

The Company monitors concentrations within four broad categories: geography, industry, product, and collateral. The Company’s loan portfolio includes significant credit exposure to the CRE market. At December 31, 2015 and 2014, CRE related loans accounted for approximately 49% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at December 31, 2015 and 2014, respectively.

Interest Reserves

Interest reserves are generally established at the time of the loan origination for construction and land development loans. The Company’s practice is to monitor the construction, sales and/or leasing progress to determine the feasibility of ongoing construction and development projects. The Company discontinues the use of the interest reserve when a project is determined not to be viable and may take appropriate action to protect its collateral position via renegotiation and/or legal action as deemed appropriate. At December 31, 2015, the Company had 21 loans with an outstanding balance of $117.3 million with available interest reserves of $3.6 million. At December 31, 2014, the Company had 33 loans with an outstanding principal balance of $218.4 million and available interest reserve amounts of $8.0 million.

46

Impaired loans

A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis if full repayment of all principal and interest is expected and the loan is both well-secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310 based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for credit losses.

In addition to the Company's own internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations, or loan impairment methodology.

Total non-performing loans decreased by $35.4 million, or 22.5%, at December 31, 2015 to $122.1 million from $157.5 million at December 31, 2014. 

	December 31,
	2015			2014			2013			2012			2011
	(dollars in thousands)
Total non-accrual loans	$	48,381		$	67,659		$	75,680		$	104,716		$	90,392
Loans past due 90 days or more on accrual status	3,028			5,132			1,534			1,388			2,589
Troubled debt restructured loans (1)	70,707			84,720			89,576			84,609			112,483
Total nonperforming loans	122,116			157,511			166,790			190,713			205,464
Other impaired loans	6,758			9,239			11,587			7,442			4,027
Total impaired loans	$	128,874		$	166,750		$	178,377		$	198,155		$	209,491
Other assets acquired through foreclosure, net	$	43,942		$	57,150		$	66,719		$	77,247		$	89,104
Non-accrual loans to gross loans held for investment	0.44		%	0.81		%	1.11		%	1.83		%	1.89		%
Loans past due 90 days or more on accrual status to gross loans held for investment	0.03			0.06			0.02			0.02			0.05
Interest income received on non-accrual loans	$	1,634		$	2,536		$	1,916		$	191		$	444
Interest income that would have been recorded under the original terms of non-accrual loans	2,549			3,758			5,405			5,469			6,331

(1) Includes accruing TDR loans only.

The composition of non-accrual loans by loan type and by segment were as follows: 

	December 31, 2015						December 31, 2014
	Non-accrual Balance		Percent of Non-Accrual Balance		Percent of Total HFI Loans		Non-accrual Balance		Percent of Non-Accrual Balance		Percent of Total HFI Loans
	(dollars in thousands)
Commercial and industrial	$	20,877	43.15	%	0.19	%	$	3,490	5.16	%	0.04	%
Commercial real estate	18,675		38.60		0.17		52,457		77.54		0.63
Construction and land development	2,309		4.77		0.02		5,326		7.87		0.06
Residential real estate	6,324		13.07		0.06		6,173		9.12		0.07
Consumer	196		0.41		0.00		213		0.31		0.01
Total non-accrual loans	$	48,381	100.00	%	0.44	%	$	67,659	100.00	%	0.81	%

47

	December 31, 2015				December 31, 2014
	Nonaccrual Loans		Percent of Segment's Total HFI Loans		Nonaccrual Loans		Percent of Segment's Total HFI Loans
	(dollars in thousands)
Arizona	$	10,596	0.38	%	$	24,179	1.03	%
Nevada	8,010		0.46		26,679		1.60
Southern California	2,844		0.16		388		0.02
Northern California	1,590		0.14		—		—
Central Business Lines	10,218		0.28		188		0.01
Corporate & Other	15,123		38.18		16,225		35.30
Total non-accrual loans	$	48,381	0.44	%	$	67,659	0.81	%

Troubled Debt Restructured Loans

A TDR loan is a loan that is granted a concession, for reasons related to a borrower’s financial difficulties, that the lender would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in accrued interest, extensions, deferrals, renewals, and rewrites. A TDR loan is also considered impaired. Generally, a loan that is modified at an effective market rate of interest is no longer disclosed as a TDR in years subsequent to the restructuring if it is performing based on the terms specified by the restructuring agreement. However, such loans continue to be considered impaired.

As of December 31, 2015 and 2014, the aggregate amount of loans classified as impaired was $128.9 million and $166.8 million, respectively, a net decrease of 22.7%. The total specific allowance for credit losses related to these loans was $4.7 million and $10.8 million at December 31, 2015 and 2014, respectively. The Company had $70.7 million and $84.7 million in loans classified as accruing restructured loan at December 31, 2015 and 2014, respectively.

Impaired loans by segment at December 31, 2015 and 2014 were as follows:

	December 31,
	2015		2014
	(in thousands)
Arizona	$	22,400	$	43,174
Nevada	56,843		78,072
Southern California	3,181		5,203
Northern California	—		—
Central Business Lines	10,218		188
Corporate & Other	36,232		40,113
Total impaired loans	$	128,874	$	166,750

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The following tables present a breakdown of total impaired loans and the related specific reserves for the periods indicated: 

	December 31, 2015
	Impaired Balance		Percent of Impaired Balance		Percent of Total HFI Loans		Reserve Balance		Percent of Reserve Balance		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	29,409	22.82	%	0.26	%	$	3,518	75.52	%	2.95	%
Commercial real estate	64,234		49.84		0.58		869		18.66		0.73
Construction and land development	18,322		14.22		0.16		—		—		—
Residential real estate	16,575		12.86		0.15		270		5.80		0.23
Consumer	334		0.26		—		1		0.02		—
Total impaired loans	$	128,874	100.00	%	1.16	%	$	4,658	100.00	%	3.91	%

	December 31, 2014
	Impaired Balance		Percent of Impaired Balance		Percent of Total HFI Loans		Reserve Balance		Percent of Reserve Balance		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	14,122	8.47	%	0.17	%	$	1,965	18.25	%	1.78	%
Commercial real estate	111,217		66.70		1.32		4,619		42.91		4.19
Construction and land development	21,748		13.04		0.26		3,112		28.91		2.82
Residential real estate	19,300		11.57		0.23		1,052		9.77		0.95
Consumer	363		0.22		—		17		0.16		0.02
Total impaired loans	$	166,750	100.00	%	1.98	%	$	10,765	100.00	%	9.76	%

The amount of interest income recognized on impaired loans for the years ended December 31, 2015, 2014, and 2013 was approximately $4.8 million, $5.5 million, and $6.2 million, respectively.

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Allowance for Credit Losses

The following table summarizes the activity in our allowance for credit losses for the period indicated: 

	Year Ended December 31,
	2015			2014			2013			2012			2011
	(dollars in thousands)
Allowance for credit losses:
Balance at beginning of period	$	110,216		$	100,050		$	95,427		$	99,170		$	110,699
Provision charged to operating expense:
Commercial and industrial	18,411			14,551			5,760			21,599			1,109
Commercial real estate	(9,762		)	(6,176		)	2,972			15,823			21,959
Construction and land development	(1,454		)	1,966			3,443			4,448			2,692
Residential real estate	(3,539		)	(4,352		)	228			2,088			16,256
Consumer	(456		)	(1,263		)	817			2,886			4,172
Total Provision	3,200			4,726			13,220			46,844			46,188
Recoveries of loans previously charged-off:
Commercial and industrial	(3,754		)	(4,728		)	(5,037		)	(3,067		)	(3,401		)
Commercial real estate	(4,139		)	(3,859		)	(2,758		)	(3,294		)	(2,157		)
Construction and land development	(1,872		)	(2,160		)	(2,060		)	(2,903		)	(2,154		)
Residential real estate	(2,181		)	(1,896		)	(2,097		)	(1,078		)	(1,060		)
Consumer	(203		)	(459		)	(930		)	(357		)	(174		)
Total recoveries	(12,149		)	(13,102		)	(12,882		)	(10,699		)	(8,946		)
Loans charged-off:
Commercial and industrial	5,550			4,370			4,000			17,341			9,757
Commercial real estate	—			964			8,648			19,166			22,128
Construction and land development	—			87			1,538			10,992			11,238
Residential real estate	820			1,728			5,922			7,063			19,071
Consumer	127			513			1,371			6,724			4,469
Total charged-off	6,497			7,662			21,479			61,286			66,663
Net (recoveries) charge-offs	(5,652		)	(5,440		)	8,597			50,587			57,717
Balance at end of period	$	119,068		$	110,216		$	100,050		$	95,427		$	99,170
Net (recoveries) charge-offs to average loans outstanding - annualized	(0.06		)%	(0.07		)%	0.14		%	0.99		%	1.32		%
Allowance for credit losses to gross loans	1.07			1.31			1.47			1.67			2.07

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The following table summarizes the allocation of the allowance for credit losses by loan type. However, the allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. 

	Commercial and Industrial			Commercial Real Estate			Construction and Land Development			Residential Real Estate			Consumer			Total
	(dollars in thousands)
December 31, 2015
Allowance for Credit Losses	$	71,181		$	23,160		$	18,976		$	5,278		$	473		$	119,068
Percent of Total Allowance for Credit Losses	59.8		%	19.5		%	15.9		%	4.4		%	0.4		%	100.0		%
Percent of Gross Loans to Total Gross HFI Loans	47.3			39.3			10.3			2.9			0.2			100.0
December 31, 2014
Allowance for Credit Losses	$	54,566		$	28,783		$	18,558		$	7,456		$	853		$	110,216
Percent of Total Allowance for Credit Losses	49.5		%	26.1		%	16.8		%	6.8		%	0.8		%	100.0		%
Percent of Gross Loans to Total Gross HFI Loans	42.0			45.0			9.0			3.6			0.4			100.0
December 31, 2013
Allowance for Credit Losses	$	39,657		$	32,064		$	14,519		$	11,640		$	2,170		$	100,050
Percent of Total Allowance for Credit Losses	39.7		%	32.0		%	14.5		%	11.6		%	2.2		%	100.0		%
Percent of Gross Loans to Total Gross HFI Loans	36.3			50.0			7.9			5.1			0.7			100.0
December 31, 2012
Allowance for Credit Losses	$	32,860		$	34,982		$	10,554		$	15,237		$	1,794		$	95,427
Percent of Total Allowance for Credit Losses	34.4		%	36.7		%	11.0		%	16.0		%	1.9		%	100.0		%
Percent of Gross Loans to Total Gross HFI Loans	34.3			51.1			6.9			7.2			0.5			100.0
December 31, 2011
Allowance for Credit Losses	$	25,535		$	35,031		$	14,195		$	19,134		$	5,275		$	99,170
Percent of Total Allowance for Credit Losses	25.7		%	35.4		%	14.3		%	19.3		%	5.3		%	100.0		%
Percent of Gross Loans to Total Gross HFI Loans	27.9			53.3			8.0			9.3			1.5			100.0

The allowance for credit losses as a percentage of total loans decreased to 1.07% at December 31, 2015 from 1.31% at December 31, 2014. The total balance of the allowance for credit losses has increased due to the increase in the size of the loan portfolio. However, the increase in the allowance is not proportional to the increase in the portfolio as the Company has experienced improved credit quality in its portfolio as reflected in net recoveries achieved during the year ended December 31, 2015 as well as a change in portfolio mix toward higher rated credits. Further, the loans acquired in the Bridge acquisition were recorded at fair value and no previous allowance for credit losses was carried over therefore reducing the allowance for credit losses to total loans ratio. See "Non-GAAP Financial Measures" in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" for an allowance for credit losses to gross loans ratio that has been adjusted for acquisition accounting.

51

Problem Loans

The Company classifies loans consistent with federal banking regulations using a nine category grading system. These loan grades are described in further detail in "Item 1. Business” of this Form 10-K. The following table presents information regarding potential and actual problem loans, consisting of loans graded Special Mention, Substandard, Doubtful, and Loss, but still performing, and excluding acquired loans: 

	December 31, 2015
	Number of Loans	Loan Balance		Percent of Loan Balance		Percent of Total HFI Loan Balance
	(dollars in thousands)
Commercial and industrial	90	$	80,011	55.69	%	0.72	%
Commercial real estate	50	40,345		28.08		0.36
Construction and land development	3	17,734		12.34		0.16
Residential real estate	12	5,309		3.70		0.05
Consumer	8	271		0.19		—
Total	163	$	143,670	100.00	%	1.29	%

	December 31, 2014
	Number of Loans	Loan Balance		Percent of Loan Balance		Percent of Total HFI Loan Balance
	(dollars in thousands)
Commercial and industrial	76	$	24,060	23.89	%	0.29	%
Commercial real estate	55	53,514		53.14		0.64
Construction and land development	6	15,646		15.53		0.19
Residential real estate	16	7,121		7.07		0.08
Consumer	10	377		0.37		—
Total	163	$	100,718	100.00	%	1.20	%

52

Other Assets Acquired Through Foreclosure

The following table represents the changes in other assets acquired through foreclosure: 

	Year Ended December 31,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,407			—			1,407
Transfers to other assets acquired through foreclosure, net	28,566			—			28,566
Proceeds from sale of other real estate owned and repossessed assets, net	(51,038		)	5,411			(45,627		)
Valuation adjustments, net	—			(182		)	(182		)
Gains, net (1)	2,628			—			2,628
Balance, end of period	$	52,984		$	(9,042	)	$	43,942
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	13,777			—			13,777
Proceeds from sale of other real estate owned and repossessed assets, net	(33,643		)	7,725			(25,918		)
Valuation adjustments, net	—			(294		)	(294		)
Gains, net (1)	2,866			—			2,866
Balance, end of period	$	71,421		$	(14,271	)	$	57,150
	2013
Balance, beginning of period	$	113,474		$	(36,227	)	$	77,247
Transfers to other assets acquired through foreclosure, net	24,911			—			24,911
Additions from acquisition of Centennial	5,622			—			5,622
Proceeds from sale of other real estate owned and repossessed assets, net	(61,510		)	18,268			(43,242		)
Valuation adjustments, net	—			(3,743		)	(3,743		)
Gains, net (1)	5,924			—			5,924
Balance, end of period	$	88,421		$	(21,702	)	$	66,719

(1) Includes net gains related to initial transfers to other assets of $0.9 million, $0.1 million, and $0.9 million during the years ended December 31, 2015, 2014, and 2013, respectively, pursuant to accounting guidance.

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. OREO and other repossessed property are reported at the lower of carrying value or fair value less estimated costs to sell the property. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $43.9 million, $57.2 million, and $66.7 million of such assets at December 31, 2015, 2014, and 2013 respectively.

At December 31, 2015, the Company held 39 OREO properties, compared to 67 at December 31, 2014.

Goodwill and Other Intangible Assets

Goodwill represents the excess consideration paid for net assets acquired in a business combination over their fair value. Goodwill and other intangible assets acquired in a business combination and determined to have an indefinite useful life are not subject to amortization, but are subsequently evaluated for impairment at least annually. The Company has goodwill of $289.6 million, which includes $266.4 million acquired in the Bridge acquisition. Intangible assets total $15.7 million at December 31, 2015, which includes $15.0 million acquired in the Bridge acquisition on June 30, 2015. The goodwill and intangible balances at December 31, 2015 are allocated to the Nevada, Northern California, and CBL operating segments. See "Note 2. Mergers, Acquisitions and Dispositions" to the Consolidated Financial Statements for further discussion of the Bridge acquisition and the allocation of goodwill and intangible assets acquired.

The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. During the years ended December 31, 2015, 2014,

53

and 2013, and there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary, and based on the Company's annual goodwill and intangibles impairment tests as of October 1 of each of these years, it was determined that goodwill and intangible assets were not impaired.

The following is a summary of acquired intangible assets:

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in thousands)
Subject to amortization:
Core deposit intangibles	$	40,804	$	25,438	$	15,366	$	26,157	$	23,468	$	2,689
	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Impairment		Net Carrying Amount		Gross Carrying Amount		Impairment		Net Carrying Amount
Not subject to amortization
Trade name	$	350	$	—	$	350	$	—	$	—	$	—

Deferred Tax Assets

For the year ended December 31, 2015, the net deferred tax asset increased$23.7 million to $86.4 million. This overall increase in the net deferred tax asset was primarily the result of increases to deferred tax assets from the effects of the Bridge merger; a change in fair market value of junior subordinated debt and AFS securities; and the increase in the allowance for credit losses.

At December 31, 2015, there is no deferred tax valuation allowance, compared to $2.3 million at December 31, 2014. The valuation allowance at December 31, 2014 related to net capital losses from ARPS securities sales and IRC Section 382 limits on NOL carryovers from the Western Liberty acquisition, which based on facts that arose during 2015 are now more-likely-than-not to be realized.

Deposits

Deposits are the primary source for funding the Company's asset growth. Total deposits increased to $12.03 billion at December 31, 2015, from $8.93 billion at December 31, 2014, an increase of $3.10 billion, or 34.7%. Deposits increased $1.74 billion from the acquisition of Bridge, with the remaining increase attributable to organic deposit growth. Non-interest-bearing demand deposits increased by $1.81 billion from December 31, 2014. Savings and money market deposits increased $1.43 billion from December 31, 2014.

WAB is a member of Promontory, a network that offers deposit placement services such as CDARS and ICS, which offer products that qualify large deposits for FDIC insurance. At December 31, 2015, the Company had $517.5 million of CDARS deposits and $714.4 million of ICS deposits, compared to $700.7 million of CDARS deposits and $481.2 million of ICS deposits at December 31, 2014. At December 31, 2015 and 2014, the Company also had $184.2 million and $257.0 million, respectively, of wholesale brokered deposits. There was also $365.6 million and $202.4 million of additional deposits as of December 31, 2015 and 2014, respectively, that the Company considers core deposits, but which are classified as brokered deposits for regulatory reporting purposes.

54

The average balances and weighted average rates paid on deposits are presented below:

	Year Ended December 31,
	2015				2014				2013
	Average Balance		Rate		Average Balance		Rate		Average Balance		Rate
	(dollars in thousands)
Interest checking (NOW)	$	983,889	0.18	%	$	793,118	0.19	%	$	640,062	0.21	%
Savings and money market	4,470,189		0.28		3,616,829		0.30		2,936,122		0.29
Time certificates of deposit	1,808,120		0.42		1,758,342		0.43		1,488,017		0.43
Total interest-bearing deposits	7,262,198		0.30		6,168,289		0.32		5,064,201		0.32
Non-interest-bearing demand deposits	3,273,138		—		2,153,686		—		1,954,248		—
Total deposits	$	10,535,336	0.21	%	$	8,321,975	0.24	%	$	7,018,449	0.23	%

Certificates of Deposit of $100,000 or More

The table below discloses the remaining maturity for certificates of deposit of $100,000 or more: 

	December 31,
	2015		2014
	(in thousands)
3 months or less	$	1,292,224	$	577,084
3 to 6 months	254,927		474,826
6 to 12 months	348,965		587,348
Over 12 months	90,815		121,746
Total	$	1,986,931	$	1,761,004

Other Borrowings

The Company from time to time utilizes short-term borrowed funds to support short-term liquidity needs generally created by increased loan demand. The majority of these short-term borrowed funds consist of advances from the FHLB and customer repurchase agreements. The Company’s borrowing capacity with the FHLB is determined based on collateral pledged, generally consisting of securities and loans. In addition, the Company has borrowing capacity from other sources, collateralized by securities, including securities sold under agreements to repurchase, which are reflected at the amount of cash received in connection with the transaction, and may require additional collateral based on the fair value of the underlying securities. At December 31, 2015, total short-term borrowed funds consisted of customer repurchase agreements of $38.2 million and FHLB advances of $150.0 million. The Company's Senior Notes matured in September 2015, resulting in a $58.2 million decrease in short-term debt. At December 31, 2014, total short-term borrowed funds consisted of customer repurchase agreements of $54.9 million, Senior Notes with a carrying value of $58.2 million, a revolving line of credit of $25.0 million, and FHLB advances of $97.0 million.

At December 31, 2015, the Company did not have any FHLB advances classified as long-term. At December 31, 2014, total long-term debt consisted of $210.1 million of FHLB advances.

Qualifying Debt

At December 31, 2015, total qualifying debt consisted of $152.0 million of subordinated debt and junior subordinated debt of $58.4 million. At December 31, 2014, qualifying debt consisted of junior subordinated debt of $40.4 million.

On June 29, 2015, the Company issued $150.0 million of subordinated debt, which was recorded net of debt issuance costs of $1.8 million, and matures July 15, 2025. The subordinated debt has a fixed interest rate of 5.00% through June 30, 2020 and then converts to a variable rate of 3.20% plus three-month LIBOR through maturity. The carrying value of subordinated debt includes the effective portion of related hedges and is $152.0 million at December 31, 2015.

55

The Company has formed or acquired through mergers, eight statutory business trusts, including two new business trusts, Bridge Capital Trust I and Bridge Capital Trust II, acquired in the acquisition of Bridge on June 30, 2015. These trusts exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities. All of the funds raised from the issuance of these securities were passed to the Company and are reflected in the accompanying Consolidated Balance Sheets as junior subordinated debt, with a carrying value of $58.4 million as of December 31, 2015.

The junior subordinated debt has contractual balances and maturity dates as follows:

		December 31,
Name of Trust	Maturity	2015			2014
At fair value		(in thousands)
BankWest Nevada Capital Trust II	2033	$	15,464		$	15,464
Intermountain First Statutory Trust I	2034	10,310			10,310
First Independent Statutory Trust I	2035	7,217			7,217
WAL Trust No. 1	2036	20,619			20,619
WAL Statutory Trust No. 2	2037	5,155			5,155
WAL Statutory Trust No. 3	2037	7,732			7,732
Total contractual balance		66,497			66,497
FVO on junior subordinated debt		(19,569		)	(26,060		)
Junior subordinated debt, at fair value		$	46,928		$	40,437
At amortized cost
Bridge Capital Holdings Trust I	2035	$	12,372		$	—
Bridge Capital Holdings Trust II	2036	5,155			—
Total contractual balance		17,527			—
Purchase accounting adjustment, net of accretion (1)		(6,085		)	—
Junior subordinated debt, at amortized cost		$	11,442		$	—
Total junior subordinated debt		$	58,370		$	40,437

(1) The purchase accounting adjustment is being amortized over the remaining life of the trusts, pursuant to accounting guidance.

The weighted average interest rate of all junior subordinated debt as of December 31, 2015 was 2.95%, which is three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 2.73% at December 31, 2014.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB, there will not be a phase out of grandfathered trust preferred securities for banks with assets of less than $15 billion. As such, the Company's securities continue to qualify as Tier 1 or Tier 2 Capital, with certain limitations, and will continue to qualify as the Company grows over the $15 billion threshold through organic growth. Any subsequent acquisitions by the Company once it has crossed the $15 billion threshold and the acquired entity has trust preferred securities, the acquired entity’s trust preferred securities would not qualify as Tier 1 or Tier 2 capital. If the Company crosses the $15 billion threshold as a direct result of an acquisition, neither the Company’s nor the acquired institutions instruments would continue to qualify as Tier 1 or Tier 2 capital.

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Capital Resources

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items (discussed in "Note 16. Commitments and Contingencies" to the Consolidated Financial Statements) as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of Common Equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

As of December 31, 2015 and 2014, the Company and the Bank exceeded the capital levels necessary to be classified as well-capitalized, as defined by the banking agencies. The actual capital amounts and ratios for the Company and the Bank are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
December 31, 2015
WAL	$	1,603,472	$	1,341,011	$	13,193,563	$	13,683,148	12.2	%	10.2	%	9.8	%	9.7	%
WAB	1,485,070		1,213,304		13,073,394		13,561,251		11.4		9.3		9.0		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

Contractual Obligations and Off-Balance Sheet Arrangements

The Company enters into contracts for services in the ordinary course of business that may require payment for services to be provided in the future and may contain penalty clauses for early termination of the contracts. To meet the financing needs of customers, the Company has financial instruments with off-balance sheet risk, including commitments to extend credit and standby letters of credit. The Company has also committed to irrevocably and unconditionally guarantee the payments or distributions with respect to the holders of preferred securities of the Company's eight statutory business trusts to the extent that the trusts have not made such payments or distributions: 1) accrued and unpaid distributions; 2) the redemption price; and 3) upon a dissolution or termination of the trust, the lesser of the liquidation amount and all accrued and unpaid distributions and the amount of assets of the trust remaining available for distribution. The Company does not believe that these off-balance sheet arrangements have or are reasonably likely to have a material effect on its financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures, or capital resources. However, there can be no assurance that such arrangements will not have a future effect.

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The following table sets forth our significant contractual obligations as of December 31, 2015:

	Payments Due by Period
	Total		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
	(in thousands)
Time deposit maturities	$	1,611,654	$	1,507,050	$	97,817	$	6,787	$	—
Qualifying debt	234,024		—		—		—		234,024
Other borrowings	150,000		150,000		—		—		—
Operating lease obligations	44,575		8,547		15,535		11,614		8,879
Purchase obligations	41,758		13,086		11,058		7,445		10,169
Total	$	2,082,011	$	1,678,683	$	124,410	$	25,846	$	253,072

Purchase obligations primarily relate to contracts for software licensing and maintenance and outsourced service providers.

Off-balance sheet commitments associated with outstanding letters of credit, commitments to extend credit, and credit card guarantees as of December 31, 2015 are summarized below. Since commitments associated with letters of credit and commitments to extend credit may expire unused, the amounts shown do not necessarily reflect the actual future cash funding requirements. 

			Amount of Commitment Expiration per Period
	Total Amounts Committed		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
	(in thousands)
Commitments to extend credit	$	3,624,578	$	1,588,558	$	1,401,293	$	267,284	$	367,443
Credit card commitments and financial guarantees	57,966		57,966		—		—		—
Standby letters of credit	50,659		42,749		5,749		2,161		—
Total	$	3,733,203	$	1,689,273	$	1,407,042	$	269,445	$	367,443

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The following table sets forth certain information regarding short-term customer repurchase agreements, lines of credit, FHLB advances, and 10% Senior Notes: 

	December 31,
	2015			2014			2013
Customer Repurchase Accounts:
Maximum month-end balance	$	53,709		$	63,388		$	78,185
Balance at end of year	38,155			54,899			71,192
Average balance	49,924			57,855			61,128
Lines of Credit:
Maximum month-end balance	—			25,000			50,000
Balance at end of year	—			25,000			3,000
Average balance	1,740			1,499			23,858
FHLB Advances:
Maximum month-end balance	330,000			135,300			120,000
Balance at end of year (1)	150,000			96,850			25,300
Average balance	66,493			61,459			18,215
10% Senior Notes:
Maximum month-end balance	58,444			64,945			—
Balance at end of year (2)	—			58,444			—
Average balance	38,909			62,576			—
Total Short-Term Borrowed Funds	$	188,155		$	235,193		$	99,492
Weighted average interest rate at end of year	1.75		%	3.16		%	0.82		%
Weighted average interest rate during year	2.26			4.15			0.63

(1) Excludes premium of $0.1 million, and $0.6 million, respectively as of December 31, 2014 and 2013.

(2) Excludes discount of $0.3 million as of December 31, 2014.

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Critical Accounting Policies

The Notes to the Consolidated Financial Statements contain a discussion of our significant accounting policies, including information regarding recently issued accounting pronouncements, our adoption of such policies and the related impact of their adoption. We believe that certain of these policies, along with various estimates that we are required to make in recording our financial transactions, are important to have a complete understanding of our financial position. In addition, these estimates require us to make complex and subjective judgments, many of which include matters with a high degree of uncertainty. The following is a summary of these critical accounting policies and significant estimates.

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The allowance consists of specific and general components. The specific allowance relates to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) our historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowances for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

Loans acquired with deteriorated credit quality

ASC 310-30, Accounting for Certain Loans or Debt Securities Acquired in a Transfer, applies to a loan with evidence of deterioration of credit quality since its origination, and for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. For these loans accounted for under ASC 310-30, management determines the value of the loan portfolio based, in part, on work provided by an appraiser. Factors considered in the valuation are projected cash flows for the loans, type of loan and related collateral, loan grade, delinquency, and loan to value. Loans are grouped together according to similar characteristics and are treated in the aggregate when applying various valuation techniques. Loans are first evaluated individually to determine if there has been credit deterioration since origination. Once acquired loans are determined to have deteriorated credit quality, the Company evaluates such loans for common risk characteristics and aggregation into one or more pools. Common risk characteristics for pooling acquired loans may include credit ratings, loan type, collateral type, delinquency status, geographic location, loan to value, or combinations thereof. Management also estimates the amount of credit losses that are expected to be realized for individual loans by estimating the probability of default and the loss given default, which incorporates the liquidation value of collateral securing loans. These estimates are subjective. The accretion of the fair value adjustments attributable to interest rates on loans acquired with deteriorated credit quality is recorded in interest income in the Consolidated Income Statements over the estimated life of the

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pool. The fair value adjustment attributable to credit losses on these loans is non-accretable. When a loan is sold, paid off or transferred to OREO and liquidated, any remaining non-accretable yield is recorded in interest income.

Adjustments to these loan values in future periods may occur based on management's expectation of future cash flows to be collected over the lives of the loans. Estimating cash flows is performed at a pool level and incorporates analysis of historical cash flows, delinquencies, and charge-offs as well as assumptions about future cash flows. Performance can vary from period to period, causing changes in estimates of the expected cash flows. If, based on the review of a pool of loans, it is probable that a significant increase or improvement in cash flows previously expected to be collected, any valuation allowance established for the pool of loans is first reduced for the increase in the present value of cash flows expected to be collected, and any remaining increase in estimated cash flows increases the accretable yield and is recognized over the remaining estimated life of the loan pool. If based on the review of a pool of loans, it is probable that a decrease or impairment in cash flows previously expected to be collected or if actual cash flows are less than cash flows previously expected, the allowance for credit losses is increased for the decrease in the present value of the cash flows expected to be collected.

Business Combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Income taxes

The Company’s income tax expense, deferred tax assets and liabilities, and liabilities for unrecognized tax benefits reflect management’s best estimate of current and future taxes to be paid. We are subject to federal and state income taxes in the United States. Significant judgments and estimates are required in the determination of the consolidated income tax expense.

Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements, which will result in taxable or deductible amounts in the future. In evaluating our ability to recover our deferred tax assets in the jurisdictions from which they arise, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. The assumptions about future taxable income require the use of significant judgment and are consistent with the plans and estimates used to manage the underlying business.

Liquidity

Liquidity is the ongoing ability to accommodate liability maturities and deposit withdrawals, fund asset growth and business operations, and meet contractual obligations through unconstrained access to funding at reasonable market rates. Liquidity management involves forecasting funding requirements and maintaining sufficient capacity to meet the needs and accommodate fluctuations in asset and liability levels due to changes in our business operations or unanticipated events.

The ability to have readily available funds sufficient to repay fully maturing liabilities is of primary importance to depositors, creditors, and regulators. Our liquidity, represented by cash and amounts due from banks, federal funds sold, and non-pledged marketable securities, is a result of our operating, investing, and financing activities and related cash flows. In order to ensure funds are available when necessary, on at least a quarterly basis, we project the amount of funds that will be required over a twelve month period and we strive to maintain relationships with a diversified customer base. Liquidity requirements can also be met through short-term borrowings or the disposition of short-term assets.

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The following table presents the available and outstanding balances of the Company's lines of credit:

	December 31, 2015
	Available Balance		Outstanding Balance
	(in millions)
Unsecured fed funds credit lines at correspondent banks	$	100.0	$	—
Other lines with correspondent banks:
Secured other lines with correspondent banks	25.0		—
Unsecured other lines with correspondent banks	45.0		—
Total other lines with correspondent banks	$	70.0	$	—

In addition to lines of credit, the Company has borrowing capacity with the FHLB and FRB from pledged loans and securities. The borrowing capacity, outstanding borrowings, and available credit as of December 31, 2015 are presented in the following table:

	December 31, 2015
	(in millions)
FHLB:
Borrowing capacity	$	1,994.9
Outstanding borrowings	150.0
Letters of credit	307.7
Total available credit	$	1,537.2
FRB:
Borrowing capacity	$	1,208.1
Outstanding borrowings	—
Total available credit	$	1,208.1

The Company has a formal liquidity policy and, in the opinion of management, our liquid assets are considered adequate to meet cash flow needs for loan funding and deposit cash withdrawals for the next 90-120 days. At December 31, 2015, there was $1.26 billion in liquid assets, comprised of $224.8 million in cash, cash equivalents, and money market investments and $1.04 billion in unpledged marketable securities. At December 31, 2014, the Company maintained $862.5 million in liquid assets, comprised of $165.3 million of cash, cash equivalents, and money market investments, and $697.2 million of unpledged marketable securities.

The Parent maintains liquidity that would be sufficient to fund its operations and certain non-bank affiliate operations for an extended period should funding from normal sources be disrupted. Since deposits are taken by WAB and not by the Parent, Parent liquidity is not dependent on the bank's deposit balances. In our analysis of Parent liquidity, we assume that the Parent is unable to generate funds from additional debt or equity issuances, receives no dividend income from subsidiaries and does not pay dividends to stockholders, while continuing to make nondiscretionary payments needed to maintain operations and repayment of contractual principal and interest payments owed by the Parent and affiliated companies. Under this scenario, the amount of time the Parent and its non-bank subsidiary can operate and meet all obligations before the current liquid assets are exhausted is considered as part of the Parent liquidity analysis. Management believes the Parent maintains adequate liquidity capacity to operate without additional funding from new sources for over twelve months.

WAB maintains sufficient funding capacity to address large increases in funding requirements, such as deposit outflows. This capacity is comprised of liquidity derived from a reduction in asset levels and various secured funding sources. On a long-term basis, the Company’s liquidity will be met by changing the relative distribution of our asset portfolios (for example, by reducing investment or loan volumes, or selling or encumbering assets). Further, the Company can increase liquidity by soliciting higher levels of deposit accounts through promotional activities and/or borrowing from correspondent banks, the FHLB of San Francisco, and the FRB. At December 31, 2015, our long-term liquidity needs primarily relate to funds required to support loan originations, commitments, and deposit withdrawals, which can be met by cash flows from investment payments and maturities, and investment sales, if necessary.

The Company’s liquidity is comprised of three primary classifications: 1) cash flows provided by operating activities; 2) cash flows used in investing activities; and 3) cash flows provided by financing activities. Net cash provided by or used in operating

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activities consists primarily of net income, adjusted for changes in certain other asset and liability accounts and certain non-cash income and expense items, such as the provision for credit losses, investment and other amortization and depreciation. For the years ended December 31, 2015, 2014, and 2013, net cash provided by operating activities was $212.8 million, $163.3 million, and $165.0 million, respectively.

Our primary investing activities are the origination of real estate and commercial loans, the collection of repayments of these loans, and the purchase and sale of securities. Our net cash provided by and used in investing activities has been primarily influenced by our loan and securities activities. The net increase in loans for the years ended December 31, 2015, 2014, and 2013, was $1.27 billion, $1.56 billion, and $728.8 million, respectively. There was a net increase in investment securities for the year ended December 31, 2015 of $420.2 million, compared to a net decrease of $187.0 million for the year ended December 31, 2014, and net increase of $451.1 million for the year ended December 31, 2013.

Net cash provided by financing activities has been impacted significantly by increased deposit levels. During the years ended December 31, 2015, 2014, and 2013, net deposits increased $1.36 billion, $1.09 billion, and $1.05 billion, respectively. Also, during the year ended December 31, 2015, WAB issued $150.0 million of subordinated debt, receiving proceeds of $148.2 million.

Fluctuations in core deposit levels may increase our need for liquidity as certificates of deposit mature or are withdrawn before maturity, and as non-maturity deposits, such as checking and savings account balances, are withdrawn. Additionally, we are exposed to the risk that customers with large deposit balances will withdraw all or a portion of such deposits, due in part to the FDIC limitations on the amount of insurance coverage provided to depositors. To mitigate the uninsured deposit risk, we have joined the CDARS and ICS programs, which allow an individual customer to invest up to $50.0 million and $110.0 million, respectively, through one participating financial institution or, a combined total of $150.0 million per individual customer, with the entire amount being covered by FDIC insurance. As of December 31, 2015, we had $517.5 million of CDARS and $714.4 million of ICS deposits.

As of December 31, 2015, we had $184.2 million of wholesale brokered deposits outstanding. Brokered deposits are generally considered to be deposits that have been received from a third party who is engaged in the business of placing deposits on behalf of others. A traditional deposit broker will direct deposits to the banking institution offering the highest interest rate available. Federal banking laws and regulations place restrictions on depository institutions regarding brokered deposits because of the general concern that these deposits are not relationship based and are at a greater risk of being withdrawn and placed on deposit at another institution offering a higher interest rate, thus posing liquidity risk for institutions that gather brokered deposits in significant amounts. There was also $365.6 million and $202.4 million of additional deposits as of December 31, 2015 and 2014, respectively, that the Company considers core deposits, but which are classified as brokered deposits for regulatory reporting purposes.

Federal and state banking regulations place certain restrictions on dividends paid. The total amount of dividends which may be paid at any date is generally limited to the retained earnings of the bank. Dividends paid by WAB to the Parent would be prohibited if the effect thereof would cause the bank’s capital to be reduced below applicable minimum capital requirements. WAB and LVSP paid dividends to the Parent in the amount of $132.0 million and $8.9 million, respectively, during the year ended December 31, 2015.

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings,and Disclosures. The amendments in ASU 2014-11 to Topic 860, Transfers and Servicing, change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The accounting changes are effective for the first interim or annual period beginning after December 15, 2014. The amendments also require disclosure of information about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. An entity will also be required to disclose information about repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014 and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

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In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In November 2015, the FASB issued guidance within ASU 2015-17, Income Taxes. The amendments in ASU 2015-17 to Topic 740, Income Taxes, changes the presentation of deferred income tax liabilities and assets, from previously bifurcated current and noncurrent, to a single noncurrent amount on the classified statement of financial position. The amendment is effective from the annual period ending after December 15, 2016, and for and interim periods within those annual periods. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In January 2016, the FASB issued guidance within ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, contain the following elements: 1) require equity investments to be measured at fair value with changes in fair value recognized in net income; 2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in OCI the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; 7) clarifies that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to AFS securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item 5) above, early adoption of the amendments in this Update is not permitted. See discussion in Recently adopted accounting guidance below for further discussion of the Company's election to early adopt this element of ASU 2016-01.

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Recently adopted accounting guidance

In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate CollateralizedConsumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.8 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs were not significant.

In the third quarter 2015, the Company elected early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. Under current GAAP, the acquirer is required to retrospectively adjust the provisional amounts recognized at the acquisition date with a corresponding adjustment to goodwill and is also required to revise comparative information for prior periods presented in the financial statements. The amendments in ASU 2015-16 to Topic 805, Business Combinations, require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this Update also require that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. An entity is required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. As a result of the adoption of this amended guidance, all measurement period adjustments identified during the quarter have been recognized in the current reporting period. As the closing date of the Bridge acquisition was June 30, 2015, Bridge's results of operations were not included in the Company's results until July 1, 2015. Accordingly, there are no amounts recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. See "Note 2. Mergers, Acquisitions and Dispositions" to the Consolidated Financial Statements for further discussion of the measurement period adjustments identified and recognized during the current reporting period.

In January 2016, and effective January 1, 2015, the Company elected early adoption of an element of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which relates to the accounting for changes in the fair value of its own liabilities when the fair value option for financial instruments has been elected. As mentioned above, under this portion of this amended standard, the portion of the total change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value is presented separately in other comprehensive income rather than being recognized in the income statement at each reporting period. As the Company's junior subordinated debt are variable rate instruments, that fair value movement relates to credit risk and therefore the fair value adjustment qualifies for presentation in other comprehensive income. See "Note 10. Qualifying Debt" to the Consolidated Financial Statements for additional detail on the impact that adoption has had on the current reporting period.

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SUPERVISION AND REGULATION

Bank holding companies and banks operate in an extensively regulated environment under state and federal law. These laws and regulations are intended primarily for the protection of depositors and the FDIC's DIF and not for the benefit of stockholders or creditors. The following discussion is only intended to summarize some of the significant statutes and regulations that affect the banking industry, and therefore is not a comprehensive survey of the statutory and regulatory landscape. These summaries are not intended to be complete and are qualified in their entirety by reference to the particular statute or regulation described. Moreover, the Dodd-Frank Wall Street Reform and Consumer Protection Act, or Dodd-Frank Act, and its implementing regulations have made multiple changes to the regulation, supervision, examination, and operation of financial institutions. These regulations have been in effect for only a limited time, and we cannot predict the long-term impact their implementation will have on capital, credit, and real estate markets or on our operations and activities.

Regulatory oversight of financial institutions, including banks and bank holding companies, has increased in recent periods. Regulators conduct a variety of evaluations, including compliance and safety and soundness examinations. As a result of these reviews, regulators may require that we change our practices or policies, write down assets or increase reserves (and therefore reduce our capital base), and take or omit to take other actions as deemed prudent by the regulator. Given the implementation of new laws and regulations, we cannot predict the outcome of future regulatory evaluations or whether we will become subject to conditions, policies, or directives resulting from regulatory evaluations.

The Dodd-Frank Wall Street Reform and Consumer Protection Act

As a result of the financial crisis, the U.S. Congress passed and, on July 21, 2010, President Obama signed the Dodd-Frank Act into law. The Dodd-Frank Act has had, and will continue to have, a broad impact on the financial services industry. The federal regulatory agencies have issued a number of requests for public comment, proposed rules, and final regulations to implement the requirements of the Dodd-Frank Act. The following items provide a brief description of the impact of the Dodd-Frank Act on the operations and activities, both currently and prospectively, of the Company and its subsidiaries.

Deposit Insurance. The Dodd-Frank Act and implementing final rules from the FDIC make permanent the $250,000 deposit insurance limit for insured deposits. The assessment base against which an insured depository institution’s deposit insurance premiums paid to the DIF are calculated has been revised to use the institution’s average consolidated total assets less its average equity rather than its deposit base. These provisions could increase the FDIC deposit insurance premiums paid by WAB. The FDIC has also proposed rules implementing a Dodd-Frank Act requirement to raise the DIF's reserve ratio from 1.15% to 1.35%. If finalized, these rules will likely increase deposit insurance assessments for banks with more than $10 billion in total consolidated assets, including WAB.

Increased Capital Standards. The federal banking agencies have issued rules to establish increased minimum leverage and risk-based capital requirements for banks and bank holding companies. Among other things, these capital requirements changed the types of securities and other instruments that bank holding companies are permitted to use as qualifying regulatory capital going forward and may have an impact on the nature and amount of capital we raise in the future, if any. Compliance with heightened capital standards also affects the revenue-producing assets we originate or hold, which could result in changes to our revenue generation from such assets.

State Enforcement of Consumer Financial Protection Laws. The Dodd-Frank Act created the CFPB, which is tasked with establishing and implementing rules and regulations under certain federal consumer protection laws.

The Dodd-Frank Act permits states to adopt consumer protection laws and regulations that are stricter than those regulations promulgated by the CFPB. State attorneys general are permitted to enforce consumer protection rules adopted by the CFPB against certain state-chartered institutions. Although we currently offer only limited consumer products or services, compliance with any such new regulations could increase our cost of operations and, as a result, could limit our ability to expand into these products and services.

Transactions with Affiliates and Insiders. The Dodd-Frank Act enhances the requirements for certain transactions with affiliates under Section 23A and 23B of the Federal Reserve Act, including an expansion of the definition of “covered transactions” and an increase in the amount of time for which collateral requirements regarding covered transactions must be maintained. Additionally, limitations on transactions with insiders are expanded through the strengthening on loan restrictions to insiders and the expansion of the types of transactions subject to the various limits, including derivative transactions, repurchase agreements, reverse repurchase agreements and securities lending or borrowing transactions. Restrictions are also placed on certain asset sales to and from an insider to an institution, including requirements that such sales be on market terms and, in certain circumstances, approved by the institution’s board of directors.

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Corporate Governance. The Dodd-Frank Act addresses many corporate governance and executive compensation matters that have affected or will affect most U.S. publicly-traded companies, including us. The Dodd-Frank Act: 1) grants stockholders of U.S. publicly-traded companies an advisory vote on executive compensation; 2) adds disclosure and voting requirements for golden parachute compensation that is payable to named executive officers in connection with sale transactions; 3) enhances independence requirements for compensation committee members; 4) requires compensation committees to select compensation consultants, counsel, or other advisers only after considering certain factors that affect their independence; 5) will require companies listed on national securities exchanges to adopt incentive-based compensation claw-back policies for executive officers; 6) will require U.S. publicly-traded companies to disclose information that shows the relationship between executive compensation and financial performance and the ratio of the compensation of the CEO to the median compensation of employees; 7) provides the SEC with authority to issue rules requiring companies to include stockholder nominees for director in their proxy materials and to adopt procedures for companies to comply with these new rules; and 8) imposes disclosure requirements and limitations on incentive compensation arrangements. The SEC has adopted final implementing rules regarding the stockholder advisory vote on compensation, golden parachute payments, compensation committee independence, compensation advisers, and CEO-to-median employee pay ratio disclosures. The SEC has also proposed rules on required recovery of executive compensation (clawbacks) and disclosures of pay for performance terms and employee and director hedging. The SEC also promulgated rules, which would have required public companies, under certain circumstances, to include stockholder-nominated candidates for director in their proxy statements. These proxy access rules were subsequently invalidated by a federal appeals court decision, though the SEC could propose new rules in the future. In addition, the SEC amended an existing rule, which is unaffected by the federal appeals court’s decision, that may require companies to include in their proxy materials stockholder proposals that seek to adopt procedures for including stockholder director nominees in future company proxy materials. In addition, six federal regulatory agencies published a proposed rule on disclosure and regulation of incentive-based compensation arrangements in 2011. The rule was never finalized and, although observers believed a final rule would be published in June 2015, it has not been forthcoming.

Although the Dodd-Frank Act contains some specific timelines for the Federal regulatory agencies to follow, in some instances, the agencies have been unable to meet these deadlines and it remains unclear when implementing rules will be proposed and finalized for some required rulemakings. We continue to monitor the rulemaking process and, while our current assessment is that the Dodd-Frank Act and the implementing regulations will not have a materially greater effect on us than the rest of the industry, given the uncertainty associated with the manner in which certain provisions of the Dodd-Frank Act will be implemented, and lack of clear understanding of the impact of those provisions that have been enacted on our operations, the full extent of the impact such requirements will have on our operations is unclear. The changes resulting from the Dodd-Frank Act may impact the profitability of our business activities, require changes to certain of our business practices, require new policies and procedures to comply with new requirements, impose upon us more stringent capital, liquidity, and leverage requirements or otherwise adversely affect our business.

These changes may also require us to invest significant management attention and resources to evaluate and make any changes necessary to comply with new statutory and regulatory requirements. As we now exceed $10 billion in total assets, the Company will need to comply with certain additional requirements (discussed below) created by the Dodd-Frank Act that apply only to bank holding companies and banks with $10 billion or more in total assets. Failure to comply with the new requirements will negatively impact our results of operations and financial condition. While we cannot predict what effect any presently contemplated or future changes in the laws or regulations or their interpretations would have on us, these changes could be materially adverse to our investors.

Bank Holding Company Regulation

General. WAL is a bank holding company, registered with the Board of Governors of the Federal Reserve or the Federal Reserve, under the BHCA. As such, the Federal Reserve is the Company’s primary federal regulator, and the Company is subject to extensive regulation, supervision, and examination by the Federal Reserve. The Company must file reports with the Federal Reserve and provide it with such additional information as it may require.

A bank holding company is required to serve as a source of financial and managerial strength for its subsidiary banks and may not conduct its operations in an unsafe or unsound manner. The Company must stand ready to use its available resources to provide adequate capital to its subsidiary bank during a period of financial stress or adversity and should maintain the financial flexibility and capital-raising capacity to obtain additional resources for assisting its subsidiary bank. Such support may be required at times when, absent this statutory requirement and the Federal Reserve’s policy, a bank holding company may not be inclined to provide it. The expectation to serve as a source of financial strength is in addition to certain guarantees required under the prompt corrective action provisions discussed below. A bank holding company’s failure to meet these obligations will generally be considered by the Federal Reserve to be an unsafe and unsound banking practice or a violation of Federal Reserve regulations, or both.

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Among its powers, the Federal Reserve may require a bank holding company to terminate an activity or terminate control of, divest or liquidate subsidiaries or affiliates that the Federal Reserve determines constitute a significant risk to the financial safety or soundness of the bank holding company or any of its bank subsidiaries. Subject to certain exceptions, bank holding companies also are required to give written notice to and receive approval from the Federal Reserve before purchasing or redeeming their common stock or other equity securities. The Federal Reserve also may regulate provisions of a bank holding company’s debt, including by imposing interest rate ceilings and reserve requirements. In addition, the Federal Reserve requires all bank holding companies to maintain capital at or above certain prescribed levels.

Other limitations on expansion were also implemented by the Dodd-Frank Act's amendments to the BHCA. These limits include, among other things, prohibitions on mergers or acquisitions if the resulting institution would own or control more than 10% of the aggregate consolidated liabilities of all U.S. financial companies - including both bank holding companies and non-bank financial companies.

Holding Company Bank Ownership. The BHCA requires every bank holding company to obtain the approval of the Federal Reserve before it may: 1) acquire, directly or indirectly, ownership or control of any voting shares of another bank or bank holding company if, after such acquisition, it would own or control more than 5% of any class of the outstanding voting shares of such other bank or bank holding company; 2) acquire all or substantially all the assets of another bank or bank holding company; or 3) merge or consolidate with another bank holding company. The BHCA further provides that the Federal Reserve may not approve any transaction that would result in a monopoly or would be in furtherance of any combination or conspiracy to monopolize or attempt to monopolize the business of banking in any area of the U.S., or the effect of which may be substantially to lessen competition or to tend to create a monopoly in any section of the country, or that in any other manner would be in restraint of trade, unless the anticompetitive effects of the proposed transaction are clearly outweighed by the public interest in meeting the convenience and needs of the community to be served. The Federal Reserve is also required to consider the financial and managerial resources and future prospects of the bank holding companies and banks concerned and the convenience and needs of the community to be served. Consideration of financial resources generally focuses on capital adequacy, and consideration of convenience and needs issues includes the parties’ performance under the CRA. In addition, the FRB must take into account an institution's effectiveness in combating money laundering.

Holding Company Non-bank Ownership. With certain exceptions, the BHCA prohibits a bank holding company from acquiring or retaining, directly or indirectly, ownership or control of more than 5% of the outstanding voting shares of any company that is not a bank or bank holding company, or from engaging, directly or indirectly, in activities other than those of banking, managing or controlling banks, or providing services for its subsidiaries. The principal exceptions to these prohibitions involve certain non-bank activities that have been identified, by statute or by Federal Reserve regulation or order, as activities so closely related to the business of banking or of managing or controlling banks as to be a proper incident thereto. Business activities that have been determined to be related to banking, and therefore appropriate for bank holding companies and their affiliates to engage in, include securities brokerage services, investment advisory services, fiduciary services, and certain management advisory and data processing services, among others.

Bank holding companies that qualify and elect to become financial holding companies may engage in a broader range of non-bank activities that have been identified by the GLBA, or by Federal Reserve and Treasury regulation, as financial in nature or incidental to a financial activity. The Federal Reserve may also determine that a financial holding company may engage in certain activities that are complementary to a financial activity. Activities that are defined as financial in nature include securities underwriting, dealing and market making, sponsoring mutual funds and investment companies, engaging in insurance underwriting and agency activities, and making merchant banking investments in non-financial companies. In order to become and remain a financial holding company, a bank holding company and its bank subsidiaries, must be well-capitalized, well-managed, and, except in limited circumstances, have at least satisfactory CRA ratings. A financial holding company must also file a certification with the Federal Reserve that all of its depository institution subsidiaries are well-capitalized and well-managed. If, after becoming a financial holding company and undertaking activities not permissible for a bank holding company, the company fails to continue to meet any of the prerequisites for financial holding company status, the company must enter into an agreement with the Federal Reserve to comply with all applicable capital and management requirements. If the company does not return to compliance within 180 days, the Federal Reserve may order the company to divest its subsidiary bank or the company may discontinue or divest investments in companies engaged in impermissible bank holding company activities. On March 30, 2009, the Company withdrew its election to be a financial holding company, and is now required to limit its activities to those permissible for a bank holding company.

Change in Control. In the event that the BHCA is not applicable to a person or entity, the Change in Bank Control Act of 1978 requires prior notice to the appropriate federal banking agency before any person or entity may acquire “control” of a bank or bank holding company. A limited number of exemptions apply to such transactions. Under the Change in Bank Control Act, control is deemed to exist if a person or entity acquires 25% or more of the outstanding shares of any class of voting stock of the bank holding company or insured depository institution. Control is presumed to exist, subject to rebuttal, if a person or

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entity acquires 10% or more but less than 25% of such voting stock and either the issuer has a class of registered securities under Section 12 of the Exchange Act, or no other person or entity will own, control or hold the power to vote a greater percentage of such voting stock immediately after the transaction. In some instances, such as when an investor is a private equity fund, the Federal Reserve may require information from an entity acquiring 5% or more of a class of voting securities of a bank or bank holding company.

The Federal Reserve has stated that generally, upon an investor's execution of certain commitments demonstrating than an investment in a bank or bank holding company is passive and non-controlling, it will be able to conclude that the investor does not have “control” of the bank or bank holding company if it does not own in excess of 15% of the voting power and 33% of the total equity of the relevant bank or bank holding company. Under this guidance, the Federal Reserve may permit the non-controlling investor to have up to two board seats if the investor’s aggregate board representation is proportionate to its total voting interest in the bank or bank holding company but does not exceed 25% of the voting members of the board and another stockholder of the bank or bank holding company controls the bank or bank holding company under the BHCA. The Federal Reserve has also set forth the terms of nonvoting equity securities it will deem to be voting securities and gives examples of other indicia of control beyond just equity ownership limits.

Prohibition on Propriety Trading and Certain Fund Relationships. On December 10, 2013, federal financial regulators released final rules implementing Section 619 of the Dodd-Frank Act, also known as the Volcker Rule, which prohibits both bank holding companies and banks from engaging in proprietary trading and from acquiring or retaining an ownership interest in, sponsoring, or having certain relationships with a hedge fund or private equity fund.

The final rules prohibit a banking entity from engaging in proprietary trading, defined as engaging as principal for the trading account of the banking entity in any purchase or sale of one or more financial instruments, including securities, derivatives, and futures contracts. Loans, non-derivative commodities, and foreign exchange or currency are not considered financial instruments. There are also several exemptions from the definition of proprietary trading, such as trading conducted 1) as part of a repurchase agreement; 2) as part of a liquidity management plan; 3) as part of a written securities lending agreement; 4) through deferred compensation, stock-bonus, profit-sharing, or pension plan of the banking entity; 5) in the ordinary course of collecting a debt; or 6) to satisfy existing delivery obligations in connection with judicial, administrative, self-regulatory, or arbitration proceedings.

Additionally, a banking entity may not, as principal, directly or indirectly acquire or retain any ownership interest in or sponsor a covered fund, including a hedge fund or private equity fund. Like the prohibition on proprietary trading, there are also several exemptions from the definition of covered fund, including, among other things, loan securitizations, joint ventures, certain types of foreign funds, entities issuing asset-backed commercial paper, and registered investment companies. Further, the final rules permit banking entities, subject to certain conditions and limitations, to invest in or sponsor a covered fund in connection with 1) organizing and offering the covered fund; 2) certain risk-mitigating hedging activities; and 3) de minimis investments in covered funds.

Under the Volcker Rule, the term "covered funds" is defined as any issuer that would be an investment company under the Investment Company Act but for the exemption in section 3(c)(1) or 3(c)(7) of that Act. Under this definition, investment vehicles selling securities backed by pools of trust preferred securities would be covered funds. In order to avoid the detrimental regulatory capital implications associated with that situation, federal financial regulatory agencies released an interim final rule on January 14, 2014 that permits a banking entity to retain an interest in, or act as sponsor of, an issuer so long as 1) the issuer was established before May 19, 2010; 2) the banking entity reasonably believes that the offering proceeds received by the issuer were invested primarily in any trust preferred security or subordinated debt instruments issued prior to May 19, 2010 by a holding company with less than $15 billion in total consolidated assets; and 3) the banking entity’s interest in the issuer was acquired on or before December 10, 2013 (unless acquired pursuant to a merger or acquisition).

Banking entities are expected to establish a compliance program as soon as practicable, but in no event later than July 21, 2015. Banking entities that do not engage in activities covered by the Volcker Rule are not required to develop a compliance program and such banking entities need only develop a compliance program before engaging in any such activities. Although the Volcker Rule became effective on July 21, 2012, it provided for a two-year conformance period to allow banking entities to wind down their prohibited trading operations and investments. After the Federal Reserve extended the conformance period for an additional year, the Volcker Rule became effective on July 21, 2015. For banks and bank holding companies with interests in legacy CLOs or legacy covered fund relationships (meaning interests in certain CLOs or relationships with covered funds where the interest or relationship was formed prior to December 31, 2013, the Federal Reserve has extended the conformance period until July 21, 2017.

Risk Committee and Risk Management Framework. Publicly-traded bank holding companies with $10 billion or more in total consolidated assets are required to establish a Board risk committee responsible for oversight of enterprise-wide risk

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management practices. The committee must be chaired by an independent director and include at least one member with experience in identifying, assessing, and managing risk exposures of large, complex firms. We passed $10 billion in total assets as of the quarter ending June 30, 2014 and, although compliance with this requirement did not begin until July 1, 2015, in anticipation of passing the $10 billion total assets threshold, we established a Board risk committee in April 2014.

In addition, publicly-traded bank holding companies with $10 billion or more in total consolidated assets are required to have a global risk management framework commensurate with their structure, risk profile, complexity, activities, and size. The risk management framework must include risk management policies and procedures, as well as processes and controls to implement them. The Company has adopted a compliant global risk management framework.

Stress Testing. Pursuant to the Dodd-Frank Act, any banking organization, including both a bank holding company and a depository institution, with more than $10 billion in total consolidated assets and regulated by a federal financial regulatory agency is required to conduct annual stress tests to ensure it has sufficient capital and liquidity during periods of economic downturn. The Federal Reserve and the FDIC release stress-test scenarios no later than February 15 of each year, and banking organizations are required to submit the results of their tests to the appropriate regulator by July 31 of the same year. The results of each year's stress tests are publicly disclosed in October, following each banking organization’s submission. A banking organization that crosses the $10 billion total consolidated assets threshold after March 31 of any given year must conduct its first annual company-run stress test in the second calendar year after the year in which it crossed the applicability threshold. We passed the $10 billion threshold after March 31, 2014, so our first annual stress test will occur in the first quarter of 2016 and will be submitted to the appropriate federal regulators by July 31, 2016. Public disclosure of the results is required by no later than October 31, 2016. Following the consolidation of our three subsidiary banks into a single bank charter, the vast majority of our assets are held in WAB. WAB’s total assets also passed $10 billion and we will be required to conduct stress tests at both the holding company and bank level.

State Law Restrictions. As a Delaware corporation, the Company is subject to certain limitations and restrictions under applicable Delaware corporate law. For example, Delaware law imposes restrictions relating to indemnification of directors, maintenance of books, records, and minutes, and observance of certain corporate formalities.

The Company is a bank holding company within the meaning of Arizona law. Under section 6-142 of the Arizona Revised Statutes, no person may acquire control of a company that controls an Arizona bank without the prior approval of the Arizona Superintendent of Financial Institutions, or Arizona Superintendent. A person who has the power to vote 15% or more of the voting stock of a controlling company is presumed to control the company.

Bank Regulation

General. WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance.

WAB was a state-chartered, non-member bank and was subject to regulation, supervision and examination at the federal level by the FDIC during 2014. On January 30, 2015, WAB became a member of the Federal Reserve System and now both WAL and WAB are regulated by the FRB. In addition, WAB is chartered in Arizona and is subject to supervision by the Arizona Department of Financial Institutions.

Federal and state banking laws and the implementing regulations promulgated by the federal and state banking regulatory agencies cover most aspects of the Bank's operations, including capital requirements, reserve requirements against deposits, and for possible loan losses and other contingencies, dividends, and other distributions to stockholders, customers’ interests in deposit accounts, payment of interest on certain deposits, permissible activities and investments, securities that a bank may issue, and borrowings that a bank may incur, rate of growth, number and location of branch offices, and acquisition and merger activity with other financial institutions. Also, certain provisions applicable to bank holding companies discussed above, such as the Change in Bank Control Act, the Volcker Rule and the annual stress testing requirements for institutions with total consolidated assets in excess of $10 billion, are also applicable to banks.

Deposit Insurance Assessments. Deposits in WAB are insured by the FDIC to applicable limits through the DIF. The Company’s subsidiary bank is required to pay deposit insurance premiums, which are generally assessed semiannually and paid quarterly. The FDIC utilizes a risk-based assessment system that imposes insurance premiums based upon a risk matrix that takes into account a bank’s capital level and supervisory rating. The risk matrix utilizes four risk categories which are

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distinguished by capital levels and supervisory ratings. As of September 30, 2015, WAB is classified as, and subject to the scorecard for, a large and highly complex institution, as discussed more fully below, to determine its total base assessment rate. Banks with higher levels of capital and a low degree of supervisory concern are assessed lower premiums than banks with lower levels of capital or a higher degree of supervisory concern.

The base for deposit insurance assessments is equal to average consolidated total assets during the assessment period less average tangible equity capital during the assessment period. The bank's average consolidated total assets and average tangible equity capital are defined in the schedule of quarterly averages in the Consolidated Reports of Condition and Income, commonly referred to as Call Reports, using a daily averaging method. For banking institutions with $10 billion or more in assets, the FDIC uses a method for calculating assessment rates based on scores for the bank's CAMELS rating, and two other scores for the bank's ability to withstand asset-related or funding-related stress. In addition, the FDIC has the ability to adjust a large bank's assessment depending on certain risk factors not captured in the three scores. The goal of the new pricing system is to raise assessment rates on larger banks with complex or high-risk operations.

On February 7, 2011, the FDIC approved a final rule to implement deposit insurance assessment changes called for under the Dodd-Frank Act. The final rate schedule went into effect on April 1, 2011. The deposit insurance initial base assessment rates currently range from 5 basis points (for a financial institution in Risk Category I) to 35 basis points (for financial institutions in Risk Category IV), but may be increased or decreased depending on certain base-rate adjustments. For banks with $10 billion or more in assets, the initial base assessment rate ranges from 5 to 35 basis points. After the effect of potential base-rate adjustments, the total base assessment rate could range from 2.5 to 45 basis points.

Once the reserve ratio reaches 1.15%, the rate schedule will shift downwards, with initial base assessment rates ranging from 3 basis points (for a Risk Category I institution) to 30 points (for a Risk Category IV institution). For banks with $10 billion or more in assets like WAB, the initial base rate ranges from 3 to 30 basis points, and the total base assessment rate could range from 1.5 to 40 basis points after the effect of potential base-rate adjustments. As of September 30, 2015, the DIF’s reserve ratio was 1.09%, and is expected to reach 1.15% in fourth quarter 2015 or first quarter 2016. In addition, the FDIC collects the FICO deposit assessments on assessable deposits. FICO assessments are set quarterly, and were set at 0.6 basis points for the first, second, and fourth quarter 2015 and 0.58 basis points for the third quarter 2015. The FICO assessment rate for the first quarter of 2016 is 0.58 basis points.

The Dodd-Frank Act also increased the minimum target DIF ratio from 1.15% of estimated insured deposits to 1.35% of estimated insured deposits. The FDIC must seek to achieve the 1.35% ratio by September 30, 2020. In setting the assessments necessary to achieve the 1.35% ratio, the FDIC is required to offset the effect of the increased ratio on insured institutions with assets of less than $10 billion. In October 2015, the FDIC issued a proposed rule to implement these requirements by imposing a deposit insurance assessment surcharge on insured depository institutions with assets of $10 billion or more and providing assessment credits to insured depository institutions with less than $10 billion in assets if the reserve ratio meets 1.40%. The surcharge would apply in the quarter after the reserve ratio reaches 1.15% and would be equal to an additional 1.125 basis points per quarter (4.5 basis points annually) on regular assessments. As mentioned above, as of September 30, 2015, the DIF’s reserve ratio was 1.09%, and is expected to reach 1.15% in fourth quarter 2015 or first quarter 2016. If the reserve ratio does not reach 1.35% by December 31, 2018 through use of the surcharge, the FDIC will impose an additional, one-time shortfall assessment on banks with more than $10 billion in assets on March 31, 2019, to be paid by June 30, 2019. If WAB remains over the $10 billion threshold it will be subject to the surcharge once the reserve ratio reaches 1.15%.

Supervision and Examination. Federal banking agencies have broad enforcement powers, including the power to terminate deposit insurance, impose substantial fines and other civil and criminal penalties, and appoint a conservator or receiver. If, as a result of an examination of a bank, the FRB were to determine that the financial condition, capital resources, asset quality, earnings prospects, management, liquidity or other aspects of any of the bank's operations had become unsatisfactory, or that the bank or its management was in violation of any law or regulation, the FRB may take a number of different remedial actions as it deems appropriate. These actions include the power to enjoin “unsafe or unsound” practices, to require affirmative actions to correct any conditions resulting from any violation or practice, to issue an administrative order that can be judicially enforced, to direct an increase in the bank’s capital, to restrict the bank’s growth, to assess civil monetary penalties against the bank’s officers or directors, and to remove officers and directors. If it is determined that such conditions cannot be corrected or there is an imminent risk of loss to depositors, the bank’s deposit insurance could be terminated.

The CFPB has examination authority over banks with more than $10 billion in total assets as it relates to compliance with the federal consumer financial protection laws. Included among these laws are new standards prohibiting any financial institution from providing consumer financial products and services in an unfair, deceptive or abusive manner. As WAB has now passed this $10 billion threshold, it will be subject to the examination of the CFPB with respect to its consumer products and services.

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Under Arizona law, the Arizona Department of Financial Institutions has many of the same remedial powers with respect to its state-chartered banks.

Debit Interchange Fees. Section 1075 of the Dodd-Frank Act, often referred to as the Durbin Amendment, amends the federal Electronic Fund Transfer Act to set standards for the pricing of interchange transaction fees on electronic debit transactions. The Durbin Amendment’s limitations on debit card interchange fees did not initially apply to the Company or WAB due to an exemption for debit card issuers which, together with their affiliates, parent companies, and subsidiaries have assets of less than $10 billion. However, since the Company's total consolidated assets now exceed $10 billion, WAB began complying with the restrictions on debit card interchange fees on July 1, 2015. Losing the exemption from the Durbin Amendment’s requirements negatively affected the amount of revenue we receive from debit card interchange fees. In 2015, we earned $1.4 million from debit card interchange fees, compared to $2.0 million in 2014.

Capital Standards

Regulatory Capital Guidelines. The Federal Reserve and the FDIC have risk-based capital adequacy guidelines intended to measure capital adequacy with regard to the degree of risk associated with a banking organization’s operations for transactions reported on the balance sheet as assets and transactions, such as letters of credit and recourse arrangements, that are reported as off-balance-sheet items. The Company and WAB are required to comply with these capital adequacy standards. Under these guidelines, the nominal dollar amounts of assets on the balance sheet and credit-equivalent amounts of off- balance-sheet items are multiplied by one of several risk adjustment percentages. In general, for most assets, these range from 0.0% for assets with very low credit risk, such as cash and certain U.S. government securities, to 100.0% for assets with relatively higher credit risk, such as business loans. Certain assets perceived as very risky, such as CDO securities and certain types of CRE loans, are weighted even higher. A banking organization’s risk-based capital ratios are obtained by dividing its Tier 1 capital and total qualifying capital (Tier 1 capital and a limited amount of Tier 2 capital) by its total risk-adjusted assets and certain off-balance-sheet items. Tier 1 capital consists of common stock, retained earnings, non-cumulative perpetual preferred stock, trust preferred securities up to a certain limit, and minority interests in certain subsidiaries, less most other intangible assets. Tier 2 capital consists of preferred stock not qualifying as Tier 1 capital, limited amounts of subordinated debt, other qualifying term debt, a limited amount of the allowance for loan and lease losses and certain other instruments that have some characteristics of equity. The inclusion of elements of Tier 2 capital as qualifying capital is subject to certain other requirements and limitations. Since December 31, 1992, to be considered adequately capitalized, the Federal Reserve and the FDIC have required a minimum ratio of Tier 1 capital to risk-adjusted assets and certain off-balance-sheet items of 4.0% and a minimum ratio of qualifying total capital to risk-adjusted assets and certain off-balance-sheet items of 8.0%.

The Federal Reserve and the FDIC require banking organizations to maintain a minimum amount of Tier 1 capital relative to average total assets, referred to as the leverage ratio. The principal objective of the leverage ratio is to constrain the maximum degree to which a banking organization may leverage its equity capital base. Effective January 1, 2015, all banking organizations are required to maintain a Tier 1 capital to average total assets ratio of 4.0%. The Federal Reserve and the FDIC have the discretion to set higher minimum capital requirements for specific institutions. Furthermore, the Federal Reserve has previously indicated that it may consider a “tangible Tier 1 capital leverage ratio” (thereby deducting all intangibles from Tier 1 capital) and other indicators of capital strength in evaluating proposals for expansion or new activities. The Company’s Tier 1 leverage ratio at December 31, 2015 was 9.8%. A bank that does not achieve and maintain the required capital levels may be issued a capital directive by the Federal Reserve or the FDIC, as appropriate, to ensure the maintenance of required capital levels.

The federal regulatory authorities’ risk-based capital guidelines are based upon the 1988 capital accord (“Basel I”) of the Basel Committee on Banking Supervision (the “Basel Committee”). The Basel Committee is a committee of central banks and bank supervisors/regulators from the major industrialized countries that develops broad policy guidelines for use by each country’s supervisors in determining the supervisory policies they apply. Since 2004, the Basel Committee has published several capital accords, the most recent of which was in 2010 referred to as Basel III, although many of the changes required by the Dodd-Frank Act have largely surpassed the regulatory requirements called for by Basel III. The Federal Reserve Board in July 2013 and the FDIC in September 2013 promulgated final rules implementing Basel III, providing for a strengthened set of capital requirements, as well as the risk-weighting approach under prior capital rules.

The capital framework under the Basel III final rule will replace the existing regulatory capital rules for all banks, savings associations, and U.S. bank holding companies with greater than $500 million in total assets, and all savings and loan holding companies. Effective on January 1, 2015 the final rules required:

• A ratio of common equity tier 1 capital to total risk-weighted assets of not less than 4.5%;

• A minimum leverage capital ratio of 4.0% for all banking organizations;

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• A minimum tier 1 risk-based capital ratio of 6.0%; and

• A minimum total risk-based capital ratio of 8.0%.

In addition, the new regulations subject a banking organization to certain limitations on capital distributions and discretionary bonus payments to executive officers if the organization did not maintain a capital conservation buffer of common equity tier 1 capital in an amount greater than 2.5% of its total risk-weighted assets. The effect of the capital conservation buffer will be to increase the minimum common equity tier 1 capital ratio to 7.0%, the minimum tier 1 risk-based capital ratio to 8.5% and the minimum total risk-based capital ratio to 10.5%.

The new regulations also change the capital categories for insured depository institutions for purposes of prompt corrective action as, discussed more fully below.

The final Basel III framework also requires banks and bank holding companies to measure their liquidity against specific liquidity tests. Although similar in some respects to liquidity measures historically applied by banks and regulators for management and supervisory purposes, the Basel III framework would require specific liquidity tests by rule. In October 2013, the Federal Reserve approved a proposed rule implementing the Basel III liquidity framework, which requires certain covered financial institutions to maintain a minimum amount of liquid assets to withstand a 30-day standardized supervisory liquidity stress scenario. In general, the new liquidity rules apply only to large, complex banking organizations, and would not include a bank or bank holding company with fewer than $50 billion in total consolidated assets.

Additionally, under the new regulations, the method for calculating the ratios has been revised to generally enhance risk sensitivity as well as provide alternatives to credit ratings for calculating risk-weighted assets. We are currently assessing the impact of the revised capital standards on WAB and the Company.

Trust Preferred Securities. Under the increased capital standards established by the Dodd-Frank Act, bank holding companies are prohibited from including in their regulatory Tier 1 capital hybrid debt and equity securities issued on or after May 19, 2010. Among the hybrid debt and equity securities included in this prohibition are trust preferred securities, which the Company has used in the past as a tool for raising additional Tier 1 capital and otherwise improving its regulatory capital ratios. Although the Company may continue to include our existing trust preferred securities as Tier 1 capital, the prohibition on the use of these securities as Tier 1 capital going forward may limit the Company’s ability to raise capital in the future.

Prompt Corrective Action. Federal banking agencies possess broad powers to take corrective and other supervisory action to resolve problems at insured depository institutions, including institutions that fall below one or more of the prescribed minimum capital ratios described above. The federal banking regulators are required to take “prompt corrective action” with respect to capital-deficient institutions. Further, an institution that is classified as "well-capitalized," "adequately capitalized," or "undercapitalized" based on its regulatory capital levels, may nonetheless be treated as though it was in the next lower capital category if its primary federal banking supervisory authority, after notice and opportunity for hearing, determines that an unsafe or unsound condition or practice warrants such treatment.

At each successively lower capital category, an insured depository institution is subject to additional restrictions. Also, a parent bank holding company of an undercapitalized bank must financially guarantee that a subsidiary bank that adopts a capital restoration plan will meet its plan obligations, in an amount not to exceed 5% of the subsidiary bank’s assets or the amount required to meet regulatory capital requirements, whichever is less. Any capital loans made by a bank holding company to a subsidiary bank are subordinated to the claims of depositors in the bank and to certain other indebtedness of the subsidiary bank. In the event of the bankruptcy of a bank holding company, any commitment by the bank holding company to a federal banking regulatory agency to maintain the capital of a subsidiary bank would be assumed by the bankruptcy trustee and would be entitled to priority of payment.

In addition to measures that may be taken under the prompt corrective action provisions, federal banking regulatory authorities may bring enforcement actions against banks and bank holding companies for unsafe or unsound practices in the conduct of their businesses or for violations of any law, rule or regulation, any condition imposed in writing by the appropriate federal banking regulatory authority or any written agreement with the authority. Possible enforcement actions include the appointment of a conservator or receiver, the issuance of a cease-and-desist order that could be judicially enforced, the termination of insurance of deposits (in the case of a depository institution), the imposition of civil money penalties, the issuance of directives to increase capital, the issuance of formal and informal agreements, including MOUs, the issuance of removal and prohibition orders against institution-affiliated parties and the enforcement of such actions through injunctions or restraining orders. In addition, a bank holding company’s inability to serve as a source of strength for its subsidiary banks could serve as an additional basis for a regulatory action against the bank holding company.

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As mentioned above, in July 2013, the Federal Reserve Board promulgated a final rule and the FDIC promulgated an interim final rule implementing Basel III, providing revised prompt corrective action ratios effective on January 1, 2015. Under the new regulations, certain changes to the prompt corrective action ratios have been implemented, including an increase in the Tier I risk-based capital ratios as follows:

• “Well capitalized” increased from 6% or greater to 8% or greater;

• “Adequately capitalized” increased from 4% or greater to 6% or greater;

• “Undercapitalized” increased from less than 4% to less than 6%; and

• “Significantly undercapitalized” increased from less than 3% to less than 4%.

Additionally, an institution’s common equity Tier I risk-based capital ratio would be required to be 6.5% or greater to be deemed “well capitalized,” 4.5% or greater to be considered “adequately capitalized,” less than 4.5% to be deemed “undercapitalized,” 3.0% or less to be deemed “significantly undercapitalized” and equal to or less than 2.0% to be deemed “critically undercapitalized.”

Dividends. The Company has never declared or paid cash dividends on its common stock. The Company currently intends to retain any future earnings for future growth and does not anticipate paying any cash dividends in the foreseeable future. Any determination in the future to pay dividends will be at the discretion of WAL's Board of Directors and will depend on the company’s earnings, financial condition, results of operations, business prospects, capital requirements, regulatory restrictions, contractual restrictions, and other factors that the Board of Directors may deem relevant.

The Company’s ability to pay dividends is subject to the regulatory authority of the Federal Reserve. The supervisory concern of the Federal Reserve focuses on a bank holding company’s capital position, its ability to meet its financial obligations as they come due, and its capacity to act as a source of financial strength to its subsidiaries. In addition, Federal Reserve policy discourages the payment of dividends by a bank holding company that are not supported by current operating earnings.

As a Delaware corporation, the Company is also subject to limitations under Delaware law on the payment of dividends. Under the Delaware General Corporation Law, dividends may only be paid out of surplus or out of net profits for the year in which the dividend is declared or the preceding year, and no dividends may be paid on common stock at any time during which the capital of outstanding preferred stock or preference stock exceeds our net assets.

From time to time, the Company may become a party to financing agreements and other contractual obligations that have the effect of limiting or prohibiting the declaration or payment of dividends such as the Series B Preferred Stock it issued pursuant to the SBLF. So long as the SBLF Preferred Stock remains outstanding, the Company may only declare and pay dividends on its common stock if: 1) SBLF Preferred Stock dividend payments are current, and 2) the Company’s Tier 1 capital following payment of the common stock dividend would remain at or above the applicable threshold provided in Schedule A of the Certificate of Designations for the SBLF Preferred Stock. Additional restrictions on common stock dividends apply if the Company does not timely pay dividends on the SBLF Preferred Stock. Holding company expenses and obligations with respect to its outstanding trust preferred securities and corresponding subordinated debt also may limit or impair the Company’s ability to declare and pay dividends.

Since the Company has no significant assets other than the voting stock of its subsidiaries, it currently depends on dividends from WAB and, to a lesser extent, its non-bank subsidiaries, for a substantial portion of its revenue and as the primary sources of its cash flow. The ability of a state bank to pay cash dividends is restricted by federal law or regulations. For example, under the Federal Deposit Insurance Corporation Act, an insured institution may not pay a dividend if payment would cause it to become undercapitalized or if it is already undercapitalized. Furthermore, the FDIC has issued a policy statement indicating that banks should generally pay dividends only out of current operating earnings.

Arizona law also imposes restrictions on the ability of WAB to pay dividends. Under section 6-187 of the Arizona Revised Statutes, WAB may pay dividends on the same basis as any other Arizona corporation, except that cash dividends paid out of capital surplus require the prior approval of the Arizona Superintendent. Under section 10-640 of the Arizona Revised Statutes, a corporation may not make a distribution to stockholders if to do so would render the corporation insolvent or unable to pay its debts as they become due. However, an Arizona bank may not declare a non-stock dividend out of capital surplus without the approval of the Arizona Superintendent.

Redemption. A bank holding company may not purchase or redeem its equity securities without the prior written approval of the Federal Reserve if the purchase or redemption combined with all other purchases and redemptions by the bank holding company during the preceding twelve months equals or exceeds 10% of the bank holding company’s consolidated net worth.

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However, prior approval is not required if the bank holding company is well-managed, not the subject of any unresolved supervisory issues, and both before and immediately after the purchase or redemption is well-capitalized.

Increasing Competition in Financial Services

The Dodd-Frank Act has established new standards for branching by out-of-state banks. Under the new standard, a bank may establish a de novo branch in any location in any state where a bank chartered in that state would be permitted to locate a branch.

Selected Regulation of Banking Activities

Transactions with Affiliates. Banks are subject to restrictions imposed by Sections 23A and 23B of Federal Reserve Act and regulations adopted by the Federal Reserve thereunder with regard to extensions of credit to affiliates, investments in securities issued by affiliates and the use of affiliates’ securities as collateral for loans to any borrower. Specifically, WAB may only engage in lending and other “covered transactions” with non-bank affiliates to the following extent: 1) in the case of any single such affiliate, the aggregate amount of covered transactions of the bank and its subsidiaries may not exceed 10% of the capital stock and surplus of the bank; and 2) in the case of all affiliates, the aggregate amount of covered transactions of the bank and its subsidiaries may not exceed 20% of the capital stock and surplus of the bank. Covered transactions are also subject to certain collateralization requirements. “Covered transactions” are defined by statute to include a loan or extension of credit, as well as a purchase of securities issued by an affiliate, a purchase of assets (unless otherwise exempted by the Federal Reserve) from the affiliate, the acceptance of securities issued by the affiliate as collateral for a loan, and the issuance of a guarantee, acceptance or letter of credit on behalf of an affiliate. The Dodd-Frank Act has expanded the definition of covered transactions and increased the timing and other aspects of the collateral requirements associated with covered transactions. All covered transactions, including certain additional transactions (such as transactions with a third party in which an affiliate has a financial interest), must be conducted on prevailing market terms and on terms substantially the same, or at least as favorable to the bank, as those prevailing at that time for comparable transactions with or involving non-affiliated persons. These laws and regulations may limit the ability of the Company to obtain funds from WAB for its cash needs, including funds for payment of dividends, interest, and operational expenses.

Insider Credit Transactions. Banks also are subject to certain restrictions regarding extensions of credit to executive officers, directors, or principal stockholders of a bank and its affiliates or to any related interests of such persons (i.e., insiders). All extensions of credit to insiders must be made on substantially the same terms and pursuant to the same credit underwriting procedures as are applicable to comparable transactions with persons who are neither insiders nor employees, and must not involve more than the normal risk of repayment or present other unfavorable features. Insider loans also are subject to certain lending limits, restrictions on overdrafts to insiders, and requirements for prior approval by the bank’s board of directors. In addition to enhancing restrictions on insider transactions, the Dodd-Frank Act increases the types of transactions with insiders subject to these restrictions, including certain asset sales with insiders.

Lending Limits. In addition to the limits set forth above, state banking law generally limits the amount of funds that a bank may lend to a single borrower. Under Arizona law, the obligations of one borrower to a bank may not exceed 20% of the bank’s capital, plus an additional 10% of its capital if the additional amounts are fully secured by readily marketable collateral.

Banking Agency Loan Guidance. In December 2006, the Federal Reserve, FDIC, and other federal banking agencies issued final guidance on sound risk management practices for concentrations in CRE, or CRE lending. The CRE guidance provided supervisory criteria, including numerical indicators to direct examiners in identifying institutions with potentially significant CRE loan concentrations that may warrant greater supervisory scrutiny. The CRE criteria do not constitute limits on CRE lending, but the CRE guidance does provide certain additional expectations, such as enhanced risk management practices and levels of capital, for banks with concentrations in CRE lending. The FDIC issued additional guidance in March 2008 reinforcing the 2006 guidance and addressing steps institutions with potentially significant CRE concentrations should take to reduce or mitigate the risk of the concentration.

During 2007, the Federal Reserve, FDIC, and other federal banking agencies issued final guidance on subprime mortgage lending to address issues relating to certain subprime mortgages, especially adjustable-rate mortgage products that can cause payment shock. The subprime guidance described the prudent safety and soundness and consumer protection standards that the regulators expect banks and financial institutions to follow to ensure borrowers obtain loans they can afford to repay.

In December 2015, the federal banking agencies released a statement noting that CRE asset and lending markets are experiencing growth. The banking agencies stated they had identified certain risk management trends among underwriting policy exceptions and CRE concentration risk monitoring that have caused concern and encouraged financial institutions active in the CRE market to review their risk management practices, capital levels, and underwriting policies. The banking agencies

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noted that supervisors would continue to pay special attention to risks associated with CRE lending, including whether an institution has implemented the principles described in their 2006 CRE guidance.

Tying Arrangements. The Company and its subsidiary bank are prohibited from engaging in certain tying arrangements in connection with any extension of credit, sale or lease of property or furnishing of services. With certain exceptions for traditional banking services, the Company’s subsidiary bank may not condition an extension of credit to a customer on a requirement that the customer obtain additional credit, property, or services from the bank, the Company or any of its other subsidiaries, that the customer provide some additional credit, property, or services to the bank, the Company or any of the Company’s other subsidiaries or that the customer refrain from obtaining credit, property, or other services from a competitor.

Regulation of Management. Federal law sets forth circumstances under which officers or directors of a bank or bank holding company may be removed by the institution’s primary federal banking supervisory authority. Federal law also prohibits a management official of a bank or bank holding company from serving as a management official with an unaffiliated bank or bank holding company that has offices within a specified geographic area that is related to the location of the bank’s offices and the asset size of the institutions.

Safety and Soundness Standards. Federal law imposes upon banks certain non-capital safety and soundness standards. The federal banking agencies have issued joint guidelines for safe and sound banking operations. These standards cover internal controls, information systems, internal audit systems, loan documentation, credit underwriting, interest rate risk exposure, earnings asset growth, compensation, and benefits. Additional standards apply to asset quality, earnings, and stock valuation. An institution that fails to meet these standards must develop a plan, acceptable to its regulators, specifying the steps that the institution will take to meet the standards. Failure to submit or implement such a plan may subject the institution to regulatory sanctions.

Risk Retention for Asset-Backed Securities. In October 2014, six federal agencies approved a final rule requiring securitization sponsors to retain risk in those transactions. Generally, the rule requires a securitizer of ABSs to retain not less than 5% of the credit risk of the assets collateralizing the ABS issuance. For residential mortgage securitizations, the final rule provides an exemption for a securitization that is collateralized entirely by mortgages that meet the definition of a QRM. The final rule defines a QRM as any mortgage the meets the definition of “qualified mortgage” under the CFPB’s Ability to Repay rule, discussed under Predatory Lending below.

Consumer Protection Laws and Regulations

The bank regulatory authorities have increased their attention in recent years on compliance with the consumer protection laws and their implementing regulations. Examination and enforcement activities have become more intense in nature, and insured institutions have been advised to monitor carefully their compliance with such laws and regulations. Banks are subject to many federal consumer protection statutes and regulations, some of which are discussed below. The Dodd-Frank Act created the CFPB which has rulemaking and oversight authority over most federal consumer financial protection laws, as well as significant interpretive and enforcement authority with respect to those laws. In accordance with this authority, the CFPB transferred many of the regulations formerly administered by the Federal Reserve and the U.S. Department of Housing and Urban Development, to a new chapter of Title 12 of the Code of Federal Regulations maintained by the CFPB, many of which deal with consumer credit, account disclosures and residential mortgage lending. Although the CFPB did not make significant or substantive changes to the rules as part of this transfer, it now has authority to promulgate guidance and interpretations of, and otherwise enforce, these rules and regulations in a manner that could differ from prior interpretations or enforcement of the other federal regulatory bodies.

Community Reinvestment Act. The CRA and its implementing regulations are intended to encourage insured depository institutions, while operating safely and soundly, to help meet the credit needs of their communities. The CRA specifically directs the federal regulatory agencies, when examining insured depository institutions, to assess a bank’s record of helping meet the credit needs of its entire community, including low- and moderate-income neighborhoods, consistent with safe and sound banking practices. The CRA further requires the agencies to take a financial institution’s record of meeting its community credit needs into account when evaluating applications for, among other things, domestic branches, mergers or acquisitions, and holding company formations. A CRA rating other than “outstanding” or “satisfactory” can substantially delay or block a transaction. Based upon its most recent CRA examination dated October 15, 2013, WAB received a rating of “satisfactory.”

Equal Credit Opportunity Act. The Equal Credit Opportunity Act generally prohibits discrimination in any aspect of a credit transaction, whether for consumer or business purposes, on the basis of race, color, religion, national origin, sex, marital status, age (except in limited circumstances), receipt of income from public assistance programs, or good faith exercise of any rights under the Consumer Credit Protection Act. Federal agencies interpret this law to prohibit, in certain circumstances, facially neutral credit policies that have a disparate impact on one or more groups of consumers.

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Truth in Lending Act. The TILA is designed to ensure that credit terms are disclosed in a meaningful way so that consumers may compare credit terms more readily and knowledgeably. Under TILA, all creditors must use the same credit terminology to express rates and payments, including the annual percentage rate, the finance charge, the amount financed, the total of payments and the payment schedule, among other things. In November 2013, the CFPB finalized rules revising the disclosures required to be given to residential mortgage borrowers under TILA and RESPA. The new TRID instead of the prior Good Faith Estimate and HUD-1 forms, lenders will be required to provide the new Loan Estimate and Closing Disclosure forms. These requirements became effective in October 2015.

Fair Housing Act. The FHA regulates many practices, and makes it unlawful for any lender to discriminate in its housing-related lending activities against any person because of race, color, religion, national origin, sex, handicap or familial status. A number of lending practices have been found by regulators and/or courts to be illegal under the FHA, including some practices that are not specifically mentioned in the FHA.

Home Mortgage Disclosure Act. The HMDA grew out of public concern over credit shortages in certain urban neighborhoods and provides public information that is intended to help to show whether financial institutions are serving the housing credit needs of the neighborhoods and communities in which they are located. The HMDA also includes a “fair lending” aspect that requires the collection and disclosure of data about applicant and borrower characteristics as a way of identifying possible discriminatory lending patterns and enforcing anti-discrimination statutes. Beginning with data reported for 2005, the amount of information that financial institutions collect and disclose concerning applicants and borrowers has expanded, which has increased the attention that HMDA data receives from state and federal banking supervisory authorities, community-oriented organizations and the general public.

Real Estate Settlement Procedures Act. The RESPA requires lenders to provide borrowers with disclosures regarding the nature and cost of real estate settlements. RESPA also prohibits certain practices perceived as abusive, such as kickbacks and fee-splitting under certain circumstances.

Penalties under the above laws may include fines, reimbursements, and other penalties. Violation or inadequate compliance management also can result in one or more of the enforcement actions described above and could restrict the ability of a bank to engage in certain activities or transactions, such as mergers and acquisitions. Due to heightened regulatory concern related to compliance with these laws generally, the Company and its subsidiary bank may incur additional compliance costs or be required to expend additional funds for investments in its local community.

Predatory Lending. “Predatory lending” is a far-reaching concept and potentially covers a broad range of behavior. As such, it does not lend itself to a concise or comprehensive definition. However, predatory lending typically involves one or more of the following elements:

• making unaffordable loans based on the borrower’s assets rather than the borrower’s ability to repay an obligation;

• inducing a borrower to refinance a loan repeatedly in order to charge high points and fees each time the loan is refinanced, or “loan flipping”; and

• engaging in fraud or deception to conceal the true nature of the loan obligation from an unsuspecting or unsophisticated borrower.

The HOEPA and regulations adopted by the Federal Reserve thereunder require certain disclosures and extend additional protection to borrowers in closed end consumer credit transactions, such as home repairs or renovation, that are secured by a mortgage on the borrower’s primary residence. The HOEPA disclosures and protections are applicable to such “high cost” transactions with any of the following features:

• APR: The APR for first lien mortgage loans more than eight percentage points above the yield on U.S. Treasury securities having a comparable maturity or 10 percentage points on a subordinate lien mortgage loan; and

• Points and Fees: The total points and fees paid in connection with the credit transaction exceed the greater of either 8% of the loan amount or a specified dollar amount that is inflation-adjusted each year.

Under regulations effective on January 10, 2014, the CFPB revised these thresholds as follows:

• APR: The APR threshold is reduced to 6.5 percentage points on a first lien mortgage loan and 8.5 percentage points on a subordinate lien mortgage loan;

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• Points and Fees: The points and fees threshold is reduced to 5% of the total loan amount for a loan of $20,000 or more, or the lesser of 8% or a $1,000 for a loan under $20,000. The $20,000 and $1,000 amounts will be adjusted annually for inflation; and

• Prepayment Penalty: The new regulations add a third prepayment penalty threshold. A mortgage loan may also be a high cost transaction where a prepayment penalty 1) may be charged more than 36 months after consummation or account opening, or 2) is in an amount more than 2% of the amount prepaid.

In December 2008, the Federal Reserve issued rules under HOEPA in order to address certain practices in the subprime mortgage market. The proposed rules would require disclosures and additional protections or prohibitions on practices connected with “higher-priced mortgages,” including requiring creditors to verify a borrower’s income and assets, make a determination that the borrower had the ability to repay, prior to extending a higher-priced mortgage, and establish escrow accounts for property taxes and insurance. The FRB's rules defined a higher-priced mortgage as a closed-end loan secured by a consumer’s principal dwelling and with an interest rate exceeding the yield on comparable U.S. Treasury securities by at least 3 percentage points for first-lien loans, or 5 percentage points for subordinate-lien loans. Effective January 14, 2014, the CFPB revised these amounts to 1.5 percentage points for a first lien loan or 3.5% for a subordinate lien loan. In addition to existing protections, these regulations require a creditor extending a higher-priced mortgage to obtain one or more appraisals meeting certain specified standards, provide applicants with a notification regarding the use of the appraisals, and give applicants a copy of the written appraisals used.

In addition, the CFPB expanded the requirement that creditors verify a borrower's income and assets, and make a determination of the borrower’s ability to repay, to nearly all closed-end loans secured by a borrower’s principal residence. Failure to make such a determination provides a borrower with a defense to foreclosure by way of set off or recoupment equal to the sum of all finance charges and fees paid by the borrower, as well as actual damages, court costs, and attorney fees. A creditor is not required to make such a determination where the mortgage meets certain statutory requirements to be considered a “qualified mortgage.” A mortgage loan will be considered a qualified mortgage where it is sold to Fannie Mae or Freddie Mac, or where it meets certain requirements, including a debt-to-income ratio of 43% or less and limits on points and fees. These requirements became effective on January 10, 2014.

Privacy. Under the GLBA, all financial institutions, including the Company, WAB and certain of their non-banking affiliates and subsidiaries, are required to establish policies and procedures to restrict the sharing of non-public customer data with non-affiliated parties at the customer’s request and to protect customer data from unauthorized access. In addition, the FCRA includes many provisions concerning national credit reporting standards and permits consumers, including customers of our subsidiary bank, to opt out of information-sharing for marketing purposes among affiliated companies. The Fair and Accurate Credit Transactions Act of 2004 amended certain provisions of the FRCA, and requires banks and other financial institutions to notify their customers if they report negative information about them to a credit bureau or if they are granted credit on terms less favorable than those generally available. The CFPB has extensive rulemaking authority under the FCRA, and the Company and WAB are subject to these provisions. We have developed policies and procedures for the Company and WAB to maintain compliance and believe they are in compliance with all privacy, information sharing and notification provisions of the GLBA and the FCRA.

Under California law, every business that owns or licenses personal information about a California resident must maintain reasonable security procedures and policies to protect that information. All customer records that contain personal information and that are no longer required to be retained must be destroyed. Any person that conducts business in California, maintains customers’ personal information in unencrypted computer records and experiences a breach of security with regard to those records must promptly disclose the breach to all California residents whose personal information was or is reasonably believed to have been acquired by unauthorized persons as a result of such breach. Any person who maintains computerized personal data for others and experiences a breach of security must promptly inform the owner or licensee of the breach. A business may not provide personal information of its customers to third parties for direct mailing purposes unless the customer “opts in” to such information sharing. A business that fails to provide this privilege to its customers must report the uses made of its customers’ data upon a customer’s request. Other states, including Arizona and Nevada where WAB has branch offices, may also have applicable laws requiring businesses that retain consumer personal information to develop reasonable security policies and procedures, notify consumers of a security breach, or provide disclosures about the use and sharing of consumer personal information.

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Compliance

In order to assure that the Company and WAB are in compliance with the laws and regulations that apply to their operations, including those summarized herein, the Company and its subsidiary bank employ compliance and risk management staff. The Company is regularly examined by their respective state and federal banking agencies, as part of which their compliance with applicable laws and regulations is assessed.

In April of 2014, the Company formed a Board level risk committee to approve and periodically review the Company’s risk management policies and oversee operations of our risk management framework. The risk committee has a formal, written charter approved by the BOD. The committee meets at a minimum of four times per year, or more frequently if necessary, and maintains records of its proceedings and risk management decisions. The risk committee includes at least one director with experience in identifying, assessing, and managing risk exposures of large, complex firms and is chaired by an independent director that is not an employee of the Company, and has not been an employee for at least three years.

Corporate Governance and Accounting Legislation

Sarbanes-Oxley Act of 2002. SOX was adopted for the stated purpose of increasing corporate responsibility, enhancing penalties for accounting and auditing improprieties at publicly-traded companies, and protecting investors by improving the accuracy and reliability of corporate disclosures pursuant to the securities laws. It applies generally to all companies that file or are required to file periodic reports with the SEC under the Exchange Act, which includes the Company. Under SOX, the SEC and securities exchanges adopted extensive additional disclosure, corporate governance, and other related rules. Among its provisions, SOX subjects bonuses issued to top executives to disgorgement if a subsequent restatement of a company’s financial statements was due to corporate misconduct, prohibits an officer or director from misleading or coercing an auditor, prohibits insider trades during pension fund “blackout periods,” imposes new criminal penalties for fraud and other wrongful acts, and extends the period during which certain securities fraud lawsuits can be brought against a company or its officers.

Anti-Money Laundering and Anti-Terrorism Legislation

Congress enacted the BSA to require financial institutions, including the Company and its subsidiary bank, to maintain certain records and to report certain transactions to prevent such institutions from being used to hide money derived from criminal activity and tax evasion. The BSA establishes, among other things: 1) record keeping requirements to assist government enforcement agencies in tracing financial transactions and flow of funds; 2) reporting requirements for Suspicious Activity Reports and Currency Transaction Reports to assist government enforcement agencies in detecting patterns of criminal activity; 3) enforcement provisions authorizing criminal and civil penalties for illegal activities and violations of the BSA and its implementing regulations; and 4) safe harbor provisions that protect financial institutions from civil liability for their cooperative efforts. The intensity of regulatory scrutiny of BSA compliance and the severity of penalties for violations of the BSA has increased substantially in recent years.

Title III of the USA PATRIOT Act of 2001 amended the BSA and incorporates anti-terrorist financing provisions into the requirements of the BSA and its implementing regulations. Among other things, the USA PATRIOT Act requires all financial institutions, including the Company, its subsidiary bank, and several of their non-banking affiliates and subsidiaries, to institute and maintain a risk-based anti-money laundering compliance program that includes a customer identification program, provides for information sharing with law enforcement and between certain financial institutions by means of an exemption from the privacy provisions of the GLBA, prohibits U.S. banks and broker-dealers from maintaining accounts with foreign “shell” banks, establishes enhanced due diligence requirements for certain foreign correspondent banking and foreign private banking accounts, and imposes additional record keeping requirements for certain correspondent banking arrangements. The USA PATRIOT Act also grants broad authority to the Secretary of the Treasury to take actions to combat money laundering, and federal bank regulators are required to evaluate the effectiveness of an applicant in combating money laundering in determining whether to approve any application submitted by a financial institution. The Company and its affiliates have adopted policies, procedures and controls that are designed to comply with the BSA and the USA PATRIOT Act, and they engage in relatively few transactions of any kind with foreign financial institutions or foreign persons.

The Treasury’s OFAC administers and enforces economic and trade sanctions against targeted foreign countries, entities and individuals based on U.S. foreign policy and national security goals. As a result, all U.S. Companies, including the Company, its affiliates and subsidiaries, must scrutinize transactions to ensure that they do not represent obligations of, or ownership interests in, entities owned or controlled by sanctioned targets. In addition, the Company and WAB must restrict transactions with certain targeted countries except as permitted by OFAC.

79

Regulatory Reform

As noted elsewhere in this Form 10-K, the requirements of the Dodd-Frank Act call for a number of rulemakings, studies, and regulatory guidance from Federal regulators. The Company and WAB continue to monitor this ongoing regulatory process to determine the level of impact that it will have on its operations and activities.

Although the Dodd-Frank Act contains some specific timelines for the Federal regulatory agencies to follow, in some instances, the agencies have been unable to meet these deadlines and it remains unclear when implementing rules will be proposed and finalized. While our current assessment is that the Dodd-Frank Act and its implementing regulations will not have a materially greater effect on the Company than the rest of the commercial banking industry, given the uncertainty associated with the manner in which the provisions of the Dodd-Frank Act will be implemented, the full extent of the impact such requirements will have on our operations is unclear. The changes resulting from the Dodd-Frank Act may impact the profitability of our business activities, require changes to certain of our business practices, impose upon us more stringent capital, liquidity, and leverage requirements or otherwise adversely affect our business. These changes may also require us to invest significant management attention and resources to evaluate and make any changes necessary to comply with new statutory and regulatory requirements as we continue to grow. As we now exceed $10 billion in total assets, the Company will need to comply with certain additional requirements created by the Dodd-Frank Act that apply only to bank holding companies and banks with $10 billion or more in total assets. For more information, see “The Dodd-Frank Wall Street Reform and Consumer Protection Act,” discussed above. Failure to comply with the new requirements would negatively impact our results of operations and financial condition. While we cannot predict what effect any presently contemplated or future changes in the laws or regulations or their interpretations would have on us, these changes could be materially adverse to our investors. 

Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

Market risk is the risk of loss in a financial instrument arising from adverse changes in market prices and rates, foreign currency exchange rates, commodity prices, and equity prices. Our market risk arises primarily from interest rate risk inherent in our lending, investing, and deposit taking activities. To that end, management actively monitors and manages our interest rate risk exposure. We generally manage our interest rate sensitivity by evaluating re-pricing opportunities on our earning assets to those on our funding liabilities.

Management uses various asset/liability strategies to manage the re-pricing characteristics of our assets and liabilities, all of which are designed to ensure that exposure to interest rate fluctuations is limited to within our guidelines of acceptable levels of risk-taking. Hedging strategies, including the terms and pricing of loans and deposits and management of the deployment of our securities, are used to reduce mismatches in interest rate re-pricing opportunities of portfolio assets and their funding sources.

Interest rate risk is addressed by the ALCO, which includes members of executive management, finance, and operations. ALCO monitors interest rate risk by analyzing the potential impact on the net EVE and net interest income from potential changes in interest rates and considers the impact of alternative strategies or changes in balance sheet structure. We manage our balance sheet in part to maintain the potential impact on EVE and net interest income within acceptable ranges despite changes in interest rates.

Our exposure to interest rate risk is reviewed at least quarterly by the ALCO. Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in both EVE and net interest income in the event of hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the Bank’s BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within Board-approved limits.

Net Interest Income Simulation. In order to measure interest rate risk at December 31, 2015, we used a simulation model to project changes in net interest income that result from forecasted changes in interest rates. This analysis, which includes Bridge, calculates the difference between a baseline net interest income forecast using current yield curves that do not take into consideration any future anticipated rate hikes, compared to forecasted net income resulting from an immediate parallel shift in rates upward or downward, along with other scenarios directed by ALCO. The income simulation model includes various assumptions regarding the re-pricing relationships for each of our products. Many of our assets are floating rate loans, which are assumed to re-price immediately and, proportional to the change in market rates, depending on their contracted index. Some loans and investments contain contractual prepayment features (embedded options) and, accordingly, the simulation model incorporates prepayment assumptions. Our non-term deposit products re-price more slowly, usually changing less than the change in market rates and at our discretion.

This analysis indicates the impact of changes in net interest income for the given set of rate changes and assumptions. It assumes the balance sheet remains static and that its structure does not change over the course of the year. It does not account

80

for all factors that could impact our results, including changes by management to mitigate interest rate changes or secondary factors such as changes to our credit risk profile as interest rates change.

Furthermore, loan prepayment rate estimates and spread relationships change regularly. Interest rate changes create changes in actual loan prepayment speeds that will differ from the market estimates incorporated in this analysis. Changes that vary significantly from the modeled assumptions may have significant effects on our actual net interest income.

This simulation model assesses the changes in net interest income that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates. At December 31, 2015, our net interest income exposure for the next twelve months related to these hypothetical changes in market interest rates was within our current guidelines.

Sensitivity of Net Interest Income

	Interest Rate Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200			Up 300			Up 400
	(in thousands)
Interest Income	$	597,897		$	609,226	$	667,839		$	731,593		$	797,059		$	862,917
Interest Expense	31,589			31,970		62,409			92,929			123,388			153,800
Net Interest Income	566,308			577,256		605,430			638,664			673,671			709,117
% Change	(1.9		)%			4.9		%	10.6		%	16.7		%	22.8		%

Economic Value of Equity. We measure the impact of market interest rate changes on the NPV of estimated cash flows from our assets, liabilities, and off-balance sheet items, defined as EVE, using a simulation model. This simulation model, which includes Bridge, assesses the changes in the market value of interest rate sensitive financial instruments that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates.

At December 31, 2015, our EVE exposure related to these hypothetical changes in market interest rates was within the current guidelines established by us. The following table shows our projected change in EVE for this set of rate shocks at December 31, 2015:

Economic Value of Equity

	Interest Rate Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200			Up 300			Up 400
	(in thousands)
Assets	$	14,217		$	14,025	$	13,779		$	13,534		$	13,301		$	13,077
Liabilities	11,900			11,542		11,247			10,984			10,743			10,520
Net Present Value	2,317			2,483		2,532			2,550			2,558			2,557
% Change	(6.7		)%			2.0		%	2.7		%	3.0		%	3.0		%

The computation of prospective effects of hypothetical interest rate changes are based on numerous assumptions, including relative levels of market interest rates, asset prepayments, and deposit decay, and should not be relied upon as indicative of actual results. Further, the computations do not contemplate any actions we may undertake in response to changes in interest rates. Actual amounts may differ from the projections set forth above should market conditions vary from the underlying assumptions.

Derivative Contracts. In the normal course of business, the Company uses derivative instruments to meet the needs of its customers and manage exposure to fluctuations in interest rates. The following table summarizes the aggregate notional amounts, market values, and terms of the Company’s derivative positions as of December 31, 2015 and 2014:

Outstanding Derivatives Positions

December 31, 2015						December 31, 2014
Notional		Net Value			Weighted Average Term (Years)	Notional		Net Value			Weighted Average Term (Years)
(dollars in thousands)
$	800,478	$	(61,216	)	14.5	$	647,703	$	(57,813	)	17.6

81

Item 8. Financial Statements and Supplementary Data

Our Consolidated Financial Statements and Supplementary Data included in this Annual Report is immediately following the Index to Consolidated Financial Statements page to this Annual Report.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	PAGE
Report of Independent Registered Public Accounting Firm	83
Consolidated Balance Sheets	84
Consolidated Income Statements	85
Consolidated Statements of Comprehensive Income	87
Consolidated Statements of Stockholders’ Equity	88
Consolidated Statements of Cash Flows	89
Notes to Consolidated Financial Statements	91

82

RSM US LLP

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders

Western Alliance Bancorporation

We have audited the accompanying Consolidated Balance Sheets of Western Alliance Bancorporation and Subsidiaries (collectively referred to herein as the Company) as of December 31, 2015 and 2014, and the related Consolidated Statements of Income, Comprehensive Income, Stockholders' Equity, and Cash Flows for each of the three years in the period ended December 31, 2015. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the Consolidated Financial Statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2015 and 2014, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles.

As discussed in Notes 1 and 10 to the Consolidated Financial Statements, in January 2016 and effective January 1, 2015, the Company elected early adoption of an element of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013, and our report dated February 16, 2016 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

/s/ RSM US LLP

Phoenix, Arizona

February 16, 2016

83

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	December 31,
	2015			2014
	(in thousands, except per share amounts)
Assets:
Cash and due from banks	$	133,709		$	125,329
Interest-bearing deposits in other financial institutions	90,931			39,067
Cash and cash equivalents	224,640			164,396
Money market investments	122			451
Investment securities - measured at fair value; amortized cost of $1,389 at December 31, 2015 and $1,734 at December 31, 2014	1,481			1,858
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	1,982,523			1,520,237
Investments in restricted stock, at cost	58,111			25,275
Loans - HFS	23,809			—
Loans - HFI, net of deferred loan fees and costs	11,112,854			8,398,265
Less: allowance for credit losses	(119,068		)	(110,216		)
Net loans held for investment	10,993,786			8,288,049
Premises and equipment, net	118,535			113,818
Other assets acquired through foreclosure, net	43,942			57,150
Bank owned life insurance	162,458			141,969
Goodwill	289,638			23,224
Other intangible assets, net	15,716			2,689
Deferred tax assets, net	86,352			62,686
Other assets	273,976			198,696
Total assets	$	14,275,089		$	10,600,498
Liabilities:
Deposits:
Non-interest-bearing demand	$	4,093,976		$	2,288,048
Interest-bearing	7,936,648			6,642,995
Total deposits	12,030,624			8,931,043
Customer repurchase agreements	38,155			54,899
Other borrowings	150,000			390,263
Qualifying debt	210,328			40,437
Other liabilities	254,480			182,928
Total liabilities	12,683,587			9,599,570
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock - par value $0.0001 and liquidation value per share of $1,000; 20,000,000 authorized; zero shares issued and outstanding at December 31, 2015 and 70,500 at December 31, 2014	—			70,500
Common stock - par value $0.0001; 200,000,000 authorized; 103,087,044 shares issued and outstanding at December 31, 2015 and 88,691,249 at December 31, 2014	10			9
Additional paid in capital	1,306,594			828,327
Accumulated other comprehensive income	22,260			16,639
Retained earnings	262,638			85,453
Total stockholders’ equity	1,591,502			1,000,928
Total liabilities and stockholders’ equity	$	14,275,089		$	10,600,498

See accompanying Notes to Consolidated Financial Statements.

84

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED INCOME STATEMENTS

	Year Ended December 31,
	2015			2014			2013
	(in thousands, except per share amounts)
Interest income:
Loans, including fees	$	476,417		$	370,922		$	326,714
Investment securities	37,888			38,603			30,382
Dividends	10,317			6,562			4,454
Other	522			292			1,105
Total interest income	525,144			416,379			362,655
Interest expense:
Deposits	21,795			20,012			16,335
Other borrowings	5,678			9,639			11,506
Qualifying debt	5,007			1,754			1,823
Other	88			81			96
Total interest expense	32,568			31,486			29,760
Net interest income	492,576			384,893			332,895
Provision for credit losses	3,200			4,726			13,220
Net interest income after provision for credit losses	489,376			380,167			319,675
Non-interest income:
Service charges and fees	14,639			10,567			10,123
Income from bank owned life insurance	3,899			4,508			4,809
Card income	3,679			3,310			2,626
Lending related fees	1,948			71			—
Gain (loss) on sales of investment securities, net	615			757			(1,195		)
(Loss) on extinguishment of debt	(81		)	(502		)	(1,387		)
Unrealized gains (losses) on assets and liabilities measured at fair value, net	47			1,212			(6,483		)
Bargain purchase gain from acquisition	—			—			10,044
Other income	5,022			4,728			3,660
Total non-interest income	29,768			24,651			22,197
Non-interest expense:
Salaries and employee benefits	149,828			126,630			113,434
Occupancy	22,180			18,155			19,378
Legal, professional, and directors' fees	18,548			14,278			13,633
Data processing	14,776			10,057			8,589
Insurance	11,003			8,862			8,094
Loan and repossessed asset expenses	4,377			4,423			4,198
Card expense	2,764			2,417			1,805
Marketing	2,885			2,300			2,581
Intangible amortization	1,970			1,461			2,388
Net (gain) on sales / valuations of repossessed and other assets	(2,070		)	(5,350		)	(2,387		)
Acquisition / restructure expense	8,836			198			5,752
Other expense	25,509			23,888			18,751
Total non-interest expense	260,606			207,319			196,216
Income from continuing operations before provision for income taxes	258,538			197,499			145,656
Income tax expense	64,294			48,390			29,830
Income from continuing operations	194,244			149,109			115,826
(Loss) from discontinued operations, net of tax	—			(1,158		)	(861		)
Net income	194,244			147,951			114,965
Dividends on preferred stock	750			1,387			1,410
Net income available to common stockholders	$	193,494		$	146,564		$	113,555

85

	Year Ended December 31,
	2015		2014			2013
	(in thousands, except per share amounts)
Earnings per share from continuing operations:
Basic	$	2.05	$	1.70		$	1.34
Diluted	2.03		1.69			1.32
Loss per share from discontinued operations:
Basic	—		(0.01		)	(0.01		)
Diluted	—		(0.02		)	(0.01		)
Earnings per share available to common stockholders:
Basic	2.05		1.69			1.33
Diluted	2.03		1.67			1.31
Weighted average number of common shares outstanding:
Basic	94,570		86,693			85,682
Diluted	95,219		87,506			86,541
Dividends declared per common share	$	—	$	—		$	—

See accompanying Notes to Consolidated Financial Statements.

86

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Net income	$	194,244		$	147,951		$	114,965
Other comprehensive income (loss), net:
Unrealized gain on transfer of HTM securities to AFS, net of tax effect of $(5,367) for the respective period presented	—			8,976			—
Unrealized (loss) gain on AFS securities, net of tax effect of $3,922, $(17,749), and $18,240, respectively	(6,117		)	29,683			(30,503		)
Unrealized (loss) on cash flow hedge, net of tax effect of $10 for the respective period presented	—			—			(17		)
Unrealized gain on SERP, net of tax effect of$(52) for the respective period presented	90			—			—
Unrealized (loss) on junior subordinated debt, net of tax effect of $2,679 for the respective period presented	(4,276		)	—			—
Realized (gain) loss on sale of AFS securities included in income, net of tax effect of $230, $283, and $(447), respectively	(385		)	(474		)	748
Net other comprehensive (loss) income	(10,688		)	38,185			(29,772		)
Comprehensive income	$	183,556		$	186,136		$	85,193

See accompanying Notes to Consolidated Financial Statements.

87

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Preferred Stock					Common Stock			Additional Paid in Capital		Accumulated Other Comprehensive Income (Loss)			Retained Earnings (Accumulated Deficit)			Total Stockholders’ Equity
	Shares		Amount			Shares	Amount
	(in thousands)
Balance, December 31, 2012	141		$	141,000		86,465	$	9	$	784,852	$	8,226		$	(174,666	)	$	759,421
Net income	—		—			—	—		—		—			114,965			114,965
Exercise of stock options	—		—			440	—		4,595		—			—			4,595
Restricted stock, performance stock unit, and other grants, net	—		—			281	—		7,699		—			—			7,699
Dividends on preferred stock	—		—			—	—		—		—			(1,410		)	(1,410		)
Other comprehensive income, net	—		—			—	—		—		(29,772		)	—			(29,772		)
Balance, December 31, 2013	141		$	141,000		87,186	$	9	$	797,146	$	(21,546	)	$	(61,111	)	$	855,498
Net income	—		—			—	—		—		—			147,951			147,951
Exercise of stock options	—		—			625	—		8,294		—			—			8,294
Restricted stock, performance stock unit, and other grants, net	—		—			332	—		9,141		—			—			9,141
Issuance of common stock under ATM offering, net of offering costs	—		—			548	—		13,746		—			—			13,746
Preferred stock redemption	(70	)	(70,500		)	—	—		—		—			—			(70,500		)
Dividends on preferred stock	—		—			—	—		—		—			(1,387		)	(1,387		)
Other comprehensive income, net	—		—			—	—		—		38,185			—			38,185
Balance, December 31, 2014	71		$	70,500		88,691	$	9	$	828,327	$	16,639		$	85,453		$	1,000,928
Balance, January 1, 2015 (1)	71		$	70,500		88,691	$	9	$	828,327	$	32,948		$	69,144		$	1,000,928
Net income	—		—			—	—		—		—			194,244			194,244
Exercise of stock options	—		—			182	—		1,935		—			—			1,935
Restricted stock, performance stock unit, and other grants, net	—		—			457	—		17,014		—			—			17,014
Issuance of common stock in connection with the acquisition of Bridge (2)	—		—			12,997	1		431,030		—			—			431,031
Issuance of common stock under ATM offering, net of offering costs	—		—			760	—		28,288		—			—			28,288
Preferred stock redemption	(71	)	(70,500		)	—	—		—		—			—			(70,500		)
Dividends on preferred stock	—		—			—	—		—		—			(750		)	(750		)
Other comprehensive loss, net	—		—			—	—		—		(10,688		)	—			(10,688		)
Balance, December 31, 2015	—		$	—		103,087	$	10	$	1,306,594	$	22,260		$	262,638		$	1,591,502

(1) As adjusted, see "Note 10. Qualifying Debt" to the Consolidated Financial Statements describing the $16.3 million reclassification made between retained earnings and AOCI.

(2)    Includes value of certain share-based awards replaced in connection with the acquisition.

See accompanying Notes to Consolidated Financial Statements.

88

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	194,244		$	147,951		$	114,965
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	3,200			4,726			13,220
Depreciation and amortization	8,466			6,166			6,859
Stock-based compensation	17,930			12,465			7,699
Excess tax benefit of stock-based compensation	(5,874		)	(4,194		)	(1,552		)
Deferred income taxes	3,254			(7,182		)	(13,717		)
Amortization of net premiums for investment securities	9,775			8,035			9,727
Accretion of fair market value adjustments on loans acquired from business combinations	(17,144		)	(17,014		)	(10,917		)
Accretion and amortization of fair market value adjustments on other assets and liabilities acquired from business combinations	1,279			(552		)	437
Income from bank owned life insurance	(3,899		)	(4,508		)	(4,809		)
Unrealized losses on assets and liabilities measured at fair value, net	(47		)	(1,212		)	6,483
(Gains) / Losses on:
Sales of investment securities	(615		)	(757		)	1,195
Acquisition of Centennial	—			—			(10,044		)
Extinguishment of debt	81			502			1,387
Other assets acquired through foreclosure, net	(2,628		)	(2,866		)	(5,924		)
Valuation adjustments of other repossessed assets, net	182			294			3,743
Sale of premises, equipment, and other assets, net	376			(2,778		)	(206		)
Changes in, net of acquisitions:
Other assets	(9,999		)	9,242			33,185
Other liabilities	14,231			14,971			13,318
Net cash provided by operating activities	212,812			163,289			165,049
Cash flows from investing activities:
Investment securities - measured at fair value
Principal pay downs and maturities	347			1,144			1,881
Investment securities - AFS
Purchases	(827,002		)	(143,052		)	(729,768		)
Principal pay downs and maturities	273,950			226,455			208,228
Proceeds from sales	132,546			95,826			63,153
Investment securities - HTM
Principal pay downs and maturities	—			6,600			5,375
Purchase of investment tax credits	(29,437		)	(32,484		)	(40,355		)
Sale (purchase) of money market investments, net	330			2,181			(1,968		)
Proceeds from bank owned life insurance	797			1,046			2,582
(Purchase) liquidation of restricted stock	(25,821		)	4,911			750
Loan fundings and principal collections, net	(1,269,351		)	(1,560,633		)	(728,793		)
Purchase of premises, equipment, and other assets, net	(10,856		)	(13,925		)	(18,873		)
Proceeds from sale of other real estate owned and repossessed assets, net	45,627			25,918			43,242
Cash and cash equivalents acquired in acquisitions, net	342,427			—			21,204
Net cash used in investing activities	(1,366,443		)	(1,386,013		)	(1,173,342		)

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	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Cash flows from financing activities:
Net increase in deposits	$	1,357,855		$	1,093,353		$	1,045,173
Proceeds from issuance of subordinated debt	148,211			—			—
Net (increase) decrease in borrowings	(257,038		)	40,407			70,159
Early extinguishment of debt	—			(6,501		)	(10,887		)
Proceeds from exercise of common stock options	1,935			8,294			4,595
Redemption of preferred stock	(70,500		)	(70,500		)	—
Excess tax benefit of stock-based compensation	5,874			4,194			1,552
Cash dividends paid on preferred stock	(750		)	(1,387		)	(1,410		)
Proceeds from issuance of stock in offerings, net	28,288			13,746			—
Net cash provided by financing activities	1,213,875			1,081,606			1,109,182
Net increase (decrease) in cash and cash equivalents	60,244			(141,118		)	100,889
Cash and cash equivalents at beginning of period	164,396			305,514			204,625
Cash and cash equivalents at end of period	$	224,640		$	164,396		$	305,514
Supplemental disclosure:
Cash paid during the period for:
Interest	$	28,831		$	26,516		$	28,613
Income taxes	54,590			35,556			19,105
Non-cash investing and financing activity:
Transfers to other assets acquired through foreclosure, net	28,566			13,777			24,911
Change in unfunded LIHTC and SBIC commitments	39,617			9,798			50,000
Non-cash assets acquired in acquisition	1,587,186			—			410,827
Non-cash liabilities acquired in acquisition	1,764,996			—			421,987
Change in unrealized gain on AFS securities, net of tax	(6,502		)	29,209			—
Change in unrealized gain on TRUP securities, net of tax	(4,276		)	—			—
Change in unfunded obligations	(27,325		)	(28,522		)	(29,755		)
Transfer of HTM securities to AFS, amortized cost	—			275,292			—
Unrealized gain on transfer of HTM securities to AFS, net of tax	—			8,976			—

See accompanying Notes to Consolidated Financial Statements.

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WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division, with their results reported under the Company's Northern California operating segment.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Consolidated Financial Statements.

Principles of consolidation

On December 31, 2013, the Company consolidated its three bank subsidiaries under one bank charter, WAB. As the subsidiary bank mergers did not meet the definition of a business combination under the guidance of ASC 805, Business Combinations, the entities were combined in a method similar to a pooling of interests.

As of December 31, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal and non-profit loans, and leases; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after distributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Financial Statements as of and for the years ended December 31, 2015, 2014, and 2013 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

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Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Cash and cash equivalents

For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks (including cash items in process of clearing), and federal funds sold. Cash flows from loans originated by the Company and customer deposit accounts are reported net.

The Company maintains amounts due from banks, which at times may exceed federally insured limits. The Company has not experienced any losses in such accounts.

Cash reserve requirements

Depository institutions are required by law to maintain reserves against their transaction deposits. The reserves must be held in cash or with the FRB. Banks are permitted to meet this requirement by maintaining the specified amount as an average balance over a two-week period. The total of reserve balances was approximately $37.9 million and $11.6 million as of December 31, 2015 and 2014, respectively.

Investment securities

Investment securities may be classified as HTM, AFS, or measured at fair value. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading securities measured at fair value are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

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For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Bank also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans, held for sale

Loans, held for sale consist primarily of SBA and CRE loans that the Company originates (or acquires) and intends to sell. These loans are carried at the lower of aggregate cost or fair value. Fair value is determined based on available market data for similar assets, expected cash flows, and appraisals of underlying collateral or the credit quality of the borrower. Gains and losses on the sale of loans are recognized pursuant to ASC 860, Transfers and Servicing. Interest income of these loans is accrued daily and loan origination fees and costs are deferred and included in the cost basis of the loan. The Company issues various representations and warranties associated with these loan sales. The Company has not experienced any losses as a result of these representations and warranties.

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Consolidated Financial Statements.

Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the

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full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations, or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

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An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

Transfers of financial assets

Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed surrendered when the 1) assets have been isolated from the Company; 2) transferee obtains the right to pledge or exchange the transferred assets; and 3) Company no longer maintains effective control over the transferred assets through an agreement to repurchase the transferred assets before maturity.

Premises and equipment

Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the terms of the lease or the estimated lives of the improvements, whichever is shorter. Depreciation and amortization is computed using the following estimated lives: 

	Years
Bank premises	31
Furniture, fixtures, and equipment	3 - 10
Leasehold improvements (1)	3 - 10

(1) Depreciation is recorded over the lesser of 3 to 10 years or the term of the lease.

Management periodically reviews premises and equipment in order to determine if facts and circumstances suggest that the value of an asset is not recoverable.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price over the fair value of the identifiable net assets acquired in accordance with applicable guidance. The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. Pursuant to this guidance, if the qualitative assessment indicates potential impairment, the Company will proceed with the two-step process. The first step tests for impairment, while the second step, if necessary, measures the impairment. The resulting impairment amount, if any, is charged to current period earnings as non-interest expense.

The Company’s intangible assets consist primarily of core deposit intangible assets that are amortized over periods ranging from 5 to 10 years. The Company considers the remaining useful lives of its core deposit intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its core deposit intangibles during the years ended December 31, 2015, 2014, or 2013.

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

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Investments in low income housing credits

The Company invests in Limited Partnerships formed for the purpose of investing in low income housing projects, which qualify for federal LIHTC. These investments are expected to generate tax credits over a ten-year period. The Company adopted the amended guidance in ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, beginning on January 1, 2014 and accounts for these investments using the proportional amortization method. See "Note 15. Income Taxes" for the additional disclosures required under these amendments.

Bank owned life insurance

BOLI is carried at its cash surrender value with changes recorded in other non-interest income in the Consolidated Income Statements. The face amount of the underlying policies including death benefits was $361.7 million and $321.9 million as of December 31, 2015 and 2014, respectively. There are no loans offset against cash surrender values, and there are no restrictions as to the use of proceeds.

Customer repurchase agreements

The Company enters into repurchase agreements with customers, whereby it pledges securities against overnight investments made from the customer’s excess collected funds. The Company records these at the amount of cash received in connection with the transaction.

Stock compensation plans

The Company has the Incentive Plan, as amended, which is described more fully in "Note 11. Stockholders' Equity" of these Notes to Consolidated Financial Statements. Compensation expense for stock options and non-vested restricted stock awards is based on the fair value of the award on the measurement date which, for the Company, is the date of the grant and is recognized ratably over the service period of the award. The Company utilizes the Black-Scholes option-pricing model to calculate the fair value of stock options. The fair value of non-vested restricted stock awards is the market price of the Company’s stock on the date of grant.

See "Note 11. Stockholders' Equity" of these Notes to Consolidated Financial Statements for further discussion of stock options and restricted stock awards.

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective

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prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit related to uncertain tax positions may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits from uncertain tax positions are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 15. Income Taxes" for further discussion on income taxes.

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

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As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at December 31, 2015 and 2014. The estimated fair value amounts for December 31, 2015 and 2014 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 17. Fair Value Accounting" in these Notes to Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

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Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

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FHLB advances and other borrowed funds

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In November 2015, the FASB issued guidance within ASU 2015-17, Income Taxes. The amendments in ASU 2015-17 to Topic 740, Income Taxes, changes the presentation of deferred income tax liabilities and assets, from previously bifurcated current and noncurrent, to a single noncurrent amount on the classified statement of financial position. The amendment is effective from the annual period ending after December 15, 2016, and for and interim periods within those annual periods. Early

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application is permitted. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In January 2016, the FASB issued guidance within ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, contain the following elements: 1) require equity investments to be measured at fair value with changes in fair value recognized in net income; 2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in OCI the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; 7) clarifies that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to AFS securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item 5) above, early adoption of the amendments in this Update is not permitted. See discussion in Recently adopted accounting guidance below for further discussion of the Company's election to early adopt this element of ASU 2016-01.

Recently adopted accounting guidance

In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate CollateralizedConsumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In June 2014, the FASB issued guidance within ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings,and Disclosures. The amendments in ASU 2014-11 to Topic 860, Transfers and Servicing, change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The accounting changes are effective for the first interim or annual period beginning after December 15, 2014. The amendments also require disclosure of information about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. An entity will also be required to disclose information about repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014 and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.8 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs were not significant.

In the third quarter 2015, the Company elected early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. Under current GAAP, the acquirer is required to retrospectively adjust the

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provisional amounts recognized at the acquisition date with a corresponding adjustment to goodwill and is also required to revise comparative information for prior periods presented in the financial statements. The amendments in ASU 2015-16 to Topic 805, Business Combinations, require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this Update also require that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. An entity is required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. As a result of the adoption of this amended guidance, all measurement period adjustments identified during the quarter have been recognized in the current reporting period. As the closing date of the Bridge acquisition was June 30, 2015, Bridge's results of operations were not included in the Company's results until July 1, 2015. Accordingly, there are no amounts recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the measurement period adjustments identified and recognized during the current reporting period.

In January 2016, and effective January 1, 2015, the Company elected early adoption of an element of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which relates to the accounting for changes in the fair value of its own liabilities when the fair value option for financial instruments has been elected. As mentioned above, under this portion of this amended standard, the portion of the total change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value is presented separately in other comprehensive income rather than being recognized in the income statement at each reporting period. As the Company's junior subordinated debt are variable rate instruments, that fair value movement relates to credit risk and therefore the fair value adjustment qualifies for presentation in other comprehensive income. See "Note 10. Qualifying Debt" for additional detail on the impact that adoption has had on the current reporting period.

2. MERGERS, ACQUISITIONS AND DISPOSITIONS

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of WAL's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations have been included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $8.8 million for the year ended December 31, 2015, have been included in non-interest expense, of which approximately $0.9 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability.

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The following table shows the recognized amounts of identifiable assets acquired and liabilities assumed at their as adjusted acquisition date fair values, which include all measurement period adjustments identified and recognized since July 1, 2015:

	As Adjusted
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,299
Investments in restricted stock	7,015
Loans	1,439,930
Premises and equipment	1,519
Other assets acquired through foreclosure	1,407
Bank owned life insurance	17,385
Investment in LIHTC	5,354
Intangible assets	14,997
Deferred tax assets, net	18,287
Other assets	19,993
Total assets	$	1,966,152
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	11,678
Total liabilities	1,764,996
Net assets acquired	$	201,156
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	266,413

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

The Company identified $6.8 million in measurement period adjustments since July 1, 2015, which have been reflected as an adjustment to increase goodwill. Due to early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments, as discussed in "Note 1. Summary of Significant Accounting Policies," these adjustments to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined, rather than retrospectively adjusting the provisional amounts at the acquisition date. Any effects on earnings from changes in the provisional amounts have been appropriately reflected in the Consolidated Income Statement for the year ended December 31, 2015. The significant measurement period adjustments relate to loans, net deferred tax assets, and other liabilities. The fair value of loans decreased as there were further adjustments made to the interest and credit marks on Bridge loans. The net deferred tax assets balance was adjusted to account for the tax effects of all the changes in the fair values of assets acquired and liabilities assumed. Other liabilities also increased to accrue for unrecorded expenses and other liabilities incurred prior to acquisition. Although further measurement period adjustments are not expected to be significant, the estimated fair value of tax related items and other liabilities are still preliminary and are subject to additional measurement period adjustments.

Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $26.0 million. The fair value of PCI loans totals $10.9 million, which is net of interest and credit marks of $5.7 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Consolidated Financial Statements for additional detail of the acquired loans.

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In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill related to the acquisition totaled $266.4 million, which includes $6.8 million of measurement period adjustments identified and recognized since July 1, 2015. Goodwill has been allocated to the Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015. Management believes this methodology allocates goodwill to the reporting units in a manner consistent with the expected synergies of the combination. None of the goodwill recognized as part of the acquisition is expected to be deductible for income tax purposes.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be amortized over the remaining life of the trusts. See "Note 10. Qualifying Debt" of these Notes to Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge officer's based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the officer's service is terminated by Bridge or by the officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the officer's attainment of age 55 or, if the officer is already age 55 as of such termination of employment, on the first business day of January of the year following the officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and an employee compensation rate increase of 4.00% were used in determining the SERP liability as of June 30, 2015. See "Note 19. Employee Benefit Plans" of these Notes to the Consolidated Financial Statements for further detail and discussion of the SERP.

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Year Ended December 31,
	2015		2014
	(in thousands, except per share amounts)
Interest income	$	560,292	$	495,235
Non-interest income	37,073		38,768
Net income available to common stockholders (1)	205,099		164,165
Earnings per share - basic	1.90		1.64
Earnings per share - diluted	1.87		1.62

(1) Excludes acquisition / restructure related costs incurred by the Company of $8.8 million for the year ended December 31, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $6.8 million for the year ended December 31, 2015, respectively, and related tax effects.

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PartnersFirst Discontinued Operations

The Company discontinued its affinity credit card business and presented these activities as discontinued operations. During the second quarter 2014, the Company shut down its remaining affinity credit card operations. Therefore, no additional discontinued operations have been reported.

The following table summarizes the operating results of the discontinued operations for the year ended December 31, 2014 and 2013: 

	Year Ended December 31,
	2014			2013
	(in thousands)
Operating revenue	$	(358	)	$	3,345
Non-interest expenses	(1,369		)	(4,855		)
Loss before income taxes	(1,727		)	(1,510		)
Income tax benefit	(569		)	(649		)
Net loss	$	(1,158	)	$	(861	)

3. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities at December 31, 2015 and 2014 are summarized as follows: 

	December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,059	$	(49	)	$	10,060
Commercial MBS issued by GSEs	19,147		72		(105		)	19,114
Corporate debt securities	12,769		482		—			13,251
CRA investments	34,722		—		(37		)	34,685
Municipal obligations	320,087		14,743		—			334,830
Preferred stock	108,417		4,286		(1,467		)	111,236
Private label commercial MBS	4,685		6		—			4,691
Private label residential MBS	261,530		5		(4,407		)	257,128
Residential MBS issued by GSEs	1,169,631		5,254		(4,664		)	1,170,221
Trust preferred securities	32,000		—		(7,686		)	24,314
U.S. treasury securities	2,996		—		(3		)	2,993
Total AFS securities	$	1,966,034	$	34,907	$	(18,418	)	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs								$	1,481

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	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

For additional information on the fair value changes of securities measured at fair value, see the trading securities table in "Note 17. Fair Value Accounting" of these Notes to Consolidated Financial Statements.

The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI for both debt and equity securities is a decline in the market value below the amount recorded for an investment, and taking into account the severity and duration of the decline. Another potential indication of OTTI is a downgrade below investment grade. In determining whether an impairment is OTTI, the Company considers the length of time and the extent to which the market value has been below cost, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions of its industry, and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery. For marketable equity securities, the Company also considers the issuer’s financial condition, capital strength, and near-term prospects.

For debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates, credit spreads, and industry and issuer-specific factors), the issuer’s financial condition, near-term prospects, and current ability to make future payments in a timely manner, as well as the issuer’s ability to service debt, and any change in agencies’ ratings at the evaluation date from the acquisition date and any likely imminent action.

The Company has reviewed securities for which there is an unrealized loss in accordance with its accounting policy for OTTI described above and determined that there were no impairment charges for the years ended December 31, 2015, 2014, and 2013. The Company does not consider any securities to be other-than-temporarily impaired as of December 31, 2015 and 2014. No assurance can be made that OTTI will not occur in future periods.

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Information pertaining to securities with gross unrealized losses at December 31, 2015 and 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	December 31, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	49	$	1	$	—	$	—	$	49	$	1
Commercial MBS issued by GSEs	105		17,051		—		—		105		17,051
CRA investments	37		24,729		—		—		37		24,729
Preferred stock	377		10,542		1,090		14,761		1,467		25,303
Private label residential MBS	3,733		226,720		674		30,372		4,407		257,092
Residential MBS issued by GSEs	3,566		536,515		1,098		38,338		4,664		574,853
Trust preferred securities	—		—		7,686		24,314		7,686		24,314
U.S. treasury securities	3		2,006		—		—		3		2,006
Total AFS securities	$	7,870	$	817,564	$	10,548	$	107,785	$	18,418	$	925,349

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

At December 31, 2015 and 2014, the Company’s unrealized losses relate primarily to interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The total number of securities in an unrealized loss position at December 31, 2015 was 146, compared to 109 at December 31, 2014. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and industry analysis reports. Since material downgrades have not occurred and management does not intend to sell the debt securities in an unrealized loss position in the foreseeable future, none of the securities described in the above table or in this paragraph were deemed to be OTTI.

The preferred stock and trust preferred securities have yields based on floating rate LIBOR, which are highly correlated to the federal funds rate and have been negatively affected by the low rate environment. This has resulted in unrealized losses for these securities.

107

The amortized cost and fair value of securities as of December 31, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	December 31, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	62,852	$	63,114
After one year through five years	77,273		81,090
After five years through ten years	68,935		72,283
After ten years	301,981		314,882
Mortgage-backed securities	1,454,993		1,451,154
Total AFS securities	$	1,966,034	$	1,982,523

The following tables summarize the carrying amount of the Company’s investment ratings position as of December 31, 2015 and 2014: 

	December 31, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,060	$	—	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		—		—		—		—		19,114
Corporate debt securities	—		—		2,721		5,489		5,041		—		—		13,251
CRA investments	—		—		—		—		—		—		34,685		34,685
Municipal obligations	7,949		—		180,460		131,110		6,243		180		8,888		334,830
Preferred stock	—		—		—		—		79,955		23,655		7,626		111,236
Private label commercial MBS	4,691		—		—		—		—		—		—		4,691
Private label residential MBS	235,605		—		40		3,186		1,750		2,705		13,842		257,128
Residential MBS issued by GSEs	—		1,170,221		—		—		—		—		—		1,170,221
Trust preferred securities	—		—		—		—		24,314		—		—		24,314
U.S. treasury securities	—		2,993		—		—		—		—		—		2,993
Total AFS securities (1)	$	248,245	$	1,192,328	$	183,221	$	139,785	$	117,303	$	36,600	$	65,041	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	—	$	—	$	—	$	—	$	1,481

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

108

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Securities with carrying amounts of approximately $830.7 million and $755.5 million at December 31, 2015 and 2014, respectively, were pledged for various purposes as required or permitted by law.

The following table presents gross gains and losses on sales of investment securities: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Gross gains	$	1,144		$	1,118		$	1,569
Gross losses	(529		)	(361		)	(2,764		)
Net gains on sales of investment securities	$	615		$	757		$	(1,195	)

109

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company’s loan portfolio is as follows: 

	December 31,
	2015			2014
	(in thousands)
Loans, HFI
Commercial and industrial	$	5,114,257		$	3,326,708
Commercial real estate - non-owner occupied	2,283,536			2,052,566
Commercial real estate - owner occupied	2,083,285			1,732,888
Construction and land development	1,133,439			748,053
Residential real estate	322,939			299,402
Commercial leases	148,493			205,639
Consumer	26,905			33,009
Loans, net of deferred loan fees and costs	11,112,854			8,398,265
Allowance for credit losses	(119,068		)	(110,216		)
Total loans HFI	$	10,993,786		$	8,288,049

Net deferred loan fees and costs as of December 31, 2015 and 2014 total $19.2 million and $12.5 million, respectively. Net unamortized discounts on loans total $8.2 million and $7.5 million as of December 31, 2015 and 2014, respectively. Total loans held for investment are also net of interest rate and credit marks on acquired loans totaling $40.5 million and $27.1 million as of December 31, 2015 and 2014, respectively.

As of December 31, 2015, the Company also has $23.8 million of HFS loans.

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	December 31, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,078,968	$	445	$	362	$	3,510	$	4,317	$	2,083,285
Non-owner occupied	2,099,274		2,481		—		2,822		5,303		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	5,066,197		26,358		14,124		7,578		48,060		5,114,257
Leases	145,905		—		—		2,588		2,588		148,493
Construction and land development
Construction	694,527		—		—		—		—		694,527
Land	438,495		—		—		417		417		438,912
Residential real estate	317,677		888		159		4,215		5,262		322,939
Consumer	26,587		12		91		215		318		26,905
Total loans	$	11,046,589	$	30,184	$	14,736	$	21,345	$	66,265	$	11,112,854

110

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	December 31, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	749	$	3,253	$	4,002	$	339	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	11,851		2,822		14,673		—		30,226		8,601		38,827		2,171
Multi-family	—		—		—		—		—		—		—		—
Commercial and industrial
Commercial	3,263		15,026		18,289		2,671		2,621		496		3,117		703
Leases	—		2,588		2,588		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	1,892		417		2,309		—		2,686		2,640		5,326		805
Residential real estate	1,835		4,489		6,324		—		1,332		4,841		6,173		232
Consumer	—		196		196		18		25		188		213		83
Total	$	19,590	$	28,791	$	48,381	$	3,028	$	50,893	$	16,766	$	67,659	$	5,132

The reduction in interest income associated with loans on non-accrual status was approximately $2.5 million, $3.8 million, and $5.4 million for the years ended December 31, 2015, 2014, and 2013, respectively.

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as Special Mention, Substandard, Doubtful, and Loss. Substandard loans include those characterized by well-defined weaknesses and carry the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful, or risk rated eight, have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The final rating of Loss covers loans considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that warrant management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly.

111

The following tables present gross loans by risk rating: 

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,032,932	$	28,422	$	20,814	$	1,117	$	—	$	2,083,285
Non-owner occupied	2,054,428		14,867		35,282		—		—		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	4,962,930		76,283		74,294		750		—		5,114,257
Leases	140,531		4,580		794		2,588		—		148,493
Construction and land development
Construction	678,438		16,089		—		—		—		694,527
Land	420,819		362		17,731		—		—		438,912
Residential real estate	310,067		776		12,096		—		—		322,939
Consumer	26,438		209		258		—		—		26,905
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,799,558	$	140,932	$	104,232	$	1,867	$	—	$	11,046,589
Past due 30 - 59 days	1,907		271		28,006		—		—		30,184
Past due 60 - 89 days	4,077		385		10,274		—		—		14,736
Past due 90 days or more	—		—		18,757		2,588		—		21,345
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

112

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

The table below reflects the recorded investment in loans classified as impaired: 

	December 31,
	2015			2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	24,287		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	104,587			41,822
Total impaired loans	$	128,874		$	166,750
Valuation allowance related to impaired loans (3)	$	(4,658	)	$	(10,765	)

(1) Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

(2) Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

The following table presents impaired loans by class: 

	December 31,
	2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	23,153	$	44,893
Non-owner occupied	41,081		66,324
Multi-family	—		—
Commercial and industrial
Commercial	26,513		13,749
Leases	2,896		373
Construction and land development
Construction	—		—
Land	18,322		21,748
Residential real estate	16,575		19,300
Consumer	334		363
Total	$	128,874	$	166,750

A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to realizable value instead of establishing a valuation allowance and are included, when applicable, in the table above as “Impaired loans without a specific valuation allowance under ASC 310.” However, before concluding that an impaired loan needs no associated valuation allowance, an assessment is made to consider all available and relevant information for the method used to evaluate impairment and the type of loan being assessed. The valuation allowance disclosed above is included in the allowance for credit losses reported in the Consolidated Balance Sheets as of December 31, 2015 and 2014.

113

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Average balance on impaired loans	$	150,151	$	169,758	$	182,670
Interest income recognized on impaired loans	4,794		5,494		6,235
Interest recognized on non-accrual loans, cash basis	1,634		2,536		1,916

The following table presents average investment in impaired loans by loan class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	34,912	$	37,048	$	49,452
Non-owner occupied	56,360		68,821		56,110
Multi-family	—		—		89
Commercial and industrial
Commercial	17,534		16,168		15,023
Leases	2,948		410		727
Construction and land development
Construction	—		—		—
Land	19,561		21,580		27,326
Residential real estate	18,453		25,223		33,339
Consumer	383		508		604
Total	$	150,151	$	169,758	$	182,670

The average investment in TDR loans included in the average investment in impaired loans table above for the years ended December 31, 2015, 2014, and 2013 was $113.9 million, $126.6 million, and $141.8 million, respectively.

The following table presents interest income on impaired loans by class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	1,575	$	1,550	$	1,726
Non-owner occupied	1,560		1,484		2,043
Multi-family	—		1		—
Commercial and industrial
Commercial	288		745		1,087
Leases	—		—		—
Construction and land development
Construction	—		—		—
Land	785		1,021		1,288
Residential real estate	579		646		62
Consumer	7		47		29
Total	$	4,794	$	5,494	$	6,235

The Company is not committed to lend significant additional funds on these impaired loans.

114

The following table summarizes nonperforming assets: 

	December 31,
	2015		2014
	(in thousands)
Non-accrual loans (1)	$	48,381	$	67,659
Loans past due 90 days or more on accrual status	3,028		5,132
Troubled debt restructured loans (2)	70,707		84,720
Total nonperforming loans	122,116		157,511
Other assets acquired through foreclosure, net	43,942		57,150
Total nonperforming assets	$	166,058	$	214,661

(1) Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

(2) Includes accruing TDR loans only.

Loans Acquired in Bridge Acquisition

The following table presents information regarding the contractually required principal and interest payments receivable, cash flows expected to be collected, and the estimated fair value of loans acquired in the Bridge acquisition, as of June 30, 2015, the closing date of the transaction. The estimated fair value was decreased by $7.2 million for measurement period adjustments recognized during the six months ended December 31, 2015:

	As Adjusted
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal and interest payments:
PCI	$	17,899	$	3,127	$	—	$	2,509	$	—	$	23,535
Non-PCI	1,225,837		340,762		106,851		26,999		987		1,701,436
Total loans acquired	1,243,736		343,889		106,851		29,508		987		1,724,971
Cash flows expected to be collected:
PCI	10,066		1,570		—		2,088		—		13,724
Non-PCI	1,186,076		304,944		102,240		26,629		989		1,620,878
Total loans acquired	1,196,142		306,514		102,240		28,717		989		1,634,602
Fair value of loans acquired:
PCI	7,362		1,417		—		2,075		—		10,854
Non-PCI	1,076,742		229,306		99,080		23,023		925		1,429,076
Total loans acquired	$	1,084,104	$	230,723	$	99,080	$	25,098	$	925	$	1,439,930

115

Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Balance, at beginning of period	$	19,156		$	28,164		$	7,072
Additions due to acquisition of Bridge	857			—			—
Measurement period adjustments	38			—			22,318
Reclassifications from non-accretable to accretable yield (1)	1,747			6,052			9,817
Accretion to interest income	(3,996		)	(7,185		)	(7,182		)
Reversal of fair value adjustments upon disposition of loans	(1,877		)	(7,875		)	(3,861		)
Balance, at end of period	$	15,925		$	19,156		$	28,164

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowance for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Year Ended December 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			820			5,550			127			6,497
Recoveries	(1,872		)	(4,139		)	(2,181		)	(3,754		)	(203		)	(12,149		)
Provision	(1,454		)	(9,762		)	(3,539		)	18,411			(456		)	3,200
Ending balance	$	18,976		$	23,160		$	5,278		$	71,181		$	473		$	119,068
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	87			964			1,728			4,370			513			7,662
Recoveries	(2,160		)	(3,859		)	(1,896		)	(4,728		)	(459		)	(13,102		)
Provision	1,966			(6,176		)	(4,352		)	14,551			(1,263		)	4,726
Ending balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
2013
Beginning Balance	$	10,554		$	34,982		$	15,237		$	32,860		$	1,794		$	95,427
Charge-offs	1,538			8,648			5,922			4,000			1,371			21,479
Recoveries	(2,060		)	(2,758		)	(2,097		)	(5,037		)	(930		)	(12,882		)
Provision	3,443			2,972			228			5,760			817			13,220
Ending balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050

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The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	18,230	$	914	$	—	$	—	$	21	$	24,287
Impaired loans with no allowance recorded	20,375		38,737		8,283		15,661		18,322		2,896		313		104,587
Total loans individually evaluated for impairment	23,153		41,081		26,513		16,575		18,322		2,896		334		128,874
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	15,198		62,205		2,445		2,992		—		—		—		82,840
Total recorded investment	$	2,083,285	$	2,283,536	$	5,114,257	$	322,939	$	1,133,439	$	148,493	$	26,905	$	11,112,854
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	19,233	$	969	$	—	$	—	$	21	$	25,345
Impaired loans with no allowance recorded	63,709		61,692		71,773		44,142		82,800		5,229		3,923		333,268
Total loans individually evaluated for impairment	66,487		64,036		91,006		45,111		82,800		5,229		3,944		358,613
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	20,227		88,181		7,820		3,536		—		—		—		119,764
Total unpaid principal balance	$	2,131,648	$	2,332,467	$	5,184,125	$	352,019	$	1,197,917	$	150,826	$	30,515	$	11,379,517
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	858	$	11	$	3,518	$	270	$	—	$	—	$	1	$	4,658
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	858		11		3,518		270		—		—		1		4,658
Loans collectively evaluated for impairment	10,953		11,302		65,806		5,008		18,976		1,857		472		114,374
Loans acquired with deteriorated credit quality	—		36		—		—		—		—		—		36
Total allowance for credit losses	$	11,811	$	11,349	$	69,324	$	5,278	$	18,976	$	1,857	$	473	$	119,068

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	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructurings

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. A TDR loan is also considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

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The following table presents information on the financial effects of TDR loans by class for the periods presented:

	Year Ended December 31, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	193		—		—		193		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	1	81		—		3		78		4
Consumer	—	—		—		—		—		—
Total	3	$	530	$	—	$	3	$	527	$	4

	Year Ended December 31, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	6	$	14,646	$	378	$	257	$	14,011	$	33
Non-owner occupied	5	16,976		—		60		16,916		15
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	6	2,655		—		—		2,655		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	2,687		—		47		2,640		—
Residential real estate	5	1,966		447		70		1,449		15
Consumer	—	—		—		—		—		—
Total	24	$	38,930	$	825	$	434	$	37,671	$	67

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	Year Ended December 31, 2013
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	8	$	3,681	$	—	$	54	$	3,627	$	28
Non-owner occupied	5	10,735		1,030		63		9,642		14
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	13	4,809		—		19		4,790		11
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	286		—		—		286		1
Residential real estate	13	5,434		267		887		4,280		24
Consumer	2	74		—		5		69		3
Total	43	$	25,019	$	1,297	$	1,028	$	22,694	$	81

The following table presents TDR loans by class for which there was a payment default during the period: 

	Year Ended December 31,
	2015			2014			2013
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395	3	$	2,506
Non-owner occupied	—	—		2	984		3	1,490
Multi-family	—	—		—	—		—	—
Commercial and industrial
Commercial	—	—		3	369		3	1,089
Leases	—	—		—	—		—	—
Construction and land development
Construction	1	137		—	—		—	—
Land	—	—		—	—		2	330
Residential real estate	3	1,047		1	202		4	955
Consumer	—	—		—	—		—	—
Total	4	$	1,184	8	$	1,950	15	$	6,370

A TDR loan is deemed to have a payment default when it becomes past due 90 days, goes on non-accrual, or is restructured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses.

At December 31, 2015 and 2014, there was $0.1 million and $1.2 million, respectively, in loan commitments outstanding on TDR loans.

Loan Purchases and Sales

For the years ended December 31, 2015 and 2014, secondary market loan purchases totaled $137.2 million and $166.4 million, respectively. For 2015, these purchased loans consisted of $117.1 million of commercial and industrial loans, $13.2 million of commercial real estate loans, $6.8 million in commercial leases, and $0.1 million of construction and land development loans. For 2014, these purchased loans consisted primarily of commercial and industrial loans. In addition, the Company periodically acquires newly originated loans at closing through participations or loan syndications.

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During the year ended December 31, 2015, the Company sold loans, which consisted primarily of commercial and industrial and commercial mortgage-backed securities loans, with a carrying value of $102.2 million and recognized a gain of $0.5 million on the sales. The Company had no significant loan sales in 2014.

5. PREMISES AND EQUIPMENT

 The following is a summary of the major categories of premises and equipment:

	December 31,
	2015			2014
	(in thousands)
Bank premises	$	83,431		$	82,494
Land and improvements	33,971			33,971
Furniture, fixtures, and equipment	40,025			51,320
Leasehold improvements	18,958			18,160
Construction in progress	1,999			848
Total	178,384			186,793
Accumulated depreciation and amortization	(59,849		)	(72,975		)
Premises and equipment, net	$	118,535		$	113,818

Lease Obligations

The Company leases certain premises and equipment under non-cancelable operating leases expiring through 2025. The following is a schedule of future minimum rental payments under these leases at December 31, 2015: 

	(in thousands)
2016	$	8,547
2017	7,999
2018	7,536
2019	6,628
2020	4,986
Thereafter	8,879
Total future minimum rental payments	$	44,575

The Company leases the majority of its office locations and many of these leases contain multiple renewal options and provisions for increased rents. Total rent expense of $8.1 million, $6.2 million, and $6.9 million is included in occupancy expense for the years ended December 31, 2015, 2014, and 2013, respectively. Total depreciation expense of $7.7 million, $6.0 million, and $6.0 million is included in occupancy expense for the years ended December 31, 2015, 2014, and 2013, respectively.

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6. OTHER ASSETS ACQUIRED THROUGH FORECLOSURE

The following table represents the changes in other assets acquired through foreclosure: 

	Year Ended December 31,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,407			—			1,407
Transfers to other assets acquired through foreclosure, net	28,566			—			28,566
Proceeds from sale of other real estate owned and repossessed assets, net	(51,038		)	5,411			(45,627		)
Valuation adjustments, net	—			(182		)	(182		)
Gains, net (1)	2,628			—			2,628
Balance, end of period	$	52,984		$	(9,042	)	$	43,942
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	13,777			—			13,777
Proceeds from sale of other real estate owned and repossessed assets, net	(33,643		)	7,725			(25,918		)
Valuation adjustments, net	—			(294		)	(294		)
Gains, net (1)	2,866			—			2,866
Balance, end of period	$	71,421		$	(14,271	)	$	57,150
	2013
Balance, beginning of period	$	113,474		$	(36,227	)	$	77,247
Additions from acquisition of Centennial	5,622			—			5,622
Transfers to other assets acquired through foreclosure, net	24,911			—			24,911
Proceeds from sale of other real estate owned and repossessed assets, net	(61,510		)	18,268			(43,242		)
Valuation adjustments, net	—			(3,743		)	(3,743		)
Gains, net (1)	5,924			—			5,924
Balance, end of period	$	88,421		$	(21,702	)	$	66,719

(1) Includes net gains related to initial transfers to other assets of $0.9 million, $0.1 million, and $0.9 million during the years ended December 31, 2015, 2014, and 2013 respectively, pursuant to accounting guidance.

At December 31, 2015, 2014, and 2013, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 39 properties at December 31, 2015, compared to 67 at December 31, 2014.

7. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill represents the excess consideration paid for net assets acquired in a business combination over their fair value. Goodwill and other intangible assets acquired in a business combination and determined to have an indefinite useful life are not subject to amortization, but are subsequently evaluated for impairment at least annually. The Company's goodwill totals $289.6 million as of December 31, 2015, of which, $23.2 million relates to the Nevada operating segment, $149.6 million relates to the Northern California segment, and $116.8 million relates to the Central Business Lines segment.

During the years ended December 31, 2015, 2014, and 2013, there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary and, based on the Company's annual goodwill and intangibles impairment tests as of October 1 of each of these years, it was determined that goodwill and intangible assets were not impaired.

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The following is a summary of the Company's acquired intangible assets:

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in thousands)
Subject to amortization:
Core deposit intangibles	$	40,804	$	25,438	$	15,366	$	26,157	$	23,468	$	2,689
	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Impairment		Net Carrying Amount		Gross Carrying Amount		Impairment		Net Carrying Amount
Not subject to amortization
Trade name	$	350	$	—	$	350	$	—	$	—	$	—

As of December 31, 2015, the Company's core deposit intangible assets had a weighted average estimated useful life of 8.7 years. The Company's legacy core deposit intangibles assets are amortized on a straight-line basis. The core deposit intangible assets acquired in the acquisition of Bridge are being amortized using an accelerated amortization method over a period of 10 years. Amortization expense recognized on all amortizable intangibles totaled $2.0 million, $1.5 million, and $2.4 million for the years ended December 31, 2015, 2014, and 2013, respectively.

Below is a summary of future estimated aggregate amortization expense:

	Year Ended December 31,
	(in thousands)
2016	$	2,788
2017	2,074
2018	1,594
2019	1,547
2020	1,494
Thereafter	5,869
Total	$	15,366

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8. DEPOSITS

The table below summarizes deposits by type: 

	December 31,
	2015		2014
	(in thousands)
Non-interest-bearing demand	$	4,093,976	$	2,288,048
Interest-bearing demand	1,028,073		854,935
Savings and money market	5,296,921		3,869,699
Certificate of deposit ($250,000 or more)	1,569,525		1,339,238
Other time deposits	42,129		579,123
Total deposits	$	12,030,624	$	8,931,043

The summary of the contractual maturities for all time deposits as of December 31, 2015 is as follows: 

	December 31, 2015
	(in thousands)
2016	$	1,507,050
2017	88,184
2018	9,633
2019	3,552
2020	3,235
Total	$	1,611,654

WAB is a member of CDARS and ICS, which provide mechanisms for obtaining FDIC insurance on large deposits. Federal banking law and regulation places restrictions on depository institutions regarding brokered deposits because of the general concern that these deposits are not relationship based and are at a greater risk of being withdrawn, thus posing liquidity risk for institutions that gather brokered deposits in significant amounts. At December 31, 2015 and 2014, the Company had $517.5 million and $700.7 million, respectively, of reciprocal CDARS deposits and $714.4 million and $481.2 million, respectively, of ICS deposits. At December 31, 2015 and 2014, the Company had $184.2 million and $257.0 million, respectively, of wholesale brokered deposits. There were also $365.6 million and $202.4 million of additional deposits as of December 31, 2015 and 2014, respectively, that the Company considers core deposits, but which are classified as brokered deposits for regulatory reporting purposes.

9. OTHER BORROWINGS

The following table summarizes the Company’s borrowings as of December 31, 2015 and 2014: 

	December 31,
	2015		2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	150,000		96,987
Other short-term debt	—		58,182
Total short-term borrowings	$	150,000	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

The Company maintains other lines of credit with correspondent banks totaling $70.0 million, of which $25.0 million is secured by pledged securities and has a floating interest rate of one-month or three-month LIBOR plus 1.50%. The remaining $45.0 million is unsecured and has a floating interest rate of one-month LIBOR plus 3.25%. As of December 31, 2015, there

124

were no outstanding balances on the Company's lines of credit. At December 31, 2014, the Company had revolving lines of credit with other institutions with outstanding advances totaling $25.0 million, at an interest rate of 1.75%. In addition, the Bank has entered into federal funds credit line agreements with correspondent banks under which it can borrow up to $100.0 million on an unsecured basis at the federal funds rate in effect at the time of borrowing. There were no amounts outstanding on these lines of credit as of December 31, 2015 and 2014. The lending institutions will determine the interest rate charged on funds at the time of the borrowing.

The Company maintains lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. At December 31, 2015, there were $150.0 million in short-term FHLB advances, consisting primarily of overnight advances. The weighted average interest rate on these FHLB advances as of December 31, 2015 was 0.36%. At December 31, 2014, short-term FHLB advances of $97.0 million had a weighted average interest rate of 1.24%.

At December 31, 2014, Senior Notes had a carrying value of $58.2 million. During the year ended December 31, 2015, the Senior Notes matured, resulting in a $58.2 million decrease to other short-term debt.

During 2015, the Company paid off $200.0 million of FHLB advances classified as long-term for a loss on extinguishment of $0.1 million. As of December 31, 2014, long-term FHLB advances of $210.1 million had a weighted average interest rate of 1.06%.

As of December 31, 2015 and 2014, the Company had additional available credit with the FHLB of approximately $1.54 billion and $935.0 million, respectively, and with the FRB of approximately $1.21 billion and $1.15 billion, respectively.

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10. QUALIFYING DEBT

Subordinated Debt

On June 29, 2015, the Company issued $150.0 million of subordinated debt, which was recorded net of debt issuance costs of $1.8 million, and matures July 15, 2025. The subordinated debt has a fixed interest rate of 5.00% through June 30, 2020 and then converts to a variable rate of 3.20% plus three-month LIBOR through maturity. The carrying value of subordinated debt also includes the effective portion of related hedges and is $152.0 million at December 31, 2015.

Junior Subordinated Debt

The Company has formed or acquired through mergers, eight statutory business trusts, including two new business trusts, Bridge Capital Trust I and Bridge Capital Trust II, acquired in the acquisition of Bridge on June 30, 2015. These trusts exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities. All of the funds raised from the issuance of these securities were passed to the Company and are reflected in the accompanying Consolidated Balance Sheets as junior subordinated debt, with a carrying value of $58.4 million as of December 31, 2015.

The junior subordinated debt has contractual balances and maturity dates as follows: 

		December 31,
Name of Trust	Maturity	2015			2014
At fair value		(in thousands)
BankWest Nevada Capital Trust II	2033	$	15,464		$	15,464
Intermountain First Statutory Trust I	2034	10,310			10,310
First Independent Statutory Trust I	2035	7,217			7,217
WAL Trust No. 1	2036	20,619			20,619
WAL Statutory Trust No. 2	2037	5,155			5,155
WAL Statutory Trust No. 3	2037	7,732			7,732
Total contractual balance		66,497			66,497
FVO on junior subordinated debt		(19,569		)	(26,060		)
Junior subordinated debt, at fair value		$	46,928		$	40,437
At amortized cost
Bridge Capital Holdings Trust I	2035	$	12,372		$	—
Bridge Capital Holdings Trust II	2036	5,155			—
Total contractual balance		17,527			—
Purchase accounting adjustment, net of accretion (1)		(6,085		)	—
Junior subordinated debt, at amortized cost		$	11,442		$	—
Total junior subordinated debt		$	58,370		$	40,437

(1) The purchase accounting adjustment will be accreted over the remaining life of the trusts, pursuant to accounting guidance.

With the exception of debt issued by Bridge Capital Trust I and Bridge Capital Trust II, junior subordinated debt is recorded at fair value at each reporting date due to the FVO election made by the Company under ASC 825. The Bridge junior subordinated debt was initially recorded at a fair value of $11.3 million on June 30, 2015, which includes a fair market value purchase accounting adjustment of $6.2 million that will be accreted over the remaining life of the debt. The Company did not make the FVO election for the Bridge junior subordinated debt. Accordingly, the carrying value of these trusts at each future reporting date will not reflect the current fair value of the debt.

The weighted average interest rate of all junior subordinated debt as of December 31, 2015 was 2.95%, which is three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 2.73% at December 31, 2014.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB, the Company's securities continue to qualify as Tier 1 Capital.

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Adoption of ASU 2016-01

The following table presents the impact of the Company's election to early adopt an element of ASU 2016-01 issued by the FASB in January 2016 related to changes in the fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option for financial instruments has been elected and its retrospective application for the periods indicated. The cumulative effect of adoption of this guidance at January 1, 2015 was a decrease to retained earnings of $16.3 million and a corresponding increase to accumulated other comprehensive income.

	Sep 30, 2015		Jun 30, 2015			Mar 31, 2015
	(in thousands)
Consolidated Balance Sheet:
Stockholders' equity
Accumulated other comprehensive income
As previously reported	$	20,643	$	15,348		$	23,423
As reported under new guidance	35,276		26,707			39,538
Retained earnings
As previously reported	218,897		159,939			125,467
As reported under new guidance	204,264		148,580			109,352
	Three Months Ended
	Sep 30, 2015		Jun 30, 2015			Mar 31, 2015
	(in thousands, except per share data)
Consolidated Income Statement:
Non-interest income
As previously reported	$	13,826	$	(2,191	)	$	5,933
As reported under new guidance	8,502		5,545			6,242
Income tax expense
As previously reported	19,183		10,599			14,118
As reported under new guidance	17,133		13,579			14,234
Net income
As previously reported	59,134		34,719			40,190
As reported under new guidance	55,860		39,475			40,383
Net income available to common shareholders
As previously reported	58,958		34,472			40,014
As reported under new guidance	55,684		39,228			40,207
Earnings per share applicable to common shareholders--basic
As previously reported	0.59		0.39			0.46
As reported under new guidance	0.55		0.44			0.46
Earnings per share applicable to common shareholders--diluted
As previously reported	0.58		0.39			0.45
As reported under new guidance	0.55		0.44			0.45

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11. STOCKHOLDERS' EQUITY

Preferred Stock

On September 27, 2011, the Company received $141.0 million from the issuance of 141,000 shares of non-cumulative perpetual preferred stock, Series B, par value of $0.0001 per share and a liquidation preference of $1,000 per share, to the U.S. Treasury Department under the SBLF.

On December 31, 2014, the Company redeemed 70,500 of its 141,000 shares of non-cumulative perpetual preferred stock, Series B. The shares were redeemed at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

On December 18, 2015, the Company redeemed its remaining 70,500 shares of non-cumulative perpetual preferred stock, Series B. The shares were redeemed at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

Common Stock Issuance

In Connection with Bridge Acquisition

Under the terms of the Bridge merger agreement, each share of Bridge common stock issued and outstanding as of June 30, 2015, the acquisition date, was exchanged for 0.8145 shares of WAL common stock and $2.39 in cash. This resulted in the issuance of 12,451,240 shares, or $420.4 million, of the Company's common stock and payment of $36.5 million in cash.

Under ATM Distribution Agreement

On June 4, 2014, the Company entered into a distribution agency agreement with Credit Suisse Securities (USA) LLC, under which the Company may sell shares of its common stock up to an aggregate offering price of $100.0 million on the New York Stock Exchange. The parties executed an Amended and Restated Distribution Agency Agreement on October 30, 2014. The Company pays Credit Suisse Securities (USA) LLC a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary.

Sales in the ATM offering were previously being made pursuant to a prospectus dated May 14, 2012 and a prospectus supplement filed with the SEC on June 4, 2014, in connection with one or more offerings of shares from the Company's shelf registration statement on Form S-3 (No. 333-181128), which expired on May 14, 2015. On May 7, 2015, the Company filed with the SEC a new shelf registration statement on Form S-3 (No. 333-203959). During the year ended December 31, 2015, the Company sold 760,376 shares under the ATM offering at a weighted-average selling price of $38.13 per share for gross proceeds of $29.0 million. Total related offering costs were $0.7 million, of which $0.5 million relates to compensation costs paid to Credit Suisse Securities (USA) LLC. During the year ended December 31, 2014, the Company sold 548,122 shares under the ATM offering at a weighted-average selling price of $25.96 per share for gross proceeds of $14.2 million. Total related offering costs were $0.5 million, of which $0.2 million relates to compensation costs paid to Credit Suisse Securities (USA) LLC.

Stock-Based Compensation

Equity Awards Assumed in Bridge Acquisition

In connection with the Bridge acquisition, the Company assumed unvested restricted stock awards and stock options originally granted by Bridge and converted them into WAL restricted stock awards and stock options. Bridge equity awards were converted into WAL equity awards at a conversion ratio of 0.905, resulting in the issuance of 546,151 shares of WAL restricted stock and 213,091 of WAL options. The portion of the fair value of these equity awards associated with prior service of Bridge employees represents a component of the total consideration for the Bridge acquisition, which totaled $10.7 million.

Bridge's restricted stock awards generally had an original vesting period of five years. The remaining vesting period of these awards remained unchanged upon conversion. The value of restricted stock replacement awards were based on WAL's stock price as of the acquisition date and totaled $17.0 million as of June 30, 2015, of which $9.0 million is considered purchase price consideration for pre-combination service and $8.0 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the awards. During the year ended December 31, 2015, the Company recognized $1.7 million in compensation expense related to these awards.

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Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

The value of assumed stock options as of June 30, 2015 totaled $4.1 million, of which $1.7 million is considered purchase price consideration for pre-combination service and $2.4 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the options. During the year ended December 31, 2015, the Company recognized $0.5 million in compensation expense related to these awards.

Stock Awards and Stock Options

The Incentive Plan, as amended, gives the Board of Directors the authority to grant up to 10.5 million stock awards consisting of unrestricted stock, stock units, dividend equivalent rights, stock options (incentive and non-qualified), stock appreciation rights, restricted stock, and performance and annual incentive awards. Stock awards available for grant at December 31, 2015 were 3.2 million.

The Incentive Plan contains certain individual limits on the maximum amount that can be paid in cash under the Incentive Plan and on the maximum number of shares of common stock that may be issued pursuant to the Incentive Plan in a calendar year. In 2012, stockholders approved an amendment to the Incentive Plan that 1) increased by 2,000,000 the maximum number of shares available for issuance thereunder; 2) increased the maximum number of shares of stock that can be awarded to any person eligible for an award thereunder to 300,000 per calendar year; and 3) provided for additional business criteria upon which performance-based awards may be based thereunder. In 2014, stockholders approved an amendment to the Incentive Plan that increased the maximum number of shares available for issuance by 2,000,000.

Restricted stock awards granted to employees in 2015 and 2014 generally vest over a three-year period. Stock grants made to non-employee WAL and WAB directors during 2015 includes both the annual grant that was fully vested at June 30, 2015 and a special grant to WAB directors that immediately vested in December 2015. The Company estimates the compensation cost for stock grants based upon the grant date fair value. Stock compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the stock issued during the year ended December 31, 2015 was $12.6 million. For the year ended December 31, 2015, the Company recognized $9.3 million in stock-based compensation expense related to these stock grants, compared to $6.8 million in 2014.

In addition, the Company granted 52,200 shares of restricted stock to certain members of executive management that have both performance and service conditions that affect vesting. The performance condition was based on achieving an EPS target for fiscal year 2015. This EPS target was met as of December 31, 2015 and therefore the restricted stock awards will vest over a remaining two-year service period. The grant date fair value of the awards was $1.4 million. For the year ended December 31, 2015, the Company recognized $0.5 million in stock-based compensation expense related to these performance-based restricted stock grants, compared to no such stock-based compensation expense in 2014 or 2013.

129

A summary of the status of the Company’s unvested shares of restricted stock, including those issued in connection with the Bridge acquisition, and changes during the years then ended is presented below: 

	December 31,
	2015				2014
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
	(in thousands, except per share amounts)
Balance, beginning of period	1,050		$	16.19	1,204		$	9.71
Granted	509		27.55		508		23.90
Issued in acquisition of Bridge	546		14.70		—		—
Vested	(528	)	13.02		(566	)	9.57
Forfeited	(85	)	21.63		(96	)	15.05
Balance, end of period	1,492		$	20.46	1,050		$	16.19

The weighted average grant date fair value of stock awards granted during the years ended December 31, 2015, 2014, and 2013 was $12.6 million, $12.2 million, and $6.7 million, respectively. The total fair value of restricted stock that vested during the years ended December 31, 2015, 2014, and 2013 was $14.6 million, $13.3 million, and 6.8 million, respectively.

As of December 31, 2015, there was $18.5 million of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Incentive Plan. That cost is expected to be recognized over a weighted average period of 2.19 years.

As of December 31, 2015, the Company has stock option awards outstanding related to options granted in 2011 as well as stock option awards converted in connection with the Bridge acquisition. The options granted in 2011 had a vesting period of 4 years, a contractual life of 7 years, and became fully vested in January 2015. The fair value of each option award was estimated on the date of grant using the Black-Scholes option valuation model. A summary of option activity during the year ended December 31, 2015 is presented below: 

	December 31, 2015
	Shares		Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
	(in thousands, except exercise price and contractual terms)
Outstanding options, beginning of period	217		$	9.70
Granted	—		—
Issued in acquisition of Bridge	213		22.02
Exercised	(182	)	10.62
Forfeited or expired	(24	)	23.89
Options outstanding, end of period	224		$	19.15	6.41	$	3,738
Options exercisable, end of period	94		$	11.72	3.67	$	2,278
Options expected to vest, end of period	97		$	24.49	8.38	$	1,691

The total intrinsic value of options exercised during the years ended December 31, 2015, 2014, and 2013 was $3.6 million, $7.1 million, and $2.8 million, respectively.

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Performance Stock Units

The Company grants members of its executive management committee performance stock units that do not vest unless the Company achieves a specified cumulative EPS target over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. For the year ended December 31, 2015, the Company recognized $4.8 million in stock-based compensation expense related to these performance stock units, compared to $3.6 million in stock-based compensation expense for such units in 2014.

The three-year performance period for the 2012 grant ended on December 31, 2014, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, on February 18, 2015, executive management committee members were granted 285,000 of fully vested common shares.

The three-year performance period for the 2013 grant ended on December 31, 2015, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, 308,400 shares will become fully vested and be paid out to members of the executive management committee in February 2016.

As of December 31, 2015, outstanding performance stock unit grants made in 2014 and 2015 are expected to pay out at the maximum award amount, or 414,650 common shares.

12. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Unrealized gain on cash flow hedge			Total
	(in thousands)
Balance, December 31, 2012	$	8,065		$	—	$	—		$	144	$	17		$	8,226
Other comprehensive income before reclassifications	(30,503		)	—		—			—		(17		)	(30,520		)
Amounts reclassified from accumulated other comprehensive income	748			—		—			—		—			748
Net current-period other comprehensive (loss)	(29,755		)	—		—			—		(17		)	(29,772		)
Balance, December 31, 2013	$	(21,690	)	$	—	$	—		$	144	$	—		$	(21,546	)
Transfer of HTM securities to AFS	8,976			—		—			—		—			8,976
Other comprehensive income before reclassifications	29,683			—		—			—		—			29,683
Amounts reclassified from accumulated other comprehensive income	(474		)	—		—			—		—			(474		)
Net current-period other comprehensive income	38,185			—		—			—		—			38,185
Balance, December 31, 2014	$	16,495		$	—	$	—		$	144	$	—		$	16,639
Balance, January 1, 2015 (1)	16,495			—		16,309			144		—			32,948
Transfer of HTM securities to AFS	—			—		—			—		—			—
Other comprehensive income before reclassifications	(6,117		)	90		(4,276		)	—		—			(10,303		)
Amounts reclassified from accumulated other comprehensive income	(385		)	—		—			—		—			(385		)
Net current-period other comprehensive (loss) income	(6,502		)	90		(4,276		)	—		—			(10,688		)
Balance, December 31, 2015	$	9,993		$	90	$	12,033		$	144	$	—		$	22,260

(1)    As adjusted, see "Note 10. Qualifying Debt" for further discussion.

131

The following table presents reclassifications out of accumulated other comprehensive income: 

	Year Ended December 31,
Income Statement Classification	2015			2014			2013
	(in thousands)
Gain (loss) on sales of investment securities, net	$	615		$	757		$	(1,195	)
Income tax (expense) benefit	(230		)	(283		)	447
Net of tax	$	385		$	474		$	(748	)

13. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments through its subsidiary, WAB. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary type of derivatives that the Company uses are interest rate swaps. Generally, these instruments are used to help manage the Company's exposure to interest rate risk and meet client financing and hedging needs.

Derivatives are recorded at fair value in the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

As of December 31, 2015, 2014, and 2013, the Company does not have any significant outstanding cash flow hedges or free-standing derivatives.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) to another interest rate index.

The Company designates its “pay fixed/receive variable” interest rate swaps as fair value hedges. These contracts convert certain fixed-rate long-term loan assets into variable-rate assets, thereby modifying the Company's exposure to changes in interest rates. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts.

The Company entered into a "pay variable/receive fixed" interest rate swap agreement, designated as a fair value hedge, to hedge the interest rate exposure on its subordinated debt issuance. As a result, the Company is paying a floating rate of three month LIBOR plus 3.16% and is receiving semi-annual fixed payments of 5.00% to match the payments on the debt.

132

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair values of the Company's derivative instruments on a gross and net basis as of December 31, 2015, 2014, and 2013. The change in the notional amounts of these derivatives from December 31, 2013 to December 31, 2015 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties. The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	December 31, 2015						December 31, 2014						December 31, 2013
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,386	$	788
Total	800,478		3,569		64,785		647,703		7		57,820		294,997		2,386		788
Netting adjustments (1)	—		—		—		—		—		—		—		384		384
Net derivatives in the balance sheet	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,002	$	404

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Fair value hedges

An assessment of effectiveness is performed at initiation of a hedge and on a quarterly basis thereafter. All of the Company's fair value hedges remained “highly effective” as of December 31, 2015, 2014, and 2013.

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the years ended December 31, 2015, 2014, and 2013 which are recorded in unrealized (losses) gains on assets and liabilities measured at fair value, net in the income statement.

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Hedge of Fixed Rate Loans (a)
Loss on "pay fixed" swap	$	(6,965	)	$	(60,377	)	$	3,308
Gain on receive fixed rate loans	7,044			60,208			(3,317		)
Net ineffectiveness	$	79		$	(169	)	$	(9	)
Hedge of Fixed Rate Subordinated Debt (a)
Gain on "receive fixed" swap	$	3,569		$	—		$	—
Loss on subordinated debt	(3,569		)	—			—
Net ineffectiveness	$	—		$	—		$	—

(a) The fair value of derivatives contracts are carried as other assets and other liabilities in the Consolidated Balance Sheets. The effective portion of hedging gains (losses) are recorded as basis adjustments to the underlying hedged asset or liability. Gains and losses on both the hedging derivative and hedged item are recorded through non-interest expense with a resulting net income impact for the amount of ineffectiveness.

133

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected positive replacement value of the contracts. Management generally enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types. In general, the Company has a zero credit threshold with regard to derivative exposure with counterparties. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally holds collateral in the form of highly rated securities issued by the U.S. Treasury or government-sponsored enterprises, such as GNMA, FNMA, and FHLMC. The total collateral netted against net derivative liabilities totaled $61.7 million at December 31, 2015, $57.8 million at December 31, 2014, and $0.3 million at December 31, 2013.

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	December 31,
	2015		2014		2013
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	3,569	$	7	$	2,378
Collateral posted by this counterparty	4,680		—		2,002
Derivative liability with this counterparty	—		—		346
Collateral pledged to this counterparty	1,340		—		—
Net exposure after netting adjustments and collateral	$	229	$	7	$	—

Credit Risk Contingent Features

Management has entered into certain derivative contracts that require the Company to post collateral to the counterparties when these contracts are in a net liability position. Conversely, the counterparties post collateral when these contracts are in a net asset position. The amount of collateral to be posted is based on the amount of the net liability and exposure thresholds. As of December 31, 2015, 2014, and 2013 the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting provisions) held by the Company that were in a net liability position totaled $64.8 million, $57.8 million, and $0.4 million, respectively. As of December 31, 2015, the Company was in an over-collateralized net position of $15.5 million after considering $77.2 million of collateral held in the form of securities. As of December 31, 2014 and 2013, the Company was in an over-collateralized position of $14.2 million and $12.4 million, respectively.

14. EARNINGS PER SHARE

Diluted EPS is based on the weighted average outstanding common shares during each period, including common stock equivalents. Basic EPS is based on the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands, except per share amounts)
Weighted average shares - basic	94,570		86,693		85,682
Dilutive effect of stock awards	649		813		859
Weighted average shares - diluted	95,219		87,506		86,541
Net income available to common stockholders	$	193,494	$	146,564	$	113,555
Earnings per share - basic	2.05		1.69		1.33
Earnings per share - diluted	2.03		1.67		1.31

The Company had zero, 1,500, and 163,300 stock options outstanding as of December 31, 2015, 2014, and 2013, respectively, which were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive.

134

15. INCOME TAXES

The provision for income taxes charged to operations consists of the following: 

	Year Ended December 31,
	2015		2014			2013
	(in thousands)
Current	$	61,040	$	55,572		$	43,547
Deferred	3,254		(7,182		)	(13,717		)
Total tax provision	$	64,294	$	48,390		$	29,830

The reconciliation between the statutory federal income tax rate and the Company’s effective tax rate are summarized as follows: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Income tax at statutory rate	$	90,489		$	69,125		$	50,979
Increase (decrease) resulting from:
State income taxes, net of federal benefits	5,783			4,904			3,016
Bank owned life insurance	(1,365		)	(1,578		)	(1,683		)
Tax-exempt income	(20,226		)	(15,006		)	(7,308		)
Deferred tax asset valuation allowance	(2,290		)	(2,104		)	(2,391		)
Bargain purchase gain	—			—			(3,775		)
Low income housing tax credits	(5,223		)	(3,872		)	(2,105		)
Tax benefit related to Western Liberty acquisition	—			—			(3,738		)
Other, net	(2,874		)	(3,079		)	(3,165		)
Total tax provision	$	64,294		$	48,390		$	29,830

The effective tax rate for the year ended December 31, 2015 was 24.87%, compared to 24.50% for the year ended December 31, 2014, and 20.48% for the year ended December 31, 2013. There was not a significant change in the effective tax rate from 2014 compared to 2015. The increase in the effective tax rate from 2013 compared to 2014 is primarily due to the increase in pre-tax book income and the absence of acquisition related benefits for the year ended December 31, 2014 compared to 2013.

135

The cumulative tax effects of the primary temporary differences are shown in the following table:

	December 31,
	2015			2014
	(in thousands)
Deferred tax assets:
Allowance for credit losses	$	47,431		$	42,038
Fair market value adjustment related to acquired loans	13,930			8,250
Stock-based compensation	12,069			4,749
Net operating loss carryovers	9,255			8,453
Tax credit carryovers	9,052			9,617
Startup costs and other amortization	4,771			5,113
Allowance for other assets acquired through foreclosure, net	4,280			7,343
Section 382 limited NUBILs	3,284			3,657
Other	13,686			8,188
Total gross deferred tax assets	117,758			97,408
Deferred tax asset valuation allowance	—			(2,290		)
Total deferred tax assets	117,758			95,118
Deferred tax liabilities:
Unrealized gain on debt instruments measured at fair value	(7,537		)	—
Deferred loan costs	(7,400		)	(6,041		)
Unrealized gain on AFS securities	(6,353		)	(9,949		)
Core deposit intangible	(6,093		)	(1,006		)
Premises and equipment	(2,039		)	(4,049		)
Unrealized gains on financial instruments measured at fair value	(1,000		)	(9,798		)
Other	(984		)	(1,589		)
Total deferred tax liabilities	(31,406		)	(32,432		)
Deferred tax assets, net	$	86,352		$	62,686

Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be reversed. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

For the year ended December 31, 2015, the net deferred tax assets increased$23.7 million to $86.4 million. This overall increase in the net deferred tax asset was primarily the result of increases to deferred tax assets from the effects of the Bridge acquisition; a change in fair market value of junior subordinated debt and AFS securities; and the increase in the allowance for credit losses.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $86.4 million at December 31, 2015 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies within the meaning of ASC 740, Income Taxes, that could be implemented if necessary to prevent a carryover from expiring.

As of December 31, 2015 and 2014, the Company had a deferred tax valuation allowance of zero and $1.8 million, respectively, related to net capital loss carryovers from the sale of preferred stock investments and zero and $0.5 million, respectively, related to IRC Section 382 limitations associated with the Company's acquisition of Western Liberty.

The deferred tax asset related to federal and state NOL carryovers outstanding at December 31, 2015 and 2014 available to reduce the tax liability in future years totaled $9.3 million and $8.5 million, respectively. The respective $9.3 million and $8.5 million of tax benefits relate entirely to federal NOL carryovers (subject to an annual limitation imposed by IRC Section 382). The Company’s ability to use federal NOL carryovers, as well as its ability to use certain future tax deductions called NUBILs associated with the Company's acquisitions of Western Liberty and Centennial, will be subject to separate annual limitations of $1.8 million and $1.6 million of deductions from taxable income, respectively. In management’s opinion, it is more-likely-than-not that the results of future operations will generate sufficient taxable income to realize all of the deferred tax benefits related to these NOL carryovers and NUBILs.

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The Company files income tax returns in the U.S. federal jurisdiction and in various states. With few exceptions, the Company is no longer subject to U.S. federal, state, or local income tax examinations by tax authorities for years before 2011.

When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the Consolidated Financial Statements in the period in which, based on all available evidence, management believes it is more-likely-than-not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50% likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above would be reflected as a liability for unrecognized tax benefits in the accompanying Consolidated Balance Sheet along with any associated interest and penalties that would be payable to the taxing authorities upon examination.

The total gross activity of unrecognized tax benefits related to uncertain tax positions are shown in the following table:

	December 31,
	2015		2014
	(in thousands)
Beginning balance	$	—	$	—
Gross Increases
Tax positions in prior periods	1,038		—
Current period tax positions	—		—
Gross decreases
Tax positions in prior periods	—		—
Settlements	—		—
Lapse of statute of limitations	—		—
Ending balance	$	1,038	$	—

As of December 31, 2015, the total amount of unrecognized tax benefits, net of associated deferred tax benefit, that would impact the effective tax rate, if recognized, is $0.7 million. There were no unrecognized tax benefits as of December 31, 2014.

Interest and penalties related to unrecognized tax benefits are recognized in the provision for income taxes. During the year ended December 31, 2015, the Company recognized as part of its provision for income taxes, $0.1 million in penalties associated with unrecognized tax benefits and no amounts for interest. There were no amounts for interest and penalties recognized during the years ended December 31, 2014 and 2013.

As of December 31, 2015, the Company has accrued a $0.1 million liability for penalties and a $0.1 million liability for interest. As of December 31, 2014, there were no amounts accrued for interest or penalties.

Investments in LIHTC

The Company invests in LIHTC funds that are designed to generate a return primarily through the realization of federal tax credits.

Investments in LIHTC and unfunded LIHTC obligations are included as part of other assets and other liabilities, respectively, in the Consolidated Balance Sheets and total $152.7 million and $61.2 million, respectively, as of December 31, 2015, compared to $126.6 million and $51.4 million as of December 31, 2014. For the years ended December 31, 2015, 2014, and 2013, $14.4 million, $10.6 million, and $5.9 million of amortization related to LIHTC investments was recognized as a component of income tax expense, respectively.

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16. COMMITMENTS AND CONTINGENCIES

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheets.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of standby letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the standby letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Standby letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within one year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	December 31,
	2015		2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $341,374 at December 31, 2015 and $232,863 at December 31, 2014	$	3,624,578	$	2,164,523
Credit card commitments and financial guarantees	57,966		42,038
Standby letters of credit, including unsecured letters of credit of $4,257 at December 31, 2015 and $5,166 at December 31, 2014	50,659		49,556
Total	$	3,733,203	$	2,256,117

The following table represents the contractual commitments for lines and letters of credit by maturity at December 31, 2015: 

			Amount of Commitment Expiration per Period
	Total Amounts Committed		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
	(in thousands)
Commitments to extend credit	$	3,624,578	$	1,588,558	$	1,401,293	$	267,284	$	367,443
Credit card commitments and financial guarantees	57,966		57,966		—		—		—
Standby letters of credit	50,659		42,749		5,749		2,161		—
Total	$	3,733,203	$	1,689,273	$	1,407,042	$	269,445	$	367,443

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are not included in the allowance for credit losses reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Consolidated Financial Statements and are accounted for as a separate loss contingency. This loss contingency for unfunded loan

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commitments and letters of credit was $3.3 millionand $2.1 million as of December 31, 2015 and 2014, respectively. Changes to this liability are adjusted through non-interest expense.

Concentrations of Lending Activities

The Company’s lending activities are driven in large part by the customers served in the market areas where the Company has branch offices in the states of Arizona, Nevada, and California. Despite the geographic concentration of lending activities, the Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations within four broad categories: geography, industry, product, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of December 31, 2015 and 2014, CRE related loans accounted for approximately 49% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at December 31, 2015 and 2014, respectively.

Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Other

The Company has entered into change in control agreements with certain named executives and other employees designated as executives by the Board of Directors. Under these agreements, in the event of a qualifying termination, each executive is entitled to receive 1) accrued benefits, payable in accordance with the Company’s normal payroll practice; 2) a lump sum cash severance payment in an amount equal to the sum of a) two times the executive’s annual base salary plus b) two times the executive's annual bonus; 3) any unpaid bonus that was earned by the executive in the prior year; and 4) reimbursement of paid group health premiums up to 24 months.

17. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Consolidated Financial Statements.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels in the fair value hierarchy are recognized as of the end of the month following the event or change in circumstances that caused the transfer.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and results in the recognition of unrealized gains and losses on these items in earnings at each reporting date. The Company did not elect FVO treatment for assumed Bridge junior subordinated debt.

All securities for which the fair value measurement option had been elected are included in a separate line item in the Consolidated Balance Sheets as securities measured at fair value.

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For the years ended December 31, 2015, 2014, and 2013 securities gains and losses from fair value changes were as follows:

	Changes in Fair Values for Items Measured at Fair Value Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings			Total Changes Included in OCI (1)
	(in thousands)
Year Ended December 31, 2015
Securities measured at fair value	$	(32	)	$	2	$	—		$	(30	)	$	—
Junior subordinated debt	(6,491		)	—		(2,151		)	(2,151		)	(4,276		)
Total	$	(6,523	)	$	2	$	(2,151	)	$	(2,181	)	$	(4,276	)
Year Ended December 31, 2014
Securities measured at fair value	$	(41	)	$	7	$	—		$	(34	)	$	—
Junior subordinated debt	1,421			—		(1,754		)	(333		)	—
Total	$	1,380		$	7	$	(1,754	)	$	(367	)	$	—
Year Ended December 31, 2013
Securities measured at fair value	$	(260	)	$	6	$	—		$	(254	)	$	—
Junior subordinated debt	(5,640		)	—		(1,823		)	(7,463		)	—
Total	$	(5,900	)	$	6	$	(1,823	)	$	(7,717	)	$	—

(1) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI, net of tax, rather than included in earnings, effective January 1, 2015. See Note 10. Qualifying Debt for further discussion.

There were no net gains or losses recognized during the years ended December 31, 2015, 2014, and 2013 on trading securities sold during the period.

Interest income on securities measured at fair value is accounted for similarly to those classified as AFS. Any premiums or discounts are recognized in interest income over the term of the securities. For MBS, estimates of prepayments are considered in the constant yield calculations. Interest expense on junior subordinated debt is also determined under a constant yield calculation.

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

Securities measured at fair value: All of the Company’s securities measured at fair value, which consist of MBS, are reported at fair value utilizing Level 2 inputs in the same manner as described below for AFS securities.

AFS securities: Preferred stock, mutual funds, and CRA investments are reported at fair value utilizing Level 1 inputs. With the exception of CDO securities, other securities classified as AFS are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things. The Company estimates the fair value of CDO securities utilizing Level 3 inputs, which include pricing indications from comparable securities.

Independent pricing service: Our independent pricing service provides pricing information on Level 1, 2, and 3 securities, and represents the pricing source for the majority of the portfolio. Management independently evaluates the fair value measurements received from the Company's third party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities' valuations from the previous quarter. Then, management obtains market values from additional sources. The pricing service provides management with observable market data including interest rate curves and mortgage prepayment speed grids, as well as dealer quote sheets, new bond offering sheets, and historical trade documentation. Management reviews the assumptions and decides whether they are reasonable. Management may compare interest rates, credit spreads, and prepayments speeds used as part of the assumptions to those that management believes are reasonable. Management may price securities using the provided assumptions to determine whether they can develop similar prices on like securities. Any discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and the Company’s other valuation advisors. Lastly, management selects a sample of

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investment securities and compares the values provided by its primary third party pricing service to the market values obtained from secondary sources and evaluates those with notable variances.

Annually, the Company receives an SSAE 16 report from its independent pricing service attesting to the controls placed on the operations of the service from its auditor.

Interest rate swaps: Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates that it will pay the debt according to its contractual terms.

As of March 31, 2015, junior subordinated debt issued by the parent was valued under an NPV approach with a discount rate equal to a derived credit spread of 5.96% plus three-month LIBOR. Subsequently, on June 29, 2015, WAB issued $150.0 million of subordinated debt at a credit spread of 3.20% over LIBOR. Management deemed this to be a new observable market input relative to the Company's own credit risk. As of June 30, 2015, the junior subordinated debt was valued with an adjusted credit spread of 4.69%. This credit spread of 4.69% represents a reduction of 1.27% from the credit spread as of March 31, 2015, and a premium of 1.49% over the recent subordinated debt issuance by WAB, with such premium resulting from terms and features reflecting the greater level of subordination of the junior subordinated debt issued by the parent. This spread reduction resulted in a non-cash, non-recurring debt valuation loss of $7.7 million during the three months ended June 30, 2015. This charge had no effect on regulatory capital.

As of December 31, 2015, utilizing the methodology described above, the Company estimated the discount rate at 5.67%, which represents an implied credit spread of 5.06% plus three-month LIBOR (0.61%). As of December 31, 2014, the Company estimated the discount rate at 6.24%, which was a 5.99% credit spread plus three-month LIBOR (0.25%).

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The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	1,481
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,060	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		19,114
Corporate debt securities	—		13,251		—		13,251
CRA investments	34,685		—		—		34,685
Municipal obligations	—		334,830		—		334,830
Preferred stock	111,236		—		—		111,236
Private label commercial MBS	—		4,691		—		4,691
Private label residential MBS	—		257,128		—		257,128
Residential MBS issued by GSEs	—		1,170,221		—		1,170,221
Trust preferred securities	—		24,314		—		24,314
U.S. treasury securities	2,993		—		—		2,993
Total AFS securities	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Loans - HFS	$	—	$	23,809	$	—	$	23,809
Derivative assets (1)	—		3,569		—		3,569
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	46,928	$	46,928
Derivative liabilities (1)	—		64,785		—		64,785

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $64,184 and the net carrying value of subordinated debt includes a net negative value of $3,569 as of December 31, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

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	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

For the years ended December 31, 2015, 2014, and 2013, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Beginning balance	$	(40,437	)	$	(41,858	)	$	(36,218	)
Transfers into Level 3	—			—			—
Total gains (losses) for the period
Included in earnings (1)	—			1,421			(5,640		)
Included in other comprehensive income (2)	$	(6,491	)	$	—		$	—
Ending balance	$	(46,928	)	$	(40,437	)	$	(41,858	)

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, total losses for 2015 are included in the other comprehensive income line, Unrealized gain (loss) on junior subordinated debt, which is net of tax. The above amount represents the gross loss from changes in fair value of junior subordinated debt.

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	CDO Securities
	Year Ended December 31,
	2015			2014		2013
	(in thousands)
Beginning balance	$	11,445		$	—	$	—
Transfers into Level 3	—			6,243		—
Total gains (losses) for the period
Included in other comprehensive income (3)	(1,385		)	5,202		—
Ending balance	$	10,060		$	11,445	$	—

(3) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized gain (loss) on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	December 31, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	46,928	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,060		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of December 31, 2015 was the "BB" rated financial over SWAP index and, as of December 31, 2014, was the "BB" rated 20-Year over Treasury Index with comparable credit spread. The input value used in the fair value measurement of the Company's junior subordinated debt was 5.67% and 6.24% as of December 31, 2015 and 2014, respectively.

The significant unobservable inputs used in the fair value measurement of the Company's CDO securities include securities terms, conditions, and underlying collateral type, as well as trustee and servicer reports, trade data on comparable securities, and market quotes that are converted into spreads to benchmark LIBOR curves. Significant increases or decreases in these inputs could result in significantly different fair value measurements.

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Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of December 31, 2015:
Impaired loans with specific valuation allowance	$	19,629	$	—	$	—	$	19,629
Impaired loans without specific valuation allowance (1)	66,754		—		—		66,754
Other assets acquired through foreclosure	43,942		—		—		43,942
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $37.8 million and $3.8 million as of December 31, 2015 and 2014, respectively.

Impaired loans: The specific reserves for collateral dependent impaired loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on third-party appraisals. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal (which are generally obtained every twelve months), age of comparables included in the appraisal, and known changes in the market and in the collateral. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. These Level 3 impaired loans had an estimated fair value of $24.3 million and $124.9 million at December 31, 2015 and 2014, respectively. The fair value of these Level 3 impaired loans reflects the carrying value of each loan, which has been reduced by any deficit in appraised value compared to book value, estimated disposition costs, and estimated losses of similar impaired loans based on historical loss experience. Specific reserves in the allowance for loan losses for these loans were $4.7 million and $10.8 million at December 31, 2015 and 2014, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every twelve months. There is risk for subsequent volatility. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $43.9 million and $57.2 million of such assets at December 31, 2015 and 2014, respectively. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement.

Credit vs. non-credit losses

Under the provisions of ASC 320, Investments-Debt and Equity Securities, OTTI is separated into the amount of total impairment related to the credit loss and the amount of the total impairment related to all other factors. The amount of the total OTTI related to the credit loss is recognized in earnings. The amount of the total impairment related to all other factors is recognized in OCI.

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For the years ended December 31, 2015, 2014, and 2013, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of December 31, 2015 and 2014.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of the Company’s financial instruments is as follows: 

	December 31, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,982,523	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Trading	1,481		—		1,481		—		1,481
Derivative assets	3,569		—		3,569		—		3,569
Loans, net	11,017,595		—		10,766,826		86,383		10,853,209
Accrued interest receivable	54,445		—		54,445		—		54,445
Financial liabilities:
Deposits	$	12,030,624	$	—	$	12,034,199	$	—	$	12,034,199
Customer repurchases	38,155		—		38,155		—		38,155
FHLB advances	150,000		—		150,000		—		150,000
Qualifying debt	210,328		—		—		207,437		207,437
Derivative liabilities	64,785		—		64,785		—		64,785
Accrued interest payable	13,626		—		13,626		—		13,626

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Qualifying debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments as well as its future net interest income will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from

146

hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits. As of December 31, 2015, the Company’s interest rate risk profile was within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to prohibit an interest rate risk profile that does not conform to both management and BOD risk tolerances. There is also ALCO reporting at the Parent company level for reviewing interest rate risk for the Company, which gets reported to the BOD and the Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at December 31, 2015 and 2014 was insignificant. Loan commitments on which the committed interest rates were less than the current market rate were also insignificant at December 31, 2015 and 2014.

18. REGULATORY CAPITAL REQUIREMENTS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of Common Equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

As of December 31, 2015 and 2014, the Company and the Bank exceeded the capital levels necessary to be classified as well-capitalized, as defined by the federal banking agencies. The actual capital amounts and ratios for the Company and the Bank are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
December 31, 2015
WAL	$	1,603,472	$	1,341,011	$	13,193,563	$	13,683,148	12.2	%	10.2	%	9.8	%	9.7	%
WAB	1,485,070		1,213,304		13,073,394		13,561,251		11.4		9.3		9.0		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

19. EMPLOYEE BENEFIT PLANS

The Company has a qualified 401(k) employee benefit plan for all eligible employees. Participants are able to defer between 1% and 100% (up to a maximum of $18,000 for those under 50 years of age and up to a maximum of $24,000 for those over 50 years of age in 2015) of their annual compensation. The Company may elect to match a discretionary amount each year, which

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was 50% of the first 6% of the participant’s compensation deferred into the plan. The Company’s total contribution was $2.2 million, $1.7 million, and $1.7 million for the years ended December 31, 2015, 2014, and 2013, respectively.

In addition, the Company maintains a non-qualified 401(k) restoration plan for the benefit of executives of the Company and certain affiliates. Participants are able to defer a portion of their annual salary and receive a matching contribution based primarily on the contribution structure in effect under the Company’s 401(k) plan, but without regard to certain statutory limitations applicable under the 401(k) plan. The Company’s total contribution to the restoration plan was $68,000, $77,000, and $64,000 for the years ended December 31, 2015, 2014, and 2013, respectively.

In connection with the Bridge acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge officers based on years of service and final average salary. The Company uses a December 31st measurement date for this plan.

The following table reflects the accumulated benefit obligation and funded status of the SERP from the June 30, 2015 acquisition date through December 31, 2015.

	Six Months Ended December 31, 2015
	(in thousands)
Change in benefit obligation
Benefit obligation at acquisition	$	7,122
Service cost	334
Interest cost	202
Actuarial (gains)/losses	(147		)
Expected benefits paid	(67		)
Projected benefit obligation at end of year	$	7,444
Unfunded projected/accumulated benefit obligation	(7,444		)
Additional liability	$	—
Weighted average assumptions to determine benefit obligation
Discount rate	5.75		%
Rate of compensation increase	4.00		%

The components of net periodic benefit cost recognized from the acquisition date through December 31, 2015 and the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost during 2016 are as follows:

	2016			Six Months Ended December 31, 2015
	(in thousands)
Components of net periodic benefit cost
Service cost	$	596		$	334
Interest cost	426			202
Amortization of prior service cost	96			60
Amortization of actuarial (gains)/losses	(96		)	(18		)
Net periodic benefit cost	$	1,022		$	578
Other comprehensive income (cost)	$	—		$	42

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20. RELATED PARTY TRANSACTIONS

Principal stockholders, directors, and executive officers of the Company, together with the companies they control, are considered to be related parties. In the ordinary course of business, the Company has engaged in various related party transactions during the year, ranging from extending credit, accepting deposits as well as exchange of service transactions.

Federal banking regulations require that any such extensions of credit not be offered on terms more favorable than would be offered to non-related party borrowers of similar creditworthiness. The following table summarizes the aggregate activity in such loans for the periods indicated:

	Year Ended December 31,
	2015			2014
	(in thousands)
Balance, beginning	$	70,570		$	30,783
New loans	10,678			35,341
Advances	18,614			23,559
Repayments and other	(25,481		)	(19,113		)
Balance, ending	$	74,381		$	70,570

None of these loans are past due, on non-accrual status or have been restructured to provide a reduction or deferral of interest or principal because of deterioration in the financial position of the borrower. There were no loans to a related party that were considered classified loans at December 31, 2015 or 2014. The interest income associated with these loans was approximately $2.7 million and $1.9 million for the years ended December 31, 2015 and 2014, respectively.

Loan commitments outstanding with related parties totaled approximately $164.5 million and $151.8 million at December 31, 2015 and 2014, respectively.

The Company also accepts deposits from related parties which totaled $76.0 million and $47.7 million at December 31, 2015 and 2014, respectively, with related interest expense totaling less than $100 thousand during each of the years ended December 31, 2015 and 2014. In addition, the Company engages in certain activities with related parties for sponsorships, donations, and other services during the normal course of business. Those expenses totaled less than $1.0 million for the year ended December 31, 2015 and less than $2.0 million for the year ended December 31, 2014.

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21. PARENT COMPANY FINANCIAL INFORMATION

The condensed financial statements of the holding company are presented in the following tables:

WESTERN ALLIANCE BANCORPORATION

Condensed Balance Sheets

	December 31,
	2015		2014
	(in thousands)
ASSETS:
Cash and cash equivalents	$	7,627	$	11,855
Money market investments	122		451
Investment securities - AFS	50,507		51,335
Investment in bank subsidiaries	1,522,245		987,882
Investment in non-bank subsidiaries	2,424		9,827
Loans, net of deferred loan fees and costs and allowance for credit losses	35,635		39,221
Other assets acquired through foreclosure, net	14,471		16,318
Other assets	19,378		9,912
Total assets	$	1,652,409	$	1,126,801
LIABILITIES AND STOCKHOLDERS' EQUITY:
Other borrowings	$	—	$	83,182
Qualifying debt	58,370		40,437
Accrued interest and other liabilities	2,537		2,254
Total liabilities	60,907		125,873
Total stockholders’ equity	1,591,502		1,000,928
Total liabilities and stockholders’ equity	$	1,652,409	$	1,126,801

WESTERN ALLIANCE BANCORPORATION

Condensed Income Statements

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Income:
Dividends from subsidiaries	$	140,900	$	67,515	$	71,529
Interest income	4,593		4,381		2,847
Non-interest income	586		1,235		3,995
Total income	146,079		73,131		78,371
Expense:
Interest expense	6,671		8,776		10,833
Non-interest expense	11,397		10,348		32,001
Total expense	18,068		19,124		42,834
Income before income taxes and equity in undistributed earnings of subsidiaries	128,011		54,007		35,537
Income tax benefit	5,876		5,388		21,426
Income before equity in undistributed earnings of subsidiaries	133,887		59,395		56,963
Equity in undistributed earnings of subsidiaries	60,357		88,556		58,002
Net income	194,244		147,951		114,965
Dividends on preferred stock	750		1,387		1,410
Net income available to common stockholders	$	193,494	$	146,564	$	113,555

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Western Alliance Bancorporation

Condensed Statements of Cash Flows

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	194,244		$	147,951		$	114,965
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net undistributed earnings of subsidiaries	(60,357		)	(88,556		)	(58,002		)
Excess tax benefit of stock-based compensation	(1,945		)	(4,194		)	(1,552		)
Junior subordinated debt change in fair value	—			(1,421		)	5,640
Loss on extinguishment of debt	—			502			1,387
Other operating activities, net	(4,734		)	(20,040		)	(4,011		)
Net cash provided by operating activities	127,208			34,242			58,427
Cash flows from investing activities:
Purchases of securities	—			(23,431		)	(2,044		)
Principal pay downs, calls, maturities, and sales proceeds of securities, net	2,358			8,376			6,767
Proceeds from sale of other repossessed assets, net	4,138			9,610			9,844
Capital contributions to subsidiaries	—			—			(40,000		)
Loans purchases, fundings, and principal collections, net	3,704			3,286			(35,979		)
Sale (purchase) of money market investments, net	330			2,181			(1,968		)
Sale (purchase) of premises, equipment, and other assets, net	—			617			(481		)
Net cash and cash equivalents (used) in acquisition (1)	(19,440		)	—			—
Net cash provided by (used in) investing activities	(8,910		)	639			(63,861		)
Cash flows from financing activities:
Proceeds from other borrowings, net	—			22,000			3,000
Excess tax benefit of stock-based compensation	1,945			4,194			1,552
Repayments on other borrowings	(83,444		)	(6,501		)	(10,887		)
Proceeds from issuance of common stock	28,288			13,746			—
Proceeds from exercise of stock options	1,935			8,294			4,595
Redemption of preferred stock	(70,500		)	(70,500		)	—
Cash dividends paid on preferred stock	(750		)	(1,387		)	(1,410		)
Net cash used in financing activities	(122,526		)	(30,154		)	(3,150		)
Net increase (decrease) in cash and cash equivalents	(4,228		)	4,727			(8,584		)
Cash and cash equivalents at beginning of year	11,855			7,128			15,712
Cash and cash equivalents at end of year	$	7,627		$	11,855		$	7,128
Supplemental disclosure:
Cash paid during the year for:
Interest	$	4,235		$	9,067		$	11,091
Income taxes	54,590			32,238			19,105
Non-cash investing and financing activity:
Change in unrealized gain on AFS securities, net of tax	1,199			2,031			2,450
Change in unrealized (loss) on TRUPS securities, net of tax	(4,276		)	—			—
Loan contributions to subsidiaries	183			2,663			—

(1) Cash acquired, less cash consideration paid of $36.5 million, resulted in a net $19.4 million use of cash and cash equivalents in the acquisition.

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22. SEGMENTS

The Company's reportable segments are aggregated primarily based on geographic location, services offered, and markets served. As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. As a substantial portion of Bridge's balance sheet is generated from nationally-focused business lines, the operations of these business lines are included in the CBL segment. Substantially all of the remaining assets and liabilities of Bridge are included in the Northern California segment. As the Bridge acquisition was completed on June 30, 2015, the results of operations of Bridge are included in the Company's Consolidated Income Statements beginning on July 1, 2015. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly.

The Arizona, Nevada, Southern California, and Northern California segments provide full service banking and related services to their respective markets although operations may not be domiciled in these states. The Company's CBL segment provides banking services to niche markets and, as of June 30, 2015, includes the operations of Bridge. These CBLs are managed centrally and are broader in geographic scope, though still predominately within the Company's core market areas. The Corporate & Other segment primarily relates to our Treasury division and also includes other corporate-related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 12% during the year, with a funds credit provided for the use of this equity as a funding source. Any excess or deficient equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average life of the assets or liabilities in the portfolio.

Net income amounts for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances, and average deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

On December 31, 2013, the Company consolidated its three bank subsidiaries under one charter, WAB. As a result, the Company redefined its operating segments to reflect the new organizational and internal reporting structure. The realignment of the Company's segments resulted in significant differences from the old segmentation methodology. Consequently, the Company determined that recasting prior year segment information to conform to the new segmentation methodology would be impracticable due to the substantial time and cost that would be involved in recasting this information. Also, given the incomparability of the reporting segments between periods, the Company determined that disclosure of the reportable segment information for the year ended December 31, 2014, as previously reported under the old basis, would not be beneficial to the reader as it does not assist the reader in better understanding the Company’s performance, assessing its prospects for future net cash flows or making more informed judgments about the Company as a whole, which are the primary objectives of ASC 280-10.

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The following is a summary of selected operating segment information for the years ended December 31, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	9.5		$	2.4		$	2.4		$	—		$	2,250.3		$	2,266.9
Loans, net of deferred loan fees and costs	2,811.7			1,737.2			1,761.9			1,188.4			3,597.9			39.6			11,136.7
Less: allowance for credit losses	(30.1		)	(18.6		)	(18.8		)	(12.7		)	(38.5		)	(0.4		)	(119.1		)
Total loans	2,781.6			1,718.6			1,743.1			1,175.7			3,559.4			39.2			11,017.6
Other assets acquired through foreclosure, net	8.4			20.8			—			0.3			—			14.4			43.9
Goodwill and other intangible assets, net	—			24.8			—			158.2			122.4			—			305.4
Other assets	43.9			62.3			15.7			16.1			28.4			474.9			641.3
Total assets	$	2,836.2		$	1,836.0		$	1,761.2		$	1,352.7		$	3,710.2		$	2,778.8		$	14,275.1
Liabilities:
Deposits	$	2,880.7		$	3,382.8		$	1,902.5		$	1,541.1		$	2,134.4		$	189.1		$	12,030.6
Borrowings and qualifying debt	—			—			—			—			—			360.3			360.3
Other liabilities	12.2			29.0			7.8			11.2			105.1			127.4			292.7
Total liabilities	2,892.9			3,411.8			1,910.3			1,552.3			2,239.5			676.8			12,683.6
Allocated equity:	309.2			244.4			191.3			293.2			428.6			124.8			1,591.5
Total liabilities and stockholders' equity	$	3,202.1		$	3,656.2		$	2,101.6		$	1,845.5		$	2,668.1		$	801.6		$	14,275.1
Excess funds provided (used)	365.9			1,820.2			340.4			492.8			(1,042.1		)	(1,977.2		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Borrowings and qualifying debt	—			—			—			—			—			430.7			430.7
Other liabilities	17.4			40.8			8.9			0.2			72.4			98.2			237.9
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

153

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2015:	(in thousands)
Net interest income (expense)	$	129,914		$	122,082		$	94,585		$	56,698		$	124,222		$	(34,925	)	$	492,576
Provision for (recovery of) credit losses	3,099			(6,887		)	152			3,038			3,917			(119		)	3,200
Net interest income (expense) after provision for credit losses	126,815			128,969			94,433			53,660			120,305			(34,806		)	489,376
Non-interest income	4,204			9,202			2,697			5,161			4,110			4,394			29,768
Non-interest expense	(59,917		)	(59,553		)	(47,549		)	(30,161		)	(45,831		)	(17,595		)	(260,606		)
Income (loss) from continuing operations before income taxes	71,102			78,618			49,581			28,660			78,584			(48,007		)	258,538
Income tax expense (benefit)	27,893			27,516			20,849			12,051			29,469			(53,484		)	64,294
Net income	$	43,209		$	51,102		$	28,732		$	16,609		$	49,115		$	5,477		$	194,244

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2014:	(in thousands)
Net interest income (expense)	$	112,128		$	117,508		$	91,090		$	9,133		$	71,010		$	(15,976	)	$	384,893
Provision for (recovery of) credit losses	2,083			(7,542		)	(1,638		)	—			11,365			458			4,726
Net interest income (expense) after provision for credit losses	110,045			125,050			92,728			9,133			59,645			(16,434		)	380,167
Non-interest income	3,586			8,944			3,917			184			1,742			6,278			24,651
Non-interest expense	(54,859		)	(59,683		)	(49,764		)	(3,857		)	(27,804		)	(11,352		)	(207,319		)
Income (loss) from continuing operations before income taxes	58,772			74,311			46,881			5,460			33,583			(21,508		)	197,499
Income tax expense (benefit)	23,053			26,009			19,711			2,296			12,594			(35,273		)	48,390
Income from continuing operations	35,719			48,302			27,170			3,164			20,989			13,765			149,109
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	35,719		$	48,302		$	27,170		$	3,164		$	20,989		$	12,607		$	147,951

154

23. QUARTERLY FINANCIAL DATA (UNAUDITED)

	Year Ended December 31, 2015
	Fourth Quarter			Third Quarter (1)			Second Quarter (1)			First Quarter (1)
	(in thousands, except share amounts)
Interest income	$	151,331		$	146,233		$	116,618		$	110,962
Interest expense	7,988			8,826			7,900			7,854
Net interest income	143,343			137,407			108,718			103,108
Provision for credit losses	2,500			—			—			700
Net interest income after provision for credit losses	140,843			137,407			108,718			102,408
Non-interest income	9,479			8,502			5,545			6,242
Non-interest expense	(72,448		)	(72,916		)	(61,209		)	(54,033		)
Income from continuing operations before provision for income taxes	77,874			72,993			53,054			54,617
Income tax expense	19,348			17,133			13,579			14,234
Net income	58,526			55,860			39,475			40,383
Dividends on preferred stock	151			176			247			176
Net income available to common stockholders	$	58,375		$	55,684		$	39,228		$	40,207
Earnings per share:
Basic	$	0.58		$	0.55		$	0.44		$	0.46
Diluted	$	0.57		$	0.55		$	0.44		$	0.45

(1) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, prior period 2015 amounts have been adjusted.

	Year Ended December 31, 2014
	Fourth Quarter			Third Quarter			Second Quarter			First Quarter
	(in thousands, except per share amounts)
Interest income	$	110,151		$	105,554		$	101,973		$	98,701
Interest expense	8,006			7,481			8,075			7,924
Net interest income	102,145			98,073			93,898			90,777
Provision for credit losses	300			419			507			3,500
Net interest income after provision for credit losses	101,845			97,654			93,391			87,277
Non-interest income	8,417			6,073			5,599			4,562
Non-interest expense	(55,742		)	(49,859		)	(52,242		)	(49,476		)
Income from continuing operations before provision for income taxes	54,520			53,868			46,748			42,363
Income tax expense	14,111			12,949			10,706			10,624
Income from continuing operations	40,409			40,919			36,042			31,739
Loss from discontinued operations, net of tax	—			—			(504		)	(654		)
Net income	40,409			40,919			35,538			31,085
Dividends on preferred stock	329			353			352			353
Net income available to common stockholders	$	40,080		$	40,566		$	35,186		$	30,732
Earnings per share:
Basic	$	0.46		$	0.47		$	0.41		$	0.35
Diluted	$	0.46		$	0.46		$	0.40		$	0.35

155

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures.

As of the end of the period covered by this Annual Report on Form 10-K, an evaluation was carried out by the Company’s management, with the participation of its CEO and CFO, of the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e), under the Exchange Act. Based upon that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective as of the end of the period covered by this report. No changes were made to the Company’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the last fiscal quarter that materially affected, or are reasonably likely to affect, the Company’s internal control over financial reporting.

MANAGEMENTS REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of WAL is responsible for establishing and maintaining adequate internal control over financial reporting. The Company’s internal control over financial reporting is a process designed under the supervision of the Company’s CEO and CFO to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Company’s financial statements for external purposes in accordance with U.S. generally accepted accounting principles.

As of December 31, 2015, management assessed the effectiveness of the Company’s internal control over financial reporting based on the criteria for effective internal control over financial reporting established in “Internal Control-Integrated Framework” issued by the COSO in 2013. Based on this assessment, management determined that the Company maintained effective internal control over financial reporting as of December 31, 2015, based on those criteria.

RSM US LLP, the independent registered public accounting firm that audited the Consolidated Financial Statements of the Company included in this Annual Report on Form 10-K has audited the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. Their report, which expresses an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015, is included herein.

156

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders

Western Alliance Bancorporation

We have audited Western Alliance Bancorporation’s (the Company) internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013. Western Alliance Bancorporation’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (a) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (b) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (c) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Western Alliance Bancorporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Consolidated Financial Statements of Western Alliance Bancorporation and our report dated February 16, 2016 expressed an unqualified opinion.

/s/ RSM US LLP

Phoenix, Arizona

February 16, 2016

157

Item 9B. Other Information

Not applicable.

158

PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information required by this item is incorporated by reference from the Company’s Definitive Proxy Statement for the 2016 Annual Meeting of Stockholders to be held on May 17, 2016.

The Company has adopted a Code of Business Conduct and Ethics applicable to all of our directors and employees, including the principal executive officer, principal financial officer and principal accounting officer. A copy of the Code of Business Conduct and Ethics is available on the Company’s website at www.westernalliancebancorp.com.

Item 11. Executive Compensation

The information required by this item is incorporated by reference from the Company’s Definitive Proxy Statement for the 2016 Annual Meeting of Stockholders to be held on May 17, 2016.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this item is incorporated by reference from the Company’s Definitive Proxy Statement for the 2016 Annual Meeting of Stockholders to be held on May 17, 2016.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this item is incorporated by reference from the Company’s Definitive Proxy Statement for the 2016 Annual Meeting of Stockholders to be held on May 17, 2016.

Item 14. Principal Accountant Fees and Services

The information required by this item is incorporated by reference from the Company’s Definitive Proxy Statement for the 2016 Annual Meeting of Stockholders to be held on May 17, 2016.

PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(1) The following financial statements are incorporated by reference from Item 8 hereto:

Report of Independent Registered Public Accounting Firm	83
Consolidated Balance Sheets as of December 31, 2015 and 2014	84
Consolidated Income Statements for the three years ended December 2015, 2014, and 2013	85
Consolidated Statements of Comprehensive Income for the three years ended December 31, 2015, 2014, and 2013	87
Consolidated Statements of Stockholders’ Equity for the three years ended December 31, 2015, 2014, and 2013	88
Consolidated Statements of Cash Flows for the three years ended December 31, 2015, 2014, and 2013	89
Notes to Consolidated Financial Statements	91

(2) Financial Statement Schedules

Not applicable.

On the Exhibit Index, a “±” identifies each management contract or compensatory plan or arrangement required to be filed as an exhibit to this Annual Report.

159

EXHIBITS

2.1	Agreement and Plan of Merger, dated as of August 17, 2012, by and between Western Alliance Bancorporation ("Western Alliance") and Western Liberty Bancorp (incorporated by reference to Exhibit 2.1 to Western Alliance’s Form 8-K filed with the SEC on August 22, 2012).
2.2	Agreement and Plan of Merger, dated as of January 18, 2013, by and among Western Alliance Bank, LandAmerica Financial Group, Inc., Orange County Bancorp and Centennial Bank (incorporated by reference to Exhibit 2.1 of Western Alliance’s Form 8-K filed with the SEC on January 22, 2013).
2.3	Plan of Conversion, dated May 29, 2014 (incorporated by reference to Exhibit 2.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
2.4	Agreement and Plan of Merger, dated as of March 9, 2015, by and between Western Alliance and Bridge Capital Holdings (incorporated by reference to Exhibit 2.1 of Western Alliance’s Form 8-K filed with the SEC on March 13, 2015).
2.5	Letter of Agreement, effective as of June 22, 2015 (incorporated by reference to Exhibit 2.1 of Western Alliance's Form 8-K filed with the SEC on June 22, 2015).
3.1	Articles of Conversion, as filed with the Nevada Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.2	Certificate of Conversion, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.2 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.3	Certificate of Incorporation, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.3 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.4	Certificate of Designation of Non-Cumulative Perpetual Preferred Stock, Series B, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.4 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.5	Certificate of Amendment of Certificate of Incorporation of Western Alliance, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 8-K filed with the SEC on May 22, 2015).
3.6	Amended and Restated Bylaws of Western Alliance, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.2 of Western Alliance's Form 8-K filed with the SEC on May 22, 2015).
4.1	Form of Common Stock Certificate (incorporated by reference to Exhibit 4.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
4.2	Senior Debt Indenture, dated August 25, 2010, between Western Alliance and Wells Fargo Bank, National Association, as trustee. (incorporated by reference to Exhibit 4.1 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.3	First Supplemental Indenture, dated August 25, 2010, between Western Alliance and Wells Fargo Bank, National Association, as trustee. (incorporated by reference to Exhibit 4.2 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.4	Form of 10.00% Senior Notes due 2015 (incorporated by reference to Exhibit 4.3 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.5	Form of Non-Cumulative Perpetual Preferred Stock, Series B, stock certificate (incorporated by reference to Exhibit 4.8 of Western Alliance’s Annual Report on form 10-K filed with the SEC on March 2, 2012).
4.6	Form of Senior Debt Indenture (incorporated by reference to Exhibit 4.2 of Western Alliance's Form S-3 filed with the SEC on May 7, 2015).
4.7	Form of Subordinated Debt Indenture (incorporated by reference to Exhibit 4.3 of Western Alliance's Form S-3 filed with the SEC on May 7, 2015).
4.8	Form of 5.00% Fixed to Floating Rate Subordinated Bank Note due July 15, 2025 (incorporated by reference to Exhibit 4.1 of Western Alliance's Form 8-K filed with the SEC on July 2, 2015).
10.1	Western Alliance 2005 Stock Incentive Plan, as amended (incorporated by reference to Appendix G of the Registrant's definitive Proxy Statement on Schedule 14A filed with the Commission on April 2, 2014). ±
10.2	Bridge Capital Holdings 2006 Equity Incentive Plan (incorporated by reference to Exhibit 4.11 of Western Alliance's Form S-8 filed with the SEC on July 2, 2015). ±
10.3	Form of BankWest Nevada Corporation Incentive Stock Option Plan Agreement (incorporated by reference to Exhibit 10.3 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±

160

10.4	Form of Western Alliance Incentive Stock Option Plan Agreement (incorporated by reference to Exhibit 10.4 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±
10.5	Form of Western Alliance 2002 Stock Option Plan Agreement (incorporated by reference to Exhibit 10.5 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±
10.6	Form of Western Alliance 2002 Stock Option Plan Agreement (with double trigger acceleration clause) (incorporated by reference to Exhibit 10.6 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±
10.7	Form of Indemnification Agreement (incorporated by reference to Exhibit 10.7 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±
10.8	Form of Non-Competition Agreement (incorporated by reference to Exhibit 10.8 of Western Alliance’s Registration Statement on Form S-1 filed with the SEC on April 28, 2005). ±
10.9	Securities Purchase Agreement, dated September 29, 2008, by and among Western Alliance and certain other parties thereto (incorporated by reference to Exhibit 10.1 of Western Alliance’s Form 8-K filed with the SEC on October 2, 2008).
10.10	Registration Rights Agreement, dated September 29, 2008, by and among Western Alliance and certain other parties thereto (incorporated by reference to Exhibit 10.2 of Western Alliance’s Form 8-K filed with the SEC on October 2, 2008).
10.11	Letter Agreement, dated November 21, 2008, between Western Alliance and the United States Department of the Treasury, and the Securities Purchase Agreement – Standard Terms attached thereto (incorporated by reference to Exhibit 10.1 of Western Alliance’s Form 8-K filed with the SEC on November 25, 2008).
10.12	Western Alliance 2013 Annual Bonus Plan (incorporated by reference to Exhibit 10.21 of Western Alliance's Form 10-K filed with the SEC on March 1, 2013). ±
10.13	Western Alliance 2014 Annual Bonus Plan (incorporated by reference to Exhibit 10.12 of Western Alliance’s Form 10-K filed with the SEC on February 21, 2014). ±
10.14	Western Alliance 2015 Annual Bonus Plan (incorporated by reference to Exhibit 10.13 of Western Alliance's Form 10-K filed with the SEC on February 17, 2015). ±
10.15*	Western Alliance 2016 Annual Bonus Plan. ±
10.16	Small Business Lending Fund – Securities Purchase Agreement, dated September 27, 2011, between Western Alliance and the Secretary of the Treasury (incorporated by reference to Exhibit 10.1 of Western Alliance’s Form 8-K filed with the SEC on September 27, 2011).
10.17	Repurchase Agreement, dated September 27, 2011, between Western Alliance and the United States Department of the Treasury (incorporated by reference to Exhibit 10.2 of Western Alliance’s Form 8-K filed with the SEC on September 27, 2011).
10.18	Western Alliance Change in Control Severance Plan (incorporated by reference to Exhibit 10.1 of Western Alliance’s Form 8-K filed with the SEC on September 25, 2012). ±
10.19	Amended and Restated Distribution Agency Agreement, dated October 30, 2014, by and between Western Alliance and Credit Suisse Securities (USA) LLC (incorporated by reference to Exhibit 10.1 of Western Alliance's Form 10-Q filed with the SEC on October 30, 2014).
10.20*	Amendment No. 1 to the Amended and Restated Distribution Agency Agreement, dated October 30, 2015, by and between Western Alliance and Credit Suisse (USA) LLC.
21.1*	List of Subsidiaries of Western Alliance.
23.1*	Consent of RSM US LLP.
24.1*	Power of Attorney (see signature page).
31.1*	CEO Certification Pursuant Rule 13a-14(a)/15d-14(a).
31.2*	CFO Certification Pursuant Rule 13a-14(a)/15d-14(a).
32**	CEO and CFO Certification Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes Oxley Act of 2002.
101.INS*	XBRL Instance Document.
101.SCH*	XBRL Taxonomy Extension Schema Document.
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document.

161

101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document.

* Filed herewith.

** Furnished herewith.

± Management contract or compensatory arrangement.

Stockholders may obtain copies of exhibits by writing to: Dale Gibbons, Western Alliance Bancorporation, One East Washington Street Suite 1400, Phoenix, AZ 85004.

162

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	WESTERN ALLIANCE BANCORPORATION
February 16, 2016	By:	/s/ Robert Sarver
		Robert Sarver
		Chairman of the Board and
		Chief Executive Officer

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Robert Sarver and Dale Gibbons, and each of them, his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto and other documents in connection therewith the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as he or she might or could do in person hereby ratifying and confirming all that said attorneys-in-fact and agents, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant in their listed capacities on February 16, 2016.

163

Name	Title
/s/ Robert Sarver	Chairman of the Board and Chief Executive Officer
Robert Sarver	(Principal Executive Officer)
/s/ Dale Gibbons	Executive Vice President and Chief Financial
Dale Gibbons	Officer (Principal Financial Officer)
/s/ J. Kelly Ardrey Jr.	Senior Vice President and Chief Accounting Officer
J. Kelly Ardrey Jr.	(Principal Accounting Officer)
/s/ Bruce D. Beach	Director
Bruce D. Beach
/s/ William S. Boyd	Director
William S. Boyd
/s/ Howard Gould	Director
Howard Gould
/s/ Steven J. Hilton	Director
Steven J. Hilton
/s/ Robert Latta	Director
Robert Latta
/s/ Marianne Boyd Johnson	Director
Marianne Boyd Johnson
/s/ Cary Mack	Director
Cary Mack
/s/ Todd Marshall	Director
Todd Marshall
/s/ M. Nafees Nagy	Director
M. Nafees Nagy
/s/ James Nave	Director
James Nave
/s/ John Peter Sande III	Director
John Peter Sande III
/s/ Donald D. Snyder	Director
Donald D. Snyder
/s/ Sung Won Sohn	Director
Sung Won Sohn
/s/ Kenneth A. Vecchione	Director
Kenneth A. Vecchione

164

EX-10.15

Exhibit 10.15

Western Alliance Bancorporation

OBJECTIVE: Western Alliance Bancorporation (“WAL”) has established the 2005 Stock Incentive Plan (“SIP”), which is hereby incorporated by reference. To further the objectives of the SIP, WAL has established the WAL 2016 Annual Bonus Plan (“Bonus Plan”) under the SIP, effective January 1, 2016. The purpose of the Bonus Plan is to provide incentives and rewards for superior performance in order to attract and retain highly qualified team members and to maximize financial performance during the 2016 calendar year (“Plan Year”) so that Western Alliance Bancorporation (“WAL”) will meet and exceed its performance goals.

ELIGIBILITY: Employees of Western Alliance Bank or another wholly-owned affiliate of WAL as of January 1^st of the Plan Year are eligible for the Bonus Plan, unless the employee is eligible to participate in a special incentive plan, e.g., Alliance Association Bank, or a separate individual plan (“Participants”). Employees hired between January 1, 2016and September 30, 2016 are eligible for a prorated award under the Bonus Plan. Employees hired after September 30^th are not eligible for the Bonus Plan, but may become eligible for the following year’s annual bonus plan.

EFFECTIVE DATE: January 1, 2016. This Bonus Plan supersedes all prior annual bonus plans adopted by WAL.

FREQUENCY OF AWARDS:Awards will be paid within 90 days after the end of the Plan Year. Participants must be employed at the end of the Plan Year to receive any compensation under this Bonus Plan.

PLAN ADMINISTRATOR: Pursuant to Section 3 of the SIP, the WAL Compensation Committee will approve, administer and implement the Bonus Plan. The day to day details of the Bonus Plan will be monitored by an internal committee made up of WAL Chief Executive Officer, Chief Financial Officer, and Chief Administrative Officer (“Bonus Plan Committee”).

HOW THE PLAN WORKS: Subject to the terms of the Bonus Plan, award calculations will be based on the following performance measures: 1) Earnings per Share, 2) Credit Quality, 3)Non-Interest Bearing Demand Deposit Growth, 4) Loan Growth, 5) Quality Control and 6) Fee Revenue (“Plan Performance Measures”).

Each Plan Performance Measure will operate independently (i.e., it is possible for one Performance Measure to generate an award opportunity and not another); likewise, it is possible for one Performance Measure to be achieved at a higher level than another. Performance Measures are individually weighted (“Performance Measure Weights”) (i.e., certain Performance Measures are counted more heavily in calculating awards than others). The Bonus Plan Committee recommends the Plan Performance Measures and Performance Measure Weights at the beginning of the Plan Year for approval by the WAL Compensation Committee. The Compensation Committee retains absolute authority over the selection of and Performance Measures and Performance Measure Weights.

A target bonus percentage expressed as a percentage of base salary will be established for each Participant. A payout at the maximum level requires outstanding performance for the year in all components of the Bonus Plan. Base Salary is defined as the Participant’s actual salary earned for the year which includes pay for regular hours worked plus paid holiday, sick, and vacation hours; earnings received during a leave of absence are not included in this calculation.

A. Earnings Per Share Performance is weighted 35%

This portion of the award will be calculated based on WAL’s Earnings per Share performance during the Plan Year. The Earnings per Share calculation is determined pursuant to Generally Accepted Accounting Principles (“GAAP”). EPS will be adjusted for gain/loss on trust preferred valuation, merger charges, mandated legal/regulatory changes.

WAL Performance Earnings Per Share Results	Performance Measure Weight Paid (%)
Less than < $2.20	No Bonus paid
Between $2.20 to $2.30	75% to 100%
Between $2.30 to $2.50	100% to 150%

1

B. Credit Quality is weighted 20%

This Credit Quality portion of the award will be calculated using the Net Charge Off ratio (10%) and the ratio of Classified Assets to Total Assets (10%).

a. The Net Charge Off ratio equals Net Loan Charge Offs for the year divided by Average Loans Outstanding for the year.

WAL Credit Quality Performance	Performance Measure Weight Paid (%)
Net Charge Off Ratio
>.25%	No Bonus Paid
<.25% to .20 %	75% to 100%
<.20% to .15%	100% to 150%

b. The ratio of Classified Assets to Total Assets will be measured [as of December 31, 2016].

WAL Credit Quality Performance	Performance Measure Weight Paid (%)
Classified Assets to Total Assets Ratio
>2.10%	No Bonus Paid
<2.10% to 1.70%	75% to 100%
<1.70% to 1.30%	100% to 150%

C. Non-Interest Bearing Non-Credit Enhanced Demand Deposit Growth is weighted 15%

1. This portion of the award will be calculated using the actual Non-Interest Bearing Non-Credit Enhanced Demand Deposit Growth results for Western Alliance Bank. Exclusions may be made to these calculations to account for windfalls.

2. Following are the definitions/calculations on which this portion of the award will be based:

a. A calculation will be made based on the year over year Western Alliance Bank growth in organic Non-Interest Bearing Non-Credit Enhanced Demand Deposit Accounts (15% of target).

b. The calculation will exclude accounts with credit enhancements, such as letters of credit, collateralized deposits and reciprocal deposit arrangements. Growth will not include increases in non-interest bearing demand deposits acquired by acquisition.

c. Calculation: The percent of Target award paid for year over year Non-Interest Bearing Non-Credit Enhanced Demand Deposit Growth will be calculated based on the following schedule:

Non-Interest Bearing Non-Credit Enhanced Demand Deposit Growth	Percent of Performance Measure Weight Paid
Less than <$650MM growth	No Bonus paid
Between $650 - $900MM	75% to 100%
Between $900 - $1,250MM	100% to 150%

D. Loan Growth is weighted 10%

1. This portion of the award will be calculated based on actual Loan Growth results for WAL. Exclusions may be made to these calculations to account for windfalls.

2. Following are the definitions/calculations on which this portion of the award will be based:

a. A calculation will be made based on the year over year growth in Total Loans (10% of target).

b. Loan calculations will not include increases in loans acquired by acquisition.

2

c. Calculation: The percent of Target award paid for year over year Loan Growth will be calculated based on the following schedule:

Loan Growth	Performance Measure Weight Paid (%)
Less than <$650 MM	No Bonus paid
Between $650 - $900 MM	75% to 100%
Between $900 - $1,250 MM	100% to 150%

E. Quality Control is weighted 10%

1. The effectiveness of the Company’s quality control will be evaluated based upon regulatory examinations and internal audits.

2. Effective internal audits will include preparedness, execution, and compliance with the regulatory framework for banks over $10 billion in assets, as well as meeting the bank’s CRA goals.

3. The maximum pay out for the quality control portion of the award is 100%

4. Quality Control performance will be measured and assessed by the WAL Audit Committee

F. Organic Fee Revenue is weighted 10%

1. This portion of the award will be calculated using the actual Fee Revenue results for Western Alliance Bank.

2. Following are the definitions/calculations on which this portion of the award will be based:

a. A calculation will be made for Western Alliance Bank Non-Interest Fee Income and will exclude the following revenue: BOLI, rental income, lease income and appraisal income.

b. Calculation: The percent of Target bonus paid for Fee Revenue will be calculated based on the following schedule:

Fee Revenue	Performance Measure Weight Paid (%)
Less than <$31.5MM	No Bonus paid
Between $31.5 - $33.0 MM	75% to 100%
Between $33.0 - $34.5 million	100% to 150%

G. Other Calculation Provisions

1. Members of the WAL Executive Management Committee, Divisional Presidents and all Participants below the level of Vice President will be paid out according to the bonus formula without respect to individual assessments. Participants with a corporate title of Vice President, Senior Vice President and Executive Vice President will be evaluated at the end of the Plan Year. Such Participants’ final awards will range from 75% to 120% of each Participant’s target payout based on participant’s contribution to overall performance.

2. Each Participant must meet individual loan and deposit production goals, if applicable, or their award may be reduced or eliminated.

3. A Participant’s bonus may be reduced or eliminated if, in the discretion of the Bonus Plan Committee: i) their department’s loan review and/or audits are rated below satisfactory and/or not adhering to safety, soundness, and approved operational procedures; ii) any Participant, their branch or department earns a rating of less than “Satisfactory,”; iii) their department’s credit underwriting and/or portfolio management practices are rated below “Satisfactory” and/or not adhering to safety and soundness; or iv) the Participant, their branch or department has not contributed adequately to the financial results attributed to them.

H. Other Administrative Provisions

1. This is a discretionary bonus plan and, in order to receive payment of any award under this Plan, the Participant must be eligible and employed by Western Alliance Bank or another wholly-owned affiliate of WAL at the end of the Plan Year.

3

2. Designation as a Participant in the Bonus Plan does not create a contract of employment for any specified time, nor does it alter or amend an “at-will” policy of employment.

3. If any Participant’s performance is rated as falling below job expectations or as less than satisfactory at any time during the Plan Year, or if the participant is subject to any written disciplinary action, the award will be reduced or eliminated.

4. If any Participant whose job duties include development of new loans and deposits does not meet or exceed that Participant’s production goals, the award may be significantly reduced.

5. A change in officer title during the Plan Year will result in a prorated change in target bonus percentage based upon the number of months in each position.

6. Awards will be paid through the normal payroll process to Participants. All awards will be subject to applicable taxes. Awards do not constitute commissions or additional wages, and participants have no vested interests in the benefits of the Bonus Plan, except as expressly provided for herein. No right or interest of any participant in the Bonus Plan is assignable or transferable.

7. Awards under this Bonus Plan will be used in calculating covered earnings for benefit purposes for the 401(k) and Life Insurance Plans but not for Long Term Disability Insurance.

8. Timely and accurate completion of all reports, budgets and other planning exercises is required for payment under the Bonus Plan.

9. Acknowledgment from the HR Department that departments and officers have conformed to bank policy in timeliness of annual reviews, controllable turnover, and all other areas of HR administration is required for payment under this Bonus Plan.

10. Performance measurements and statistics will be based on calculations completed by the Finance Division of Western Alliance Bank. Any questions about the results or the bonus calculations must be submitted to the Plan Administrator within 30 days after the calculations have been completed and published, after which time no inquiries will be considered.

11. Performance Measures, Performance Measure Weights and award opportunities may be adjusted during the performance period only upon approval by the Plan Administrator as it deems appropriate. It is anticipated that such adjustments will be made infrequently and only in extraordinary circumstances. Notwithstanding the foregoing, no adjustment will be made to any award intended to qualify as “performance-based compensation” for purposes of Code Section 162(m) (as defined below) to the extent the adjustment would cause the award to fail to so qualify.

12. This Bonus Plan is governed and interpreted by the Plan Administrator, whose decisions shall be final. WAL reserves the right to change, amend, modify, suspend, continue or terminate all or any part of the Plan either in an individual case or in general, at any time without notice and without consent of any Participant.

13. Participants in special incentive plans (which may be paid out quarterly) may not be eligible to participate in the Bonus Plan, and the Bonus Plan Committee has the discretion to determine eligibility for the Bonus Plan.

14. The intent of the Bonus Plan is to fairly reward employees for adding value to WAL. Subject to the Code Section 162(m) provisions below, if adjustments need to be made to allow the Bonus Plan to accomplish its purpose, the Plan Administrator in its sole discretion can make those adjustments.

15. Notwithstanding anything to the contrary in this Plan, it is the intention of the Plan Administrator that any award granted to a participant who is a “covered employee” (each a “Covered Employee”) as defined in Section 162(m) of the Internal Revenue Code of 1986, as amended (the “Code”), should qualify as “performance-based compensation” for purposes of Code Section 162(m), all determinations relating to such awards will be made by the WAL Compensation Committee, which is comprised solely of “outside directors” (within the meaning of Code Section 162(m)), and the following provisions will apply to such awards:

a. The WAL Compensation Committee will determine the amount of an award opportunity to be granted to each participant who is a Covered Employee.

4

b. Subject to subsection (e) below, the amount of a Covered Employee’s award will be an amount determinable from written performance targets approved by the WAL Compensation Committee while the outcome is substantially uncertain and no more than 90 days after the commencement of the performance period to which the performance target relates. The WAL Compensation Committee will have the authority to determine in its sole discretion the applicable performance period relating to any such award.

c. The maximum aggregate limit on awards that may be awarded under this plan to any Covered Employee with respect to any calendar year is $5 million.

d. The amount of any award will be based on objective Performance Measures and a Performance Target with respect to each Performance Measure as specified by the WAL Compensation Committee. When establishing performance targets that are intended to qualify as “performance-based compensation” for purposes of Code Section 162(m), the WAL Compensation Committee may exclude any or all “extraordinary items” as determined under GAAP including, without limitation, the charges or costs associated with restructurings of the Company, discontinued operations, other unusual or non-recurring items, and the cumulative effects of accounting changes, only to the extent permitted under Code Section 162(m).

e. The WAL Compensation Committee will determine in writing with respect to any Covered Employee whether the performance target has been met with respect to any affected Covered Employee and, if that is the case, so certify and ascertain the amount of the applicable award. No awards will be paid to any Covered Employee until such certification is made by the WAL Compensation Committee.

f. The Plan will be administered and interpreted in accordance with Code Section 162(m) to ensure the deductibility by the Company or its affiliates of the payment of such awards.

16. To the extent not preempted by federal law, the Bonus Plan shall be construed in accordance with and governed by the State of Arizona, determined without regard to its conflict of law principles. If any provision of this Bonus Plan shall be held by a court of competent jurisdiction to be invalid or unenforceable, the remaining provisions hereof shall continue to be full effective. The jurisdiction and venue for any disputes arising under, or any action brought to enforce (or otherwise relating to) this Bonus Plan shall be exclusively in the courts of the State of Arizona, County of Maricopa, including the Federal Courts located there (should Federal jurisdiction exist).

5

Sample Calculation:

1. Earnings Per Share Performance is weighted 35%

EPS achieved	$2.30
% of EPS Target Paid	100%

2. Credit Quality Performance is weighted 20%

Net Charge Off Ratio	.20%
Classified Assets to Total Assets	1.70%
% of Credit Quality Target Paid	100%

3. Non-Interest Bearing Non-Credit Enhanced Demand Deposit Growth is weighted 15%

Non-Interest Demand Deposit Growth Achieved	$1,250MM
% of Loan Non-Interest Bearing Demand Deposit Growth Target Paid	150%

4. Loan Growth Performance is weighted 10%

Loan Growth Achieved	$1,250MM
% of Loan Growth Target Paid	150%

5. Quality Control factors are weighted 10%

Passed at the 100% level for example purposes

6. Fee Revenue is weighted 10%

Fee Revenue Achieved	$33.0MM
% of Fee Revenue Target Paid	100%

Example Paid under WAL Annual Bonus

Participant has a base salary of $60,000 Target Bonus of 8% Target Bonus - $4,800.00
EPS	Credit Quality	Non-Interest DDA Growth	Loan Growth	Quality Control	Fee Revenue
$4,800	$4,800	$4,800	$4,800	$4,800	$4,800
X 40%	X 10%	X 20%	X 10%	X 10%	X 10%
$1,920	$480	$960	$480	$480	$480
X 100%	X 100%	X150%	X150%	X100%	X100%
$1,920	$480	$1,440	$720	$480	480

Total Payout is $1,920 + $480 + $1,440 + $720 + $480 + 480= $5,520

6

EX-10.20

Exhibit 10.20

EXECUTION VERSION

AMENDMENT NO. 1

TO

AMENDED AND RESTATED DISTRIBUTION AGENCY AGREEMENT

This Amendment No. 1 (this “Amendment”) to the Amended and Restated Distribution Agency Agreement is made and entered into as of October 30, 2015 (the “Amendment Effective Date”), by and between Western Alliance Bancorporation, a Delaware corporation (the “Company”), and Credit Suisse Securities (USA) LLC (the “Manager”), in order to amend that certain Amended and Restated Distribution Agency Agreement (the “Agreement”), dated as of October 30, 2014, by and between the Company and the Manager. Capitalized terms used herein and not defined shall have the meanings set forth in the Agreement.

WHEREAS, the Company desires to file a final prospectus supplement, relating to the Shares, with the Commission pursuant to Rule 424(b) under the Act in the form furnished by the Company to the Manager in order to permit sales of the Shares under the Agreement;

WHEREAS, the Agreement references that certain registration statement on Form S-3 (File No. 333-181128), the effectiveness of which lapsed on May 14, 2015;

WHEREAS, the Company filed a new registration statement on Form S-3 (File No. 333- 203959) with the Commission on May 7, 2015, which became effective upon filing; and

WHEREAS, the Company and the Manager desire to amend the Agreement in order to reflect this change in the registration statement.

1. Amendments. The Agreement is hereby amended as follows:

(a) The first two clauses in Section 2(a) of the Agreement (ending with the second semi-colon) are hereby deleted in their entirety and replaced with the following:

A registration statement on Form S-3 (File No. 333-203959) (the “Initial Registration Statement”) in respect of the Shares has been filed with the Securities and Exchange Commission (the “Commission”); the Initial Registration Statement and any post-effective amendment thereto, each in the form heretofore delivered to you and, excluding exhibits to the Initial Registration Statement, but including all documents incorporated by reference in the prospectus included therein, became effective upon filing or have been declared effective by the Commission in such form (as the case may be);

(b) The following is hereby added as a new section immediately after Section 2(vv) of the Agreement:

(ww) (i) At the time the Registration Statement initially became effective, (ii) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the Act (whether by post-effective amendment, incorporated report or form of prospectus), (iii) at the time the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) under the Act) made any offer relating to the Shares in reliance on the exemption in Rule 163 under the Act, and (iv) on the effective date of Amendment No. 1 to this Agreement, the Company was or is (as the case may be) a “well-known seasoned issuer” as defined in Rule 405 under the Act (based on the relevant determination date under Rule 405).

(c)    The following is hereby added immediately after the last sentence in Section 4(a) of the Agreement:

If (1) the Registration Statement is not available for the sales of the Shares as contemplated by this Agreement or the Company is not a “well-known seasoned issuer” as defined in Rule 405 under the Act and (2) the Company files a new registration statement with respect to any additional Common Stock necessary to complete such sales of the Shares and causes such registration statement to become effective, then, after the

effectiveness of any such registration statement, all references to “Registration Statement” included in this Agreement shall be deemed to include such new registration statement, including all documents incorporated by reference therein pursuant to Item 12 of Form S-3, and all references to “Basic Prospectus” included in this Agreement shall be deemed to include the final form of prospectus, including all documents incorporated therein by reference, included in any such registration statement at the time such registration statement became effective.

2. Reference to and Effect on the Agreement. Except as specifically modified above, the Agreement shall remain in full force and effect.

3. Governing Law. This Amendment shall be governed by, and construed in accordance with, the laws of the State of New York. The Company hereby submits to the non-exclusive jurisdiction of the Federal and state courts in the Borough of Manhattan in The City of New York in any suit or proceeding arising out of or relating to this Amendment or the transactions contemplated hereby. The Company irrevocably and unconditionally waives any objection to the laying of venue of any suit or proceeding arising out of or relating to this Amendment or the transactions contemplated hereby in Federal and state courts in the Borough of Manhattan in The City of New York and irrevocably and unconditionally waives and agrees not to plead or claim in any such court that any such suit or proceeding in any such court has been brought in an inconvenient forum.

4. Execution in Counterparts. This Amendment may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Amendment.

512269.07-PALSR01A - MSW

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the Amendment Effective Date.

WESTERN ALLIANCE BANCORPORATION
By:	/s/ Dale Gibbons
	Name:	Dale Gibbons
	Title:	Executive Vice President and
		Chief Financial Officer

CREDIT SUISSE SECURITIES (USA) LLC
By:	/s/ Amit Grover
	Name:	Amit Grover
	Title:	Director

EX-21.1

Exhibit 21.1

WESTERN ALLIANCE BANCORPORATION

LIST OF SUBSIDIARIES

(As of December 31, 2015)

Name	Doing Business As	Jurisdiction of Incorporation or Organization
Western Alliance Bank	Alliance Bank of Arizona Bridge Bank First Independent Bank Bank of Nevada Torrey Pines Bank Alliance Association Bank Western Alliance Corporate Finance Western Alliance Public Finance Western Alliance Resort Finance Western Alliance Warehouse Lending	Arizona
Las Vegas Sunset Properties	Not applicable	Nevada
BankWest Nevada Capital Trust II	Not applicable	Delaware
Intermountain First Statutory Trust I	Not applicable	Connecticut
First Independent Statutory Trust I	Not applicable	Delaware
WAL Trust No. 1	Not applicable	Delaware
WAL Statutory Trust No. 2	Not applicable	Connecticut
WAL Statutory Trust No. 3	Not applicable	Connecticut
Bridge Capital Holdings Trust I	Not applicable	Delaware
Bridge Capital Holdings Trust II	Not applicable	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statements (Nos. 333-205437, 333-199727, 333-127032, 333-145548, 333-162107, and 333-183574) on Forms S-8 and Registration Statement (No. 333-203959) on Form S-3 of Western Alliance Bancorporation of our reports dated February 16, 2016 relating to our integrated audit of the consolidated financial statements and internal control over financial reporting which appear in this Annual Report on Form 10-K of Western Alliance Bancorporation for the year ended December 31, 2015.

/s/ RSM US LLP

Phoenix, Arizona

February 16, 2016

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Robert Sarver, certify that:

1. I have reviewed this Annual Report on Form 10-K of Western Alliance Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Robert Sarver
		Robert Sarver
		Chief Executive Officer
Date:	February 16, 2016	Western Alliance Bancorporation

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Dale Gibbons, certify that:

1. I have reviewed this Annual Report on Form 10-K of Western Alliance Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Dale Gibbons
		Dale Gibbons
		Chief Financial Officer
Date:	February 16, 2016	Western Alliance Bancorporation

EX-32

EXHIBIT 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

This certification is given by the undersigned Chief Executive Officer and Chief Financial Officer of Western Alliance Bancorporation (the “Registrant”) pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Each of the undersigned hereby certifies, with respect to the Registrant's annual report on Form 10-K for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), that, to each of their knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date:	February 16, 2016	/s/ Robert Sarver
		Chief Executive Officer
		Western Alliance Bancorporation
Date:	February 16, 2016	/s/ Dale Gibbons
		Chief Financial Officer
		Western Alliance Bancorporation

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Feb. 10, 2016	Jun. 30, 2015
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	WAL
Entity Registrant Name	WESTERN ALLIANCE BANCORPORATION
Entity Central Index Key	0001212545
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		103,418,400
Entity Public Float			$ 2,357.3

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks	$ 133,709	$ 125,329
Interest-bearing deposits in other financial institutions	90,931	39,067
Cash and cash equivalents	224,640	164,396
Money Market Funds, at Carrying Value	122	451
Investment securities - measured at fair value; amortized cost of $1,389 at December 31, 2015 and $1,734 at December 31, 2014	1,481	1,858
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	1,982,523	1,520,237
Investments in restricted stock, at cost	58,111	25,275
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	23,809	0
Loans:
Loans, net of deferred loan fees and costs	11,112,854	8,398,265
Less: Allowance for credit losses	(119,068)	(110,216)
Net loans held for investment	10,993,786	8,288,049
Premises and equipment, net	118,535	113,818
Other assets acquired through foreclosure, net	43,942	57,150
Bank owned life insurance	162,458	141,969
Goodwill	289,638	23,224
Other intangible assets, net	15,716	2,689
Deferred tax assets, net	86,352	62,686
Other assets	273,976	198,696
Total assets	14,275,089	10,600,498
Deposits:
Non-interest-bearing demand	4,093,976	2,288,048
Interest-bearing	7,936,648	6,642,995
Total deposits	12,030,624	8,931,043
Customer repurchase agreements	38,155	54,899
Other borrowings	150,000	390,263
Qualifying debt	210,328	40,437
Other liabilities	254,480	182,928
Total liabilities	$ 12,683,587	$ 9,599,570
Commitments and Contingencies
Stockholders’ equity:
Preferred stock - par value $0.0001 and liquidation value per share of $1,000; 20,000,000 authorized; zero shares issued and outstanding at December 31, 2015 and 70,500 at December 31, 2014	$ 0	$ 70,500
Common stock - par value $0.0001; 200,000,000 authorized; 103,087,044 shares issued and outstanding at December 31, 2015 and 88,691,249 at December 31, 2014	10	9
Additional paid in capital	1,306,594	828,327
Accumulated other comprehensive income	262,638	85,453
Retained earnings	22,260	16,639
Total stockholders’ equity	1,591,502	1,000,928
Total liabilities and stockholders’ equity	$ 14,275,089	$ 10,600,498

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized cost of investment securities available for sale	$ 1,899,580	$ 1,493,648
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, liquidation value	$ 1,000	$ 1,000
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred Stock, Shares Issued	70,500	141,000
Preferred stock, shares outstanding	70,500	141,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	103,087,044	88,691,249
Common stock, shares outstanding	103,087,044	88,691,249

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Loans, including fees	$ 476,417	$ 370,922	$ 326,714
Investment securities	37,888	38,603	30,382
Dividends	10,317	6,562	4,454
Other	522	292	1,105
Total interest income	525,144	416,379	362,655
Interest expense:
Deposits	21,795	20,012	16,335
Other borrowings	5,678	9,639	11,506
Qualifying debt	5,007	1,754	1,823
Other	88	81	96
Total interest expense	32,568	31,486	29,760
Net interest income	492,576	384,893	332,895
Provision for credit losses	3,200	4,726	13,220
Net interest income after provision for credit losses	489,376	380,167	319,675
Non-interest income:
Service charges and fees	14,639	10,567	10,123
Income from bank owned life insurance	3,899	4,508	4,809
Card income	3,679	3,310	2,626
Lending related fees	1,948	71	0
Gain (Loss) on Sale of Securities, Net	615	757	(1,195)
Gains (Losses) on Extinguishment of Debt	(81)	(502)	(1,387)
Gain (loss) on sales of investment securities, net	47	1,212	(6,483)
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	0	10,044
Other income	5,022	4,728	3,660
Total non-interest income	29,768	24,651	22,197
Non-interest expense:
Salaries and employee benefits	149,828	126,630	113,434
Occupancy	22,180	18,155	19,378
Legal, professional, and directors' fees	18,548	14,278	13,633
Data processing	14,776	10,057	8,589
Insurance	11,003	8,862	8,094
Marketing	4,377	4,423	4,198
Card expense	2,764	2,417	1,805
Marketing Expense	2,885	2,300	2,581
Intangible amortization	1,970	1,461	2,388
Intangible amortization	(2,070)	(5,350)	(2,387)
Acquisition / restructure expense	8,836	198	5,752
Other expense	25,509	23,888	18,751
Total non-interest expense	260,606	207,319	196,216
Income from continuing operations before provision for income taxes	258,538	197,499	145,656
Income tax expense	64,294	48,390	29,830
Income from continuing operations	194,244	149,109	115,826
(Loss) from discontinued operations, net of tax	0	(1,158)	(861)
Net income	194,244	147,951	114,965
Dividends on preferred stock	750	1,387	1,410
Net income available to common stockholders	$ 193,494	$ 146,564	$ 113,555
Earnings per share from continuing operations:
Basic	$ 2.05	$ 1.70	$ 1.34
Diluted	2.03	1.69	1.32
Loss per share from discontinued operations:
Basic	0.00	(0.01)	(0.01)
Diluted	0.00	(0.02)	(0.01)
Earnings per share available to common stockholders:
Basic	2.05	1.69	1.33
Diluted	$ 2.03	$ 1.67	$ 1.31
Weighted average number of common shares outstanding:
Basic	94,570	86,693	85,682
Diluted	95,219	87,506	86,541
Dividends declared per common share	$ 0.00	$ 0.00	$ 0.00

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 194,244	$ 147,951	$ 114,965
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976	0
Other comprehensive income (loss), net:
Unrealized (loss) gain on AFS securities, net of tax effect of $3,922, $(17,749), and $18,240, respectively	(6,117)	29,683	(30,503)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	0	0	(17)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	90	0	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Subordinated Debt	(4,276)	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	(4,276)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(6,523)	1,380	(5,900)
Realized (gain) loss on sale of AFS securities included in income, net of tax effect of $230, $283, and $(447), respectively	(385)	(474)	748
Net other comprehensive (loss) income	(10,688)	38,185	(29,772)
Comprehensive income	$ 183,556	$ 186,136	$ 85,193

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	$ 0	$ (5,367)
Unrealized gain on securities available-for-sale securities, tax	(3,922)	17,749
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(52)	0
Realized gain on sale of securities, tax	$ 230	$ 283

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)		Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated (Deficit) [Member]	Bridge Capital Holdings [Member]	[2]	Bridge Capital Holdings [Member] Common Stock [Member]		Bridge Capital Holdings [Member] Additional Paid in Capital [Member]	[2]
Beginning balance at Dec. 31, 2012		$ 759,421,000	$ 141,000,000	$ 9,000	$ 784,852,000	$ 8,226,000	$ (174,666,000)
Beginning balance, shares at Dec. 31, 2012			141,000	86,465,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		114,965,000					114,965,000
Exercise of stock options, shares				440,000
Exercise of stock options		4,595,000			4,595,000
Restricted stock grants, net, shares				281,000
Restricted stock grants, net		7,699,000			7,699,000
Dividends on preferred stock		(1,410,000)					(1,410,000)
Other comprehensive (loss) income, net		(29,772,000)				(29,772,000)
Ending balance at Dec. 31, 2013		855,498,000	$ 141,000,000	$ 9,000	797,146,000	(21,546,000)	(61,111,000)
Ending balance, shares at Dec. 31, 2013			141,000	87,186,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		147,951,000					147,951,000
Exercise of stock options, shares				625,000
Exercise of stock options		8,294,000			8,294,000
Restricted stock grants, net, shares				332,000
Restricted stock grants, net		9,141,000			9,141,000
Stock Issued During Period, Shares, New Issues				548,122
Stock Issued During Period, Value, New Issues		$ 13,746,000		$ 14,200,000.0	13,746,000
Stock Redeemed or Called During Period, Shares		(70,500)	(70,000)
Stock Redeemed or Called During Period, Value		$ (70,500,000)	$ (70,500,000)
Dividends on preferred stock		(1,387,000)					(1,387,000)
Other comprehensive (loss) income, net		38,185,000				38,185,000
Ending balance at Dec. 31, 2014		1,000,928,000	$ 70,500,000	$ 9,000	828,327,000	16,639,000	85,453,000
Ending balance, shares at Dec. 31, 2014			71,000	88,691,000
Adjusted balance at Dec. 31, 2014	[1]	1,000,928,000	$ 70,500,000	$ 9,000	828,327,000	32,948,000	69,144,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 194,244,000					194,244,000
Exercise of stock options, shares		182,000		182,000
Exercise of stock options		$ 1,935,000			1,935,000
Restricted stock grants, net, shares				457,000
Restricted stock grants, net		17,014,000			17,014,000
Stock Issued During Period, Shares, New Issues				760,000						12,997,000
Stock Issued During Period, Value, New Issues		$ 28,288,000			28,288,000			$ 431,031,000		$ 1,000	[2]	$ 431,030,000
Stock Redeemed or Called During Period, Shares		(70,500)	(71,000)
Stock Redeemed or Called During Period, Value		$ (70,500,000)	$ (70,500,000)
Dividends on preferred stock		(750,000)					(750,000)
Other comprehensive (loss) income, net		(10,688,000)				(10,688,000)
Ending balance at Dec. 31, 2015		$ 1,591,502,000	$ 0	$ 10,000	$ 1,306,594,000	$ 22,260,000	$ 262,638,000
Ending balance, shares at Dec. 31, 2015			0	103,087,000

[1] As adjusted, see "Note 10. Qualifying Debt" to the Consolidated Financial Statements describing the $16.3 million reclassification made between retained earnings and AOCI.

[2] Includes value of certain share-based awards replaced in connection with the acquisition.

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CONSOLIDATED STATEMENTS OF CASH FLOWS	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash flows from operating activities:
Net income	$ 194,244,000	$ 147,951,000	$ 114,965,000
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	3,200,000	4,726,000	13,220,000
Depreciation and amortization	8,466,000	6,166,000	6,859,000
Stock-based compensation	17,930,000	12,465,000	7,699,000
Excess tax benefit of stock-based compensation	(5,874,000)	(4,194,000)	(1,552,000)
Deferred income taxes	3,254,000	(7,182,000)	(13,717,000)
Amortization of net premiums for investment securities	9,775,000	8,035,000	9,727,000
Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitions of Loans	(17,144,000)	(17,014,000)	(10,917,000)
Accretion and Amortization Fair Market Value Adjustments Relating to Acquisitions of Other Assets and Liabilities	1,279,000	(552,000)	437,000
Income from bank owned life insurance	(3,899,000)	(4,508,000)	(4,809,000)
Unrealized losses on assets and liabilities measured at fair value, net	(47,000)	(1,212,000)	6,483,000
(Gains) / Losses on:
Sales of investment securities	(615,000)	(757,000)	1,195,000
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	0	(10,044,000)
Gains (Losses) on Extinguishment of Debt	81,000	502,000	1,387,000
Other assets acquired through foreclosure, net	(2,628,000)	(2,866,000)	(5,924,000)
Valuation adjustments of other repossessed assets, net	182,000	294,000	3,743,000
Sale of premises, equipment, and other assets, net	376,000	(2,778,000)	(206,000)
Changes in, net of acquisitions:
Other assets	(9,999,000)	9,242,000	33,185,000
Other liabilities	14,231,000	14,971,000	13,318,000
Net cash provided by operating activities	212,812,000	163,289,000	165,049,000
Investment securities - measured at fair value
Principal pay downs and maturities	347,000	1,144,000	1,881,000
Investment securities - AFS
Purchases	(827,002,000)	(143,052,000)	(729,768,000)
Principal pay downs and maturities	273,950,000	226,455,000	208,228,000
Proceeds from sales	132,546,000	95,826,000	63,153,000
Principal pay downs and maturities of held-to-maturity securities	0	6,600,000	5,375,000
Purchase of investment tax credits	(29,437,000)	(32,484,000)	(40,355,000)
Proceeds from Sale (Payments to Purchase) Investment In Money Market	330,000	2,181,000	(1,968,000)
Proceeds from Life Insurance Policies	797,000	1,046,000	2,582,000
(Purchase) liquidation of restricted stock	(25,821,000)	4,911,000	750,000
Payments for (Proceeds from) Loans and Leases	(1,269,351,000)	(1,560,633,000)	(728,793,000)
Purchase of premises, equipment, and other assets, net	(10,856,000)	(13,925,000)	(18,873,000)
Proceeds from sale of other real estate owned and repossessed assets, net	45,627,000	25,918,000	43,242,000
Cash Acquired from Acquisition	342,427,000	0	21,204,000
Net cash used in investing activities	(1,366,443,000)	(1,386,013,000)	(1,173,342,000)
Cash flows from financing activities:
Net increase in deposits	1,357,855,000	1,093,353,000	1,045,173,000
Proceeds from Issuance of Subordinated Long-term Debt	150,000,000	0	0
Net (increase) decrease in borrowings	(257,038,000)	40,407,000	70,159,000
Payments of Debt Extinguishment Costs	0	(6,501,000)	(10,887,000)
Proceeds from exercise of common stock options	1,935,000	8,294,000	4,595,000
Redemption Of Preferred Stock	(70,500,000)	(70,500,000)	0
Excess tax benefit of stock-based compensation	5,874,000	4,194,000	1,552,000
Cash dividends paid on preferred stock	(750,000)	(1,387,000)	(1,410,000)
Proceeds from Issuance of Common Stock	28,288,000	13,746,000	0
Net cash provided by financing activities	1,213,875,000	1,081,606,000	1,109,182,000
Net increase (decrease) in cash and cash equivalents	60,244,000	(141,118,000)	100,889,000
Cash and cash equivalents at beginning of period	164,396,000	305,514,000	204,625,000
Cash and cash equivalents at end of period	224,640,000	164,396,000	305,514,000
Cash paid during the period for:
Interest	28,831,000	26,516,000	28,613,000
Income taxes	54,590,000	35,556,000	19,105,000
Non-cash investing and financing activity:
Transfers to other assets acquired through foreclosure, net	28,566,000	13,777,000	24,911,000
Change in unfunded LIHTC and SBIC commitments	39,617,000	9,798,000	50,000,000
Non-cash assets acquired in acquisition	1,587,186,000	0	410,827,000
Non-cash liabilities acquired in acquisition	1,764,996,000	0	421,987,000
Change in unrealized gain on AFS securities, net of tax	(6,502,000)	29,209,000	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	(4,276,000)
Change in unfunded obligations	(27,325,000)	(28,522,000)	(29,755,000)
Transfer of HTM securities to AFS, amortized cost	0	275,300,000	0
Unrealized gain on transfer of HTM securities to AFS, net of tax	0	$ 8,976,000	$ 0
Subordinated Debt [Member]
Cash flows from financing activities:
Proceeds from Debt, Net of Issuance Costs	$ 148,211,000

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division, with their results reported under the Company's Northern California operating segment.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Consolidated Financial Statements.

Principles of consolidation

On December 31, 2013, the Company consolidated its three bank subsidiaries under one bank charter, WAB. As the subsidiary bank mergers did not meet the definition of a business combination under the guidance of ASC 805, Business Combinations, the entities were combined in a method similar to a pooling of interests.

As of December 31, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal and non-profit loans, and leases; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after distributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Financial Statements as of and for the years ended December 31, 2015, 2014, and 2013 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Cash and cash equivalents

For purposes of reporting cash flows, cash and cash equivalents include cash on hand, amounts due from banks (including cash items in process of clearing), and federal funds sold. Cash flows from loans originated by the Company and customer deposit accounts are reported net.

The Company maintains amounts due from banks, which at times may exceed federally insured limits. The Company has not experienced any losses in such accounts.

Cash reserve requirements

Depository institutions are required by law to maintain reserves against their transaction deposits. The reserves must be held in cash or with the FRB. Banks are permitted to meet this requirement by maintaining the specified amount as an average balance over a two-week period. The total of reserve balances was approximately $37.9 million and $11.6 million as of December 31, 2015 and 2014, respectively.

Investment securities

Investment securities may be classified as HTM, AFS, or measured at fair value. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading securities measured at fair value are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Bank also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans, held for sale

Loans, held for sale consist primarily of SBA and CRE loans that the Company originates (or acquires) and intends to sell. These loans are carried at the lower of aggregate cost or fair value. Fair value is determined based on available market data for similar assets, expected cash flows, and appraisals of underlying collateral or the credit quality of the borrower. Gains and losses on the sale of loans are recognized pursuant to ASC 860, Transfers and Servicing. Interest income of these loans is accrued daily and loan origination fees and costs are deferred and included in the cost basis of the loan. The Company issues various representations and warranties associated with these loan sales. The Company has not experienced any losses as a result of these representations and warranties.

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Consolidated Financial Statements.

Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations, or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

Transfers of financial assets

Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed surrendered when the 1) assets have been isolated from the Company; 2) transferee obtains the right to pledge or exchange the transferred assets; and 3) Company no longer maintains effective control over the transferred assets through an agreement to repurchase the transferred assets before maturity.

Premises and equipment

Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed principally by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the terms of the lease or the estimated lives of the improvements, whichever is shorter. Depreciation and amortization is computed using the following estimated lives: 

	Years
Bank premises	31
Furniture, fixtures, and equipment	3 - 10
Leasehold improvements (1)	3 - 10

(1) Depreciation is recorded over the lesser of 3 to 10 years or the term of the lease.

Management periodically reviews premises and equipment in order to determine if facts and circumstances suggest that the value of an asset is not recoverable.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price over the fair value of the identifiable net assets acquired in accordance with applicable guidance. The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. Pursuant to this guidance, if the qualitative assessment indicates potential impairment, the Company will proceed with the two-step process. The first step tests for impairment, while the second step, if necessary, measures the impairment. The resulting impairment amount, if any, is charged to current period earnings as non-interest expense.

The Company’s intangible assets consist primarily of core deposit intangible assets that are amortized over periods ranging from 5 to 10 years. The Company considers the remaining useful lives of its core deposit intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its core deposit intangibles during the years ended December 31, 2015, 2014, or 2013.

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

Investments in low income housing credits

The Company invests in Limited Partnerships formed for the purpose of investing in low income housing projects, which qualify for federal LIHTC. These investments are expected to generate tax credits over a ten-year period. The Company adopted the amended guidance in ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, beginning on January 1, 2014 and accounts for these investments using the proportional amortization method. See "Note 15. Income Taxes" for the additional disclosures required under these amendments.

Bank owned life insurance

BOLI is carried at its cash surrender value with changes recorded in other non-interest income in the Consolidated Income Statements. The face amount of the underlying policies including death benefits was $361.7 million and $321.9 million as of December 31, 2015 and 2014, respectively. There are no loans offset against cash surrender values, and there are no restrictions as to the use of proceeds.

Customer repurchase agreements

The Company enters into repurchase agreements with customers, whereby it pledges securities against overnight investments made from the customer’s excess collected funds. The Company records these at the amount of cash received in connection with the transaction.

Stock compensation plans

The Company has the Incentive Plan, as amended, which is described more fully in "Note 11. Stockholders' Equity" of these Notes to Consolidated Financial Statements. Compensation expense for stock options and non-vested restricted stock awards is based on the fair value of the award on the measurement date which, for the Company, is the date of the grant and is recognized ratably over the service period of the award. The Company utilizes the Black-Scholes option-pricing model to calculate the fair value of stock options. The fair value of non-vested restricted stock awards is the market price of the Company’s stock on the date of grant.

See "Note 11. Stockholders' Equity" of these Notes to Consolidated Financial Statements for further discussion of stock options and restricted stock awards.

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit related to uncertain tax positions may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits from uncertain tax positions are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 15. Income Taxes" for further discussion on income taxes.

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at December 31, 2015 and 2014. The estimated fair value amounts for December 31, 2015 and 2014 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 17. Fair Value Accounting" in these Notes to Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances and other borrowed funds

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In November 2015, the FASB issued guidance within ASU 2015-17, Income Taxes. The amendments in ASU 2015-17 to Topic 740, Income Taxes, changes the presentation of deferred income tax liabilities and assets, from previously bifurcated current and noncurrent, to a single noncurrent amount on the classified statement of financial position. The amendment is effective from the annual period ending after December 15, 2016, and for and interim periods within those annual periods. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In January 2016, the FASB issued guidance within ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, contain the following elements: 1) require equity investments to be measured at fair value with changes in fair value recognized in net income; 2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in OCI the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; 7) clarifies that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to AFS securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item 5) above, early adoption of the amendments in this Update is not permitted. See discussion in Recently adopted accounting guidance below for further discussion of the Company's election to early adopt this element of ASU 2016-01.

Recently adopted accounting guidance

In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate CollateralizedConsumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In June 2014, the FASB issued guidance within ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings,and Disclosures. The amendments in ASU 2014-11 to Topic 860, Transfers and Servicing, change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The accounting changes are effective for the first interim or annual period beginning after December 15, 2014. The amendments also require disclosure of information about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. An entity will also be required to disclose information about repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014 and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.8 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs were not significant.

In the third quarter 2015, the Company elected early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. Under current GAAP, the acquirer is required to retrospectively adjust the provisional amounts recognized at the acquisition date with a corresponding adjustment to goodwill and is also required to revise comparative information for prior periods presented in the financial statements. The amendments in ASU 2015-16 to Topic 805, Business Combinations, require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this Update also require that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. An entity is required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. As a result of the adoption of this amended guidance, all measurement period adjustments identified during the quarter have been recognized in the current reporting period. As the closing date of the Bridge acquisition was June 30, 2015, Bridge's results of operations were not included in the Company's results until July 1, 2015. Accordingly, there are no amounts recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the measurement period adjustments identified and recognized during the current reporting period.

In January 2016, and effective January 1, 2015, the Company elected early adoption of an element of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which relates to the accounting for changes in the fair value of its own liabilities when the fair value option for financial instruments has been elected. As mentioned above, under this portion of this amended standard, the portion of the total change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value is presented separately in other comprehensive income rather than being recognized in the income statement at each reporting period. As the Company's junior subordinated debt are variable rate instruments, that fair value movement relates to credit risk and therefore the fair value adjustment qualifies for presentation in other comprehensive income. See "Note 10. Qualifying Debt" for additional detail on the impact that adoption has had on the current reporting period.

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Mergers, Acquisitions and Dispositions

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Mergers, Acquisitions and Dispositions

2. MERGERS, ACQUISITIONS AND DISPOSITIONS

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of WAL's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations have been included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $8.8 million for the year ended December 31, 2015, have been included in non-interest expense, of which approximately $0.9 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability.

The following table shows the recognized amounts of identifiable assets acquired and liabilities assumed at their as adjusted acquisition date fair values, which include all measurement period adjustments identified and recognized since July 1, 2015:

	As Adjusted
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,299
Investments in restricted stock	7,015
Loans	1,439,930
Premises and equipment	1,519
Other assets acquired through foreclosure	1,407
Bank owned life insurance	17,385
Investment in LIHTC	5,354
Intangible assets	14,997
Deferred tax assets, net	18,287
Other assets	19,993
Total assets	$	1,966,152
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	11,678
Total liabilities	1,764,996
Net assets acquired	$	201,156
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	266,413

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

The Company identified $6.8 million in measurement period adjustments since July 1, 2015, which have been reflected as an adjustment to increase goodwill. Due to early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments, as discussed in "Note 1. Summary of Significant Accounting Policies," these adjustments to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined, rather than retrospectively adjusting the provisional amounts at the acquisition date. Any effects on earnings from changes in the provisional amounts have been appropriately reflected in the Consolidated Income Statement for the year ended December 31, 2015. The significant measurement period adjustments relate to loans, net deferred tax assets, and other liabilities. The fair value of loans decreased as there were further adjustments made to the interest and credit marks on Bridge loans. The net deferred tax assets balance was adjusted to account for the tax effects of all the changes in the fair values of assets acquired and liabilities assumed. Other liabilities also increased to accrue for unrecorded expenses and other liabilities incurred prior to acquisition. Although further measurement period adjustments are not expected to be significant, the estimated fair value of tax related items and other liabilities are still preliminary and are subject to additional measurement period adjustments.

Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $26.0 million. The fair value of PCI loans totals $10.9 million, which is net of interest and credit marks of $5.7 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Consolidated Financial Statements for additional detail of the acquired loans.

In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill related to the acquisition totaled $266.4 million, which includes $6.8 million of measurement period adjustments identified and recognized since July 1, 2015. Goodwill has been allocated to the Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015. Management believes this methodology allocates goodwill to the reporting units in a manner consistent with the expected synergies of the combination. None of the goodwill recognized as part of the acquisition is expected to be deductible for income tax purposes.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be amortized over the remaining life of the trusts. See "Note 10. Qualifying Debt" of these Notes to Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge officer's based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the officer's service is terminated by Bridge or by the officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the officer's attainment of age 55 or, if the officer is already age 55 as of such termination of employment, on the first business day of January of the year following the officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and an employee compensation rate increase of 4.00% were used in determining the SERP liability as of June 30, 2015. See "Note 19. Employee Benefit Plans" of these Notes to the Consolidated Financial Statements for further detail and discussion of the SERP.

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Year Ended December 31,
	2015		2014
	(in thousands, except per share amounts)
Interest income	$	560,292	$	495,235
Non-interest income	37,073		38,768
Net income available to common stockholders (1)	205,099		164,165
Earnings per share - basic	1.90		1.64
Earnings per share - diluted	1.87		1.62

(1) Excludes acquisition / restructure related costs incurred by the Company of $8.8 million for the year ended December 31, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $6.8 million for the year ended December 31, 2015, respectively, and related tax effects.

PartnersFirst Discontinued Operations

The Company discontinued its affinity credit card business and presented these activities as discontinued operations. During the second quarter 2014, the Company shut down its remaining affinity credit card operations. Therefore, no additional discontinued operations have been reported.

The following table summarizes the operating results of the discontinued operations for the year ended December 31, 2014 and 2013: 

	Year Ended December 31,
	2014			2013
	(in thousands)
Operating revenue	$	(358	)	$	3,345
Non-interest expenses	(1,369		)	(4,855		)
Loss before income taxes	(1,727		)	(1,510		)
Income tax benefit	(569		)	(649		)
Net loss	$	(1,158	)	$	(861	)

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Investment Securities

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

3. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities at December 31, 2015 and 2014 are summarized as follows: 

	December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,059	$	(49	)	$	10,060
Commercial MBS issued by GSEs	19,147		72		(105		)	19,114
Corporate debt securities	12,769		482		—			13,251
CRA investments	34,722		—		(37		)	34,685
Municipal obligations	320,087		14,743		—			334,830
Preferred stock	108,417		4,286		(1,467		)	111,236
Private label commercial MBS	4,685		6		—			4,691
Private label residential MBS	261,530		5		(4,407		)	257,128
Residential MBS issued by GSEs	1,169,631		5,254		(4,664		)	1,170,221
Trust preferred securities	32,000		—		(7,686		)	24,314
U.S. treasury securities	2,996		—		(3		)	2,993
Total AFS securities	$	1,966,034	$	34,907	$	(18,418	)	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs								$	1,481

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

For additional information on the fair value changes of securities measured at fair value, see the trading securities table in "Note 17. Fair Value Accounting" of these Notes to Consolidated Financial Statements.

The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI for both debt and equity securities is a decline in the market value below the amount recorded for an investment, and taking into account the severity and duration of the decline. Another potential indication of OTTI is a downgrade below investment grade. In determining whether an impairment is OTTI, the Company considers the length of time and the extent to which the market value has been below cost, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions of its industry, and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery. For marketable equity securities, the Company also considers the issuer’s financial condition, capital strength, and near-term prospects.

For debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates, credit spreads, and industry and issuer-specific factors), the issuer’s financial condition, near-term prospects, and current ability to make future payments in a timely manner, as well as the issuer’s ability to service debt, and any change in agencies’ ratings at the evaluation date from the acquisition date and any likely imminent action.

The Company has reviewed securities for which there is an unrealized loss in accordance with its accounting policy for OTTI described above and determined that there were no impairment charges for the years ended December 31, 2015, 2014, and 2013. The Company does not consider any securities to be other-than-temporarily impaired as of December 31, 2015 and 2014. No assurance can be made that OTTI will not occur in future periods.

Information pertaining to securities with gross unrealized losses at December 31, 2015 and 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	December 31, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	49	$	1	$	—	$	—	$	49	$	1
Commercial MBS issued by GSEs	105		17,051		—		—		105		17,051
CRA investments	37		24,729		—		—		37		24,729
Preferred stock	377		10,542		1,090		14,761		1,467		25,303
Private label residential MBS	3,733		226,720		674		30,372		4,407		257,092
Residential MBS issued by GSEs	3,566		536,515		1,098		38,338		4,664		574,853
Trust preferred securities	—		—		7,686		24,314		7,686		24,314
U.S. treasury securities	3		2,006		—		—		3		2,006
Total AFS securities	$	7,870	$	817,564	$	10,548	$	107,785	$	18,418	$	925,349

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

At December 31, 2015 and 2014, the Company’s unrealized losses relate primarily to interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The total number of securities in an unrealized loss position at December 31, 2015 was 146, compared to 109 at December 31, 2014. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and industry analysis reports. Since material downgrades have not occurred and management does not intend to sell the debt securities in an unrealized loss position in the foreseeable future, none of the securities described in the above table or in this paragraph were deemed to be OTTI.

The preferred stock and trust preferred securities have yields based on floating rate LIBOR, which are highly correlated to the federal funds rate and have been negatively affected by the low rate environment. This has resulted in unrealized losses for these securities.

The amortized cost and fair value of securities as of December 31, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	December 31, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	62,852	$	63,114
After one year through five years	77,273		81,090
After five years through ten years	68,935		72,283
After ten years	301,981		314,882
Mortgage-backed securities	1,454,993		1,451,154
Total AFS securities	$	1,966,034	$	1,982,523

The following tables summarize the carrying amount of the Company’s investment ratings position as of December 31, 2015 and 2014: 

	December 31, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,060	$	—	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		—		—		—		—		19,114
Corporate debt securities	—		—		2,721		5,489		5,041		—		—		13,251
CRA investments	—		—		—		—		—		—		34,685		34,685
Municipal obligations	7,949		—		180,460		131,110		6,243		180		8,888		334,830
Preferred stock	—		—		—		—		79,955		23,655		7,626		111,236
Private label commercial MBS	4,691		—		—		—		—		—		—		4,691
Private label residential MBS	235,605		—		40		3,186		1,750		2,705		13,842		257,128
Residential MBS issued by GSEs	—		1,170,221		—		—		—		—		—		1,170,221
Trust preferred securities	—		—		—		—		24,314		—		—		24,314
U.S. treasury securities	—		2,993		—		—		—		—		—		2,993
Total AFS securities (1)	$	248,245	$	1,192,328	$	183,221	$	139,785	$	117,303	$	36,600	$	65,041	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	—	$	—	$	—	$	—	$	1,481

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Securities with carrying amounts of approximately $830.7 million and $755.5 million at December 31, 2015 and 2014, respectively, were pledged for various purposes as required or permitted by law.

The following table presents gross gains and losses on sales of investment securities: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Gross gains	$	1,144		$	1,118		$	1,569
Gross losses	(529		)	(361		)	(2,764		)
Net gains on sales of investment securities	$	615		$	757		$	(1,195	)

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Loans, Leases and Allowance for Credit Losses

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Loans, Leases and Allowance for Credit Losses

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company’s loan portfolio is as follows: 

	December 31,
	2015			2014
	(in thousands)
Loans, HFI
Commercial and industrial	$	5,114,257		$	3,326,708
Commercial real estate - non-owner occupied	2,283,536			2,052,566
Commercial real estate - owner occupied	2,083,285			1,732,888
Construction and land development	1,133,439			748,053
Residential real estate	322,939			299,402
Commercial leases	148,493			205,639
Consumer	26,905			33,009
Loans, net of deferred loan fees and costs	11,112,854			8,398,265
Allowance for credit losses	(119,068		)	(110,216		)
Total loans HFI	$	10,993,786		$	8,288,049

Net deferred loan fees and costs as of December 31, 2015 and 2014 total $19.2 million and $12.5 million, respectively. Net unamortized discounts on loans total $8.2 million and $7.5 million as of December 31, 2015 and 2014, respectively. Total loans held for investment are also net of interest rate and credit marks on acquired loans totaling $40.5 million and $27.1 million as of December 31, 2015 and 2014, respectively.

As of December 31, 2015, the Company also has $23.8 million of HFS loans.

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	December 31, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,078,968	$	445	$	362	$	3,510	$	4,317	$	2,083,285
Non-owner occupied	2,099,274		2,481		—		2,822		5,303		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	5,066,197		26,358		14,124		7,578		48,060		5,114,257
Leases	145,905		—		—		2,588		2,588		148,493
Construction and land development
Construction	694,527		—		—		—		—		694,527
Land	438,495		—		—		417		417		438,912
Residential real estate	317,677		888		159		4,215		5,262		322,939
Consumer	26,587		12		91		215		318		26,905
Total loans	$	11,046,589	$	30,184	$	14,736	$	21,345	$	66,265	$	11,112,854

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	December 31, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	749	$	3,253	$	4,002	$	339	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	11,851		2,822		14,673		—		30,226		8,601		38,827		2,171
Multi-family	—		—		—		—		—		—		—		—
Commercial and industrial
Commercial	3,263		15,026		18,289		2,671		2,621		496		3,117		703
Leases	—		2,588		2,588		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	1,892		417		2,309		—		2,686		2,640		5,326		805
Residential real estate	1,835		4,489		6,324		—		1,332		4,841		6,173		232
Consumer	—		196		196		18		25		188		213		83
Total	$	19,590	$	28,791	$	48,381	$	3,028	$	50,893	$	16,766	$	67,659	$	5,132

The reduction in interest income associated with loans on non-accrual status was approximately $2.5 million, $3.8 million, and $5.4 million for the years ended December 31, 2015, 2014, and 2013, respectively.

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as Special Mention, Substandard, Doubtful, and Loss. Substandard loans include those characterized by well-defined weaknesses and carry the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful, or risk rated eight, have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The final rating of Loss covers loans considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that warrant management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly.

The following tables present gross loans by risk rating: 

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,032,932	$	28,422	$	20,814	$	1,117	$	—	$	2,083,285
Non-owner occupied	2,054,428		14,867		35,282		—		—		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	4,962,930		76,283		74,294		750		—		5,114,257
Leases	140,531		4,580		794		2,588		—		148,493
Construction and land development
Construction	678,438		16,089		—		—		—		694,527
Land	420,819		362		17,731		—		—		438,912
Residential real estate	310,067		776		12,096		—		—		322,939
Consumer	26,438		209		258		—		—		26,905
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,799,558	$	140,932	$	104,232	$	1,867	$	—	$	11,046,589
Past due 30 - 59 days	1,907		271		28,006		—		—		30,184
Past due 60 - 89 days	4,077		385		10,274		—		—		14,736
Past due 90 days or more	—		—		18,757		2,588		—		21,345
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

The table below reflects the recorded investment in loans classified as impaired: 

	December 31,
	2015			2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	24,287		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	104,587			41,822
Total impaired loans	$	128,874		$	166,750
Valuation allowance related to impaired loans (3)	$	(4,658	)	$	(10,765	)

(1) Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

(2) Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

The following table presents impaired loans by class: 

	December 31,
	2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	23,153	$	44,893
Non-owner occupied	41,081		66,324
Multi-family	—		—
Commercial and industrial
Commercial	26,513		13,749
Leases	2,896		373
Construction and land development
Construction	—		—
Land	18,322		21,748
Residential real estate	16,575		19,300
Consumer	334		363
Total	$	128,874	$	166,750

A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to realizable value instead of establishing a valuation allowance and are included, when applicable, in the table above as “Impaired loans without a specific valuation allowance under ASC 310.” However, before concluding that an impaired loan needs no associated valuation allowance, an assessment is made to consider all available and relevant information for the method used to evaluate impairment and the type of loan being assessed. The valuation allowance disclosed above is included in the allowance for credit losses reported in the Consolidated Balance Sheets as of December 31, 2015 and 2014.

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Average balance on impaired loans	$	150,151	$	169,758	$	182,670
Interest income recognized on impaired loans	4,794		5,494		6,235
Interest recognized on non-accrual loans, cash basis	1,634		2,536		1,916

The following table presents average investment in impaired loans by loan class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	34,912	$	37,048	$	49,452
Non-owner occupied	56,360		68,821		56,110
Multi-family	—		—		89
Commercial and industrial
Commercial	17,534		16,168		15,023
Leases	2,948		410		727
Construction and land development
Construction	—		—		—
Land	19,561		21,580		27,326
Residential real estate	18,453		25,223		33,339
Consumer	383		508		604
Total	$	150,151	$	169,758	$	182,670

The average investment in TDR loans included in the average investment in impaired loans table above for the years ended December 31, 2015, 2014, and 2013 was $113.9 million, $126.6 million, and $141.8 million, respectively.

The following table presents interest income on impaired loans by class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	1,575	$	1,550	$	1,726
Non-owner occupied	1,560		1,484		2,043
Multi-family	—		1		—
Commercial and industrial
Commercial	288		745		1,087
Leases	—		—		—
Construction and land development
Construction	—		—		—
Land	785		1,021		1,288
Residential real estate	579		646		62
Consumer	7		47		29
Total	$	4,794	$	5,494	$	6,235

The Company is not committed to lend significant additional funds on these impaired loans.

The following table summarizes nonperforming assets: 

	December 31,
	2015		2014
	(in thousands)
Non-accrual loans (1)	$	48,381	$	67,659
Loans past due 90 days or more on accrual status	3,028		5,132
Troubled debt restructured loans (2)	70,707		84,720
Total nonperforming loans	122,116		157,511
Other assets acquired through foreclosure, net	43,942		57,150
Total nonperforming assets	$	166,058	$	214,661

(1) Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

(2) Includes accruing TDR loans only.

Loans Acquired in Bridge Acquisition

The following table presents information regarding the contractually required principal and interest payments receivable, cash flows expected to be collected, and the estimated fair value of loans acquired in the Bridge acquisition, as of June 30, 2015, the closing date of the transaction. The estimated fair value was decreased by $7.2 million for measurement period adjustments recognized during the six months ended December 31, 2015:

	As Adjusted
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal and interest payments:
PCI	$	17,899	$	3,127	$	—	$	2,509	$	—	$	23,535
Non-PCI	1,225,837		340,762		106,851		26,999		987		1,701,436
Total loans acquired	1,243,736		343,889		106,851		29,508		987		1,724,971
Cash flows expected to be collected:
PCI	10,066		1,570		—		2,088		—		13,724
Non-PCI	1,186,076		304,944		102,240		26,629		989		1,620,878
Total loans acquired	1,196,142		306,514		102,240		28,717		989		1,634,602
Fair value of loans acquired:
PCI	7,362		1,417		—		2,075		—		10,854
Non-PCI	1,076,742		229,306		99,080		23,023		925		1,429,076
Total loans acquired	$	1,084,104	$	230,723	$	99,080	$	25,098	$	925	$	1,439,930

Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Balance, at beginning of period	$	19,156		$	28,164		$	7,072
Additions due to acquisition of Bridge	857			—			—
Measurement period adjustments	38			—			22,318
Reclassifications from non-accretable to accretable yield (1)	1,747			6,052			9,817
Accretion to interest income	(3,996		)	(7,185		)	(7,182		)
Reversal of fair value adjustments upon disposition of loans	(1,877		)	(7,875		)	(3,861		)
Balance, at end of period	$	15,925		$	19,156		$	28,164

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowance for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Year Ended December 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			820			5,550			127			6,497
Recoveries	(1,872		)	(4,139		)	(2,181		)	(3,754		)	(203		)	(12,149		)
Provision	(1,454		)	(9,762		)	(3,539		)	18,411			(456		)	3,200
Ending balance	$	18,976		$	23,160		$	5,278		$	71,181		$	473		$	119,068
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	87			964			1,728			4,370			513			7,662
Recoveries	(2,160		)	(3,859		)	(1,896		)	(4,728		)	(459		)	(13,102		)
Provision	1,966			(6,176		)	(4,352		)	14,551			(1,263		)	4,726
Ending balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
2013
Beginning Balance	$	10,554		$	34,982		$	15,237		$	32,860		$	1,794		$	95,427
Charge-offs	1,538			8,648			5,922			4,000			1,371			21,479
Recoveries	(2,060		)	(2,758		)	(2,097		)	(5,037		)	(930		)	(12,882		)
Provision	3,443			2,972			228			5,760			817			13,220
Ending balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050

The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	18,230	$	914	$	—	$	—	$	21	$	24,287
Impaired loans with no allowance recorded	20,375		38,737		8,283		15,661		18,322		2,896		313		104,587
Total loans individually evaluated for impairment	23,153		41,081		26,513		16,575		18,322		2,896		334		128,874
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	15,198		62,205		2,445		2,992		—		—		—		82,840
Total recorded investment	$	2,083,285	$	2,283,536	$	5,114,257	$	322,939	$	1,133,439	$	148,493	$	26,905	$	11,112,854
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	19,233	$	969	$	—	$	—	$	21	$	25,345
Impaired loans with no allowance recorded	63,709		61,692		71,773		44,142		82,800		5,229		3,923		333,268
Total loans individually evaluated for impairment	66,487		64,036		91,006		45,111		82,800		5,229		3,944		358,613
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	20,227		88,181		7,820		3,536		—		—		—		119,764
Total unpaid principal balance	$	2,131,648	$	2,332,467	$	5,184,125	$	352,019	$	1,197,917	$	150,826	$	30,515	$	11,379,517
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	858	$	11	$	3,518	$	270	$	—	$	—	$	1	$	4,658
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	858		11		3,518		270		—		—		1		4,658
Loans collectively evaluated for impairment	10,953		11,302		65,806		5,008		18,976		1,857		472		114,374
Loans acquired with deteriorated credit quality	—		36		—		—		—		—		—		36
Total allowance for credit losses	$	11,811	$	11,349	$	69,324	$	5,278	$	18,976	$	1,857	$	473	$	119,068

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructurings

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. A TDR loan is also considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The following table presents information on the financial effects of TDR loans by class for the periods presented:

	Year Ended December 31, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	193		—		—		193		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	1	81		—		3		78		4
Consumer	—	—		—		—		—		—
Total	3	$	530	$	—	$	3	$	527	$	4

	Year Ended December 31, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	6	$	14,646	$	378	$	257	$	14,011	$	33
Non-owner occupied	5	16,976		—		60		16,916		15
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	6	2,655		—		—		2,655		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	2,687		—		47		2,640		—
Residential real estate	5	1,966		447		70		1,449		15
Consumer	—	—		—		—		—		—
Total	24	$	38,930	$	825	$	434	$	37,671	$	67

	Year Ended December 31, 2013
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	8	$	3,681	$	—	$	54	$	3,627	$	28
Non-owner occupied	5	10,735		1,030		63		9,642		14
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	13	4,809		—		19		4,790		11
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	286		—		—		286		1
Residential real estate	13	5,434		267		887		4,280		24
Consumer	2	74		—		5		69		3
Total	43	$	25,019	$	1,297	$	1,028	$	22,694	$	81

The following table presents TDR loans by class for which there was a payment default during the period: 

	Year Ended December 31,
	2015			2014			2013
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395	3	$	2,506
Non-owner occupied	—	—		2	984		3	1,490
Multi-family	—	—		—	—		—	—
Commercial and industrial
Commercial	—	—		3	369		3	1,089
Leases	—	—		—	—		—	—
Construction and land development
Construction	1	137		—	—		—	—
Land	—	—		—	—		2	330
Residential real estate	3	1,047		1	202		4	955
Consumer	—	—		—	—		—	—
Total	4	$	1,184	8	$	1,950	15	$	6,370

A TDR loan is deemed to have a payment default when it becomes past due 90 days, goes on non-accrual, or is restructured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses.

At December 31, 2015 and 2014, there was $0.1 million and $1.2 million, respectively, in loan commitments outstanding on TDR loans.

Loan Purchases and Sales

For the years ended December 31, 2015 and 2014, secondary market loan purchases totaled $137.2 million and $166.4 million, respectively. For 2015, these purchased loans consisted of $117.1 million of commercial and industrial loans, $13.2 million of commercial real estate loans, $6.8 million in commercial leases, and $0.1 million of construction and land development loans. For 2014, these purchased loans consisted primarily of commercial and industrial loans. In addition, the Company periodically acquires newly originated loans at closing through participations or loan syndications.

During the year ended December 31, 2015, the Company sold loans, which consisted primarily of commercial and industrial and commercial mortgage-backed securities loans, with a carrying value of $102.2 million and recognized a gain of $0.5 million on the sales. The Company had no significant loan sales in 2014.

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Premises and Equipment (Notes)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

5. PREMISES AND EQUIPMENT

 The following is a summary of the major categories of premises and equipment:

	December 31,
	2015			2014
	(in thousands)
Bank premises	$	83,431		$	82,494
Land and improvements	33,971			33,971
Furniture, fixtures, and equipment	40,025			51,320
Leasehold improvements	18,958			18,160
Construction in progress	1,999			848
Total	178,384			186,793
Accumulated depreciation and amortization	(59,849		)	(72,975		)
Premises and equipment, net	$	118,535		$	113,818

Lease Obligations

The Company leases certain premises and equipment under non-cancelable operating leases expiring through 2025. The following is a schedule of future minimum rental payments under these leases at December 31, 2015: 

	(in thousands)
2016	$	8,547
2017	7,999
2018	7,536
2019	6,628
2020	4,986
Thereafter	8,879
Total future minimum rental payments	$	44,575

The Company leases the majority of its office locations and many of these leases contain multiple renewal options and provisions for increased rents. Total rent expense of $8.1 million, $6.2 million, and $6.9 million is included in occupancy expense for the years ended December 31, 2015, 2014, and 2013, respectively. Total depreciation expense of $7.7 million, $6.0 million, and $6.0 million is included in occupancy expense for the years ended December 31, 2015, 2014, and 2013, respectively.

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Other Assets Acquired Through Foreclosure

12 Months Ended

Dec. 31, 2015

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Other Assets Acquired Through Foreclosure

6. OTHER ASSETS ACQUIRED THROUGH FORECLOSURE

The following table represents the changes in other assets acquired through foreclosure: 

	Year Ended December 31,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,407			—			1,407
Transfers to other assets acquired through foreclosure, net	28,566			—			28,566
Proceeds from sale of other real estate owned and repossessed assets, net	(51,038		)	5,411			(45,627		)
Valuation adjustments, net	—			(182		)	(182		)
Gains, net (1)	2,628			—			2,628
Balance, end of period	$	52,984		$	(9,042	)	$	43,942
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	13,777			—			13,777
Proceeds from sale of other real estate owned and repossessed assets, net	(33,643		)	7,725			(25,918		)
Valuation adjustments, net	—			(294		)	(294		)
Gains, net (1)	2,866			—			2,866
Balance, end of period	$	71,421		$	(14,271	)	$	57,150
	2013
Balance, beginning of period	$	113,474		$	(36,227	)	$	77,247
Additions from acquisition of Centennial	5,622			—			5,622
Transfers to other assets acquired through foreclosure, net	24,911			—			24,911
Proceeds from sale of other real estate owned and repossessed assets, net	(61,510		)	18,268			(43,242		)
Valuation adjustments, net	—			(3,743		)	(3,743		)
Gains, net (1)	5,924			—			5,924
Balance, end of period	$	88,421		$	(21,702	)	$	66,719

(1) Includes net gains related to initial transfers to other assets of $0.9 million, $0.1 million, and $0.9 million during the years ended December 31, 2015, 2014, and 2013 respectively, pursuant to accounting guidance.

At December 31, 2015, 2014, and 2013, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 39 properties at December 31, 2015, compared to 67 at December 31, 2014.

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Deposits (Notes)

12 Months Ended

Dec. 31, 2015

Deposit [Abstract]

Deposits [Abstract]

8. DEPOSITS

The table below summarizes deposits by type: 

	December 31,
	2015		2014
	(in thousands)
Non-interest-bearing demand	$	4,093,976	$	2,288,048
Interest-bearing demand	1,028,073		854,935
Savings and money market	5,296,921		3,869,699
Certificate of deposit ($250,000 or more)	1,569,525		1,339,238
Other time deposits	42,129		579,123
Total deposits	$	12,030,624	$	8,931,043

The summary of the contractual maturities for all time deposits as of December 31, 2015 is as follows: 

	December 31, 2015
	(in thousands)
2016	$	1,507,050
2017	88,184
2018	9,633
2019	3,552
2020	3,235
Total	$	1,611,654

WAB is a member of CDARS and ICS, which provide mechanisms for obtaining FDIC insurance on large deposits. Federal banking law and regulation places restrictions on depository institutions regarding brokered deposits because of the general concern that these deposits are not relationship based and are at a greater risk of being withdrawn, thus posing liquidity risk for institutions that gather brokered deposits in significant amounts. At December 31, 2015 and 2014, the Company had $517.5 million and $700.7 million, respectively, of reciprocal CDARS deposits and $714.4 million and $481.2 million, respectively, of ICS deposits. At December 31, 2015 and 2014, the Company had $184.2 million and $257.0 million, respectively, of wholesale brokered deposits. There were also $365.6 million and $202.4 million of additional deposits as of December 31, 2015 and 2014, respectively, that the Company considers core deposits, but which are classified as brokered deposits for regulatory reporting purposes.

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Accumulated Other Comprehensive Income

12. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Unrealized gain on cash flow hedge			Total
	(in thousands)
Balance, December 31, 2012	$	8,065		$	—	$	—		$	144	$	17		$	8,226
Other comprehensive income before reclassifications	(30,503		)	—		—			—		(17		)	(30,520		)
Amounts reclassified from accumulated other comprehensive income	748			—		—			—		—			748
Net current-period other comprehensive (loss)	(29,755		)	—		—			—		(17		)	(29,772		)
Balance, December 31, 2013	$	(21,690	)	$	—	$	—		$	144	$	—		$	(21,546	)
Transfer of HTM securities to AFS	8,976			—		—			—		—			8,976
Other comprehensive income before reclassifications	29,683			—		—			—		—			29,683
Amounts reclassified from accumulated other comprehensive income	(474		)	—		—			—		—			(474		)
Net current-period other comprehensive income	38,185			—		—			—		—			38,185
Balance, December 31, 2014	$	16,495		$	—	$	—		$	144	$	—		$	16,639
Balance, January 1, 2015 (1)	16,495			—		16,309			144		—			32,948
Transfer of HTM securities to AFS	—			—		—			—		—			—
Other comprehensive income before reclassifications	(6,117		)	90		(4,276		)	—		—			(10,303		)
Amounts reclassified from accumulated other comprehensive income	(385		)	—		—			—		—			(385		)
Net current-period other comprehensive (loss) income	(6,502		)	90		(4,276		)	—		—			(10,688		)
Balance, December 31, 2015	$	9,993		$	90	$	12,033		$	144	$	—		$	22,260

(1)    As adjusted, see "Note 10. Qualifying Debt" for further discussion.

The following table presents reclassifications out of accumulated other comprehensive income: 

	Year Ended December 31,
Income Statement Classification	2015			2014			2013
	(in thousands)
Gain (loss) on sales of investment securities, net	$	615		$	757		$	(1,195	)
Income tax (expense) benefit	(230		)	(283		)	447
Net of tax	$	385		$	474		$	(748	)

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Other Borrowings

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Other Borrowings

9. OTHER BORROWINGS

The following table summarizes the Company’s borrowings as of December 31, 2015 and 2014: 

	December 31,
	2015		2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	150,000		96,987
Other short-term debt	—		58,182
Total short-term borrowings	$	150,000	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

The Company maintains other lines of credit with correspondent banks totaling $70.0 million, of which $25.0 million is secured by pledged securities and has a floating interest rate of one-month or three-month LIBOR plus 1.50%. The remaining $45.0 million is unsecured and has a floating interest rate of one-month LIBOR plus 3.25%. As of December 31, 2015, there were no outstanding balances on the Company's lines of credit. At December 31, 2014, the Company had revolving lines of credit with other institutions with outstanding advances totaling $25.0 million, at an interest rate of 1.75%. In addition, the Bank has entered into federal funds credit line agreements with correspondent banks under which it can borrow up to $100.0 million on an unsecured basis at the federal funds rate in effect at the time of borrowing. There were no amounts outstanding on these lines of credit as of December 31, 2015 and 2014. The lending institutions will determine the interest rate charged on funds at the time of the borrowing.

The Company maintains lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. At December 31, 2015, there were $150.0 million in short-term FHLB advances, consisting primarily of overnight advances. The weighted average interest rate on these FHLB advances as of December 31, 2015 was 0.36%. At December 31, 2014, short-term FHLB advances of $97.0 million had a weighted average interest rate of 1.24%.

At December 31, 2014, Senior Notes had a carrying value of $58.2 million. During the year ended December 31, 2015, the Senior Notes matured, resulting in a $58.2 million decrease to other short-term debt.

During 2015, the Company paid off $200.0 million of FHLB advances classified as long-term for a loss on extinguishment of $0.1 million. As of December 31, 2014, long-term FHLB advances of $210.1 million had a weighted average interest rate of 1.06%.

As of December 31, 2015 and 2014, the Company had additional available credit with the FHLB of approximately $1.54 billion and $935.0 million, respectively, and with the FRB of approximately $1.21 billion and $1.15 billion, respectively.

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Qualifying Debt Qualifying Debt (Notes)

12 Months Ended

Dec. 31, 2015

Qualifying Debt Disclosure [Abstract]

Subordinated Borrowings Disclosure [Text Block]

10. QUALIFYING DEBT

Subordinated Debt

On June 29, 2015, the Company issued $150.0 million of subordinated debt, which was recorded net of debt issuance costs of $1.8 million, and matures July 15, 2025. The subordinated debt has a fixed interest rate of 5.00% through June 30, 2020 and then converts to a variable rate of 3.20% plus three-month LIBOR through maturity. The carrying value of subordinated debt also includes the effective portion of related hedges and is $152.0 million at December 31, 2015.

Junior Subordinated Debt

The Company has formed or acquired through mergers, eight statutory business trusts, including two new business trusts, Bridge Capital Trust I and Bridge Capital Trust II, acquired in the acquisition of Bridge on June 30, 2015. These trusts exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities. All of the funds raised from the issuance of these securities were passed to the Company and are reflected in the accompanying Consolidated Balance Sheets as junior subordinated debt, with a carrying value of $58.4 million as of December 31, 2015.

The junior subordinated debt has contractual balances and maturity dates as follows: 

		December 31,
Name of Trust	Maturity	2015			2014
At fair value		(in thousands)
BankWest Nevada Capital Trust II	2033	$	15,464		$	15,464
Intermountain First Statutory Trust I	2034	10,310			10,310
First Independent Statutory Trust I	2035	7,217			7,217
WAL Trust No. 1	2036	20,619			20,619
WAL Statutory Trust No. 2	2037	5,155			5,155
WAL Statutory Trust No. 3	2037	7,732			7,732
Total contractual balance		66,497			66,497
FVO on junior subordinated debt		(19,569		)	(26,060		)
Junior subordinated debt, at fair value		$	46,928		$	40,437
At amortized cost
Bridge Capital Holdings Trust I	2035	$	12,372		$	—
Bridge Capital Holdings Trust II	2036	5,155			—
Total contractual balance		17,527			—
Purchase accounting adjustment, net of accretion (1)		(6,085		)	—
Junior subordinated debt, at amortized cost		$	11,442		$	—
Total junior subordinated debt		$	58,370		$	40,437

(1) The purchase accounting adjustment will be accreted over the remaining life of the trusts, pursuant to accounting guidance.

With the exception of debt issued by Bridge Capital Trust I and Bridge Capital Trust II, junior subordinated debt is recorded at fair value at each reporting date due to the FVO election made by the Company under ASC 825. The Bridge junior subordinated debt was initially recorded at a fair value of $11.3 million on June 30, 2015, which includes a fair market value purchase accounting adjustment of $6.2 million that will be accreted over the remaining life of the debt. The Company did not make the FVO election for the Bridge junior subordinated debt. Accordingly, the carrying value of these trusts at each future reporting date will not reflect the current fair value of the debt.

The weighted average interest rate of all junior subordinated debt as of December 31, 2015 was 2.95%, which is three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 2.73% at December 31, 2014.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB, the Company's securities continue to qualify as Tier 1 Capital.

Adoption of ASU 2016-01

The following table presents the impact of the Company's election to early adopt an element of ASU 2016-01 issued by the FASB in January 2016 related to changes in the fair value of a liability resulting from a change in the instrument-specific credit risk when the fair value option for financial instruments has been elected and its retrospective application for the periods indicated. The cumulative effect of adoption of this guidance at January 1, 2015 was a decrease to retained earnings of $16.3 million and a corresponding increase to accumulated other comprehensive income.

	Sep 30, 2015		Jun 30, 2015			Mar 31, 2015
	(in thousands)
Consolidated Balance Sheet:
Stockholders' equity
Accumulated other comprehensive income
As previously reported	$	20,643	$	15,348		$	23,423
As reported under new guidance	35,276		26,707			39,538
Retained earnings
As previously reported	218,897		159,939			125,467
As reported under new guidance	204,264		148,580			109,352
	Three Months Ended
	Sep 30, 2015		Jun 30, 2015			Mar 31, 2015
	(in thousands, except per share data)
Consolidated Income Statement:
Non-interest income
As previously reported	$	13,826	$	(2,191	)	$	5,933
As reported under new guidance	8,502		5,545			6,242
Income tax expense
As previously reported	19,183		10,599			14,118
As reported under new guidance	17,133		13,579			14,234
Net income
As previously reported	59,134		34,719			40,190
As reported under new guidance	55,860		39,475			40,383
Net income available to common shareholders
As previously reported	58,958		34,472			40,014
As reported under new guidance	55,684		39,228			40,207
Earnings per share applicable to common shareholders--basic
As previously reported	0.59		0.39			0.46
As reported under new guidance	0.55		0.44			0.46
Earnings per share applicable to common shareholders--diluted
As previously reported	0.58		0.39			0.45
As reported under new guidance	0.55		0.44			0.45

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Stockholders' Equity

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Stockholder's Equity

11. STOCKHOLDERS' EQUITY

Preferred Stock

On September 27, 2011, the Company received $141.0 million from the issuance of 141,000 shares of non-cumulative perpetual preferred stock, Series B, par value of $0.0001 per share and a liquidation preference of $1,000 per share, to the U.S. Treasury Department under the SBLF.

On December 31, 2014, the Company redeemed 70,500 of its 141,000 shares of non-cumulative perpetual preferred stock, Series B. The shares were redeemed at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

On December 18, 2015, the Company redeemed its remaining 70,500 shares of non-cumulative perpetual preferred stock, Series B. The shares were redeemed at their liquidation value of $1,000 per share plus accrued dividends for a total redemption price of $70.7 million.

Common Stock Issuance

In Connection with Bridge Acquisition

Under the terms of the Bridge merger agreement, each share of Bridge common stock issued and outstanding as of June 30, 2015, the acquisition date, was exchanged for 0.8145 shares of WAL common stock and $2.39 in cash. This resulted in the issuance of 12,451,240 shares, or $420.4 million, of the Company's common stock and payment of $36.5 million in cash.

Under ATM Distribution Agreement

On June 4, 2014, the Company entered into a distribution agency agreement with Credit Suisse Securities (USA) LLC, under which the Company may sell shares of its common stock up to an aggregate offering price of $100.0 million on the New York Stock Exchange. The parties executed an Amended and Restated Distribution Agency Agreement on October 30, 2014. The Company pays Credit Suisse Securities (USA) LLC a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary.

Sales in the ATM offering were previously being made pursuant to a prospectus dated May 14, 2012 and a prospectus supplement filed with the SEC on June 4, 2014, in connection with one or more offerings of shares from the Company's shelf registration statement on Form S-3 (No. 333-181128), which expired on May 14, 2015. On May 7, 2015, the Company filed with the SEC a new shelf registration statement on Form S-3 (No. 333-203959). During the year ended December 31, 2015, the Company sold 760,376 shares under the ATM offering at a weighted-average selling price of $38.13 per share for gross proceeds of $29.0 million. Total related offering costs were $0.7 million, of which $0.5 million relates to compensation costs paid to Credit Suisse Securities (USA) LLC. During the year ended December 31, 2014, the Company sold 548,122 shares under the ATM offering at a weighted-average selling price of $25.96 per share for gross proceeds of $14.2 million. Total related offering costs were $0.5 million, of which $0.2 million relates to compensation costs paid to Credit Suisse Securities (USA) LLC.

Stock-Based Compensation

Equity Awards Assumed in Bridge Acquisition

In connection with the Bridge acquisition, the Company assumed unvested restricted stock awards and stock options originally granted by Bridge and converted them into WAL restricted stock awards and stock options. Bridge equity awards were converted into WAL equity awards at a conversion ratio of 0.905, resulting in the issuance of 546,151 shares of WAL restricted stock and 213,091 of WAL options. The portion of the fair value of these equity awards associated with prior service of Bridge employees represents a component of the total consideration for the Bridge acquisition, which totaled $10.7 million.

Bridge's restricted stock awards generally had an original vesting period of five years. The remaining vesting period of these awards remained unchanged upon conversion. The value of restricted stock replacement awards were based on WAL's stock price as of the acquisition date and totaled $17.0 million as of June 30, 2015, of which $9.0 million is considered purchase price consideration for pre-combination service and $8.0 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the awards. During the year ended December 31, 2015, the Company recognized $1.7 million in compensation expense related to these awards.

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

The value of assumed stock options as of June 30, 2015 totaled $4.1 million, of which $1.7 million is considered purchase price consideration for pre-combination service and $2.4 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the options. During the year ended December 31, 2015, the Company recognized $0.5 million in compensation expense related to these awards.

Stock Awards and Stock Options

The Incentive Plan, as amended, gives the Board of Directors the authority to grant up to 10.5 million stock awards consisting of unrestricted stock, stock units, dividend equivalent rights, stock options (incentive and non-qualified), stock appreciation rights, restricted stock, and performance and annual incentive awards. Stock awards available for grant at December 31, 2015 were 3.2 million.

The Incentive Plan contains certain individual limits on the maximum amount that can be paid in cash under the Incentive Plan and on the maximum number of shares of common stock that may be issued pursuant to the Incentive Plan in a calendar year. In 2012, stockholders approved an amendment to the Incentive Plan that 1) increased by 2,000,000 the maximum number of shares available for issuance thereunder; 2) increased the maximum number of shares of stock that can be awarded to any person eligible for an award thereunder to 300,000 per calendar year; and 3) provided for additional business criteria upon which performance-based awards may be based thereunder. In 2014, stockholders approved an amendment to the Incentive Plan that increased the maximum number of shares available for issuance by 2,000,000.

Restricted stock awards granted to employees in 2015 and 2014 generally vest over a three-year period. Stock grants made to non-employee WAL and WAB directors during 2015 includes both the annual grant that was fully vested at June 30, 2015 and a special grant to WAB directors that immediately vested in December 2015. The Company estimates the compensation cost for stock grants based upon the grant date fair value. Stock compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the stock issued during the year ended December 31, 2015 was $12.6 million. For the year ended December 31, 2015, the Company recognized $9.3 million in stock-based compensation expense related to these stock grants, compared to $6.8 million in 2014.

In addition, the Company granted 52,200 shares of restricted stock to certain members of executive management that have both performance and service conditions that affect vesting. The performance condition was based on achieving an EPS target for fiscal year 2015. This EPS target was met as of December 31, 2015 and therefore the restricted stock awards will vest over a remaining two-year service period. The grant date fair value of the awards was $1.4 million. For the year ended December 31, 2015, the Company recognized $0.5 million in stock-based compensation expense related to these performance-based restricted stock grants, compared to no such stock-based compensation expense in 2014 or 2013.

A summary of the status of the Company’s unvested shares of restricted stock, including those issued in connection with the Bridge acquisition, and changes during the years then ended is presented below: 

	December 31,
	2015				2014
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
	(in thousands, except per share amounts)
Balance, beginning of period	1,050		$	16.19	1,204		$	9.71
Granted	509		27.55		508		23.90
Issued in acquisition of Bridge	546		14.70		—		—
Vested	(528	)	13.02		(566	)	9.57
Forfeited	(85	)	21.63		(96	)	15.05
Balance, end of period	1,492		$	20.46	1,050		$	16.19

The weighted average grant date fair value of stock awards granted during the years ended December 31, 2015, 2014, and 2013 was $12.6 million, $12.2 million, and $6.7 million, respectively. The total fair value of restricted stock that vested during the years ended December 31, 2015, 2014, and 2013 was $14.6 million, $13.3 million, and 6.8 million, respectively.

As of December 31, 2015, there was $18.5 million of total unrecognized compensation cost related to unvested share-based compensation arrangements granted under the Incentive Plan. That cost is expected to be recognized over a weighted average period of 2.19 years.

As of December 31, 2015, the Company has stock option awards outstanding related to options granted in 2011 as well as stock option awards converted in connection with the Bridge acquisition. The options granted in 2011 had a vesting period of 4 years, a contractual life of 7 years, and became fully vested in January 2015. The fair value of each option award was estimated on the date of grant using the Black-Scholes option valuation model. A summary of option activity during the year ended December 31, 2015 is presented below: 

	December 31, 2015
	Shares		Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
	(in thousands, except exercise price and contractual terms)
Outstanding options, beginning of period	217		$	9.70
Granted	—		—
Issued in acquisition of Bridge	213		22.02
Exercised	(182	)	10.62
Forfeited or expired	(24	)	23.89
Options outstanding, end of period	224		$	19.15	6.41	$	3,738
Options exercisable, end of period	94		$	11.72	3.67	$	2,278
Options expected to vest, end of period	97		$	24.49	8.38	$	1,691

The total intrinsic value of options exercised during the years ended December 31, 2015, 2014, and 2013 was $3.6 million, $7.1 million, and $2.8 million, respectively.

Performance Stock Units

The Company grants members of its executive management committee performance stock units that do not vest unless the Company achieves a specified cumulative EPS target over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. For the year ended December 31, 2015, the Company recognized $4.8 million in stock-based compensation expense related to these performance stock units, compared to $3.6 million in stock-based compensation expense for such units in 2014.

The three-year performance period for the 2012 grant ended on December 31, 2014, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, on February 18, 2015, executive management committee members were granted 285,000 of fully vested common shares.

The three-year performance period for the 2013 grant ended on December 31, 2015, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, 308,400 shares will become fully vested and be paid out to members of the executive management committee in February 2016.

As of December 31, 2015, outstanding performance stock unit grants made in 2014 and 2015 are expected to pay out at the maximum award amount, or 414,650 common shares.

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Derivatives and Hedging

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

13. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments through its subsidiary, WAB. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary type of derivatives that the Company uses are interest rate swaps. Generally, these instruments are used to help manage the Company's exposure to interest rate risk and meet client financing and hedging needs.

Derivatives are recorded at fair value in the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

As of December 31, 2015, 2014, and 2013, the Company does not have any significant outstanding cash flow hedges or free-standing derivatives.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) to another interest rate index.

The Company designates its “pay fixed/receive variable” interest rate swaps as fair value hedges. These contracts convert certain fixed-rate long-term loan assets into variable-rate assets, thereby modifying the Company's exposure to changes in interest rates. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts.

The Company entered into a "pay variable/receive fixed" interest rate swap agreement, designated as a fair value hedge, to hedge the interest rate exposure on its subordinated debt issuance. As a result, the Company is paying a floating rate of three month LIBOR plus 3.16% and is receiving semi-annual fixed payments of 5.00% to match the payments on the debt.

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair values of the Company's derivative instruments on a gross and net basis as of December 31, 2015, 2014, and 2013. The change in the notional amounts of these derivatives from December 31, 2013 to December 31, 2015 indicates the volume of the Company's derivative transaction activity during these periods. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties. The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	December 31, 2015						December 31, 2014						December 31, 2013
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,386	$	788
Total	800,478		3,569		64,785		647,703		7		57,820		294,997		2,386		788
Netting adjustments (1)	—		—		—		—		—		—		—		384		384
Net derivatives in the balance sheet	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,002	$	404

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Fair value hedges

An assessment of effectiveness is performed at initiation of a hedge and on a quarterly basis thereafter. All of the Company's fair value hedges remained “highly effective” as of December 31, 2015, 2014, and 2013.

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the years ended December 31, 2015, 2014, and 2013 which are recorded in unrealized (losses) gains on assets and liabilities measured at fair value, net in the income statement.

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Hedge of Fixed Rate Loans (a)
Loss on "pay fixed" swap	$	(6,965	)	$	(60,377	)	$	3,308
Gain on receive fixed rate loans	7,044			60,208			(3,317		)
Net ineffectiveness	$	79		$	(169	)	$	(9	)
Hedge of Fixed Rate Subordinated Debt (a)
Gain on "receive fixed" swap	$	3,569		$	—		$	—
Loss on subordinated debt	(3,569		)	—			—
Net ineffectiveness	$	—		$	—		$	—

(a) The fair value of derivatives contracts are carried as other assets and other liabilities in the Consolidated Balance Sheets. The effective portion of hedging gains (losses) are recorded as basis adjustments to the underlying hedged asset or liability. Gains and losses on both the hedging derivative and hedged item are recorded through non-interest expense with a resulting net income impact for the amount of ineffectiveness.

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected positive replacement value of the contracts. Management generally enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types. In general, the Company has a zero credit threshold with regard to derivative exposure with counterparties. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally holds collateral in the form of highly rated securities issued by the U.S. Treasury or government-sponsored enterprises, such as GNMA, FNMA, and FHLMC. The total collateral netted against net derivative liabilities totaled $61.7 million at December 31, 2015, $57.8 million at December 31, 2014, and $0.3 million at December 31, 2013.

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	December 31,
	2015		2014		2013
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	3,569	$	7	$	2,378
Collateral posted by this counterparty	4,680		—		2,002
Derivative liability with this counterparty	—		—		346
Collateral pledged to this counterparty	1,340		—		—
Net exposure after netting adjustments and collateral	$	229	$	7	$	—

Credit Risk Contingent Features

Management has entered into certain derivative contracts that require the Company to post collateral to the counterparties when these contracts are in a net liability position. Conversely, the counterparties post collateral when these contracts are in a net asset position. The amount of collateral to be posted is based on the amount of the net liability and exposure thresholds. As of December 31, 2015, 2014, and 2013 the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting provisions) held by the Company that were in a net liability position totaled $64.8 million, $57.8 million, and $0.4 million, respectively. As of December 31, 2015, the Company was in an over-collateralized net position of $15.5 million after considering $77.2 million of collateral held in the form of securities. As of December 31, 2014 and 2013, the Company was in an over-collateralized position of $14.2 million and $12.4 million, respectively.

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Earnings per Share (Notes)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

14. EARNINGS PER SHARE

Diluted EPS is based on the weighted average outstanding common shares during each period, including common stock equivalents. Basic EPS is based on the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands, except per share amounts)
Weighted average shares - basic	94,570		86,693		85,682
Dilutive effect of stock awards	649		813		859
Weighted average shares - diluted	95,219		87,506		86,541
Net income available to common stockholders	$	193,494	$	146,564	$	113,555
Earnings per share - basic	2.05		1.69		1.33
Earnings per share - diluted	2.03		1.67		1.31

The Company had zero, 1,500, and 163,300 stock options outstanding as of December 31, 2015, 2014, and 2013, respectively, which were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive.

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Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

15. INCOME TAXES

The provision for income taxes charged to operations consists of the following: 

	Year Ended December 31,
	2015		2014			2013
	(in thousands)
Current	$	61,040	$	55,572		$	43,547
Deferred	3,254		(7,182		)	(13,717		)
Total tax provision	$	64,294	$	48,390		$	29,830

The reconciliation between the statutory federal income tax rate and the Company’s effective tax rate are summarized as follows: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Income tax at statutory rate	$	90,489		$	69,125		$	50,979
Increase (decrease) resulting from:
State income taxes, net of federal benefits	5,783			4,904			3,016
Bank owned life insurance	(1,365		)	(1,578		)	(1,683		)
Tax-exempt income	(20,226		)	(15,006		)	(7,308		)
Deferred tax asset valuation allowance	(2,290		)	(2,104		)	(2,391		)
Bargain purchase gain	—			—			(3,775		)
Low income housing tax credits	(5,223		)	(3,872		)	(2,105		)
Tax benefit related to Western Liberty acquisition	—			—			(3,738		)
Other, net	(2,874		)	(3,079		)	(3,165		)
Total tax provision	$	64,294		$	48,390		$	29,830

The effective tax rate for the year ended December 31, 2015 was 24.87%, compared to 24.50% for the year ended December 31, 2014, and 20.48% for the year ended December 31, 2013. There was not a significant change in the effective tax rate from 2014 compared to 2015. The increase in the effective tax rate from 2013 compared to 2014 is primarily due to the increase in pre-tax book income and the absence of acquisition related benefits for the year ended December 31, 2014 compared to 2013.

The cumulative tax effects of the primary temporary differences are shown in the following table:

	December 31,
	2015			2014
	(in thousands)
Deferred tax assets:
Allowance for credit losses	$	47,431		$	42,038
Fair market value adjustment related to acquired loans	13,930			8,250
Stock-based compensation	12,069			4,749
Net operating loss carryovers	9,255			8,453
Tax credit carryovers	9,052			9,617
Startup costs and other amortization	4,771			5,113
Allowance for other assets acquired through foreclosure, net	4,280			7,343
Section 382 limited NUBILs	3,284			3,657
Other	13,686			8,188
Total gross deferred tax assets	117,758			97,408
Deferred tax asset valuation allowance	—			(2,290		)
Total deferred tax assets	117,758			95,118
Deferred tax liabilities:
Unrealized gain on debt instruments measured at fair value	(7,537		)	—
Deferred loan costs	(7,400		)	(6,041		)
Unrealized gain on AFS securities	(6,353		)	(9,949		)
Core deposit intangible	(6,093		)	(1,006		)
Premises and equipment	(2,039		)	(4,049		)
Unrealized gains on financial instruments measured at fair value	(1,000		)	(9,798		)
Other	(984		)	(1,589		)
Total deferred tax liabilities	(31,406		)	(32,432		)
Deferred tax assets, net	$	86,352		$	62,686

Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be reversed. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

For the year ended December 31, 2015, the net deferred tax assets increased$23.7 million to $86.4 million. This overall increase in the net deferred tax asset was primarily the result of increases to deferred tax assets from the effects of the Bridge acquisition; a change in fair market value of junior subordinated debt and AFS securities; and the increase in the allowance for credit losses.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $86.4 million at December 31, 2015 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies within the meaning of ASC 740, Income Taxes, that could be implemented if necessary to prevent a carryover from expiring.

As of December 31, 2015 and 2014, the Company had a deferred tax valuation allowance of zero and $1.8 million, respectively, related to net capital loss carryovers from the sale of preferred stock investments and zero and $0.5 million, respectively, related to IRC Section 382 limitations associated with the Company's acquisition of Western Liberty.

The deferred tax asset related to federal and state NOL carryovers outstanding at December 31, 2015 and 2014 available to reduce the tax liability in future years totaled $9.3 million and $8.5 million, respectively. The respective $9.3 million and $8.5 million of tax benefits relate entirely to federal NOL carryovers (subject to an annual limitation imposed by IRC Section 382). The Company’s ability to use federal NOL carryovers, as well as its ability to use certain future tax deductions called NUBILs associated with the Company's acquisitions of Western Liberty and Centennial, will be subject to separate annual limitations of $1.8 million and $1.6 million of deductions from taxable income, respectively. In management’s opinion, it is more-likely-than-not that the results of future operations will generate sufficient taxable income to realize all of the deferred tax benefits related to these NOL carryovers and NUBILs.

The Company files income tax returns in the U.S. federal jurisdiction and in various states. With few exceptions, the Company is no longer subject to U.S. federal, state, or local income tax examinations by tax authorities for years before 2011.

When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the Consolidated Financial Statements in the period in which, based on all available evidence, management believes it is more-likely-than-not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50% likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above would be reflected as a liability for unrecognized tax benefits in the accompanying Consolidated Balance Sheet along with any associated interest and penalties that would be payable to the taxing authorities upon examination.

The total gross activity of unrecognized tax benefits related to uncertain tax positions are shown in the following table:

	December 31,
	2015		2014
	(in thousands)
Beginning balance	$	—	$	—
Gross Increases
Tax positions in prior periods	1,038		—
Current period tax positions	—		—
Gross decreases
Tax positions in prior periods	—		—
Settlements	—		—
Lapse of statute of limitations	—		—
Ending balance	$	1,038	$	—

As of December 31, 2015, the total amount of unrecognized tax benefits, net of associated deferred tax benefit, that would impact the effective tax rate, if recognized, is $0.7 million. There were no unrecognized tax benefits as of December 31, 2014.

Interest and penalties related to unrecognized tax benefits are recognized in the provision for income taxes. During the year ended December 31, 2015, the Company recognized as part of its provision for income taxes, $0.1 million in penalties associated with unrecognized tax benefits and no amounts for interest. There were no amounts for interest and penalties recognized during the years ended December 31, 2014 and 2013.

As of December 31, 2015, the Company has accrued a $0.1 million liability for penalties and a $0.1 million liability for interest. As of December 31, 2014, there were no amounts accrued for interest or penalties.

Investments in LIHTC

The Company invests in LIHTC funds that are designed to generate a return primarily through the realization of federal tax credits.

Investments in LIHTC and unfunded LIHTC obligations are included as part of other assets and other liabilities, respectively, in the Consolidated Balance Sheets and total $152.7 million and $61.2 million, respectively, as of December 31, 2015, compared to $126.6 million and $51.4 million as of December 31, 2014. For the years ended December 31, 2015, 2014, and 2013, $14.4 million, $10.6 million, and $5.9 million of amortization related to LIHTC investments was recognized as a component of income tax expense, respectively.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

16. COMMITMENTS AND CONTINGENCIES

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheets.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of standby letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the standby letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Standby letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within one year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	December 31,
	2015		2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $341,374 at December 31, 2015 and $232,863 at December 31, 2014	$	3,624,578	$	2,164,523
Credit card commitments and financial guarantees	57,966		42,038
Standby letters of credit, including unsecured letters of credit of $4,257 at December 31, 2015 and $5,166 at December 31, 2014	50,659		49,556
Total	$	3,733,203	$	2,256,117

The following table represents the contractual commitments for lines and letters of credit by maturity at December 31, 2015: 

			Amount of Commitment Expiration per Period
	Total Amounts Committed		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
	(in thousands)
Commitments to extend credit	$	3,624,578	$	1,588,558	$	1,401,293	$	267,284	$	367,443
Credit card commitments and financial guarantees	57,966		57,966		—		—		—
Standby letters of credit	50,659		42,749		5,749		2,161		—
Total	$	3,733,203	$	1,689,273	$	1,407,042	$	269,445	$	367,443

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are not included in the allowance for credit losses reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Consolidated Financial Statements and are accounted for as a separate loss contingency. This loss contingency for unfunded loan commitments and letters of credit was $3.3 millionand $2.1 million as of December 31, 2015 and 2014, respectively. Changes to this liability are adjusted through non-interest expense.

Concentrations of Lending Activities

The Company’s lending activities are driven in large part by the customers served in the market areas where the Company has branch offices in the states of Arizona, Nevada, and California. Despite the geographic concentration of lending activities, the Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations within four broad categories: geography, industry, product, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of December 31, 2015 and 2014, CRE related loans accounted for approximately 49% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at December 31, 2015 and 2014, respectively.

Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Other

The Company has entered into change in control agreements with certain named executives and other employees designated as executives by the Board of Directors. Under these agreements, in the event of a qualifying termination, each executive is entitled to receive 1) accrued benefits, payable in accordance with the Company’s normal payroll practice; 2) a lump sum cash severance payment in an amount equal to the sum of a) two times the executive’s annual base salary plus b) two times the executive's annual bonus; 3) any unpaid bonus that was earned by the executive in the prior year; and 4) reimbursement of paid group health premiums up to 24 months.

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Fair Value Accounting

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Accounting

17. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Consolidated Financial Statements.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels in the fair value hierarchy are recognized as of the end of the month following the event or change in circumstances that caused the transfer.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and results in the recognition of unrealized gains and losses on these items in earnings at each reporting date. The Company did not elect FVO treatment for assumed Bridge junior subordinated debt.

All securities for which the fair value measurement option had been elected are included in a separate line item in the Consolidated Balance Sheets as securities measured at fair value.

For the years ended December 31, 2015, 2014, and 2013 securities gains and losses from fair value changes were as follows:

	Changes in Fair Values for Items Measured at Fair Value Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings			Total Changes Included in OCI (1)
	(in thousands)
Year Ended December 31, 2015
Securities measured at fair value	$	(32	)	$	2	$	—		$	(30	)	$	—
Junior subordinated debt	(6,491		)	—		(2,151		)	(2,151		)	(4,276		)
Total	$	(6,523	)	$	2	$	(2,151	)	$	(2,181	)	$	(4,276	)
Year Ended December 31, 2014
Securities measured at fair value	$	(41	)	$	7	$	—		$	(34	)	$	—
Junior subordinated debt	1,421			—		(1,754		)	(333		)	—
Total	$	1,380		$	7	$	(1,754	)	$	(367	)	$	—
Year Ended December 31, 2013
Securities measured at fair value	$	(260	)	$	6	$	—		$	(254	)	$	—
Junior subordinated debt	(5,640		)	—		(1,823		)	(7,463		)	—
Total	$	(5,900	)	$	6	$	(1,823	)	$	(7,717	)	$	—

(1) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI, net of tax, rather than included in earnings, effective January 1, 2015. See Note 10. Qualifying Debt for further discussion.

There were no net gains or losses recognized during the years ended December 31, 2015, 2014, and 2013 on trading securities sold during the period.

Interest income on securities measured at fair value is accounted for similarly to those classified as AFS. Any premiums or discounts are recognized in interest income over the term of the securities. For MBS, estimates of prepayments are considered in the constant yield calculations. Interest expense on junior subordinated debt is also determined under a constant yield calculation.

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

Securities measured at fair value: All of the Company’s securities measured at fair value, which consist of MBS, are reported at fair value utilizing Level 2 inputs in the same manner as described below for AFS securities.

AFS securities: Preferred stock, mutual funds, and CRA investments are reported at fair value utilizing Level 1 inputs. With the exception of CDO securities, other securities classified as AFS are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things. The Company estimates the fair value of CDO securities utilizing Level 3 inputs, which include pricing indications from comparable securities.

Independent pricing service: Our independent pricing service provides pricing information on Level 1, 2, and 3 securities, and represents the pricing source for the majority of the portfolio. Management independently evaluates the fair value measurements received from the Company's third party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities' valuations from the previous quarter. Then, management obtains market values from additional sources. The pricing service provides management with observable market data including interest rate curves and mortgage prepayment speed grids, as well as dealer quote sheets, new bond offering sheets, and historical trade documentation. Management reviews the assumptions and decides whether they are reasonable. Management may compare interest rates, credit spreads, and prepayments speeds used as part of the assumptions to those that management believes are reasonable. Management may price securities using the provided assumptions to determine whether they can develop similar prices on like securities. Any discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and the Company’s other valuation advisors. Lastly, management selects a sample of investment securities and compares the values provided by its primary third party pricing service to the market values obtained from secondary sources and evaluates those with notable variances.

Annually, the Company receives an SSAE 16 report from its independent pricing service attesting to the controls placed on the operations of the service from its auditor.

Interest rate swaps: Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates that it will pay the debt according to its contractual terms.

As of March 31, 2015, junior subordinated debt issued by the parent was valued under an NPV approach with a discount rate equal to a derived credit spread of 5.96% plus three-month LIBOR. Subsequently, on June 29, 2015, WAB issued $150.0 million of subordinated debt at a credit spread of 3.20% over LIBOR. Management deemed this to be a new observable market input relative to the Company's own credit risk. As of June 30, 2015, the junior subordinated debt was valued with an adjusted credit spread of 4.69%. This credit spread of 4.69% represents a reduction of 1.27% from the credit spread as of March 31, 2015, and a premium of 1.49% over the recent subordinated debt issuance by WAB, with such premium resulting from terms and features reflecting the greater level of subordination of the junior subordinated debt issued by the parent. This spread reduction resulted in a non-cash, non-recurring debt valuation loss of $7.7 million during the three months ended June 30, 2015. This charge had no effect on regulatory capital.

As of December 31, 2015, utilizing the methodology described above, the Company estimated the discount rate at 5.67%, which represents an implied credit spread of 5.06% plus three-month LIBOR (0.61%). As of December 31, 2014, the Company estimated the discount rate at 6.24%, which was a 5.99% credit spread plus three-month LIBOR (0.25%).

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	1,481
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,060	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		19,114
Corporate debt securities	—		13,251		—		13,251
CRA investments	34,685		—		—		34,685
Municipal obligations	—		334,830		—		334,830
Preferred stock	111,236		—		—		111,236
Private label commercial MBS	—		4,691		—		4,691
Private label residential MBS	—		257,128		—		257,128
Residential MBS issued by GSEs	—		1,170,221		—		1,170,221
Trust preferred securities	—		24,314		—		24,314
U.S. treasury securities	2,993		—		—		2,993
Total AFS securities	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Loans - HFS	$	—	$	23,809	$	—	$	23,809
Derivative assets (1)	—		3,569		—		3,569
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	46,928	$	46,928
Derivative liabilities (1)	—		64,785		—		64,785

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $64,184 and the net carrying value of subordinated debt includes a net negative value of $3,569 as of December 31, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

For the years ended December 31, 2015, 2014, and 2013, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Beginning balance	$	(40,437	)	$	(41,858	)	$	(36,218	)
Transfers into Level 3	—			—			—
Total gains (losses) for the period
Included in earnings (1)	—			1,421			(5,640		)
Included in other comprehensive income (2)	$	(6,491	)	$	—		$	—
Ending balance	$	(46,928	)	$	(40,437	)	$	(41,858	)

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, total losses for 2015 are included in the other comprehensive income line, Unrealized gain (loss) on junior subordinated debt, which is net of tax. The above amount represents the gross loss from changes in fair value of junior subordinated debt.

	CDO Securities
	Year Ended December 31,
	2015			2014		2013
	(in thousands)
Beginning balance	$	11,445		$	—	$	—
Transfers into Level 3	—			6,243		—
Total gains (losses) for the period
Included in other comprehensive income (3)	(1,385		)	5,202		—
Ending balance	$	10,060		$	11,445	$	—

(3) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized gain (loss) on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	December 31, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	46,928	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,060		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of December 31, 2015 was the "BB" rated financial over SWAP index and, as of December 31, 2014, was the "BB" rated 20-Year over Treasury Index with comparable credit spread. The input value used in the fair value measurement of the Company's junior subordinated debt was 5.67% and 6.24% as of December 31, 2015 and 2014, respectively.

The significant unobservable inputs used in the fair value measurement of the Company's CDO securities include securities terms, conditions, and underlying collateral type, as well as trustee and servicer reports, trade data on comparable securities, and market quotes that are converted into spreads to benchmark LIBOR curves. Significant increases or decreases in these inputs could result in significantly different fair value measurements.

Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of December 31, 2015:
Impaired loans with specific valuation allowance	$	19,629	$	—	$	—	$	19,629
Impaired loans without specific valuation allowance (1)	66,754		—		—		66,754
Other assets acquired through foreclosure	43,942		—		—		43,942
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $37.8 million and $3.8 million as of December 31, 2015 and 2014, respectively.

Impaired loans: The specific reserves for collateral dependent impaired loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on third-party appraisals. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal (which are generally obtained every twelve months), age of comparables included in the appraisal, and known changes in the market and in the collateral. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. These Level 3 impaired loans had an estimated fair value of $24.3 million and $124.9 million at December 31, 2015 and 2014, respectively. The fair value of these Level 3 impaired loans reflects the carrying value of each loan, which has been reduced by any deficit in appraised value compared to book value, estimated disposition costs, and estimated losses of similar impaired loans based on historical loss experience. Specific reserves in the allowance for loan losses for these loans were $4.7 million and $10.8 million at December 31, 2015 and 2014, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every twelve months. There is risk for subsequent volatility. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $43.9 million and $57.2 million of such assets at December 31, 2015 and 2014, respectively. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser, therefore qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement.

Credit vs. non-credit losses

Under the provisions of ASC 320, Investments-Debt and Equity Securities, OTTI is separated into the amount of total impairment related to the credit loss and the amount of the total impairment related to all other factors. The amount of the total OTTI related to the credit loss is recognized in earnings. The amount of the total impairment related to all other factors is recognized in OCI.

For the years ended December 31, 2015, 2014, and 2013, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of December 31, 2015 and 2014.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of the Company’s financial instruments is as follows: 

	December 31, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,982,523	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Trading	1,481		—		1,481		—		1,481
Derivative assets	3,569		—		3,569		—		3,569
Loans, net	11,017,595		—		10,766,826		86,383		10,853,209
Accrued interest receivable	54,445		—		54,445		—		54,445
Financial liabilities:
Deposits	$	12,030,624	$	—	$	12,034,199	$	—	$	12,034,199
Customer repurchases	38,155		—		38,155		—		38,155
FHLB advances	150,000		—		150,000		—		150,000
Qualifying debt	210,328		—		—		207,437		207,437
Derivative liabilities	64,785		—		64,785		—		64,785
Accrued interest payable	13,626		—		13,626		—		13,626

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Qualifying debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments as well as its future net interest income will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits. As of December 31, 2015, the Company’s interest rate risk profile was within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to prohibit an interest rate risk profile that does not conform to both management and BOD risk tolerances. There is also ALCO reporting at the Parent company level for reviewing interest rate risk for the Company, which gets reported to the BOD and the Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at December 31, 2015 and 2014 was insignificant. Loan commitments on which the committed interest rates were less than the current market rate were also insignificant at December 31, 2015 and 2014.

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Regulatory Capital Requirements

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Regulatory Capital Requirements

18. REGULATORY CAPITAL REQUIREMENTS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of Common Equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

As of December 31, 2015 and 2014, the Company and the Bank exceeded the capital levels necessary to be classified as well-capitalized, as defined by the federal banking agencies. The actual capital amounts and ratios for the Company and the Bank are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
December 31, 2015
WAL	$	1,603,472	$	1,341,011	$	13,193,563	$	13,683,148	12.2	%	10.2	%	9.8	%	9.7	%
WAB	1,485,070		1,213,304		13,073,394		13,561,251		11.4		9.3		9.0		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

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Segments

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Segments

22. SEGMENTS

The Company's reportable segments are aggregated primarily based on geographic location, services offered, and markets served. As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. As a substantial portion of Bridge's balance sheet is generated from nationally-focused business lines, the operations of these business lines are included in the CBL segment. Substantially all of the remaining assets and liabilities of Bridge are included in the Northern California segment. As the Bridge acquisition was completed on June 30, 2015, the results of operations of Bridge are included in the Company's Consolidated Income Statements beginning on July 1, 2015. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly.

The Arizona, Nevada, Southern California, and Northern California segments provide full service banking and related services to their respective markets although operations may not be domiciled in these states. The Company's CBL segment provides banking services to niche markets and, as of June 30, 2015, includes the operations of Bridge. These CBLs are managed centrally and are broader in geographic scope, though still predominately within the Company's core market areas. The Corporate & Other segment primarily relates to our Treasury division and also includes other corporate-related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 12% during the year, with a funds credit provided for the use of this equity as a funding source. Any excess or deficient equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average life of the assets or liabilities in the portfolio.

Net income amounts for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances, and average deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

On December 31, 2013, the Company consolidated its three bank subsidiaries under one charter, WAB. As a result, the Company redefined its operating segments to reflect the new organizational and internal reporting structure. The realignment of the Company's segments resulted in significant differences from the old segmentation methodology. Consequently, the Company determined that recasting prior year segment information to conform to the new segmentation methodology would be impracticable due to the substantial time and cost that would be involved in recasting this information. Also, given the incomparability of the reporting segments between periods, the Company determined that disclosure of the reportable segment information for the year ended December 31, 2014, as previously reported under the old basis, would not be beneficial to the reader as it does not assist the reader in better understanding the Company’s performance, assessing its prospects for future net cash flows or making more informed judgments about the Company as a whole, which are the primary objectives of ASC 280-10.

The following is a summary of selected operating segment information for the years ended December 31, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	9.5		$	2.4		$	2.4		$	—		$	2,250.3		$	2,266.9
Loans, net of deferred loan fees and costs	2,811.7			1,737.2			1,761.9			1,188.4			3,597.9			39.6			11,136.7
Less: allowance for credit losses	(30.1		)	(18.6		)	(18.8		)	(12.7		)	(38.5		)	(0.4		)	(119.1		)
Total loans	2,781.6			1,718.6			1,743.1			1,175.7			3,559.4			39.2			11,017.6
Other assets acquired through foreclosure, net	8.4			20.8			—			0.3			—			14.4			43.9
Goodwill and other intangible assets, net	—			24.8			—			158.2			122.4			—			305.4
Other assets	43.9			62.3			15.7			16.1			28.4			474.9			641.3
Total assets	$	2,836.2		$	1,836.0		$	1,761.2		$	1,352.7		$	3,710.2		$	2,778.8		$	14,275.1
Liabilities:
Deposits	$	2,880.7		$	3,382.8		$	1,902.5		$	1,541.1		$	2,134.4		$	189.1		$	12,030.6
Borrowings and qualifying debt	—			—			—			—			—			360.3			360.3
Other liabilities	12.2			29.0			7.8			11.2			105.1			127.4			292.7
Total liabilities	2,892.9			3,411.8			1,910.3			1,552.3			2,239.5			676.8			12,683.6
Allocated equity:	309.2			244.4			191.3			293.2			428.6			124.8			1,591.5
Total liabilities and stockholders' equity	$	3,202.1		$	3,656.2		$	2,101.6		$	1,845.5		$	2,668.1		$	801.6		$	14,275.1
Excess funds provided (used)	365.9			1,820.2			340.4			492.8			(1,042.1		)	(1,977.2		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Borrowings and qualifying debt	—			—			—			—			—			430.7			430.7
Other liabilities	17.4			40.8			8.9			0.2			72.4			98.2			237.9
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2015:	(in thousands)
Net interest income (expense)	$	129,914		$	122,082		$	94,585		$	56,698		$	124,222		$	(34,925	)	$	492,576
Provision for (recovery of) credit losses	3,099			(6,887		)	152			3,038			3,917			(119		)	3,200
Net interest income (expense) after provision for credit losses	126,815			128,969			94,433			53,660			120,305			(34,806		)	489,376
Non-interest income	4,204			9,202			2,697			5,161			4,110			4,394			29,768
Non-interest expense	(59,917		)	(59,553		)	(47,549		)	(30,161		)	(45,831		)	(17,595		)	(260,606		)
Income (loss) from continuing operations before income taxes	71,102			78,618			49,581			28,660			78,584			(48,007		)	258,538
Income tax expense (benefit)	27,893			27,516			20,849			12,051			29,469			(53,484		)	64,294
Net income	$	43,209		$	51,102		$	28,732		$	16,609		$	49,115		$	5,477		$	194,244

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2014:	(in thousands)
Net interest income (expense)	$	112,128		$	117,508		$	91,090		$	9,133		$	71,010		$	(15,976	)	$	384,893
Provision for (recovery of) credit losses	2,083			(7,542		)	(1,638		)	—			11,365			458			4,726
Net interest income (expense) after provision for credit losses	110,045			125,050			92,728			9,133			59,645			(16,434		)	380,167
Non-interest income	3,586			8,944			3,917			184			1,742			6,278			24,651
Non-interest expense	(54,859		)	(59,683		)	(49,764		)	(3,857		)	(27,804		)	(11,352		)	(207,319		)
Income (loss) from continuing operations before income taxes	58,772			74,311			46,881			5,460			33,583			(21,508		)	197,499
Income tax expense (benefit)	23,053			26,009			19,711			2,296			12,594			(35,273		)	48,390
Income from continuing operations	35,719			48,302			27,170			3,164			20,989			13,765			149,109
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	35,719		$	48,302		$	27,170		$	3,164		$	20,989		$	12,607		$	147,951

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Employee Benefit Plan (Notes)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

19. EMPLOYEE BENEFIT PLANS

The Company has a qualified 401(k) employee benefit plan for all eligible employees. Participants are able to defer between 1% and 100% (up to a maximum of $18,000 for those under 50 years of age and up to a maximum of $24,000 for those over 50 years of age in 2015) of their annual compensation. The Company may elect to match a discretionary amount each year, which was 50% of the first 6% of the participant’s compensation deferred into the plan. The Company’s total contribution was $2.2 million, $1.7 million, and $1.7 million for the years ended December 31, 2015, 2014, and 2013, respectively.

In addition, the Company maintains a non-qualified 401(k) restoration plan for the benefit of executives of the Company and certain affiliates. Participants are able to defer a portion of their annual salary and receive a matching contribution based primarily on the contribution structure in effect under the Company’s 401(k) plan, but without regard to certain statutory limitations applicable under the 401(k) plan. The Company’s total contribution to the restoration plan was $68,000, $77,000, and $64,000 for the years ended December 31, 2015, 2014, and 2013, respectively.

In connection with the Bridge acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge officers based on years of service and final average salary. The Company uses a December 31st measurement date for this plan.

The following table reflects the accumulated benefit obligation and funded status of the SERP from the June 30, 2015 acquisition date through December 31, 2015.

	Six Months Ended December 31, 2015
	(in thousands)
Change in benefit obligation
Benefit obligation at acquisition	$	7,122
Service cost	334
Interest cost	202
Actuarial (gains)/losses	(147		)
Expected benefits paid	(67		)
Projected benefit obligation at end of year	$	7,444
Unfunded projected/accumulated benefit obligation	(7,444		)
Additional liability	$	—
Weighted average assumptions to determine benefit obligation
Discount rate	5.75		%
Rate of compensation increase	4.00		%

The components of net periodic benefit cost recognized from the acquisition date through December 31, 2015 and the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost during 2016 are as follows:

	2016			Six Months Ended December 31, 2015
	(in thousands)
Components of net periodic benefit cost
Service cost	$	596		$	334
Interest cost	426			202
Amortization of prior service cost	96			60
Amortization of actuarial (gains)/losses	(96		)	(18		)
Net periodic benefit cost	$	1,022		$	578
Other comprehensive income (cost)	$	—		$	42

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Related Parties (Notes)

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Related Party Transactions

20. RELATED PARTY TRANSACTIONS

Principal stockholders, directors, and executive officers of the Company, together with the companies they control, are considered to be related parties. In the ordinary course of business, the Company has engaged in various related party transactions during the year, ranging from extending credit, accepting deposits as well as exchange of service transactions.

Federal banking regulations require that any such extensions of credit not be offered on terms more favorable than would be offered to non-related party borrowers of similar creditworthiness. The following table summarizes the aggregate activity in such loans for the periods indicated:

	Year Ended December 31,
	2015			2014
	(in thousands)
Balance, beginning	$	70,570		$	30,783
New loans	10,678			35,341
Advances	18,614			23,559
Repayments and other	(25,481		)	(19,113		)
Balance, ending	$	74,381		$	70,570

None of these loans are past due, on non-accrual status or have been restructured to provide a reduction or deferral of interest or principal because of deterioration in the financial position of the borrower. There were no loans to a related party that were considered classified loans at December 31, 2015 or 2014. The interest income associated with these loans was approximately $2.7 million and $1.9 million for the years ended December 31, 2015 and 2014, respectively.

Loan commitments outstanding with related parties totaled approximately $164.5 million and $151.8 million at December 31, 2015 and 2014, respectively.

The Company also accepts deposits from related parties which totaled $76.0 million and $47.7 million at December 31, 2015 and 2014, respectively, with related interest expense totaling less than $100 thousand during each of the years ended December 31, 2015 and 2014. In addition, the Company engages in certain activities with related parties for sponsorships, donations, and other services during the normal course of business. Those expenses totaled less than $1.0 million for the year ended December 31, 2015 and less than $2.0 million for the year ended December 31, 2014.

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Parent Company (Notes)

12 Months Ended

Dec. 31, 2015

Parent Company Financial Information [Abstract]

Parent Company Financial Information

21. PARENT COMPANY FINANCIAL INFORMATION

The condensed financial statements of the holding company are presented in the following tables:

WESTERN ALLIANCE BANCORPORATION

Condensed Balance Sheets

	December 31,
	2015		2014
	(in thousands)
ASSETS:
Cash and cash equivalents	$	7,627	$	11,855
Money market investments	122		451
Investment securities - AFS	50,507		51,335
Investment in bank subsidiaries	1,522,245		987,882
Investment in non-bank subsidiaries	2,424		9,827
Loans, net of deferred loan fees and costs and allowance for credit losses	35,635		39,221
Other assets acquired through foreclosure, net	14,471		16,318
Other assets	19,378		9,912
Total assets	$	1,652,409	$	1,126,801
LIABILITIES AND STOCKHOLDERS' EQUITY:
Other borrowings	$	—	$	83,182
Qualifying debt	58,370		40,437
Accrued interest and other liabilities	2,537		2,254
Total liabilities	60,907		125,873
Total stockholders’ equity	1,591,502		1,000,928
Total liabilities and stockholders’ equity	$	1,652,409	$	1,126,801

WESTERN ALLIANCE BANCORPORATION

Condensed Income Statements

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Income:
Dividends from subsidiaries	$	140,900	$	67,515	$	71,529
Interest income	4,593		4,381		2,847
Non-interest income	586		1,235		3,995
Total income	146,079		73,131		78,371
Expense:
Interest expense	6,671		8,776		10,833
Non-interest expense	11,397		10,348		32,001
Total expense	18,068		19,124		42,834
Income before income taxes and equity in undistributed earnings of subsidiaries	128,011		54,007		35,537
Income tax benefit	5,876		5,388		21,426
Income before equity in undistributed earnings of subsidiaries	133,887		59,395		56,963
Equity in undistributed earnings of subsidiaries	60,357		88,556		58,002
Net income	194,244		147,951		114,965
Dividends on preferred stock	750		1,387		1,410
Net income available to common stockholders	$	193,494	$	146,564	$	113,555

Western Alliance Bancorporation

Condensed Statements of Cash Flows

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	194,244		$	147,951		$	114,965
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net undistributed earnings of subsidiaries	(60,357		)	(88,556		)	(58,002		)
Excess tax benefit of stock-based compensation	(1,945		)	(4,194		)	(1,552		)
Junior subordinated debt change in fair value	—			(1,421		)	5,640
Loss on extinguishment of debt	—			502			1,387
Other operating activities, net	(4,734		)	(20,040		)	(4,011		)
Net cash provided by operating activities	127,208			34,242			58,427
Cash flows from investing activities:
Purchases of securities	—			(23,431		)	(2,044		)
Principal pay downs, calls, maturities, and sales proceeds of securities, net	2,358			8,376			6,767
Proceeds from sale of other repossessed assets, net	4,138			9,610			9,844
Capital contributions to subsidiaries	—			—			(40,000		)
Loans purchases, fundings, and principal collections, net	3,704			3,286			(35,979		)
Sale (purchase) of money market investments, net	330			2,181			(1,968		)
Sale (purchase) of premises, equipment, and other assets, net	—			617			(481		)
Net cash and cash equivalents (used) in acquisition (1)	(19,440		)	—			—
Net cash provided by (used in) investing activities	(8,910		)	639			(63,861		)
Cash flows from financing activities:
Proceeds from other borrowings, net	—			22,000			3,000
Excess tax benefit of stock-based compensation	1,945			4,194			1,552
Repayments on other borrowings	(83,444		)	(6,501		)	(10,887		)
Proceeds from issuance of common stock	28,288			13,746			—
Proceeds from exercise of stock options	1,935			8,294			4,595
Redemption of preferred stock	(70,500		)	(70,500		)	—
Cash dividends paid on preferred stock	(750		)	(1,387		)	(1,410		)
Net cash used in financing activities	(122,526		)	(30,154		)	(3,150		)
Net increase (decrease) in cash and cash equivalents	(4,228		)	4,727			(8,584		)
Cash and cash equivalents at beginning of year	11,855			7,128			15,712
Cash and cash equivalents at end of year	$	7,627		$	11,855		$	7,128
Supplemental disclosure:
Cash paid during the year for:
Interest	$	4,235		$	9,067		$	11,091
Income taxes	54,590			32,238			19,105
Non-cash investing and financing activity:
Change in unrealized gain on AFS securities, net of tax	1,199			2,031			2,450
Change in unrealized (loss) on TRUPS securities, net of tax	(4,276		)	—			—
Loan contributions to subsidiaries	183			2,663			—

(1) Cash acquired, less cash consideration paid of $36.5 million, resulted in a net $19.4 million use of cash and cash equivalents in the acquisition.

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Quarterly Financial Data (Notes)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data Disclosure [Abstract]

Quarterly Financial Information

23. QUARTERLY FINANCIAL DATA (UNAUDITED)

	Year Ended December 31, 2015
	Fourth Quarter			Third Quarter (1)			Second Quarter (1)			First Quarter (1)
	(in thousands, except share amounts)
Interest income	$	151,331		$	146,233		$	116,618		$	110,962
Interest expense	7,988			8,826			7,900			7,854
Net interest income	143,343			137,407			108,718			103,108
Provision for credit losses	2,500			—			—			700
Net interest income after provision for credit losses	140,843			137,407			108,718			102,408
Non-interest income	9,479			8,502			5,545			6,242
Non-interest expense	(72,448		)	(72,916		)	(61,209		)	(54,033		)
Income from continuing operations before provision for income taxes	77,874			72,993			53,054			54,617
Income tax expense	19,348			17,133			13,579			14,234
Net income	58,526			55,860			39,475			40,383
Dividends on preferred stock	151			176			247			176
Net income available to common stockholders	$	58,375		$	55,684		$	39,228		$	40,207
Earnings per share:
Basic	$	0.58		$	0.55		$	0.44		$	0.46
Diluted	$	0.57		$	0.55		$	0.44		$	0.45

(1) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, prior period 2015 amounts have been adjusted.

	Year Ended December 31, 2014
	Fourth Quarter			Third Quarter			Second Quarter			First Quarter
	(in thousands, except per share amounts)
Interest income	$	110,151		$	105,554		$	101,973		$	98,701
Interest expense	8,006			7,481			8,075			7,924
Net interest income	102,145			98,073			93,898			90,777
Provision for credit losses	300			419			507			3,500
Net interest income after provision for credit losses	101,845			97,654			93,391			87,277
Non-interest income	8,417			6,073			5,599			4,562
Non-interest expense	(55,742		)	(49,859		)	(52,242		)	(49,476		)
Income from continuing operations before provision for income taxes	54,520			53,868			46,748			42,363
Income tax expense	14,111			12,949			10,706			10,624
Income from continuing operations	40,409			40,919			36,042			31,739
Loss from discontinued operations, net of tax	—			—			(504		)	(654		)
Net income	40,409			40,919			35,538			31,085
Dividends on preferred stock	329			353			352			353
Net income available to common stockholders	$	40,080		$	40,566		$	35,186		$	30,732
Earnings per share:
Basic	$	0.46		$	0.47		$	0.41		$	0.35
Diluted	$	0.46		$	0.46		$	0.40		$	0.35

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Nature of Operation

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division, with their results reported under the Company's Northern California operating segment.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equity Fund Resources, Life Sciences Group, Mortgage Warehouse Lending, Public Finance, Renewable Energy Group, Resort Finance, and Technology Finance. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of Presentation

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Consolidated Financial Statements.

Use of Estimates

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Consolidated Financial Statements.

Principles of Consolidation

Principles of consolidation

On December 31, 2013, the Company consolidated its three bank subsidiaries under one bank charter, WAB. As the subsidiary bank mergers did not meet the definition of a business combination under the guidance of ASC 805, Business Combinations, the entities were combined in a method similar to a pooling of interests.

As of December 31, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal and non-profit loans, and leases; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after distributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Reclassifications

Certain amounts in the Consolidated Financial Statements as of and for the years ended December 31, 2015, 2014, and 2013 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

Business Combinations

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment Securities

Investment securities

Investment securities may be classified as HTM, AFS, or measured at fair value. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs, or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading securities measured at fair value are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted Stock

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Bank also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists.

Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]

Loans, held for sale

Loans, held for sale consist primarily of SBA and CRE loans that the Company originates (or acquires) and intends to sell. These loans are carried at the lower of aggregate cost or fair value. Fair value is determined based on available market data for similar assets, expected cash flows, and appraisals of underlying collateral or the credit quality of the borrower. Gains and losses on the sale of loans are recognized pursuant to ASC 860, Transfers and Servicing. Interest income of these loans is accrued daily and loan origination fees and costs are deferred and included in the cost basis of the loan. The Company issues various representations and warranties associated with these loan sales. The Company has not experienced any losses as a result of these representations and warranties.

Loans, Interest and Fees from Loans

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Consolidated Financial Statements.

Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period. When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations, or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for Credit Losses

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

Other Assets Acquired Through Foreclosure

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

Derivative Financial Instruments

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where the host contract is measured at fair value, with changes in fair value reported in current earnings, or the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income Taxes

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence is considered, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit related to uncertain tax positions may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits from uncertain tax positions are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 15. Income Taxes" for further discussion on income taxes.

Off-Balance Sheet Instruments

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair Values of Financial Instruments

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income, and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who may purchase the asset or assume the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at December 31, 2015 and 2014. The estimated fair value amounts for December 31, 2015 and 2014 have been measured as of period-end, and have not been re-evaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 17. Fair Value Accounting" in these Notes to Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances and other borrowed funds

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

Recent Accounting Pronouncements

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In November 2015, the FASB issued guidance within ASU 2015-17, Income Taxes. The amendments in ASU 2015-17 to Topic 740, Income Taxes, changes the presentation of deferred income tax liabilities and assets, from previously bifurcated current and noncurrent, to a single noncurrent amount on the classified statement of financial position. The amendment is effective from the annual period ending after December 15, 2016, and for and interim periods within those annual periods. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In January 2016, the FASB issued guidance within ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 to Subtopic 825-10, Financial Instruments, contain the following elements: 1) require equity investments to be measured at fair value with changes in fair value recognized in net income; 2) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) eliminates the requirement for public entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in OCI the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or accompanying notes to the financial statements; 7) clarifies that the entity should evaluate the need for a valuation allowance on a deferred tax asset related to AFS securities in combination with the entity's other deferred tax assets. The amendments are effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Except for the early application of the amendment noted in item 5) above, early adoption of the amendments in this Update is not permitted. See discussion in Recently adopted accounting guidance below for further discussion of the Company's election to early adopt this element of ASU 2016-01.

Recently adopted accounting guidance

In January 2014, the FASB issued guidance within ASU 2014-04, Reclassification of Residential Real Estate CollateralizedConsumer Mortgage Loans upon Foreclosure. The objective of the amendments in ASU 2014-04 to Topic 310, Receivables - Troubled Debt Restructurings by Creditors, is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 31, 2014. An entity can elect to adopt the amendments using either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In June 2014, the FASB issued guidance within ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings,and Disclosures. The amendments in ASU 2014-11 to Topic 860, Transfers and Servicing, change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and, for repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. The accounting changes are effective for the first interim or annual period beginning after December 15, 2014. The amendments also require disclosure of information about certain transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the same counterparty. An entity will also be required to disclose information about repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014 and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.8 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs were not significant.

In the third quarter 2015, the Company elected early adoption of the amended guidance within ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. Under current GAAP, the acquirer is required to retrospectively adjust the provisional amounts recognized at the acquisition date with a corresponding adjustment to goodwill and is also required to revise comparative information for prior periods presented in the financial statements. The amendments in ASU 2015-16 to Topic 805, Business Combinations, require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this Update also require that the acquirer record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. An entity is required to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. As a result of the adoption of this amended guidance, all measurement period adjustments identified during the quarter have been recognized in the current reporting period. As the closing date of the Bridge acquisition was June 30, 2015, Bridge's results of operations were not included in the Company's results until July 1, 2015. Accordingly, there are no amounts recorded in current-period earnings that would have been recorded in previous reporting periods if the adjustments to the provisional amounts had been recognized as of the acquisition date. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the measurement period adjustments identified and recognized during the current reporting period.

In January 2016, and effective January 1, 2015, the Company elected early adoption of an element of ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which relates to the accounting for changes in the fair value of its own liabilities when the fair value option for financial instruments has been elected. As mentioned above, under this portion of this amended standard, the portion of the total change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value is presented separately in other comprehensive income rather than being recognized in the income statement at each reporting period. As the Company's junior subordinated debt are variable rate instruments, that fair value movement relates to credit risk and therefore the fair value adjustment qualifies for presentation in other comprehensive income. See "Note 10. Qualifying Debt" for additional detail on the impact that adoption has had on the current reporting period.

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Mergers, Acquisitions and Dispositions (Tables)

12 Months Ended

Dec. 31, 2015

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Year Ended December 31,
	2015		2014
	(in thousands, except per share amounts)
Interest income	$	560,292	$	495,235
Non-interest income	37,073		38,768
Net income available to common stockholders (1)	205,099		164,165
Earnings per share - basic	1.90		1.64
Earnings per share - diluted	1.87		1.62

(1) Excludes acquisition / restructure related costs incurred by the Company of $8.8 million for the year ended December 31, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $6.8 million for the year ended December 31, 2015, respectively, and related tax effects.

Business Combination Disclosure [Text Block]

The following table shows the recognized amounts of identifiable assets acquired and liabilities assumed at their as adjusted acquisition date fair values, which include all measurement period adjustments identified and recognized since July 1, 2015:

	As Adjusted
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,299
Investments in restricted stock	7,015
Loans	1,439,930
Premises and equipment	1,519
Other assets acquired through foreclosure	1,407
Bank owned life insurance	17,385
Investment in LIHTC	5,354
Intangible assets	14,997
Deferred tax assets, net	18,287
Other assets	19,993
Total assets	$	1,966,152
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	11,678
Total liabilities	1,764,996
Net assets acquired	$	201,156
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	266,413

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

The following table summarizes the operating results of the discontinued operations for the year ended December 31, 2014 and 2013: 

	Year Ended December 31,
	2014			2013
	(in thousands)
Operating revenue	$	(358	)	$	3,345
Non-interest expenses	(1,369		)	(4,855		)
Loss before income taxes	(1,727		)	(1,510		)
Income tax benefit	(569		)	(649		)
Net loss	$	(1,158	)	$	(861	)

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Investment Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities at December 31, 2015 and 2014 are summarized as follows: 

	December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,059	$	(49	)	$	10,060
Commercial MBS issued by GSEs	19,147		72		(105		)	19,114
Corporate debt securities	12,769		482		—			13,251
CRA investments	34,722		—		(37		)	34,685
Municipal obligations	320,087		14,743		—			334,830
Preferred stock	108,417		4,286		(1,467		)	111,236
Private label commercial MBS	4,685		6		—			4,691
Private label residential MBS	261,530		5		(4,407		)	257,128
Residential MBS issued by GSEs	1,169,631		5,254		(4,664		)	1,170,221
Trust preferred securities	32,000		—		(7,686		)	24,314
U.S. treasury securities	2,996		—		(3		)	2,993
Total AFS securities	$	1,966,034	$	34,907	$	(18,418	)	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs								$	1,481

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

Information pertaining to securities with gross unrealized losses at December 31, 2015 and 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	December 31, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	49	$	1	$	—	$	—	$	49	$	1
Commercial MBS issued by GSEs	105		17,051		—		—		105		17,051
CRA investments	37		24,729		—		—		37		24,729
Preferred stock	377		10,542		1,090		14,761		1,467		25,303
Private label residential MBS	3,733		226,720		674		30,372		4,407		257,092
Residential MBS issued by GSEs	3,566		536,515		1,098		38,338		4,664		574,853
Trust preferred securities	—		—		7,686		24,314		7,686		24,314
U.S. treasury securities	3		2,006		—		—		3		2,006
Total AFS securities	$	7,870	$	817,564	$	10,548	$	107,785	$	18,418	$	925,349

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

The amortized cost and fair value of securities as of December 31, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	December 31, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	62,852	$	63,114
After one year through five years	77,273		81,090
After five years through ten years	68,935		72,283
After ten years	301,981		314,882
Mortgage-backed securities	1,454,993		1,451,154
Total AFS securities	$	1,966,034	$	1,982,523

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position as of December 31, 2015 and 2014: 

	December 31, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,060	$	—	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		—		—		—		—		19,114
Corporate debt securities	—		—		2,721		5,489		5,041		—		—		13,251
CRA investments	—		—		—		—		—		—		34,685		34,685
Municipal obligations	7,949		—		180,460		131,110		6,243		180		8,888		334,830
Preferred stock	—		—		—		—		79,955		23,655		7,626		111,236
Private label commercial MBS	4,691		—		—		—		—		—		—		4,691
Private label residential MBS	235,605		—		40		3,186		1,750		2,705		13,842		257,128
Residential MBS issued by GSEs	—		1,170,221		—		—		—		—		—		1,170,221
Trust preferred securities	—		—		—		—		24,314		—		—		24,314
U.S. treasury securities	—		2,993		—		—		—		—		—		2,993
Total AFS securities (1)	$	248,245	$	1,192,328	$	183,221	$	139,785	$	117,303	$	36,600	$	65,041	$	1,982,523
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	—	$	—	$	—	$	—	$	1,481

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Gross Gains and (Losses) on Sales of Investment Securities

The following table presents gross gains and losses on sales of investment securities: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Gross gains	$	1,144		$	1,118		$	1,569
Gross losses	(529		)	(361		)	(2,764		)
Net gains on sales of investment securities	$	615		$	757		$	(1,195	)

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Loans, Leases and Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2015

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]

	As Adjusted
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal and interest payments:
PCI	$	17,899	$	3,127	$	—	$	2,509	$	—	$	23,535
Non-PCI	1,225,837		340,762		106,851		26,999		987		1,701,436
Total loans acquired	1,243,736		343,889		106,851		29,508		987		1,724,971
Cash flows expected to be collected:
PCI	10,066		1,570		—		2,088		—		13,724
Non-PCI	1,186,076		304,944		102,240		26,629		989		1,620,878
Total loans acquired	1,196,142		306,514		102,240		28,717		989		1,634,602
Fair value of loans acquired:
PCI	7,362		1,417		—		2,075		—		10,854
Non-PCI	1,076,742		229,306		99,080		23,023		925		1,429,076
Total loans acquired	$	1,084,104	$	230,723	$	99,080	$	25,098	$	925	$	1,439,930

Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses

The composition of the Company’s loan portfolio is as follows: 

	December 31,
	2015			2014
	(in thousands)
Loans, HFI
Commercial and industrial	$	5,114,257		$	3,326,708
Commercial real estate - non-owner occupied	2,283,536			2,052,566
Commercial real estate - owner occupied	2,083,285			1,732,888
Construction and land development	1,133,439			748,053
Residential real estate	322,939			299,402
Commercial leases	148,493			205,639
Consumer	26,905			33,009
Loans, net of deferred loan fees and costs	11,112,854			8,398,265
Allowance for credit losses	(119,068		)	(110,216		)
Total loans HFI	$	10,993,786		$	8,288,049

Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	December 31, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,078,968	$	445	$	362	$	3,510	$	4,317	$	2,083,285
Non-owner occupied	2,099,274		2,481		—		2,822		5,303		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	5,066,197		26,358		14,124		7,578		48,060		5,114,257
Leases	145,905		—		—		2,588		2,588		148,493
Construction and land development
Construction	694,527		—		—		—		—		694,527
Land	438,495		—		—		417		417		438,912
Residential real estate	317,677		888		159		4,215		5,262		322,939
Consumer	26,587		12		91		215		318		26,905
Total loans	$	11,046,589	$	30,184	$	14,736	$	21,345	$	66,265	$	11,112,854

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	December 31, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	749	$	3,253	$	4,002	$	339	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	11,851		2,822		14,673		—		30,226		8,601		38,827		2,171
Multi-family	—		—		—		—		—		—		—		—
Commercial and industrial
Commercial	3,263		15,026		18,289		2,671		2,621		496		3,117		703
Leases	—		2,588		2,588		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	1,892		417		2,309		—		2,686		2,640		5,326		805
Residential real estate	1,835		4,489		6,324		—		1,332		4,841		6,173		232
Consumer	—		196		196		18		25		188		213		83
Total	$	19,590	$	28,791	$	48,381	$	3,028	$	50,893	$	16,766	$	67,659	$	5,132

Loans by Risk Rating

The following tables present gross loans by risk rating: 

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,032,932	$	28,422	$	20,814	$	1,117	$	—	$	2,083,285
Non-owner occupied	2,054,428		14,867		35,282		—		—		2,104,577
Multi-family	178,959		—		—		—		—		178,959
Commercial and industrial
Commercial	4,962,930		76,283		74,294		750		—		5,114,257
Leases	140,531		4,580		794		2,588		—		148,493
Construction and land development
Construction	678,438		16,089		—		—		—		694,527
Land	420,819		362		17,731		—		—		438,912
Residential real estate	310,067		776		12,096		—		—		322,939
Consumer	26,438		209		258		—		—		26,905
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,799,558	$	140,932	$	104,232	$	1,867	$	—	$	11,046,589
Past due 30 - 59 days	1,907		271		28,006		—		—		30,184
Past due 60 - 89 days	4,077		385		10,274		—		—		14,736
Past due 90 days or more	—		—		18,757		2,588		—		21,345
Total	$	10,805,542	$	141,588	$	161,269	$	4,455	$	—	$	11,112,854

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

Recorded Investment in Loans Classified as Impaired

The table below reflects the recorded investment in loans classified as impaired: 

	December 31,
	2015			2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	24,287		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	104,587			41,822
Total impaired loans	$	128,874		$	166,750
Valuation allowance related to impaired loans (3)	$	(4,658	)	$	(10,765	)

(1) Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

(2) Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Average balance on impaired loans	$	150,151	$	169,758	$	182,670
Interest income recognized on impaired loans	4,794		5,494		6,235
Interest recognized on non-accrual loans, cash basis	1,634		2,536		1,916

Impaired Loans by Loan Class

The following table presents impaired loans by class: 

	December 31,
	2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	23,153	$	44,893
Non-owner occupied	41,081		66,324
Multi-family	—		—
Commercial and industrial
Commercial	26,513		13,749
Leases	2,896		373
Construction and land development
Construction	—		—
Land	18,322		21,748
Residential real estate	16,575		19,300
Consumer	334		363
Total	$	128,874	$	166,750

Average Investment in Impaired Loans by Loan Class

The following table presents average investment in impaired loans by loan class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	34,912	$	37,048	$	49,452
Non-owner occupied	56,360		68,821		56,110
Multi-family	—		—		89
Commercial and industrial
Commercial	17,534		16,168		15,023
Leases	2,948		410		727
Construction and land development
Construction	—		—		—
Land	19,561		21,580		27,326
Residential real estate	18,453		25,223		33,339
Consumer	383		508		604
Total	$	150,151	$	169,758	$	182,670

Interest Income on Impaired Loans by Loan Class

The following table presents interest income on impaired loans by class: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Commercial real estate
Owner occupied	$	1,575	$	1,550	$	1,726
Non-owner occupied	1,560		1,484		2,043
Multi-family	—		1		—
Commercial and industrial
Commercial	288		745		1,087
Leases	—		—		—
Construction and land development
Construction	—		—		—
Land	785		1,021		1,288
Residential real estate	579		646		62
Consumer	7		47		29
Total	$	4,794	$	5,494	$	6,235

Tabular Disclosure of Nonperforming Assets

The following table summarizes nonperforming assets: 

	December 31,
	2015		2014
	(in thousands)
Non-accrual loans (1)	$	48,381	$	67,659
Loans past due 90 days or more on accrual status	3,028		5,132
Troubled debt restructured loans (2)	70,707		84,720
Total nonperforming loans	122,116		157,511
Other assets acquired through foreclosure, net	43,942		57,150
Total nonperforming assets	$	166,058	$	214,661

(1) Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

(2) Includes accruing TDR loans only.

Accretable Yield Table

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Balance, at beginning of period	$	19,156		$	28,164		$	7,072
Additions due to acquisition of Bridge	857			—			—
Measurement period adjustments	38			—			22,318
Reclassifications from non-accretable to accretable yield (1)	1,747			6,052			9,817
Accretion to interest income	(3,996		)	(7,185		)	(7,182		)
Reversal of fair value adjustments upon disposition of loans	(1,877		)	(7,875		)	(3,861		)
Balance, at end of period	$	15,925		$	19,156		$	28,164

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowances for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Year Ended December 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			820			5,550			127			6,497
Recoveries	(1,872		)	(4,139		)	(2,181		)	(3,754		)	(203		)	(12,149		)
Provision	(1,454		)	(9,762		)	(3,539		)	18,411			(456		)	3,200
Ending balance	$	18,976		$	23,160		$	5,278		$	71,181		$	473		$	119,068
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	87			964			1,728			4,370			513			7,662
Recoveries	(2,160		)	(3,859		)	(1,896		)	(4,728		)	(459		)	(13,102		)
Provision	1,966			(6,176		)	(4,352		)	14,551			(1,263		)	4,726
Ending balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
2013
Beginning Balance	$	10,554		$	34,982		$	15,237		$	32,860		$	1,794		$	95,427
Charge-offs	1,538			8,648			5,922			4,000			1,371			21,479
Recoveries	(2,060		)	(2,758		)	(2,097		)	(5,037		)	(930		)	(12,882		)
Provision	3,443			2,972			228			5,760			817			13,220
Ending balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050

The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	18,230	$	914	$	—	$	—	$	21	$	24,287
Impaired loans with no allowance recorded	20,375		38,737		8,283		15,661		18,322		2,896		313		104,587
Total loans individually evaluated for impairment	23,153		41,081		26,513		16,575		18,322		2,896		334		128,874
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	15,198		62,205		2,445		2,992		—		—		—		82,840
Total recorded investment	$	2,083,285	$	2,283,536	$	5,114,257	$	322,939	$	1,133,439	$	148,493	$	26,905	$	11,112,854
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	2,778	$	2,344	$	19,233	$	969	$	—	$	—	$	21	$	25,345
Impaired loans with no allowance recorded	63,709		61,692		71,773		44,142		82,800		5,229		3,923		333,268
Total loans individually evaluated for impairment	66,487		64,036		91,006		45,111		82,800		5,229		3,944		358,613
Loans collectively evaluated for impairment	2,044,934		2,180,250		5,085,299		303,372		1,115,117		145,597		26,571		10,901,140
Loans acquired with deteriorated credit quality	20,227		88,181		7,820		3,536		—		—		—		119,764
Total unpaid principal balance	$	2,131,648	$	2,332,467	$	5,184,125	$	352,019	$	1,197,917	$	150,826	$	30,515	$	11,379,517
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	858	$	11	$	3,518	$	270	$	—	$	—	$	1	$	4,658
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	858		11		3,518		270		—		—		1		4,658
Loans collectively evaluated for impairment	10,953		11,302		65,806		5,008		18,976		1,857		472		114,374
Loans acquired with deteriorated credit quality	—		36		—		—		—		—		—		36
Total allowance for credit losses	$	11,811	$	11,349	$	69,324	$	5,278	$	18,976	$	1,857	$	473	$	119,068

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructured Loans by Loan Class

The following table presents information on the financial effects of TDR loans by class for the periods presented:

	Year Ended December 31, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	193		—		—		193		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	1	81		—		3		78		4
Consumer	—	—		—		—		—		—
Total	3	$	530	$	—	$	3	$	527	$	4

	Year Ended December 31, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	6	$	14,646	$	378	$	257	$	14,011	$	33
Non-owner occupied	5	16,976		—		60		16,916		15
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	6	2,655		—		—		2,655		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	2,687		—		47		2,640		—
Residential real estate	5	1,966		447		70		1,449		15
Consumer	—	—		—		—		—		—
Total	24	$	38,930	$	825	$	434	$	37,671	$	67

	Year Ended December 31, 2013
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	8	$	3,681	$	—	$	54	$	3,627	$	28
Non-owner occupied	5	10,735		1,030		63		9,642		14
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	13	4,809		—		19		4,790		11
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	2	286		—		—		286		1
Residential real estate	13	5,434		267		887		4,280		24
Consumer	2	74		—		5		69		3
Total	43	$	25,019	$	1,297	$	1,028	$	22,694	$	81

Troubled Debt Restructured Loans by Class for Which There was a Payment Default

The following table presents TDR loans by class for which there was a payment default during the period: 

	Year Ended December 31,
	2015			2014			2013
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395	3	$	2,506
Non-owner occupied	—	—		2	984		3	1,490
Multi-family	—	—		—	—		—	—
Commercial and industrial
Commercial	—	—		3	369		3	1,089
Leases	—	—		—	—		—	—
Construction and land development
Construction	1	137		—	—		—	—
Land	—	—		—	—		2	330
Residential real estate	3	1,047		1	202		4	955
Consumer	—	—		—	—		—	—
Total	4	$	1,184	8	$	1,950	15	$	6,370

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Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	December 31,
	2015			2014
	(in thousands)
Bank premises	$	83,431		$	82,494
Land and improvements	33,971			33,971
Furniture, fixtures, and equipment	40,025			51,320
Leasehold improvements	18,958			18,160
Construction in progress	1,999			848
Total	178,384			186,793
Accumulated depreciation and amortization	(59,849		)	(72,975		)
Premises and equipment, net	$	118,535		$	113,818

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

	(in thousands)
2016	$	8,547
2017	7,999
2018	7,536
2019	6,628
2020	4,986
Thereafter	8,879
Total future minimum rental payments	$	44,575

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Other Assets Acquired Through Foreclosure (Tables)

12 Months Ended

Dec. 31, 2015

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Changes in Other Assets Acquired Through Foreclosure

The following table represents the changes in other assets acquired through foreclosure: 

	Year Ended December 31,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,407			—			1,407
Transfers to other assets acquired through foreclosure, net	28,566			—			28,566
Proceeds from sale of other real estate owned and repossessed assets, net	(51,038		)	5,411			(45,627		)
Valuation adjustments, net	—			(182		)	(182		)
Gains, net (1)	2,628			—			2,628
Balance, end of period	$	52,984		$	(9,042	)	$	43,942
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	13,777			—			13,777
Proceeds from sale of other real estate owned and repossessed assets, net	(33,643		)	7,725			(25,918		)
Valuation adjustments, net	—			(294		)	(294		)
Gains, net (1)	2,866			—			2,866
Balance, end of period	$	71,421		$	(14,271	)	$	57,150
	2013
Balance, beginning of period	$	113,474		$	(36,227	)	$	77,247
Additions from acquisition of Centennial	5,622			—			5,622
Transfers to other assets acquired through foreclosure, net	24,911			—			24,911
Proceeds from sale of other real estate owned and repossessed assets, net	(61,510		)	18,268			(43,242		)
Valuation adjustments, net	—			(3,743		)	(3,743		)
Gains, net (1)	5,924			—			5,924
Balance, end of period	$	88,421		$	(21,702	)	$	66,719

(1) Includes net gains related to initial transfers to other assets of $0.9 million, $0.1 million, and $0.9 million during the years ended December 31, 2015, 2014, and 2013 respectively, pursuant to accounting guidance.

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Deposits (Tables)

12 Months Ended

Dec. 31, 2015

Deposit [Abstract]

Schedule Of Deposits Table [Text Block]

The table below summarizes deposits by type: 

	December 31,
	2015		2014
	(in thousands)
Non-interest-bearing demand	$	4,093,976	$	2,288,048
Interest-bearing demand	1,028,073		854,935
Savings and money market	5,296,921		3,869,699
Certificate of deposit ($250,000 or more)	1,569,525		1,339,238
Other time deposits	42,129		579,123
Total deposits	$	12,030,624	$	8,931,043

Scheduled Maturities Of Time Deposits Table [Text Block]

The summary of the contractual maturities for all time deposits as of December 31, 2015 is as follows: 

	December 31, 2015
	(in thousands)
2016	$	1,507,050
2017	88,184
2018	9,633
2019	3,552
2020	3,235
Total	$	1,611,654

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP		Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Unrealized gain on cash flow hedge			Total
	(in thousands)
Balance, December 31, 2012	$	8,065		$	—	$	—		$	144	$	17		$	8,226
Other comprehensive income before reclassifications	(30,503		)	—		—			—		(17		)	(30,520		)
Amounts reclassified from accumulated other comprehensive income	748			—		—			—		—			748
Net current-period other comprehensive (loss)	(29,755		)	—		—			—		(17		)	(29,772		)
Balance, December 31, 2013	$	(21,690	)	$	—	$	—		$	144	$	—		$	(21,546	)
Transfer of HTM securities to AFS	8,976			—		—			—		—			8,976
Other comprehensive income before reclassifications	29,683			—		—			—		—			29,683
Amounts reclassified from accumulated other comprehensive income	(474		)	—		—			—		—			(474		)
Net current-period other comprehensive income	38,185			—		—			—		—			38,185
Balance, December 31, 2014	$	16,495		$	—	$	—		$	144	$	—		$	16,639
Balance, January 1, 2015 (1)	16,495			—		16,309			144		—			32,948
Transfer of HTM securities to AFS	—			—		—			—		—			—
Other comprehensive income before reclassifications	(6,117		)	90		(4,276		)	—		—			(10,303		)
Amounts reclassified from accumulated other comprehensive income	(385		)	—		—			—		—			(385		)
Net current-period other comprehensive (loss) income	(6,502		)	90		(4,276		)	—		—			(10,688		)
Balance, December 31, 2015	$	9,993		$	90	$	12,033		$	144	$	—		$	22,260

Schedule of Reclassifications Out of Accumulated Other Comprehensive Income

The following table presents reclassifications out of accumulated other comprehensive income: 

	Year Ended December 31,
Income Statement Classification	2015			2014			2013
	(in thousands)
Gain (loss) on sales of investment securities, net	$	615		$	757		$	(1,195	)
Income tax (expense) benefit	(230		)	(283		)	447
Net of tax	$	385		$	474		$	(748	)

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Other Borrowings (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s borrowings as of December 31, 2015 and 2014: 

	December 31,
	2015		2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	150,000		96,987
Other short-term debt	—		58,182
Total short-term borrowings	$	150,000	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

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Qualifying Debt Junior Subordinated Debt Table (Tables)

12 Months Ended

Dec. 31, 2015

Junior Subordinated Debt Table [Abstract]

Schedule of Subordinated Borrowing [Table Text Block]

		December 31,
Name of Trust	Maturity	2015			2014
At fair value		(in thousands)
BankWest Nevada Capital Trust II	2033	$	15,464		$	15,464
Intermountain First Statutory Trust I	2034	10,310			10,310
First Independent Statutory Trust I	2035	7,217			7,217
WAL Trust No. 1	2036	20,619			20,619
WAL Statutory Trust No. 2	2037	5,155			5,155
WAL Statutory Trust No. 3	2037	7,732			7,732
Total contractual balance		66,497			66,497
FVO on junior subordinated debt		(19,569		)	(26,060		)
Junior subordinated debt, at fair value		$	46,928		$	40,437
At amortized cost
Bridge Capital Holdings Trust I	2035	$	12,372		$	—
Bridge Capital Holdings Trust II	2036	5,155			—
Total contractual balance		17,527			—
Purchase accounting adjustment, net of accretion (1)		(6,085		)	—
Junior subordinated debt, at amortized cost		$	11,442		$	—
Total junior subordinated debt		$	58,370		$	40,437

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Stockholders' Equity Schedule of Share-based Compensation Arrangements by Share-based Payment Award (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of option activity during the year ended December 31, 2015 is presented below: 

	December 31, 2015
	Shares		Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value
	(in thousands, except exercise price and contractual terms)
Outstanding options, beginning of period	217		$	9.70
Granted	—		—
Issued in acquisition of Bridge	213		22.02
Exercised	(182	)	10.62
Forfeited or expired	(24	)	23.89
Options outstanding, end of period	224		$	19.15	6.41	$	3,738
Options exercisable, end of period	94		$	11.72	3.67	$	2,278
Options expected to vest, end of period	97		$	24.49	8.38	$	1,691

Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]

A summary of the status of the Company’s unvested shares of restricted stock, including those issued in connection with the Bridge acquisition, and changes during the years then ended is presented below: 

	December 31,
	2015				2014
	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
	(in thousands, except per share amounts)
Balance, beginning of period	1,050		$	16.19	1,204		$	9.71
Granted	509		27.55		508		23.90
Issued in acquisition of Bridge	546		14.70		—		—
Vested	(528	)	13.02		(566	)	9.57
Forfeited	(85	)	21.63		(96	)	15.05
Balance, end of period	1,492		$	20.46	1,050		$	16.19

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

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Derivatives and Hedging (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	December 31, 2015						December 31, 2014						December 31, 2013
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,386	$	788
Total	800,478		3,569		64,785		647,703		7		57,820		294,997		2,386		788
Netting adjustments (1)	—		—		—		—		—		—		—		384		384
Net derivatives in the balance sheet	$	800,478	$	3,569	$	64,785	$	647,703	$	7	$	57,820	$	294,997	$	2,002	$	404

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Gain (Loss) on Derivative Instruments

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the years ended December 31, 2015, 2014, and 2013 which are recorded in unrealized (losses) gains on assets and liabilities measured at fair value, net in the income statement.

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Hedge of Fixed Rate Loans (a)
Loss on "pay fixed" swap	$	(6,965	)	$	(60,377	)	$	3,308
Gain on receive fixed rate loans	7,044			60,208			(3,317		)
Net ineffectiveness	$	79		$	(169	)	$	(9	)
Hedge of Fixed Rate Subordinated Debt (a)
Gain on "receive fixed" swap	$	3,569		$	—		$	—
Loss on subordinated debt	(3,569		)	—			—
Net ineffectiveness	$	—		$	—		$	—

Largest Exposure To Individual Counterparty

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	December 31,
	2015		2014		2013
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	3,569	$	7	$	2,378
Collateral posted by this counterparty	4,680		—		2,002
Derivative liability with this counterparty	—		—		346
Collateral pledged to this counterparty	1,340		—		—
Net exposure after netting adjustments and collateral	$	229	$	7	$	—

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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted EPS: 

	Year Ended December 31,
	2015		2014		2013
	(in thousands, except per share amounts)
Weighted average shares - basic	94,570		86,693		85,682
Dilutive effect of stock awards	649		813		859
Weighted average shares - diluted	95,219		87,506		86,541
Net income available to common stockholders	$	193,494	$	146,564	$	113,555
Earnings per share - basic	2.05		1.69		1.33
Earnings per share - diluted	2.03		1.67		1.31

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Income Taxes Provision Current & Deferred Table (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Expense Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2015		2014			2013
	(in thousands)
Current	$	61,040	$	55,572		$	43,547
Deferred	3,254		(7,182		)	(13,717		)
Total tax provision	$	64,294	$	48,390		$	29,830

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Income Taxes Reconciliation between Statutory Federal Income Tax Rate and Company's Effective Tax Rate (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Income tax at statutory rate	$	90,489		$	69,125		$	50,979
Increase (decrease) resulting from:
State income taxes, net of federal benefits	5,783			4,904			3,016
Bank owned life insurance	(1,365		)	(1,578		)	(1,683		)
Tax-exempt income	(20,226		)	(15,006		)	(7,308		)
Deferred tax asset valuation allowance	(2,290		)	(2,104		)	(2,391		)
Bargain purchase gain	—			—			(3,775		)
Low income housing tax credits	(5,223		)	(3,872		)	(2,105		)
Tax benefit related to Western Liberty acquisition	—			—			(3,738		)
Other, net	(2,874		)	(3,079		)	(3,165		)
Total tax provision	$	64,294		$	48,390		$	29,830

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Income Taxes Cumulative Tax Effects of Primary Difference (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2015			2014
	(in thousands)
Deferred tax assets:
Allowance for credit losses	$	47,431		$	42,038
Fair market value adjustment related to acquired loans	13,930			8,250
Stock-based compensation	12,069			4,749
Net operating loss carryovers	9,255			8,453
Tax credit carryovers	9,052			9,617
Startup costs and other amortization	4,771			5,113
Allowance for other assets acquired through foreclosure, net	4,280			7,343
Section 382 limited NUBILs	3,284			3,657
Other	13,686			8,188
Total gross deferred tax assets	117,758			97,408
Deferred tax asset valuation allowance	—			(2,290		)
Total deferred tax assets	117,758			95,118
Deferred tax liabilities:
Unrealized gain on debt instruments measured at fair value	(7,537		)	—
Deferred loan costs	(7,400		)	(6,041		)
Unrealized gain on AFS securities	(6,353		)	(9,949		)
Core deposit intangible	(6,093		)	(1,006		)
Premises and equipment	(2,039		)	(4,049		)
Unrealized gains on financial instruments measured at fair value	(1,000		)	(9,798		)
Other	(984		)	(1,589		)
Total deferred tax liabilities	(31,406		)	(32,432		)
Deferred tax assets, net	$	86,352		$	62,686

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Income Taxes Gross Activity of Unrecognized Tax Benefits Related to Uncertain Tax Positions (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Contingency [Line Items]

Summary of Income Tax Contingencies [Table Text Block]

	December 31,
	2015		2014
	(in thousands)
Beginning balance	$	—	$	—
Gross Increases
Tax positions in prior periods	1,038		—
Current period tax positions	—		—
Gross decreases
Tax positions in prior periods	—		—
Settlements	—		—
Lapse of statute of limitations	—		—
Ending balance	$	1,038	$	—

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	December 31,
	2015		2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $341,374 at December 31, 2015 and $232,863 at December 31, 2014	$	3,624,578	$	2,164,523
Credit card commitments and financial guarantees	57,966		42,038
Standby letters of credit, including unsecured letters of credit of $4,257 at December 31, 2015 and $5,166 at December 31, 2014	50,659		49,556
Total	$	3,733,203	$	2,256,117

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

			Amount of Commitment Expiration per Period
	Total Amounts Committed		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
	(in thousands)
Commitments to extend credit	$	3,624,578	$	1,588,558	$	1,401,293	$	267,284	$	367,443
Credit card commitments and financial guarantees	57,966		57,966		—		—		—
Standby letters of credit	50,659		42,749		5,749		2,161		—
Total	$	3,733,203	$	1,689,273	$	1,407,042	$	269,445	$	367,443

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Fair Value Accounting (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations

For the years ended December 31, 2015, 2014, and 2013 securities gains and losses from fair value changes were as follows:

	Changes in Fair Values for Items Measured at Fair Value Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings			Total Changes Included in OCI (1)
	(in thousands)
Year Ended December 31, 2015
Securities measured at fair value	$	(32	)	$	2	$	—		$	(30	)	$	—
Junior subordinated debt	(6,491		)	—		(2,151		)	(2,151		)	(4,276		)
Total	$	(6,523	)	$	2	$	(2,151	)	$	(2,181	)	$	(4,276	)
Year Ended December 31, 2014
Securities measured at fair value	$	(41	)	$	7	$	—		$	(34	)	$	—
Junior subordinated debt	1,421			—		(1,754		)	(333		)	—
Total	$	1,380		$	7	$	(1,754	)	$	(367	)	$	—
Year Ended December 31, 2013
Securities measured at fair value	$	(260	)	$	6	$	—		$	(254	)	$	—
Junior subordinated debt	(5,640		)	—		(1,823		)	(7,463		)	—
Total	$	(5,900	)	$	6	$	(1,823	)	$	(7,717	)	$	—

Fair Value of Assets and Liabilities

The fair value of assets and liabilities measured at fair value on a recurring basis was determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,481	$	—	$	1,481
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,060	$	10,060
Commercial MBS issued by GSEs	—		19,114		—		19,114
Corporate debt securities	—		13,251		—		13,251
CRA investments	34,685		—		—		34,685
Municipal obligations	—		334,830		—		334,830
Preferred stock	111,236		—		—		111,236
Private label commercial MBS	—		4,691		—		4,691
Private label residential MBS	—		257,128		—		257,128
Residential MBS issued by GSEs	—		1,170,221		—		1,170,221
Trust preferred securities	—		24,314		—		24,314
U.S. treasury securities	2,993		—		—		2,993
Total AFS securities	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Loans - HFS	$	—	$	23,809	$	—	$	23,809
Derivative assets (1)	—		3,569		—		3,569
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	46,928	$	46,928
Derivative liabilities (1)	—		64,785		—		64,785

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $64,184 and the net carrying value of subordinated debt includes a net negative value of $3,569 as of December 31, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis

For the years ended December 31, 2015, 2014, and 2013, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Beginning balance	$	(40,437	)	$	(41,858	)	$	(36,218	)
Transfers into Level 3	—			—			—
Total gains (losses) for the period
Included in earnings (1)	—			1,421			(5,640		)
Included in other comprehensive income (2)	$	(6,491	)	$	—		$	—
Ending balance	$	(46,928	)	$	(40,437	)	$	(41,858	)

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, total losses for 2015 are included in the other comprehensive income line, Unrealized gain (loss) on junior subordinated debt, which is net of tax. The above amount represents the gross loss from changes in fair value of junior subordinated debt.

	CDO Securities
	Year Ended December 31,
	2015			2014		2013
	(in thousands)
Beginning balance	$	11,445		$	—	$	—
Transfers into Level 3	—			6,243		—
Total gains (losses) for the period
Included in other comprehensive income (3)	(1,385		)	5,202		—
Ending balance	$	10,060		$	11,445	$	—

(3) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized gain (loss) on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of December 31, 2015 and 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	December 31, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	46,928	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,060		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

Assets Measured at Fair Value on Nonrecurring Basis

The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of December 31, 2015:
Impaired loans with specific valuation allowance	$	19,629	$	—	$	—	$	19,629
Impaired loans without specific valuation allowance (1)	66,754		—		—		66,754
Other assets acquired through foreclosure	43,942		—		—		43,942
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $37.8 million and $3.8 million as of December 31, 2015 and 2014, respectively.

Estimated Fair Value of Financial Instruments

The estimated fair value of the Company’s financial instruments is as follows: 

	December 31, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,982,523	$	148,914	$	1,823,549	$	10,060	$	1,982,523
Trading	1,481		—		1,481		—		1,481
Derivative assets	3,569		—		3,569		—		3,569
Loans, net	11,017,595		—		10,766,826		86,383		10,853,209
Accrued interest receivable	54,445		—		54,445		—		54,445
Financial liabilities:
Deposits	$	12,030,624	$	—	$	12,034,199	$	—	$	12,034,199
Customer repurchases	38,155		—		38,155		—		38,155
FHLB advances	150,000		—		150,000		—		150,000
Qualifying debt	210,328		—		—		207,437		207,437
Derivative liabilities	64,785		—		64,785		—		64,785
Accrued interest payable	13,626		—		13,626		—		13,626

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Qualifying debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

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Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Summary of Actual Capital Amount and Ratio

The actual capital amounts and ratios for the Company and the Bank are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
December 31, 2015
WAL	$	1,603,472	$	1,341,011	$	13,193,563	$	13,683,148	12.2	%	10.2	%	9.8	%	9.7	%
WAB	1,485,070		1,213,304		13,073,394		13,561,251		11.4		9.3		9.0		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

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Goodwill and Other Intangible Assets (Tables) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Goodwill and Intangible Assets Amortization Schedule [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following is a summary of the Company's acquired intangible assets:

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in thousands)
Subject to amortization:
Core deposit intangibles	$	40,804	$	25,438	$	15,366	$	26,157	$	23,468	$	2,689
	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Impairment		Net Carrying Amount		Gross Carrying Amount		Impairment		Net Carrying Amount
Not subject to amortization
Trade name	$	350	$	—	$	350	$	—	$	—	$	—

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Below is a summary of future estimated aggregate amortization expense:

	Year Ended December 31,
	(in thousands)
2016	$	2,788
2017	2,074
2018	1,594
2019	1,547
2020	1,494
Thereafter	5,869
Total	$	15,366

Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months

$ 2,788

Finite-Lived Intangible Assets, Amortization Expense, Year Two

2,074

Finite-Lived Intangible Assets, Amortization Expense, Year Three

1,594

Finite-Lived Intangible Assets, Amortization Expense, Year Four

1,547

Finite-Lived Intangible Assets, Amortization Expense, Year Five

1,494

Finite-Lived Intangible Assets, Amortization Expense, after Year Five

5,869

Other intangible assets, net

$ 15,716

$ 2,689

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Segments (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Operating Segment Information

The following is a summary of selected operating segment information for the years ended December 31, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	9.5		$	2.4		$	2.4		$	—		$	2,250.3		$	2,266.9
Loans, net of deferred loan fees and costs	2,811.7			1,737.2			1,761.9			1,188.4			3,597.9			39.6			11,136.7
Less: allowance for credit losses	(30.1		)	(18.6		)	(18.8		)	(12.7		)	(38.5		)	(0.4		)	(119.1		)
Total loans	2,781.6			1,718.6			1,743.1			1,175.7			3,559.4			39.2			11,017.6
Other assets acquired through foreclosure, net	8.4			20.8			—			0.3			—			14.4			43.9
Goodwill and other intangible assets, net	—			24.8			—			158.2			122.4			—			305.4
Other assets	43.9			62.3			15.7			16.1			28.4			474.9			641.3
Total assets	$	2,836.2		$	1,836.0		$	1,761.2		$	1,352.7		$	3,710.2		$	2,778.8		$	14,275.1
Liabilities:
Deposits	$	2,880.7		$	3,382.8		$	1,902.5		$	1,541.1		$	2,134.4		$	189.1		$	12,030.6
Borrowings and qualifying debt	—			—			—			—			—			360.3			360.3
Other liabilities	12.2			29.0			7.8			11.2			105.1			127.4			292.7
Total liabilities	2,892.9			3,411.8			1,910.3			1,552.3			2,239.5			676.8			12,683.6
Allocated equity:	309.2			244.4			191.3			293.2			428.6			124.8			1,591.5
Total liabilities and stockholders' equity	$	3,202.1		$	3,656.2		$	2,101.6		$	1,845.5		$	2,668.1		$	801.6		$	14,275.1
Excess funds provided (used)	365.9			1,820.2			340.4			492.8			(1,042.1		)	(1,977.2		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Borrowings and qualifying debt	—			—			—			—			—			430.7			430.7
Other liabilities	17.4			40.8			8.9			0.2			72.4			98.2			237.9
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2015:	(in thousands)
Net interest income (expense)	$	129,914		$	122,082		$	94,585		$	56,698		$	124,222		$	(34,925	)	$	492,576
Provision for (recovery of) credit losses	3,099			(6,887		)	152			3,038			3,917			(119		)	3,200
Net interest income (expense) after provision for credit losses	126,815			128,969			94,433			53,660			120,305			(34,806		)	489,376
Non-interest income	4,204			9,202			2,697			5,161			4,110			4,394			29,768
Non-interest expense	(59,917		)	(59,553		)	(47,549		)	(30,161		)	(45,831		)	(17,595		)	(260,606		)
Income (loss) from continuing operations before income taxes	71,102			78,618			49,581			28,660			78,584			(48,007		)	258,538
Income tax expense (benefit)	27,893			27,516			20,849			12,051			29,469			(53,484		)	64,294
Net income	$	43,209		$	51,102		$	28,732		$	16,609		$	49,115		$	5,477		$	194,244

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Year Ended December 31, 2014:	(in thousands)
Net interest income (expense)	$	112,128		$	117,508		$	91,090		$	9,133		$	71,010		$	(15,976	)	$	384,893
Provision for (recovery of) credit losses	2,083			(7,542		)	(1,638		)	—			11,365			458			4,726
Net interest income (expense) after provision for credit losses	110,045			125,050			92,728			9,133			59,645			(16,434		)	380,167
Non-interest income	3,586			8,944			3,917			184			1,742			6,278			24,651
Non-interest expense	(54,859		)	(59,683		)	(49,764		)	(3,857		)	(27,804		)	(11,352		)	(207,319		)
Income (loss) from continuing operations before income taxes	58,772			74,311			46,881			5,460			33,583			(21,508		)	197,499
Income tax expense (benefit)	23,053			26,009			19,711			2,296			12,594			(35,273		)	48,390
Income from continuing operations	35,719			48,302			27,170			3,164			20,989			13,765			149,109
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	35,719		$	48,302		$	27,170		$	3,164		$	20,989		$	12,607		$	147,951

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Employee Benefit Plan (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Funded Status [Table Text Block]

The following table reflects the accumulated benefit obligation and funded status of the SERP from the June 30, 2015 acquisition date through December 31, 2015.

	Six Months Ended December 31, 2015
	(in thousands)
Change in benefit obligation
Benefit obligation at acquisition	$	7,122
Service cost	334
Interest cost	202
Actuarial (gains)/losses	(147		)
Expected benefits paid	(67		)
Projected benefit obligation at end of year	$	7,444
Unfunded projected/accumulated benefit obligation	(7,444		)
Additional liability	$	—
Weighted average assumptions to determine benefit obligation
Discount rate	5.75		%
Rate of compensation increase	4.00		%

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit cost recognized from the acquisition date through December 31, 2015 and the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost during 2016 are as follows:

	2016			Six Months Ended December 31, 2015
	(in thousands)
Components of net periodic benefit cost
Service cost	$	596		$	334
Interest cost	426			202
Amortization of prior service cost	96			60
Amortization of actuarial (gains)/losses	(96		)	(18		)
Net periodic benefit cost	$	1,022		$	578
Other comprehensive income (cost)	$	—		$	42

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Related Parties (Tables)

12 Months Ended

Dec. 31, 2015

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

The following table summarizes the aggregate activity in such loans for the periods indicated:

	Year Ended December 31,
	2015			2014
	(in thousands)
Balance, beginning	$	70,570		$	30,783
New loans	10,678			35,341
Advances	18,614			23,559
Repayments and other	(25,481		)	(19,113		)
Balance, ending	$	74,381		$	70,570

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Parent Company (Tables)

12 Months Ended

Dec. 31, 2015

Parent Company Financial Information [Abstract]

Condensed Balance Sheet [Table Text Block]

Condensed Balance Sheets

	December 31,
	2015		2014
	(in thousands)
ASSETS:
Cash and cash equivalents	$	7,627	$	11,855
Money market investments	122		451
Investment securities - AFS	50,507		51,335
Investment in bank subsidiaries	1,522,245		987,882
Investment in non-bank subsidiaries	2,424		9,827
Loans, net of deferred loan fees and costs and allowance for credit losses	35,635		39,221
Other assets acquired through foreclosure, net	14,471		16,318
Other assets	19,378		9,912
Total assets	$	1,652,409	$	1,126,801
LIABILITIES AND STOCKHOLDERS' EQUITY:
Other borrowings	$	—	$	83,182
Qualifying debt	58,370		40,437
Accrued interest and other liabilities	2,537		2,254
Total liabilities	60,907		125,873
Total stockholders’ equity	1,591,502		1,000,928
Total liabilities and stockholders’ equity	$	1,652,409	$	1,126,801

Schedule Of Condensed Income Statement And Comprehensive Income Table [Text Block]

Condensed Income Statements

	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Income:
Dividends from subsidiaries	$	140,900	$	67,515	$	71,529
Interest income	4,593		4,381		2,847
Non-interest income	586		1,235		3,995
Total income	146,079		73,131		78,371
Expense:
Interest expense	6,671		8,776		10,833
Non-interest expense	11,397		10,348		32,001
Total expense	18,068		19,124		42,834
Income before income taxes and equity in undistributed earnings of subsidiaries	128,011		54,007		35,537
Income tax benefit	5,876		5,388		21,426
Income before equity in undistributed earnings of subsidiaries	133,887		59,395		56,963
Equity in undistributed earnings of subsidiaries	60,357		88,556		58,002
Net income	194,244		147,951		114,965
Dividends on preferred stock	750		1,387		1,410
Net income available to common stockholders	$	193,494	$	146,564	$	113,555

Condensed Cash Flow Statement [Table Text Block]

Condensed Statements of Cash Flows

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Cash flows from operating activities:
Net income	$	194,244		$	147,951		$	114,965
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net undistributed earnings of subsidiaries	(60,357		)	(88,556		)	(58,002		)
Excess tax benefit of stock-based compensation	(1,945		)	(4,194		)	(1,552		)
Junior subordinated debt change in fair value	—			(1,421		)	5,640
Loss on extinguishment of debt	—			502			1,387
Other operating activities, net	(4,734		)	(20,040		)	(4,011		)
Net cash provided by operating activities	127,208			34,242			58,427
Cash flows from investing activities:
Purchases of securities	—			(23,431		)	(2,044		)
Principal pay downs, calls, maturities, and sales proceeds of securities, net	2,358			8,376			6,767
Proceeds from sale of other repossessed assets, net	4,138			9,610			9,844
Capital contributions to subsidiaries	—			—			(40,000		)
Loans purchases, fundings, and principal collections, net	3,704			3,286			(35,979		)
Sale (purchase) of money market investments, net	330			2,181			(1,968		)
Sale (purchase) of premises, equipment, and other assets, net	—			617			(481		)
Net cash and cash equivalents (used) in acquisition (1)	(19,440		)	—			—
Net cash provided by (used in) investing activities	(8,910		)	639			(63,861		)
Cash flows from financing activities:
Proceeds from other borrowings, net	—			22,000			3,000
Excess tax benefit of stock-based compensation	1,945			4,194			1,552
Repayments on other borrowings	(83,444		)	(6,501		)	(10,887		)
Proceeds from issuance of common stock	28,288			13,746			—
Proceeds from exercise of stock options	1,935			8,294			4,595
Redemption of preferred stock	(70,500		)	(70,500		)	—
Cash dividends paid on preferred stock	(750		)	(1,387		)	(1,410		)
Net cash used in financing activities	(122,526		)	(30,154		)	(3,150		)
Net increase (decrease) in cash and cash equivalents	(4,228		)	4,727			(8,584		)
Cash and cash equivalents at beginning of year	11,855			7,128			15,712
Cash and cash equivalents at end of year	$	7,627		$	11,855		$	7,128
Supplemental disclosure:
Cash paid during the year for:
Interest	$	4,235		$	9,067		$	11,091
Income taxes	54,590			32,238			19,105
Non-cash investing and financing activity:
Change in unrealized gain on AFS securities, net of tax	1,199			2,031			2,450
Change in unrealized (loss) on TRUPS securities, net of tax	(4,276		)	—			—
Loan contributions to subsidiaries	183			2,663			—

(1) Cash acquired, less cash consideration paid of $36.5 million, resulted in a net $19.4 million use of cash and cash equivalents in the acquisition.

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Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data Disclosure [Abstract]

Condensed Financial Statements [Table Text Block]

23. QUARTERLY FINANCIAL DATA (UNAUDITED)

	Year Ended December 31, 2015
	Fourth Quarter			Third Quarter (1)			Second Quarter (1)			First Quarter (1)
	(in thousands, except share amounts)
Interest income	$	151,331		$	146,233		$	116,618		$	110,962
Interest expense	7,988			8,826			7,900			7,854
Net interest income	143,343			137,407			108,718			103,108
Provision for credit losses	2,500			—			—			700
Net interest income after provision for credit losses	140,843			137,407			108,718			102,408
Non-interest income	9,479			8,502			5,545			6,242
Non-interest expense	(72,448		)	(72,916		)	(61,209		)	(54,033		)
Income from continuing operations before provision for income taxes	77,874			72,993			53,054			54,617
Income tax expense	19,348			17,133			13,579			14,234
Net income	58,526			55,860			39,475			40,383
Dividends on preferred stock	151			176			247			176
Net income available to common stockholders	$	58,375		$	55,684		$	39,228		$	40,207
Earnings per share:
Basic	$	0.58		$	0.55		$	0.44		$	0.46
Diluted	$	0.57		$	0.55		$	0.44		$	0.45

(1) Due to the Company's election to early adopt an element of ASU 2016-01, changes in the fair value of junior subordinated debt are presented as part of OCI rather than earnings effective January 1, 2015. Accordingly, prior period 2015 amounts have been adjusted.

	Year Ended December 31, 2014
	Fourth Quarter			Third Quarter			Second Quarter			First Quarter
	(in thousands, except per share amounts)
Interest income	$	110,151		$	105,554		$	101,973		$	98,701
Interest expense	8,006			7,481			8,075			7,924
Net interest income	102,145			98,073			93,898			90,777
Provision for credit losses	300			419			507			3,500
Net interest income after provision for credit losses	101,845			97,654			93,391			87,277
Non-interest income	8,417			6,073			5,599			4,562
Non-interest expense	(55,742		)	(49,859		)	(52,242		)	(49,476		)
Income from continuing operations before provision for income taxes	54,520			53,868			46,748			42,363
Income tax expense	14,111			12,949			10,706			10,624
Income from continuing operations	40,409			40,919			36,042			31,739
Loss from discontinued operations, net of tax	—			—			(504		)	(654		)
Net income	40,409			40,919			35,538			31,085
Dividends on preferred stock	329			353			352			353
Net income available to common stockholders	$	40,080		$	40,566		$	35,186		$	30,732
Earnings per share:
Basic	$	0.46		$	0.47		$	0.41		$	0.35
Diluted	$	0.46		$	0.46		$	0.40		$	0.35

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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Subsidiary	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Significant Of Accounting Policies [Line Items]
Life Insurance, Corporate or Bank Owned, Amount | $	$ 361,700,000	$ 321,900,000
Proceeds from Issuance of Subordinated Long-term Debt | $	$ 150,000,000	$ 0	$ 0
Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries | Subsidiary	1
Number of wholly-owned subsidiaries | Subsidiary	10
Number Of Unconsolidated Subsidiaries | Subsidiary	8
Maximum period of internal loss allowance calculation model	10 years
Debt Issuance Cost | $	$ 1,800,000

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Mergers, Acquisitions and Dispositions - Summary of Operating Results of Discontinued Operations (Detail) $ / shares in Units, $ in Thousands		3 Months Ended				12 Months Ended
	Jun. 30, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss		$ 0	$ 0	$ (504)	$ (654)	$ 0	$ (1,158)	$ (861)
Acquisition / restructure expense						8,836	198	5,752
Assets		10,600,498				14,275,089	10,600,498
Deposits		8,931,043				12,030,624	8,931,043
Cash Acquired from Acquisition	$ 342,427					342,427	0	21,204
Business Combination, Acquired Receivables, Fair Value	1,439,930
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		40,437				58,370	40,437
PartnersFirst [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Affinity card revenue							(358)	3,345
Non-interest expenses							(1,369)	(4,855)
Loss before income taxes							(1,727)	(1,510)
Income tax benefit							(569)	(649)
Net loss							(1,158)	$ (861)
Bridge Capital Holdings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,742,031
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Repossessed Assets	1,407
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	420,354
Business Combination, Consideration Transferred, Liabilities Incurred	10,676
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 378,966
Business Acquisition Share Exchange Ratio	0.8145
Business Acquisition Cash Consideration Per Share | $ / shares	$ 2.39
Payments to Acquire Businesses, Gross	$ 36,539
Acquisition / restructure expense						6,814
Business Combination, Acquired Receivables, Fair Value	1,439,930
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust		0				17,527	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	61,299
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Stock Investment	7,015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance	17,385
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investment in Low Income Housing Tax Credits	5,354
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	$ 11,287	$ 0				$ 11,442	$ 0

XML

Mergers, Acquisitions and Dispositions Business Combination, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition / restructure expense	$ 8,836	$ 198	$ 5,752
Bridge Capital Holdings [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition / restructure expense	6,814
Business Acquisition, Pro Forma Interest Income	560,292	495,235
Business Acquisition, Pro Forma Non-Interest Income	37,073	38,768
Business Acquisition, Pro Forma Net Income (Loss)	$ 205,099	$ 164,165
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 1.90	$ 1.64
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 1.87	$ 1.62

XML

Mergers, Acquisitions and Dispositions Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Cash Payment for Vested Stock Options	$ 6,200
Business Combination, Acquisition Related Costs		$ 900
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	6,200	(6,085)	$ 0
Business Combination, Acquired Receivables, Fair Value	1,439,930
Interest Rate and Credit Marks on Acquired Loans		40,500	27,100
Non-cash liabilities acquired in acquisition		1,764,996	0	$ 421,987
Cash Acquired from Acquisition	342,427	$ 342,427	0	$ 21,204
Business Combination, Provisional Information, Initial Accounting Incomplete, Nature of Adjustments		6786
Goodwill		$ 289,638	$ 23,224
Defined Benefit Pension Plan, Liabilities	7,100
Common Stock, Shares, Issued		103,087,044	88,691,249
Bridge Capital Holdings [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	378,966
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	61,299
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Stock Investment	7,015
Business Combination, Acquired Receivables, Fair Value	1,439,930
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	1,519
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	14,997
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	18,287
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	19,993
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,966,152
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	11,678
Non-cash liabilities acquired in acquisition	1,764,996
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	201,156
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	420,354
Business Combination, Consideration Transferred, Liabilities Incurred	10,676
Payments to Acquire Businesses, Gross	36,539
Business Combination, Consideration Transferred	467,569
Goodwill		$ 266,413
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Repossessed Assets	1,407
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance	17,385
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investment in Low Income Housing Tax Credits	5,354
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,742,031
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	$ 11,287	$ 11,442	$ 0
Common Stock, Shares, Issued	12,451,240	12,451,240
Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	$ 1,084,104
Acquired Non-Purchased Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	1,429,076
Interest Rate and Credit Marks on Acquired Loans	26,000
Acquired Non-Purchased Credit Impaired Loans [Member] | Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	1,076,742
Receivables Acquired with Deteriorated Credit Quality [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	10,854
Interest Rate and Credit Marks on Acquired Loans	5,700
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	$ 7,362

XML

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($)		Dec. 31, 2015		Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		$ 1,966,034,000		$ 1,493,648,000
Securities available-for-sale, Gross Unrealized Gains		34,907,000		40,480,000
Securities available-for-sale, Gross Unrealized (Losses)		(18,418,000)		(13,891,000)
Securities available for sale Total, Estimated Fair Value		1,982,523,000		1,520,237,000
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost				18,701,000
Securities available-for-sale, Gross Unrealized Gains				0
Securities available-for-sale, Gross Unrealized (Losses)				(355,000)
Securities available for sale Total, Estimated Fair Value				18,346,000
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		2,996,000
Securities available-for-sale, Gross Unrealized Gains		0
Securities available-for-sale, Gross Unrealized (Losses)		(3,000)
Securities available for sale Total, Estimated Fair Value		2,993,000
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		12,769,000		52,773,000
Securities available-for-sale, Gross Unrealized Gains		482,000		717,000
Securities available-for-sale, Gross Unrealized (Losses)		0		(1,001,000)
Securities available for sale Total, Estimated Fair Value		13,251,000		52,489,000
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		320,087,000		285,398,000
Securities available-for-sale, Gross Unrealized Gains		14,743,000		13,688,000
Securities available-for-sale, Gross Unrealized (Losses)		0		(49,000)
Securities available for sale Total, Estimated Fair Value		334,830,000		299,037,000
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		108,417,000		83,192,000
Securities available-for-sale, Gross Unrealized Gains		4,286,000		2,099,000
Securities available-for-sale, Gross Unrealized (Losses)		(1,467,000)		(2,679,000)
Securities available for sale Total, Estimated Fair Value		111,236,000		82,612,000
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost				37,449,000
Securities available-for-sale, Gross Unrealized Gains				500,000
Securities available-for-sale, Gross Unrealized (Losses)				(247,000)
Securities available for sale Total, Estimated Fair Value				37,702,000
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		1,169,631,000		881,734,000
Securities available-for-sale, Gross Unrealized Gains		5,254,000		11,440,000
Securities available-for-sale, Gross Unrealized (Losses)		(4,664,000)		(1,985,000)
Securities available for sale Total, Estimated Fair Value		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		19,147,000		2,047,000
Securities available-for-sale, Gross Unrealized Gains		72,000		100,000
Securities available-for-sale, Gross Unrealized (Losses)		(105,000)		0
Securities available for sale Total, Estimated Fair Value		19,114,000		2,147,000
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		261,530,000		70,985,000
Securities available-for-sale, Gross Unrealized Gains		5,000		379,000
Securities available-for-sale, Gross Unrealized (Losses)		(4,407,000)		(1,121,000)
Securities available for sale Total, Estimated Fair Value		257,128,000		70,243,000
Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		4,685,000		5,017,000
Securities available-for-sale, Gross Unrealized Gains		6,000		132,000
Securities available-for-sale, Gross Unrealized (Losses)		0		0
Securities available for sale Total, Estimated Fair Value		4,691,000		5,149,000
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		32,000,000		32,000,000
Securities available-for-sale, Gross Unrealized Gains		0		0
Securities available-for-sale, Gross Unrealized (Losses)		(7,686,000)		(6,454,000)
Securities available for sale Total, Estimated Fair Value		24,314,000		25,546,000
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		34,722,000		24,302,000
Securities available-for-sale, Gross Unrealized Gains		0		30,000
Securities available-for-sale, Gross Unrealized (Losses)		(37,000)		0
Securities available for sale Total, Estimated Fair Value		34,685,000		24,332,000
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		50,000		50,000
Securities available-for-sale, Gross Unrealized Gains		10,059,000		11,395,000
Securities available-for-sale, Gross Unrealized (Losses)		(49,000)		0
Securities available for sale Total, Estimated Fair Value		10,060,000		11,445,000
AAA [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		248,245,000	[1]	73,261,000	[2]
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
AAA [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AAA [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AAA [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		7,949,000		8,168,000
AAA [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
AAA [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		235,605,000		59,944,000
AAA [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		4,691,000		5,149,000
AAA [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Split-rated AAA/AA Plus [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,192,328,000	[1]	911,682,000	[2]
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				18,346,000
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		2,993,000
Split-rated AAA/AA Plus [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
Split-rated AAA/AA Plus [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
Split-rated AAA/AA Plus [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		19,114,000		2,147,000
Split-rated AAA/AA Plus [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
AA Plus to AA- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		183,221,000	[1]	141,083,000	[2]
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AA Plus to AA- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		2,721,000
AA Plus to AA- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		180,460,000		138,256,000
AA Plus to AA- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
AA Plus to AA- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		40,000		68,000
AA Plus to AA- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				2,759,000
A Plus to A- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		139,785,000	[1]	155,164,000	[2]
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
A Plus to A- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
A Plus to A- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		5,489,000
A Plus to A- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		131,110,000		146,155,000
A Plus to A- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
A Plus to A- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		3,186,000		3,439,000
A Plus to A- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				5,570,000
BBB Plus to BBB- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		117,303,000	[1]	171,851,000	[2]
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BBB Plus to BBB- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		5,041,000
BBB Plus to BBB- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		6,243,000		6,263,000
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		79,955,000		54,585,000
BBB Plus to BBB- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			37,702,000
BBB Plus to BBB- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,750,000		3,595,000
BBB Plus to BBB- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		24,314,000		25,546,000
BBB Plus to BBB- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				44,160,000
BB Plus and below [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		36,600,000	[1]	32,469,000	[2]
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
BB Plus and below [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BB Plus and below [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BB Plus and below [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		180,000		195,000
BB Plus and below [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		23,655,000		17,632,000
BB Plus and below [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
BB Plus and below [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		2,705,000		3,197,000
BB Plus and below [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		10,060,000		11,445,000
BB Plus and below [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Corporate Credit Quality Indicator Unrated [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		65,041,000	[1]	34,727,000	[2]
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
Corporate Credit Quality Indicator Unrated [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		8,888,000		0
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		7,626,000		10,395,000
Corporate Credit Quality Indicator Unrated [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
Corporate Credit Quality Indicator Unrated [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		13,842,000		0
Corporate Credit Quality Indicator Unrated [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		34,685,000		24,332,000
Corporate Credit Quality Indicator Unrated [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Rated Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,982,523,000	[1]	1,520,237,000	[2]
Rated Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				18,346,000
Rated Securities [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		2,993,000
Rated Securities [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		13,251,000
Rated Securities [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		334,830,000		299,037,000
Rated Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		111,236,000		82,612,000
Rated Securities [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			37,702,000
Rated Securities [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Rated Securities [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		19,114,000		2,147,000
Rated Securities [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		257,128,000		70,243,000
Rated Securities [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		4,691,000		5,149,000
Rated Securities [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		24,314,000		25,546,000
Rated Securities [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		34,685,000		24,332,000
Rated Securities [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		$ 10,060,000		11,445,000
Rated Securities [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				$ 52,489,000

[1] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ

[2] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

[3] At least 80% of mutual funds are investment grade corporate debt securities.

XML

Investment Securities - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2015 USD ($) positions	Dec. 31, 2014 USD ($) positions
Investment Identifier [Line Items]
Amount of impairment losses reclassified out of accumulated other comprehensive income into earnings	$ 0	$ 0
Total number of securities in an unrealized loss position | positions		146	109
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 18,418,000	$ 13,891,000
Securities with carrying amounts were pledged		$ 830,700,000	$ 755,500,000

XML

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	$ 7,870	$ 1,002
Available-for-sale securities, Less Than Twelve Months, Fair Value	817,564	122,799
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	10,548	12,889
Available-for-sale securities, Twelve Months or Longer, Fair Value	107,785	229,480
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	18,418	13,891
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	925,349	352,279
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		0
Available-for-sale securities, Less Than Twelve Months, Fair Value		0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		355
Available-for-sale securities, Twelve Months or Longer, Fair Value		18,346
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		355
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		18,346
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		139
Available-for-sale securities, Less Than Twelve Months, Fair Value		9,860
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		862
Available-for-sale securities, Twelve Months or Longer, Fair Value		29,139
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		1,001
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		38,999
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	377	232
Available-for-sale securities, Less Than Twelve Months, Fair Value	10,542	13,811
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	1,090	2,447
Available-for-sale securities, Twelve Months or Longer, Fair Value	14,761	28,109
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,467	2,679
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	25,303	41,920
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		247
Available-for-sale securities, Less Than Twelve Months, Fair Value		25,855
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		0
Available-for-sale securities, Twelve Months or Longer, Fair Value		0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		247
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		25,855
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	3,566	227
Available-for-sale securities, Less Than Twelve Months, Fair Value	536,515	49,217
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	1,098	1,758
Available-for-sale securities, Twelve Months or Longer, Fair Value	38,338	97,296
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	4,664	1,985
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	574,853	146,513
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		0
Available-for-sale securities, Less Than Twelve Months, Fair Value		0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		49
Available-for-sale securities, Twelve Months or Longer, Fair Value		4,430
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		49
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		4,430
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	3,733	157
Available-for-sale securities, Less Than Twelve Months, Fair Value	226,720	24,056
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	674	964
Available-for-sale securities, Twelve Months or Longer, Fair Value	30,372	26,614
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	4,407	1,121
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	257,092	50,670
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0	0
Available-for-sale securities, Less Than Twelve Months, Fair Value	0	0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	7,686	6,454
Available-for-sale securities, Twelve Months or Longer, Fair Value	24,314	25,546
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	7,686	6,454
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	24,314	$ 25,546
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	37
Available-for-sale securities, Less Than Twelve Months, Fair Value	24,729
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	37
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	24,729
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	49
Available-for-sale securities, Less Than Twelve Months, Fair Value	1
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	49
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	1
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	105
Available-for-sale securities, Less Than Twelve Months, Fair Value	17,051
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	105
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	17,051
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	3
Available-for-sale securities, Less Than Twelve Months, Fair Value	2,006
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	3
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 2,006

XML

Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Due in one year or less, Amortized Cost	$ 62,852
Securities available for sale, After one year through five years, Amortized Cost	77,273
Securities available for sale, After five years through ten years, Amortized Cost	68,935
Securities available for sale, After ten years, Amortized Cost	301,981
Securities available for sale, Mortgage backed securities, Amortized Cost	1,454,993
Securities available for sale Total, Amortized Cost	1,966,034	$ 1,493,648
Securities available for sale, Due in one year or less, Estimated Fair Value	63,114
Securities available for sale, After one year through five years, Estimated Fair Value	81,090
Securities available for sale, After five years through ten years, Estimated Fair Value	72,283
Securities available for sale, After ten years, Estimated Fair Value	314,882
Securities available for sale, Mortgage backed securities, Estimated Fair Value	1,451,154
Securities available for sale Total, Estimated Fair Value	$ 1,982,523	$ 1,520,237

XML

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($)		Dec. 31, 2015		Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		$ 1,982,523,000		$ 1,520,237,000
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		334,830,000		299,037,000
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		19,114,000		2,147,000
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		257,128,000		70,243,000
Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		4,691,000		5,149,000
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				37,702,000
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				18,346,000
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		2,993,000
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		111,236,000		82,612,000
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		24,314,000		25,546,000
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		10,060,000		11,445,000
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		13,251,000		52,489,000
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		34,685,000		24,332,000
Rated Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,982,523,000	[1]	1,520,237,000	[2]
Rated Securities [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		334,830,000		299,037,000
Rated Securities [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Rated Securities [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		19,114,000		2,147,000
Rated Securities [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		257,128,000		70,243,000
Rated Securities [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		4,691,000		5,149,000
Rated Securities [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			37,702,000
Rated Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				18,346,000
Rated Securities [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		2,993,000
Rated Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		111,236,000		82,612,000
Rated Securities [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		24,314,000		25,546,000
Rated Securities [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		10,060,000		11,445,000
Rated Securities [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		13,251,000
Rated Securities [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		34,685,000		24,332,000
AAA [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		248,245,000	[1]	73,261,000	[2]
AAA [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		7,949,000		8,168,000
AAA [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		235,605,000		59,944,000
AAA [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		4,691,000		5,149,000
AAA [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
AAA [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
AAA [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
AAA [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,192,328,000	[1]	911,682,000	[2]
Split-rated AAA/AA Plus [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,170,221,000		891,189,000
Securities measured at fair value		1,481,000		1,858,000
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		19,114,000		2,147,000
Split-rated AAA/AA Plus [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				18,346,000
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		2,993,000
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		183,221,000	[1]	141,083,000	[2]
AA Plus to AA- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		180,460,000		138,256,000
AA Plus to AA- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		40,000		68,000
AA Plus to AA- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
AA Plus to AA- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		2,721,000
AA Plus to AA- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		139,785,000	[1]	155,164,000	[2]
A Plus to A- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		131,110,000		146,155,000
A Plus to A- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		3,186,000		3,439,000
A Plus to A- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
A Plus to A- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
A Plus to A- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		5,489,000
A Plus to A- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		117,303,000	[1]	171,851,000	[2]
BBB Plus to BBB- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		6,243,000		6,263,000
BBB Plus to BBB- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,750,000		3,595,000
BBB Plus to BBB- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			37,702,000
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		79,955,000		54,585,000
BBB Plus to BBB- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		24,314,000		25,546,000
BBB Plus to BBB- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		5,041,000
BBB Plus to BBB- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		36,600,000	[1]	32,469,000	[2]
BB Plus and below [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		180,000		195,000
BB Plus and below [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		2,705,000		3,197,000
BB Plus and below [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
BB Plus and below [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
BB Plus and below [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		23,655,000		17,632,000
BB Plus and below [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		10,060,000		11,445,000
BB Plus and below [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
BB Plus and below [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		65,041,000	[1]	34,727,000	[2]
Corporate Credit Quality Indicator Unrated [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		8,888,000		0
Corporate Credit Quality Indicator Unrated [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		13,842,000		0
Corporate Credit Quality Indicator Unrated [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	[3]			0
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014				0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		7,626,000		10,395,000
Corporate Credit Quality Indicator Unrated [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		$ 34,685,000		$ 24,332,000

[1] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ

[2] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

[3] At least 80% of mutual funds are investment grade corporate debt securities.

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Investment Securities - Investment Securities by Credit Rating Type Parenthetical (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	$ 1,982,523	$ 1,520,237
Minimum percentage of investment grade mutual funds		80.00%
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	$ 34,685	$ 24,332

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Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 1,144	$ 1,118	$ 1,569
Gross (losses)	(529)	(361)	(2,764)
Net (losses) gains	$ 615	$ 757	$ (1,195)

XML

Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Interest Rate and Credit Marks on Acquired Loans	$ 40,500	$ 27,100
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	23,809	0
Net deferred loan fees and costs	(19,200)	(12,500)
Loans, net of deferred loan fees and costs	11,112,854	8,398,265
Allowance for credit losses	(119,068)	(110,216)
Loans, net	10,993,786	8,288,049
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	5,114,257	3,326,708
Commercial Real Estate Non Owner Occupied Multi Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,283,536	2,052,566
Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,083,285	1,732,888
Allowance for credit losses	(11,811)	(12,454)
Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	1,133,439	748,053
Allowance for credit losses	(18,976)	(18,558)
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	322,939	299,402
Allowance for credit losses	(5,278)	(7,456)
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	148,493	205,639
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	26,905	33,009
Allowance for credit losses	$ (473)	$ (853)

XML

Loans, Leases and Allowance for Credit Losses - Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 11,046,589	$ 8,366,782
Total Past Due	66,265	31,483
Total	11,112,854	8,398,265
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,078,968	1,730,164
Total Past Due	4,317	2,724
Total	2,083,285	1,732,888
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,099,274	1,855,454
Total Past Due	5,303	14,487
Total	2,104,577	1,869,941
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	178,959	182,180
Total Past Due	0	445
Total	178,959	182,625
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	5,066,197	3,324,132
Total Past Due	48,060	2,576
Total	5,114,257	3,326,708
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	145,905	205,639
Total Past Due	2,588	0
Total	148,493	205,639
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	694,527	388,399
Total Past Due	0	0
Total	694,527	388,399
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	438,495	356,209
Total Past Due	417	3,445
Total	438,912	359,654
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	317,677	292,065
Total Past Due	5,262	7,337
Total	322,939	299,402
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	26,587	32,540
Total Past Due	318	469
Total	26,905	33,009
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30,184	7,842
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	445	1,406
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,481	2,389
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26,358	1,523
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	888	2,347
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12	177
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,736	6,867
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	362	180
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	3,361
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	445
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,124	15
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	2,640
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	159	205
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	91	21
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	21,345	16,774
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,510	1,138
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,822	8,737
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,578	1,038
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,588	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	417	805
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,215	4,785
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 215	$ 271

XML

Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 11,046,589	$ 8,366,782
Total Past Due		66,265	31,483
Total Non-accrual	[1]	48,381	67,659
Loans past due 90 days or more and still accruing		3,028	5,132
Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		19,590	50,893
Total Past Due		28,791	16,766
Total Non-accrual			67,659
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,078,968	1,730,164
Total Past Due		4,317	2,724
Loans past due 90 days or more and still accruing		339	1,138
Commercial real estate [Member] | Owner occupied [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		749	13,630
Total Past Due		3,253	0
Total Non-accrual		4,002	13,630
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,099,274	1,855,454
Total Past Due		5,303	14,487
Loans past due 90 days or more and still accruing		0	2,171
Commercial real estate [Member] | Non-owner occupied [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		11,851	30,226
Total Past Due		2,822	8,601
Total Non-accrual		14,673	38,827
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		178,959	182,180
Total Past Due		0	445
Loans past due 90 days or more and still accruing		0	0
Commercial real estate [Member] | Multi-family [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	0
Total Past Due		0	0
Total Non-accrual		0	0
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		5,066,197	3,324,132
Total Past Due		48,060	2,576
Loans past due 90 days or more and still accruing		2,671	703
Commercial and industrial [Member] | Commercial [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		3,263	2,621
Total Past Due		15,026	496
Total Non-accrual		18,289	3,117
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		145,905	205,639
Total Past Due		2,588	0
Loans past due 90 days or more and still accruing		0	0
Commercial and industrial [Member] | Leases [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	373
Total Past Due		2,588	0
Total Non-accrual		2,588	373
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		694,527	388,399
Total Past Due		0	0
Loans past due 90 days or more and still accruing		0	0
Construction and land development [Member] | Construction [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	0
Total Past Due		0	0
Total Non-accrual		0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		438,495	356,209
Total Past Due		417	3,445
Loans past due 90 days or more and still accruing		0	805
Construction and land development [Member] | Land [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		1,892	2,686
Total Past Due		417	2,640
Total Non-accrual		2,309	5,326
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		317,677	292,065
Total Past Due		5,262	7,337
Loans past due 90 days or more and still accruing		0	232
Residential real estate [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		1,835	1,332
Total Past Due		4,489	4,841
Total Non-accrual		6,324	6,173
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		26,587	32,540
Total Past Due		318	469
Loans past due 90 days or more and still accruing		18	83
Consumer [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	25
Total Past Due		196	188
Total Non-accrual		$ 196	$ 213

[1] Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

XML

Loans, Leases and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Line Items]
Receivable with Imputed Interest, Discount		$ (8,200)	$ (7,500)
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	48,381	67,659
Impaired Financing Receivable, Average Recorded Investment		150,151	169,758	$ 182,670
Aggregate carrying amount of impaired loans	[2]	24,287	124,928
Reduction in interest income due to nonaccrual loans		2,500	3,800	5,400
Loans And Loans Receivable Purchases		137,200	166,400
Financing Receivable, Significant Sales		102,200
Impaired loans with no allowance recorded	[3]	104,587	41,822
Impaired loans with an allowance recorded	[4]	4,658	10,765
Loans and Leases Receivable, Gain (Loss) on Sales, Net		500
Troubled Debt Restructured Loans [Member]
Leases [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		18,200	53,600
Impaired Financing Receivable, Average Recorded Investment		113,900	126,600	$ 141,800
Aggregate carrying amount of impaired loans		3,000	103,300
Loan commitments outstanding		100	1,200
Impaired loans with no allowance recorded		85,900	35,000
Impaired loans with an allowance recorded		300	8,900
Construction and land development [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		0	21,052
Loans And Loans Receivable Purchases		100
Impaired loans with no allowance recorded		18,322	696
Impaired loans with an allowance recorded		0	3,112
Commercial real estate [Member]
Leases [Line Items]
Loans And Loans Receivable Purchases		13,200
Residential real estate [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		914	19,300
Impaired loans with no allowance recorded		15,661	0
Impaired loans with an allowance recorded		270	1,052
Commercial and industrial [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		18,230	11,399
Loans And Loans Receivable Purchases		117,100
Impaired loans with no allowance recorded		8,283	2,350
Impaired loans with an allowance recorded		3,518	1,926
Consumer [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		21	175
Impaired loans with no allowance recorded		313	188
Impaired loans with an allowance recorded		1	$ 17
Leases [Member]
Leases [Line Items]
Loans And Loans Receivable Purchases		$ 6,800

[1] Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

[2] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[3] Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

[4] Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

XML

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 11,112,854,000	$ 8,398,265,000
Current	11,046,589,000	8,366,782,000
Financing Receivable, Recorded Investment, Past Due	66,265,000	31,483,000
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	322,939,000	299,402,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	26,905,000	33,009,000
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,083,285,000	1,732,888,000
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,104,577,000	1,869,941,000
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	178,959,000	182,625,000
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,114,257,000	3,326,708,000
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	148,493,000	205,639,000
Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	694,527,000	388,399,000
Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	438,912,000	359,654,000
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	10,805,542,000	8,143,813,000
Current	10,799,558,000	8,140,140,000
Pass [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	310,067,000	284,052,000
Pass [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	26,438,000	32,419,000
Pass [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,032,932,000	1,664,270,000
Pass [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,054,428,000	1,771,138,000
Pass [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	178,959,000	182,180,000
Pass [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,962,930,000	3,295,027,000
Pass [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	140,531,000	202,772,000
Pass [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	678,438,000	383,677,000
Pass [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	420,819,000	328,278,000
Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	141,588,000	97,505,000
Current	140,932,000	95,091,000
Watch [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	776,000	2,044,000
Watch [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	209,000	233,000
Watch [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	28,422,000	28,072,000
Watch [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	14,867,000	35,752,000
Watch [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Watch [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	76,283,000	14,380,000
Watch [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,580,000	2,494,000
Watch [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	16,089,000	4,241,000
Watch [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	362,000	10,289,000
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	161,269,000	155,028,000
Current	104,232,000	129,787,000
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	12,096,000	13,306,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	258,000	357,000
Substandard [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	20,814,000	39,222,000
Substandard [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	35,282,000	62,611,000
Substandard [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	445,000
Substandard [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	74,294,000	17,146,000
Substandard [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	794,000	373,000
Substandard [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	481,000
Substandard [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	17,731,000	21,087,000
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,455,000	1,919,000
Current	1,867,000	1,764,000
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,117,000	1,324,000
Doubtful [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	440,000
Doubtful [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	750,000	155,000
Doubtful [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,588,000	0
Doubtful [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Current	0	0
Loss [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	30,184,000	7,842,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,907,000	2,771,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	271,000	198,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	28,006,000	4,718,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	155,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	14,736,000	6,867,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	4,077,000	385,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	385,000	37,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	10,274,000	6,445,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	21,345,000	16,774,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	517,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	2,179,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	18,757,000	14,078,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,588,000	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0

XML

Loans, Leases and Allowance for Credit Losses - Recorded Investment in Loans Classified as Impaired (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Impaired loans with an allowance recorded	[1]	$ 24,287	$ 124,928
Impaired loans with no allowance recorded	[2]	104,587	41,822
Total impaired loans		128,874	166,750
Valuation allowance related to impaired loans	[3]	$ (4,658)	$ (10,765)

[1] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[2] Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

[3] Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

XML

Loans, Leases and Allowance for Credit Losses - Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 128,874	$ 166,750
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	16,575	19,300
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	334	363
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	23,153	44,893
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	41,081	66,324
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	0	0
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	26,513	13,749
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	26,513	13,749
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	2,896	373
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 18,322	$ 21,748

XML

Loans, Leases and Allowance for Credit Losses - Schedule of Average Investment in Impaired Loans and Income Recognized on Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Impaired Financing Receivable, Average Recorded Investment	$ 150,151	$ 169,758	$ 182,670
Interest income recognized on impaired loans	4,794	5,494	6,235
Interest recognized on nonaccrual loans, cash basis	$ 1,634	$ 2,536	$ 1,916

XML

Loans, Leases and Allowance for Credit Losses - Average Investment in Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 150,151	$ 169,758	$ 182,670
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	18,453	25,223	33,339
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	383	508	604
Troubled Debt Restructured Loans [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	113,900	126,600	141,800
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	34,912	37,048	49,452
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	56,360	68,821	56,110
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	0	0	89
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	17,534	16,168	15,023
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	2,948	410	727
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	0	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 19,561	$ 21,580	$ 27,326

XML

Loans, Leases and Allowance for Credit Losses - Interest Income on Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 4,794	$ 5,494	$ 6,235
Owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	1,575	1,550	1,726
Non-owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	1,560	1,484	2,043
Multi-family [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	1	0
Commercial [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	288	745	1,087
Leases [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0	0
Construction [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0	0
Land [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	785	1,021	1,288
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	579	646	62
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 7	$ 47	$ 29

XML

Loans, Leases and Allowance for Credit Losses - Tabular Disclosure of Nonperforming Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 48,381	$ 67,659
Loans past due 90 days or more on accrual status		3,028	5,132
Troubled debt restructured loans	[2]	70,707	84,720
Total nonperforming loans		122,116	157,511
Other assets acquired through foreclosure, net		43,942	57,150	$ 66,719	$ 77,247
Total nonperforming assets		166,058	214,661
Troubled Debt Restructured Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 18,200	$ 53,600

[1] Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

[2] Includes accruing TDR loans only.

XML

Loans, Leases and Allowance for Credit Losses - Changes in Accretable Discount for Loans Purchased with Credit Quality Deterioration (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions			$ 857	$ 0	$ 0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		$ 7,000
Balance at beginning of period			19,156	28,164	7,072
Reclassifications from non-accretable to accretable yield (1)	[1]		1,747	6,052	9,817
Accretion to interest income			(3,996)	(7,185)	(7,182)
Reversal of fair value adjustments upon disposition of loans			(1,877)	(7,875)	(3,861)
Balance at end of period			15,925	19,156	28,164
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets			$ 38	$ 0	$ 22,318

[1] The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

XML

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Beginning Balance				$ 110,216				$ 100,050	$ 110,216	$ 100,050	$ 95,427
Charge-offs									6,497	7,662	21,479
Recoveries									(12,149)	(13,102)	(12,882)
Provision for credit losses	$ 2,500	$ 0	$ 0	700	$ 300	$ 419	$ 507	3,500	3,200	4,726	13,220
Ending balance	119,068				110,216				119,068	110,216	100,050
Construction and land development [Member]
Valuation Allowance [Line Items]
Beginning Balance				18,558				14,519	18,558	14,519	10,554
Charge-offs									0	87	1,538
Recoveries									(1,872)	(2,160)	(2,060)
Provision for credit losses									(1,454)	1,966	3,443
Ending balance	18,976				18,558				18,976	18,558	14,519
Commercial real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance				28,783				32,064	28,783	32,064	34,982
Charge-offs									0	964	8,648
Recoveries									(4,139)	(3,859)	(2,758)
Provision for credit losses									(9,762)	(6,176)	2,972
Ending balance	23,160				28,783				23,160	28,783	32,064
Residential real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance				7,456				11,640	7,456	11,640	15,237
Charge-offs									820	1,728	5,922
Recoveries									(2,181)	(1,896)	(2,097)
Provision for credit losses									(3,539)	(4,352)	228
Ending balance	5,278				7,456				5,278	7,456	11,640
Commercial and industrial [Member]
Valuation Allowance [Line Items]
Beginning Balance				54,566				39,657	54,566	39,657	32,860
Charge-offs									5,550	4,370	4,000
Recoveries									(3,754)	(4,728)	(5,037)
Provision for credit losses									18,411	14,551	5,760
Ending balance	71,181				54,566				71,181	54,566	39,657
Consumer [Member]
Valuation Allowance [Line Items]
Beginning Balance				$ 853				$ 2,170	853	2,170	1,794
Charge-offs									127	513	1,371
Recoveries									(203)	(459)	(930)
Provision for credit losses									(456)	(1,263)	817
Ending balance	$ 473				$ 853				$ 473	$ 853	$ 2,170

XML

Loans, Leases and Allowance for Credit Losses - Summary of Impairment Method Information Related to Loans and Allowance for Credit Losses (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	[1]	$ 24,287	$ 124,928
Impaired loans with no allowance recorded	[2]	104,587	41,822
Total loans individually evaluated for impairment		128,874	166,750
Loans collectively evaluated for impairment		10,901,140	8,135,041
Impaired Financing Receivable, Recorded Investment		128,874	166,750
Total recorded investment		11,112,854	8,398,265
Impaired loans with an allowance recorded		25,345	134,791
Impaired loans with no allowance recorded		333,268	44,220
Total loans individually evaluated for impairment		358,613	179,011
Loans collectively evaluated for impairment		10,901,140	8,135,041
Total unpaid principal balance		11,379,517	8,451,849
Impaired loans with an allowance recorded	[3]	4,658	10,765
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		4,658	10,765
Loans collectively evaluated for impairment		114,374	99,188
Total loans held for investment		119,068	110,216
Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		2,778	28,024
Impaired loans with no allowance recorded		20,375	16,869
Total loans individually evaluated for impairment		23,153	44,893
Loans collectively evaluated for impairment		2,044,934	1,670,083
Total recorded investment		2,083,285	1,732,888
Impaired loans with an allowance recorded		2,778	31,292
Impaired loans with no allowance recorded		63,709	17,010
Total loans individually evaluated for impairment		66,487	48,302
Loans collectively evaluated for impairment		2,044,934	1,670,083
Total unpaid principal balance		2,131,648	1,742,658
Impaired loans with an allowance recorded		858	2,082
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		858	2,082
Loans collectively evaluated for impairment		10,953	10,198
Total loans held for investment		11,811	12,454
Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		2,344	44,937
Impaired loans with no allowance recorded		38,737	21,387
Total loans individually evaluated for impairment		41,081	66,324
Loans collectively evaluated for impairment		2,180,250	1,910,420
Total recorded investment		2,283,536	2,052,566
Impaired loans with an allowance recorded		2,344	45,853
Impaired loans with no allowance recorded		61,692	21,550
Total loans individually evaluated for impairment		64,036	67,403
Loans collectively evaluated for impairment		2,180,250	1,910,420
Total unpaid principal balance		2,332,467	2,086,758
Impaired loans with an allowance recorded		11	2,537
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		11	2,537
Loans collectively evaluated for impairment		11,302	13,734
Total loans held for investment		11,349	16,329
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		18,230	11,399
Impaired loans with no allowance recorded		8,283	2,350
Total loans individually evaluated for impairment		26,513	13,749
Loans collectively evaluated for impairment		5,085,299	3,312,629
Total recorded investment		5,114,257	3,326,708
Impaired loans with an allowance recorded		19,233	11,829
Impaired loans with no allowance recorded		71,773	4,104
Total loans individually evaluated for impairment		91,006	15,933
Loans collectively evaluated for impairment		5,085,299	3,312,629
Total unpaid principal balance		5,184,125	3,329,712
Impaired loans with an allowance recorded		3,518	1,926
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		3,518	1,926
Loans collectively evaluated for impairment		65,806	49,809
Total loans held for investment		69,324	51,766
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		914	19,300
Impaired loans with no allowance recorded		15,661	0
Total loans individually evaluated for impairment		16,575	19,300
Loans collectively evaluated for impairment		303,372	277,692
Total recorded investment		322,939	299,402
Impaired loans with an allowance recorded		969	24,420
Impaired loans with no allowance recorded		44,142	0
Total loans individually evaluated for impairment		45,111	24,420
Loans collectively evaluated for impairment		303,372	277,692
Total unpaid principal balance		352,019	305,551
Impaired loans with an allowance recorded		270	1,052
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		270	1,052
Loans collectively evaluated for impairment		5,008	6,404
Total loans held for investment		5,278	7,456
Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		0	21,052
Impaired loans with no allowance recorded		18,322	696
Total loans individually evaluated for impairment		18,322	21,748
Loans collectively evaluated for impairment		1,115,117	726,305
Total recorded investment		1,133,439	748,053
Impaired loans with an allowance recorded		0	21,169
Impaired loans with no allowance recorded		82,800	885
Total loans individually evaluated for impairment		82,800	22,054
Loans collectively evaluated for impairment		1,115,117	726,305
Total unpaid principal balance		1,197,917	748,359
Impaired loans with an allowance recorded		0	3,112
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		0	3,112
Loans collectively evaluated for impairment		18,976	15,446
Total loans held for investment		18,976	18,558
Commercial leases [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		0	41
Impaired loans with no allowance recorded		2,896	332
Total loans individually evaluated for impairment		2,896	373
Loans collectively evaluated for impairment		145,597	205,266
Total recorded investment		148,493	205,639
Impaired loans with an allowance recorded		0	41
Impaired loans with no allowance recorded		5,229	483
Total loans individually evaluated for impairment		5,229	524
Loans collectively evaluated for impairment		145,597	205,266
Total unpaid principal balance		150,826	205,790
Impaired loans with an allowance recorded		0	39
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		0	39
Loans collectively evaluated for impairment		1,857	2,761
Total loans held for investment		1,857	2,800
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		21	175
Impaired loans with no allowance recorded		313	188
Total loans individually evaluated for impairment		334	363
Loans collectively evaluated for impairment		26,571	32,646
Total recorded investment		26,905	33,009
Impaired loans with an allowance recorded		21	187
Impaired loans with no allowance recorded		3,923	188
Total loans individually evaluated for impairment		3,944	375
Loans collectively evaluated for impairment		26,571	32,646
Total unpaid principal balance		30,515	33,021
Impaired loans with an allowance recorded		1	17
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		1	17
Loans collectively evaluated for impairment		472	836
Total loans held for investment		473	853
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Loans acquired with deteriorated credit quality		119,764	137,797
Impaired loans with an allowance recorded		36	263
Receivables Acquired with Deteriorated Credit Quality [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		15,198	17,912
Loans acquired with deteriorated credit quality		20,227	24,273
Impaired loans with an allowance recorded		0	174
Receivables Acquired with Deteriorated Credit Quality [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		82,840	96,474
Receivables Acquired with Deteriorated Credit Quality [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		62,205	75,822
Loans acquired with deteriorated credit quality		88,181	108,935
Impaired loans with an allowance recorded		36	58
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		2,445	330
Loans acquired with deteriorated credit quality		7,820	1,150
Impaired loans with an allowance recorded		0	31
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		2,992	2,410
Loans acquired with deteriorated credit quality		3,536	3,439
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial leases [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		$ 0	$ 0

[1] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[2] Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

[3] Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

XML

Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Loan Class (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) SecurityLoan	Dec. 31, 2014 USD ($) SecurityLoan	Dec. 31, 2013 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	3	24	43
Pre-Modification Outstanding Recorded Investment	$ 530	$ 38,930	$ 25,019
Forgiven Principal Balance	0	825	1,297
Lost Interest Income	3	434	1,028
Post-Modification Outstanding Recorded Investment	527	37,671	22,694
Waived Fees and Other Expenses	$ 4	$ 67	$ 81
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	5	13
Pre-Modification Outstanding Recorded Investment	$ 81	$ 1,966	$ 5,434
Forgiven Principal Balance	0	447	267
Lost Interest Income	3	70	887
Post-Modification Outstanding Recorded Investment	78	1,449	4,280
Waived Fees and Other Expenses	$ 4	$ 15	$ 24
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 74
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	0	5
Post-Modification Outstanding Recorded Investment	0	0	69
Waived Fees and Other Expenses	$ 0	$ 0	$ 3
Owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	6	8
Pre-Modification Outstanding Recorded Investment	$ 0	$ 14,646	$ 3,681
Forgiven Principal Balance	0	378	0
Lost Interest Income	0	257	54
Post-Modification Outstanding Recorded Investment	0	14,011	3,627
Waived Fees and Other Expenses	$ 0	$ 33	$ 28
Non-owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	5	5
Pre-Modification Outstanding Recorded Investment	$ 193	$ 16,976	$ 10,735
Forgiven Principal Balance	0	0	1,030
Lost Interest Income	0	60	63
Post-Modification Outstanding Recorded Investment	193	16,916	9,642
Waived Fees and Other Expenses	$ 0	$ 15	$ 14
Multi-family [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0
Commercial [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	6	13
Pre-Modification Outstanding Recorded Investment	$ 256	$ 2,655	$ 4,809
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	0	19
Post-Modification Outstanding Recorded Investment	256	2,655	4,790
Waived Fees and Other Expenses	$ 0	$ 4	$ 11
Leases [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0
Construction [Member] | Construction and land development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0
Land [Member] | Construction and land development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	2	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 2,687	$ 286
Forgiven Principal Balance	0	0	0
Lost Interest Income	0	47	0
Post-Modification Outstanding Recorded Investment	0	2,640	286
Waived Fees and Other Expenses	$ 0	$ 0	$ 1

XML

Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Class for Which There was Payment Default (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) SecurityLoan	Dec. 31, 2014 USD ($) SecurityLoan	Dec. 31, 2013 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	4	8	15
Recorded Investment | $	$ 1,184	$ 1,950	$ 6,370
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	2	3
Recorded Investment | $	$ 0	$ 984	$ 1,490
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	2	3
Recorded Investment | $	$ 0	$ 395	$ 2,506
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	3	3
Recorded Investment | $	$ 0	$ 369	$ 1,089
Construction and land development [Member] | Land [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	2
Recorded Investment | $	$ 0	$ 0	$ 330
Construction and land development [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	0	0
Recorded Investment | $	$ 137	$ 0	$ 0
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	3	1	4
Recorded Investment | $	$ 1,047	$ 202	$ 955
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0

XML

Loans, Leases and Allowance for Credit Losses - Summary of Aggregate Activity in Loans (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finance Receivable Transferred To Held For Sale [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 48,381	$ 67,659
Impaired Financing Receivable, Average Recorded Investment		150,151	169,758	$ 182,670
Impaired loans with an allowance recorded	[2]	24,287	124,928
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		2,500	3,800	5,400
Impaired loans with no allowance recorded	[3]	104,587	41,822
Impaired loans with an allowance recorded	[4]	4,658	10,765
Loans And Loans Receivable Purchases		137,200	166,400
Financing Receivable, Significant Sales		102,200
Loans and Leases Receivable, Gain (Loss) on Sales, Net		500
Troubled Debt Restructured Loans [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Loan commitments outstanding		100	1,200
Financing Receivable, Recorded Investment, Nonaccrual Status		18,200	53,600
Impaired Financing Receivable, Average Recorded Investment		113,900	126,600	$ 141,800
Impaired loans with an allowance recorded		3,000	103,300
Impaired loans with no allowance recorded		85,900	35,000
Impaired loans with an allowance recorded		300	8,900
Commercial and industrial [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Impaired loans with an allowance recorded		18,230	11,399
Impaired loans with no allowance recorded		8,283	2,350
Impaired loans with an allowance recorded		3,518	1,926
Loans And Loans Receivable Purchases		117,100
Commercial real estate [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Loans And Loans Receivable Purchases		13,200
Commercial leases [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Impaired loans with an allowance recorded		0	41
Impaired loans with no allowance recorded		2,896	332
Impaired loans with an allowance recorded		0	39
Leases [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Loans And Loans Receivable Purchases		6,800
Construction and land development [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Impaired loans with an allowance recorded		0	21,052
Impaired loans with no allowance recorded		18,322	696
Impaired loans with an allowance recorded		0	$ 3,112
Loans And Loans Receivable Purchases		$ 100

[1] Includes non-accrual TDR loans of $18.2 million and $53.6 million at December 31, 2015 and 2014, respectively.

[2] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[3] Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

[4] Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

XML

Loans, Leases and Allowance for Credit Losses Acquired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	$ 7,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					$ 1,724,971
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					1,634,602
Business Combination, Acquired Receivables, Fair Value					1,439,930
Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets		$ 38	$ 0	$ 22,318
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					23,535
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					13,724
Business Combination, Acquired Receivables, Fair Value					10,854
Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					1,701,436
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					1,620,878
Business Combination, Acquired Receivables, Fair Value					1,429,076
Commercial and industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					1,243,736
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					1,196,142
Business Combination, Acquired Receivables, Fair Value					1,084,104
Commercial and industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					17,899
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					10,066
Business Combination, Acquired Receivables, Fair Value					7,362
Commercial and industrial [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					1,225,837
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					1,186,076
Business Combination, Acquired Receivables, Fair Value					1,076,742
Residential real estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					29,508
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					28,717
Business Combination, Acquired Receivables, Fair Value					25,098
Residential real estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					2,509
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					2,088
Business Combination, Acquired Receivables, Fair Value					2,075
Residential real estate [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					26,999
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					26,629
Business Combination, Acquired Receivables, Fair Value					23,023
Consumer [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					987
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					989
Business Combination, Acquired Receivables, Fair Value					925
Consumer [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					0
Business Combination, Acquired Receivables, Fair Value					0
Consumer [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					987
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					989
Business Combination, Acquired Receivables, Fair Value					925
Commercial real estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					343,889
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					306,514
Business Combination, Acquired Receivables, Fair Value					230,723
Commercial real estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					3,127
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					1,570
Business Combination, Acquired Receivables, Fair Value					1,417
Commercial real estate [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					340,762
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					304,944
Business Combination, Acquired Receivables, Fair Value					229,306
Construction and land development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					106,851
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					102,240
Business Combination, Acquired Receivables, Fair Value					99,080
Construction and land development [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					0
Business Combination, Acquired Receivables, Fair Value					0
Construction and land development [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					106,851
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					102,240
Business Combination, Acquired Receivables, Fair Value					$ 99,080

XML

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Operating Leases, Rent Expense, Net	$ 8,100	$ 6,200	$ 6,900
Buildings and Improvements, Gross	83,431	82,494
Operating Leases, Future Minimum Payments Due, Next Twelve Months	8,547
Operating Leases, Future Minimum Payments, Due in Two Years	7,999
Operating Leases, Future Minimum Payments, Due in Three Years	7,536
Operating Leases, Future Minimum Payments, Due in Four Years	6,628
Operating Leases, Future Minimum Payments, Due in Five Years	4,986
Operating Leases, Future Minimum Payments, Due Thereafter	8,879
Operating Leases, Future Minimum Payments Due	44,575
Land and Land Improvements	33,971	33,971
Furniture Fixtures And Equipment Gross	40,025	51,320
Leasehold Improvements, Gross	18,958	18,160
Construction in Progress, Gross	1,999	848
Property, Plant and Equipment, Gross	178,384	186,793
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(59,849)	(72,975)
Premises and equipment, net	118,535	113,818
Depreciation, Nonproduction	$ 7,700	$ 6,000	$ 6,000

XML

Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property	Dec. 31, 2013 USD ($)
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Assets Acquired through Foreclosure Additions Due to Business Acquisition	$ 1,407		$ 5,622
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 851	$ 100	900
Number of Real Estate Properties | Property	39	67
Balance, beginning of the period, Gross Balance	$ 71,421	$ 88,421	113,474
Transfers to other assets acquired through foreclosure, net, Gross Balance	28,566	13,777	24,911
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	(51,038)	(33,643)	(61,510)
Gains (losses), net, Gross Balance	2,628	2,866	5,924
Balance, end of period, Gross Balance	52,984	71,421	88,421
Balance, beginning of the period, Valuation Allowance	(14,271)	(21,702)	(36,227)
Proceeds from sale of other real estate owned and repossessed assets, net, Valuation Allowance	5,411	7,725	18,268
Valuation adjustments, net, Valuation Allowance	(182)	(294)	(3,743)
Balance, end of period, Valuation Allowance	(9,042)	(14,271)	(21,702)
Balance, beginning of the period, Net Balance	57,150	66,719	77,247
Transfers to other assets acquired through foreclosure, net, Net Balance	28,566	13,777	24,911
Proceeds from sale of other real estate owned and repossessed assets, net, Net Balance	(45,627)	(25,918)	(43,242)
Valuation adjustments of other repossessed assets, net	(182)	(294)	(3,743)
Gains (losses), net, Net Balance	2,628	2,866	5,924
Balance, end of period, Net Balance	$ 43,942	$ 57,150	$ 66,719

XML

Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure Parenthetical (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Assets Acquired through Foreclosure Additions Due to Business Acquisition	$ 1,407		$ 5,622
Transfers to other assets acquired through foreclosure, net	28,566	$ 13,777	24,911
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	(51,038)	(33,643)	(61,510)
Proceeds from Sale of Foreclosed Assets	(45,627)	(25,918)	(43,242)
Gains (losses), net, Gross Balance	2,628	2,866	5,924
Real Estate Owned, Valuation Allowance	(9,042)	(14,271)	(21,702)	$ (36,227)
Proceeds from sale of other real estate owned and repossessed assets, net, Valuation Allowance	5,411	7,725	18,268
Repossessed Assets	43,942	57,150	66,719	77,247
Foreclosed Assets Gross	52,984	71,421	88,421	$ 113,474
Valuation adjustments, net, Valuation Allowance	(182)	(294)	(3,743)
Valuation adjustments of other repossessed assets, net	(182)	(294)	(3,743)
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 851	$ 100	$ 900
Number of Real Estate Properties | Property	39	67

XML

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deposit [Abstract]
Certificates of Deposit, CDARS	$ 517,500	$ 700,700
Non-interest-bearing demand	4,093,976	2,288,048
Time Deposit Maturities, Next Twelve Months	1,507,050
Time Deposit Maturities, Year Two	88,184
Time Deposit Maturities, Year Three	9,633
Time Deposit Maturities, Year Four	3,552
Time Deposit Maturities, Year Five	3,235
Time Deposits	1,611,654
Interest Bearing Deposit Demand	1,028,073	854,935
Deposits, Savings Deposits	5,296,921	3,869,699
Time Deposits, $250,000 or more	1,569,525	1,339,238
Time Deposits, Less than $250,000	42,129	579,123
Deposits	12,030,624	8,931,043
Deposits, ICS	714,400	481,200
Deposits, Wholesale	184,200	257,000
Brokered Deposits, Regulatory	$ 365,600	$ 202,400

XML

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2015	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Comprehensive Income (Loss), after Adoption of New Accounting Principle				$ 32,948
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax			$ (17)		$ 17
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	$ 0	$ 0	(17)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	90	0	0
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976	0
Beginning balance	16,639	(21,546)	8,226
Other comprehensive income before reclassifications	(10,303)	29,683	(30,520)
Amounts reclassified from accumulated other comprehensive income	(385)	(474)	748
Net other comprehensive (loss) income	(10,688)	38,185	(29,772)
Ending balance	22,260	16,639	(21,546)
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Comprehensive Income (Loss), after Adoption of New Accounting Principle				16,495
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976
Beginning balance	16,495	(21,690)	8,065
Other comprehensive income before reclassifications	(6,117)	29,683	(30,503)
Amounts reclassified from accumulated other comprehensive income	(385)	(474)	748
Net other comprehensive (loss) income	(6,502)	38,185	(29,755)
Ending balance	9,993	16,495	(21,690)
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Comprehensive Income (Loss), after Adoption of New Accounting Principle				0
Beginning balance	0
Other comprehensive income before reclassifications	90
Amounts reclassified from accumulated other comprehensive income	0
Net other comprehensive (loss) income	90
Ending balance	90	0
Financial Liability Instruments, Fair Value Option [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income before reclassifications	(4,276)
Net other comprehensive (loss) income	(4,276)
Fair Value, Measurements, Recurring [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Comprehensive Income (Loss), after Adoption of New Accounting Principle				16,309
Ending balance	12,033
Impairment loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Comprehensive Income (Loss), after Adoption of New Accounting Principle				$ 144
Beginning balance	144	144	144
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive (loss) income	0	0
Ending balance	$ 144	$ 144	$ 144

XML

Other Borrowings - Company's Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Short Term
Revolving line of credit	$ 0	$ 25,000
FHLB advances	150,000	96,987
Other Long-term Debt, Current	0	58,182
Short-term Debt	150,000	180,169
Long Term
Long-term Debt	0	210,094
FHLB [Member]
Long Term
Long-term Debt	$ 0	$ 210,094

XML

Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ (230)	$ (283)
Amount reclassified from accumulated other comprehensive income	385	474	$ (748)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	385	474	(748)
Realized Gain Loss On Sale Of Investment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized gains on sales of investment securities	615	757	(1,195)
Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ (230)	$ (283)	$ 447

XML

Other Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt [Line Items]
Line of Credit Facility, Interest Rate at Period End		1.75%
Weighted average interest rate of FHLB and FRB Short-term advances	0.36%	1.24%
Other Long-term Debt, Current	$ 0	$ 58,182
Long-term Debt, Weighted Average Interest Rate		1.06%
Revolving line of credit	0	$ 25,000
Repayments of Debt	200,000
Gains (Losses) on Extinguishment of Debt	(81)	(502)	$ (1,387)
FHLB advances	150,000	96,987
Fed Funds With Other Institutions [Member]
Debt [Line Items]
Revolving line of credit	0	0
Secured borrowing credit line	100,000
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	1,210,000	1,150,000
Other Credit Facilities [Member]
Debt [Line Items]
Secured borrowing credit line	70,000
Secured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	25,000
Unsecured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	45,000
FHLB [Member]
Debt [Line Items]
Additional available credit with the entity	1,540,000	935,000
Long-term Debt	$ 0	$ 210,094

XML

Qualifying Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Qualifying Debt [Abstract]
Proceeds from Issuance of Subordinated Long-term Debt	$ 150,000,000	$ 0	$ 0

XML

Qualifying Debt Subordinated Debt Details (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subordinated Debt Details [Abstract]
Proceeds from Issuance of Subordinated Long-term Debt	$ 150,000,000	$ 0	$ 0
Debt Issuance Cost	1,800,000
Subordinated Debt	$ 152,000,000

XML

Qualifying Debt Junior Subordinated Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2015
Debt Instrument [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 46,928	$ 40,437
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	58,370	40,437
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	(6,085)	0		$ 6,200
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(6,523)	$ 1,380	$ (5,900)
Long-term Debt, Weighted Average Interest Rate		1.06%
Bridge Capital Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	12,372	$ 0
Bridge Capital Trust II [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 5,155	$ 0
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	2.95%	2.73%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 46,928	$ 40,437
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	66,497	66,497
Unrealized gain or loss on junior subordinated debt [Line Items]	(19,569)	(26,060)
Junior Subordinated Debt [Member] | BankWest Nevada Capital Trust II [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	15,464	15,464
Junior Subordinated Debt [Member] | Intermountain First Statutory Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	10,310	10,310
Junior Subordinated Debt [Member] | First Independent Capital Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	7,217	7,217
Junior Subordinated Debt [Member] | WAL Trust No. 1 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	20,619	20,619
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 2 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	5,155	5,155
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 3 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	7,732	7,732
Bridge Capital Holdings [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	17,527	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	11,442	0		$ 11,287
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (6,491)	$ 1,421	$ (5,640)

XML

Qualifying Debt Supplemental Schedule - Adoption of ASU 2016-01 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings	$ 22,260				$ 16,639				$ 22,260	$ 16,639	$ (21,546)	$ 8,226
Accumulated other comprehensive income	262,638				85,453				262,638	85,453
Non-interest income	9,479	$ 8,502	$ 5,545	$ 6,242	8,417	$ 6,073	$ 5,599	$ 4,562	29,768	24,651	22,197
Income Tax Expense (Benefit)	19,348	17,133	13,579	14,234	14,111	12,949	10,706	10,624	64,294	48,390	29,830
Net income (loss)	58,526	55,860	39,475	40,383	40,409	40,919	35,538	31,085	194,244	147,951	114,965
Net income available to common shareholders	$ 58,375	$ 55,684	$ 39,228	$ 40,207	$ 40,080	$ 40,566	$ 35,186	$ 30,732	$ 193,494	$ 146,564	$ 113,555
Earnings Per Share, Basic	$ 0.58	$ 0.55	$ 0.44	$ 0.46	$ 0.46	$ 0.47	$ 0.41	$ 0.35	$ 2.05	$ 1.69	$ 1.33
Earnings Per Share, Diluted	$ 0.57	$ 0.55	$ 0.44	$ 0.45	$ 0.46	$ 0.46	$ 0.40	$ 0.35	$ 2.03	$ 1.67	$ 1.31
Accounting Standards Update 2016-01 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings		$ 20,643	$ 15,348	$ 23,423
Accumulated other comprehensive income		218,897	159,939	125,467
Non-interest income		13,826	(2,191)	5,933
Income Tax Expense (Benefit)		19,183	10,599	14,118
Net income (loss)		59,134	34,719	40,190
Net income available to common shareholders		$ 58,958	$ 34,472	$ 40,014
Earnings Per Share, Basic		$ 590	$ 390	$ 460
Earnings Per Share, Diluted		$ 580	$ 390	$ 450
Accounting Standards Update 2016-01 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Retained earnings		$ 35,276	$ 26,707	$ 39,538
Accumulated other comprehensive income		204,264	148,580	109,352
Non-interest income		8,502	5,545	6,242
Income Tax Expense (Benefit)		17,133	13,579	14,234
Net income (loss)		55,860	39,475	40,383
Net income available to common shareholders		$ 55,684	$ 39,228	$ 40,207
Earnings Per Share, Basic		$ 0.55	$ 0.44	$ 0.46
Earnings Per Share, Diluted		$ 0.55	$ 0.44	$ 0.45

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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 18, 2015	Dec. 30, 2014	Sep. 27, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Value, Issued					$ 0	$ 0	$ 70,500,000				$ 141,000,000
Preferred Stock, Shares Issued					70,500	70,500	141,000			141,000,000	141,000,000
Preferred Stock, Par or Stated Value Per Share					$ 0.0001	$ 0.0001	$ 0.0001				$ 0.0001
Preferred Stock, Liquidation Preference Per Share					$ 1,000	$ 1,000	$ 1,000		$ 1,000		$ 1,000
Preferred Stock, Shares Outstanding						70,500	70,500
Preferred Stock, Redemption Amount							$ 70,700,000		$ 70,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options					$ 18,500,000	$ 18,500,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term						2 years 2 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 3,600,000	$ 7,100,000	$ 2,800,000
Common Stock, Shares, Issued					103,087,044	103,087,044	88,691,249
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						509,000	508,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number					1,492,000	1,492,000	1,050,000	1,204,000
Weighted Average Selling Price Per Share						$ 38.13
Proceeds from Issuance of Common Stock, Gross						$ 29,000,000
Stock Issued During Period, Value, New Issues						28,288,000	$ 13,746,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering Cost from Issuance of Common Stock						$ 700,000	$ 500,000
Stock Issued During Period, Shares, New Issues				760,376		760,000	548,122
Weighted Average Selling Price Per Share							$ 25.96
Stock Issued During Period, Value, New Issues							$ 14,200,000.0
Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Outstanding						71,000	70,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			285,000			308,400
Allocated Share-based Compensation Expense						$ 4,800,000	$ 3,600,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense						$ 9,300,000	$ 6,800,000
Bridge Capital Holdings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Acquisition Share Exchange Ratio		0.8145
Business Acquisition Cash Consideration Per Share		$ 2.39
Equity Award Conversion Ratio		0.905
Business Combination, Consideration Transferred, Liabilities Incurred		$ 10,676,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 2,400,000
Common Stock, Shares, Issued		12,451,240			12,451,240	12,451,240
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						546,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid		213,091
Stock Issued During Period, Value, New Issues	[1]					$ 431,031,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 420,354,000
Payments to Acquire Businesses, Gross		$ 36,539,000
Bridge Capital Holdings [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues						12,997,000
Stock Issued During Period, Value, New Issues	[1]					$ 1,000
Bridge Capital Holdings [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		0.00%
Business Combination, Consideration Transferred, Liabilities Incurred		$ 1,713,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		$ 4,100,000
Allocated Share-based Compensation Expense					$ 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		33.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		7 years 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 19.06
Bridge Capital Holdings [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred		$ 8,963,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		17,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		546,151
Allocated Share-based Compensation Expense					$ 1,700,000

[1] Includes value of certain share-based awards replaced in connection with the acquisition.

XML

Stockholders' Equity - Summary of Unvested Shares of Restricted Stock and Changes (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					509,000	508,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 27.55	$ 23.90
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number				1,492,000	1,492,000	1,050,000	1,204,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 20.46	$ 20.46	$ 16.19	$ 9.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					(528,000)	(566,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value					$ 13.02	$ 9.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period					(85,000)	(96,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value					$ 21.63	$ 15.05
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 12,600,000	$ 12,200,000	$ 6,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					$ 14.6	$ 13.3	$ 6.8
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Aggregate Intrinsic Value					12.6
Allocated Share-based Compensation Expense					$ 9.3	6.8
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		285,000			308,400
Allocated Share-based Compensation Expense					$ 4.8	3.6
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number				414,650	414,650
Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					52,200
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Aggregate Intrinsic Value					$ 1.4
Allocated Share-based Compensation Expense					$ 0.5	$ 0.0	$ 0.0
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues			760,376		760,000	548,122
Bridge Capital Holdings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					546,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 14.70	$ 0.00
Bridge Capital Holdings [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	546,151
Allocated Share-based Compensation Expense				$ 1.7
Bridge Capital Holdings [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues					12,997,000

XML

Stockholders' Equity Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		224	224	217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 19.15	$ 19.15	$ 9.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			6 years 4 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 3,738	$ 3,738
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 27.55	$ 23.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures			0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(182)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price			$ 10.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			(24)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price			$ 23.89
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		94	94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 11.72	$ 11.72
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			3 years 8 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 2,278	$ 2,278
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		97	97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 24.49	$ 24.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term			8 years 4 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		$ 1,691	$ 1,691
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense			$ 9,300	$ 6,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 12,600,000	$ 12,200,000	$ 6,700,000
Bridge Capital Holdings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 14.70	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures			213
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 22.02
Bridge Capital Holdings [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		1,700
Bridge Capital Holdings [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense		$ 500
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	33.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 19.06

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Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Notional Amount		$ 800,478	$ 647,703	$ 294,997
Derivative Asset, Fair Value		3,569	7	2,386
Derivative Liability, Fair Value		64,785	57,820	788
Notional Amount, Netting Adjustments	[1]	0	0	0
Derivative Netting Adjustments	[1]	0	0	384
Positive NPVs		3,569	7	2,002
Negative NPVs		64,785	57,820	404
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		800,478	647,703	294,997
Derivative Asset, Fair Value		3,569	7	2,386
Derivative Liability, Fair Value		$ 64,785	$ 57,820	$ 788

[1] Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

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Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 79	$ (169)	$ (9)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain (Loss) on Derivatives	(6,965)	(60,377)	3,308
Increase (Decrease) to Basis of Hedged Assets	7,044	60,208	(3,317)
Subordinated Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0	0	0
Subordinated Debt [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain (Loss) on Derivatives	3,569	0	0
Increase (Decrease) to Basis of Hedged Assets	$ (3,569)	$ 0	$ 0

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Derivatives and Hedging Largest Exposure to Individual Counterparty (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 3,569	$ 7	$ 2,002
Largest individual counterparty [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	3,569	7	2,378
Collateral posted by this counterparty	4,680	0	2,002
Negative derivative NPV with this counterparty	0	0	346
Collateral pledged to this counterparty	1,340	0	0
Net exposure after netting adjustments and collateral	$ 229	$ 7	$ 0

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Derivatives and Hedging Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 3,569	$ 7	$ 2,002
Negative NPVs	64,785	57,820	404
Collateral netted against derivative liabilities	61,700	57,800	300
Over collateralization net position	15,500	$ 14,200	$ 12,400
Additional collateral held in securities	$ 77,200

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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share									0	1,500	163,300
Basic									94,570,000	86,693,000	85,682,000
Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards									649,000	813,000	859,000
Diluted									95,219,000	87,506,000	86,541,000
Net income available to common shareholders	$ 58,375	$ 55,684	$ 39,228	$ 40,207	$ 40,080	$ 40,566	$ 35,186	$ 30,732	$ 193,494	$ 146,564	$ 113,555
Earnings (loss) per share - basic	$ 0.58	$ 0.55	$ 0.44	$ 0.46	$ 0.46	$ 0.47	$ 0.41	$ 0.35	$ 2.05	$ 1.69	$ 1.33
Earnings (loss) per share - diluted	$ 0.57	$ 0.55	$ 0.44	$ 0.45	$ 0.46	$ 0.46	$ 0.40	$ 0.35	$ 2.03	$ 1.67	$ 1.31

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Income Taxes Provision for Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Income Tax Expense (Benefit)									$ 61,040	$ 55,572	$ 43,547
Deferred Income Tax Expense (Benefit)									3,254	(7,182)	(13,717)
Income Tax Expense (Benefit)	$ 19,348	$ 17,133	$ 13,579	$ 14,234	$ 14,111	$ 12,949	$ 10,706	$ 10,624	$ 64,294	$ 48,390	$ 29,830

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Income Taxes Reconciliation between Statutory Federal Income Tax and Company's Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount									$ 90,489	$ 69,125	$ 50,979
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount									5,783	4,904	3,016
Increase Decrease In Bank Owned Life Insurance									(1,365)	(1,578)	(1,683)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount									(20,226)	(15,006)	(7,308)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									(2,290)	(2,104)	(2,391)
Income Tax Reconciliation Bargain Purchase Gain On Acquisition									0	0	(3,775)
Income Tax Reconciliation Low Income Housing And Other Tax Credits									(5,223)	(3,872)	(2,105)
Income Tax Reconciliation Tax Benefit Related to Acquisition									0	0	(3,738)
Income Tax Reconciliation Tax On Earnings Other Than Statutory Tax Rate									(2,874)	(3,079)	(3,165)
Income Tax Expense (Benefit)	$ 19,348	$ 17,133	$ 13,579	$ 14,234	$ 14,111	$ 12,949	$ 10,706	$ 10,624	$ 64,294	$ 48,390	$ 29,830
Effective Income Tax Rate Reconciliation, Percent									24.87%	24.50%	20.48%

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	24.87%	24.50%	20.48%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 700	$ 0
Decreased deferred tax assets net	23,700
Recognized net deferred tax asset	86,352	62,686
Operating Loss Carryforwards, Valuation Allowance	0	1,800
IRC Section 382 Limitation, Valuation Allowance	0	500
Western Liberty Bancorp [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward Annual Limitations on Deductions From Taxable Income	1,800
Centennial Bank [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward Annual Limitations on Deductions From Taxable Income	1,600
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 9,300	$ 8,500

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Income Taxes Income Taxes - Cumulative Tax Effects of Primary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 47,431	$ 42,038
Deferred Tax Assets Fair Market Value Adjustment Related to Acquired Loans	13,930	8,250
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	12,069	4,749
Deferred Tax Assets, Tax Credit Carryforwards	9,052	9,617
Deferred Tax Assets Start Up Costs and Other Amortization	4,771	5,113
Deferred Tax Assets Other Real Estate Owned Write Down	4,280	7,343
Deferred Tax Assets Net Unrealized Built In Losses	3,284	3,657
Deferred Tax Assets, Other	13,686	8,188
Deferred Tax Assets, Gross	117,758	97,408
Deferred Tax Assets, Valuation Allowance	0	(2,290)
IRC Section 382 Limitation, Valuation Allowance	0	500
Deferred Tax Assets, Net of Valuation Allowance	117,758	95,118
Deferred Tax Liabilities, Unrealized Gains on Debt Instruments Measured at Fair Value	7,537	0
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	(1,000)	(9,798)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	(7,400)	(6,041)
Deferred Tax Liabilities Unrealized Gains On Available For Sale Securities	(6,353)	(9,949)
Deferred Tax Liabilities, Core Deposit Intangible	(6,093)	(1,006)
Deferred Tax Liabilities, Property, Plant and Equipment	(2,039)	(4,049)
Deferred Tax Liabilities, Other	(984)	(1,589)
Deferred Tax Liabilities, Gross	(31,406)	(32,432)
Deferred tax assets, net	$ 86,352	$ 62,686

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Income Taxes - Low Income Housing Tax Credit (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Investment in Low Income Housing Tax Credit		$ 152.7	$ 126.6
Unfunded Low Income Housing Tax Credit Obligations		61.2	51.4
Amortization of Low Income Housing Tax Credits	$ 3.0	$ 14.4	$ 10.6	$ 5.9

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Income Taxes Gross Activity of Unrecognized Tax Benefits Related to Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 700	$ 0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	1,038
Unrecognized Tax Benefits	$ 1,038

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Income Taxes Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Investment in Low Income Housing Tax Credit		$ 152,700,000	$ 126,600,000
Unrecognized Tax Benefits, Income Tax Penalties Expense		0.1
Unrecognized Tax Benefits, Income Tax Penalties Accrued		0.1
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		0.1
Unfunded Low Income Housing Tax Credit Obligations		61,200,000	51,400,000
Amortization of Low Income Housing Tax Credits	$ 3,000,000	$ 14,400,000	$ 10,600,000	$ 5,900,000

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Percentage of first liens initial loan to value ratio		75.00%
Percent of commercial real estate loans owner occupied		48.00%	46.00%
Operating Leases, Rent Expense, Net		$ 8.1	$ 6.2	$ 6.9
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans		49.00%	54.00%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 3.3	$ 2.1

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Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Total amount	$ 3,733,203	$ 2,256,117
Operating Leases, Rent Expense, Net	$ 8,100	$ 6,200	$ 6,900
Percent of commercial real estate loans owner occupied	48.00%	46.00%
Unfunded Loan Commitment [Member]
Other Commitments [Line Items]
Loss Contingency Accrual	$ 3,300	$ 2,100
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	50,659	49,556
Unsecured Letters Of Credit	4,257	5,166
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	57,966	42,038
Commitments to extend credit [Member]
Other Commitments [Line Items]
Total amount	3,624,578	2,164,523
Unsecured Loan Commitments	$ 341,374	$ 232,863

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Commitments and Contingencies - Contractual Commitments for Lines and Letters of Credit by Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Total Amount Committed	$ 3,733,203	$ 2,256,117
Other Commitment, Due in Next Twelve Months	1,689,273
Other Commitment, Due in Second and Third Year	1,407,042
Other Commitment, Due in Fourth and Fifth Year	269,445
Other Commitment, Due after Fifth Year	367,443
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total Amount Committed	3,624,578	2,164,523
Other Commitment, Due in Next Twelve Months	1,588,558
Other Commitment, Due in Second and Third Year	1,401,293
Other Commitment, Due in Fourth and Fifth Year	267,284
Other Commitment, Due after Fifth Year	367,443
Credit card guarantees [Member]
Loss Contingencies [Line Items]
Total Amount Committed	57,966	42,038
Other Commitment, Due in Next Twelve Months	57,966
Other Commitment, Due in Second and Third Year	0
Other Commitment, Due in Fourth and Fifth Year	0
Other Commitment, Due after Fifth Year	0
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total Amount Committed	50,659	$ 49,556
Other Commitment, Due in Next Twelve Months	42,749
Other Commitment, Due in Second and Third Year	5,749
Other Commitment, Due in Fourth and Fifth Year	2,161
Other Commitment, Due after Fifth Year	$ 0

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Commitments and Contingencies Concentration of Lending Activities (Details)	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Percent of commercial real estate loans owner occupied	48.00%	46.00%

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Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (6,523)	$ 1,380	$ (5,900)
Interest Income on Securities	2	7	6
Interest Expense on Junior Subordinated Debt	(2,151)	(1,754)	(1,823)
Total Changes Included in Current-Period Earnings	(2,181)	(367)	(7,717)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	(4,276)
Securities measured at fair value [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(32)	(41)	(260)
Interest Income on Securities	2	7	6
Interest Expense on Junior Subordinated Debt	0	0	0
Total Changes Included in Current-Period Earnings	(30)	(34)	(254)
Junior Subordinated Debt [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(6,491)	1,421	(5,640)
Interest Income on Securities	0	0	0
Interest Expense on Junior Subordinated Debt	(2,151)	(1,754)	(1,823)
Total Changes Included in Current-Period Earnings	(2,151)	$ (333)	$ (7,463)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	$ (4,276)

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Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,982,523		$ 1,520,237
Derivative Liability	64,785		57,820		$ 404
Derivative Asset	3,569		7		$ 2,002
Subordinated Debt Obligations, Fair Value Disclosure	46,928		40,437
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,982,523		1,520,237
Loans Held-for-sale, Fair Value Disclosure	23,809
Derivative Liability	64,785	[1]	57,820	[2]
Derivative Asset	3,569	[1]	7	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	148,914		144,646
Loans Held-for-sale, Fair Value Disclosure	0
Derivative Liability	0	[1]	0	[2]
Derivative Asset	0	[1]	0	[2]
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,823,549		1,364,146
Loans Held-for-sale, Fair Value Disclosure	23,809
Derivative Liability	64,785	[1]	57,820	[2]
Derivative Asset	3,569	[1]	7	[2]
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,060		11,445
Loans Held-for-sale, Fair Value Disclosure	0
Derivative Liability	0	[1]	0	[2]
Derivative Asset	0	[1]	0	[2]
Subordinated Debt Obligations, Fair Value Disclosure	46,928		40,437
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	1,481		1,858
Securities available for sale	1,170,221		891,189
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	0		0
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	1,481		1,858
Securities available for sale	1,170,221		891,189
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	0		0
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	257,128		70,243
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	257,128		70,243
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	19,114		2,147
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	19,114		2,147
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	13,251		52,489
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	13,251		52,489
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	334,830		299,037
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	334,830		299,037
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	111,236		82,612
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	111,236		82,612
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			37,702
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			37,702
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			0
Fair Value, Measurements, Recurring [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	34,685
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	34,685		24,332
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,060		11,445
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,060		11,445
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	24,314		25,546
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	24,314		25,546
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,691		5,149
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,691		5,149
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			18,346
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			0
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			18,346
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			$ 0
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,993
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,993
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0

[1] Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $64,184 and the net carrying value of subordinated debt includes a net negative value of $3,569 as of December 31, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

[2] Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

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Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		$ (1,385)	$ 5,202	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	(6,243)	0
Other assets acquired through foreclosure, net		43,942	57,150	66,719	$ 77,247
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012		(6,523)	1,380	(5,900)
Junior subordinated debt		46,928	40,437
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,982,523	1,520,237
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure, net		43,900
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		1,982,523	1,520,237
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		46,928	40,437
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		$ 10,060	$ 11,445
Available-for-sale Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Valuation Technique		S&P Model	S&P Model
Junior subordinated debt, Significant Unobservable Inputs		Pricing indications from comparable securities	Pricing indications from comparable securities
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014		$ 10,060	$ 11,445
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		(10,060)	(11,445)	0	$ 0
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012		$ (6,491)	$ 1,421	(5,640)
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Input Value		5.674%	6.242%
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		$ 46,928	$ 40,437
Junior subordinated debt, Valuation Technique		Discounted cash flow	Discounted cash flow
Junior subordinated debt, Significant Unobservable Inputs		Implied credit rating of the Company	Adjusted Corporate Bond over Treasury Index with comparable credit spread
Junior Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance		$ (40,437)	$ (41,858)	(36,218)
Included in earnings (or changes in net assets)	[1]	0	1,421	(5,640)
Closing balance		(46,928)	(40,437)	(41,858)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		$ 0	$ 0	$ 0

[1] CDO Securities Year Ended December 31, 2015 2014 2013 (in thousands)Beginning balance $11,445 $— $—Transfers into Level 3 — 6,243 —Total gains (losses) for the period Included in other comprehensive income (3) (1,385) 5,202 —Ending balance $10,060 $11,445 $—

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Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	[1]	$ 24,287	$ 124,928
Impaired loans without specific valuation allowance	[2]	104,587	41,822
Other assets acquired through foreclosure		43,900	57,100
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		24,300	124,900
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		19,629	114,163
Impaired loans without specific valuation allowance	[3]	66,754	38,019
Other assets acquired through foreclosure		43,942	57,150
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		0	0
Impaired loans without specific valuation allowance	[3]	0	0
Other assets acquired through foreclosure		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		0	0
Impaired loans without specific valuation allowance	[3]	0	0
Other assets acquired through foreclosure		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		19,629	114,163
Impaired loans without specific valuation allowance	[3]	66,754	38,019
Other assets acquired through foreclosure		$ 43,942	$ 57,150

[1] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[2] Includes TDR loans of $85.9 million and $35.0 million at December 31, 2015 and 2014, respectively.

[3] Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy: Fair Value Measurements at the End of the Reporting Period Using Total Quoted Prices in Active Markets for Identical Assets(Level 1) Active Markets for Similar Assets(Level 2) Unobservable Inputs(Level 3) (in thousands)As of December 31, 2015: Impaired loans with specific valuation allowance $19,629 $— $— $19,629Impaired loans without specific valuation allowance (1) 66,754 — — 66,754Other assets acquired through foreclosure 43,942 — — 43,942As of December 31, 2014: Impaired loans with specific valuation allowance $114,163 $— $— $114,163Impaired loans without specific valuation allowance (1) 38,019 — — 38,019Other assets acquired through foreclosure 57,150 — — 57,150(1)Excludes loan balances with charge-offs of $37.8 million and $3.8 million as of December 31, 2015 and 2014, respectively.

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Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Financial assets
Securities available for sale	$ 1,982,523		$ 1,520,237
Securities measured at fair value	1,481		1,858
Derivative Asset	3,569		7		$ 2,002
Loans, net	10,993,786		8,288,049
Financial liabilities
Deposits	12,030,624		8,931,043
Customer repurchases	38,155		54,899
FHLB and FRB advances	150,000		96,987
Junior subordinated debt	46,928		40,437
Derivative Liability	64,785		57,820		$ 404
Fair Value, Measurements, Recurring [Member]
Financial assets
Securities available for sale	1,982,523		1,520,237
Derivative Asset	3,569	[1]	7	[2]
Financial liabilities
Derivative Liability	64,785	[1]	57,820	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Financial assets
Securities available for sale	148,914		144,646
Derivative Asset	0	[1]	0	[2]
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	0	[1]	0	[2]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets
Securities available for sale	1,823,549		1,364,146
Derivative Asset	3,569	[1]	7	[2]
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	64,785	[1]	57,820	[2]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Financial assets
Securities available for sale	10,060		11,445
Derivative Asset	0	[1]	0	[2]
Financial liabilities
Junior subordinated debt	46,928		40,437
Derivative Liability	0	[1]	0	[2]
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Financial assets
Securities available for sale	1,982,523		1,520,237
Securities measured at fair value	1,481		1,858
Derivative Asset	3,569		7
Loans, net	11,017,595		8,288,049
Accrued Investment Income Receivable	54,445		36,705
Financial liabilities
Deposits	12,030,624		8,931,043
Customer repurchases	38,155		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	150,000		307,081
Other borrowed funds			83,182
Junior subordinated debt	210,328		40,437
Derivative Liability	64,785		57,820
Interest Payable, Current	13,626		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Financial assets
Securities available for sale	1,982,523		1,520,237
Securities measured at fair value	1,481		1,858
Derivative Asset	3,569		7
Loans, net	10,853,209		8,136,874
Accrued Investment Income Receivable	54,445		36,705
Financial liabilities
Deposits	12,034,199		8,935,566
Customer repurchases	38,155		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	150,000		307,081
Other borrowed funds			86,074
Junior subordinated debt	207,437		40,437
Derivative Liability	64,785		57,820
Interest Payable, Current	13,626		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Financial assets
Securities available for sale	148,914		144,646
Securities measured at fair value	0		0
Derivative Asset	0		0
Loans, net	0		0
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Customer repurchases	0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0		0
Other borrowed funds			0
Junior subordinated debt	0		0
Derivative Liability	0		0
Interest Payable, Current	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]
Financial assets
Securities available for sale	1,823,549		1,364,146
Securities measured at fair value	1,481		1,858
Derivative Asset	3,569		7
Loans, net	10,766,826		7,984,692
Accrued Investment Income Receivable	54,445		36,705
Financial liabilities
Deposits	12,034,199		8,935,566
Customer repurchases	38,155		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	150,000		307,081
Other borrowed funds			25,000
Junior subordinated debt	0		0
Derivative Liability	64,785		57,820
Interest Payable, Current	13,626		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]
Financial assets
Securities available for sale	10,060		11,445
Securities measured at fair value	0		0
Derivative Asset	0		0
Loans, net	86,383		152,182
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Customer repurchases	0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0		0
Other borrowed funds			61,074
Junior subordinated debt	207,437		40,437
Derivative Liability	0		0
Interest Payable, Current	$ 0		$ 0

[1] Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $64,184 and the net carrying value of subordinated debt includes a net negative value of $3,569 as of December 31, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

[2] Derivative assets and liabilities relate to interest rate swaps, see "Note 13. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

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Fair Value Accounting - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions		3 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans	[1]		$ 24,287	$ 124,928
Impaired loans with an allowance recorded	[2]		(4,658)	(10,765)
Repossessed Assets			43,942	57,150	$ 66,719	$ 77,247
Other assets acquired through foreclosure			43,900	57,100
Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities contained credit losses		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans			24,300	124,900
Impaired loans with an allowance recorded			$ (4,700)	$ (10,800)
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Input Value			5.674%	6.242%
Period of basis point spread			5.06%	5.99%
Percentage of LIBOR			0.613%	0.256%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans			$ 19,629	$ 114,163
Repossessed Assets			43,900
Other assets acquired through foreclosure			43,942	57,150
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans			19,629	114,163
Other assets acquired through foreclosure			$ 43,942	$ 57,150

[1] Includes TDR loans of $3.0 million and $103.3 million at December 31, 2015 and 2014, respectively.

[2] Includes valuation allowance related to TDR loans of $0.3 million and $8.9 million at December 31, 2015 and 2014, respectively.

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Regulatory Capital Requirements - Summary of Actual Capital Amount and Ratio (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Tier 1 Capital Ratio	6.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier One Required To Be Well Capitalized	6.50%
Tier 1 Leverage Ratio	4.00%	4.00%
Common Equity Tier One Required For Capital Adequacy	4.50%
Consolidated Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital	$ 1,603,472	$ 1,119,618
Tier 1 Capital	1,341,011	1,007,278
Risk-Weighted Assets	13,193,563	9,555,390
Tangible Average Assets	$ 13,683,148	$ 10,367,575
Capital to Risk Weighted Assets	12.20%	11.70%
Tier One Risk Based Capital to Risk Weighted Assets	10.20%	10.50%
Tier One Leverage Capital to Average Assets	9.80%	9.70%
Common Equity Tier One Risk-Based Capital Ratio	9.70%
Western Alliance Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital	$ 1,485,070	$ 1,057,253
Tier 1 Capital	1,213,304	945,687
Risk-Weighted Assets	13,073,394	9,435,459
Tangible Average Assets	$ 13,561,251	$ 10,232,297
Capital to Risk Weighted Assets	11.40%	11.20%
Tier One Risk Based Capital to Risk Weighted Assets	9.30%	10.00%
Tier One Leverage Capital to Average Assets	9.00%	9.20%
Common Equity Tier One Risk-Based Capital Ratio	9.30%

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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 289,638	$ 23,224
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 8 months 12 days
Finite-Lived Trade Names, Gross	$ 350	0
Trade Name, Impaired, Accumulated Impairment Loss	0	0
Indefinite-Lived Trade Names	350	0
Finite-Lived Intangible Assets, Net	15,366
Intangible amortization	1,970	1,461	$ 2,388
Nevada [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	23,224
Northern California [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	149,602
Central Business Lines [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	116,811
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	40,804	26,157
Finite-Lived Intangible Assets, Accumulated Amortization	25,438	23,468
Finite-Lived Intangible Assets, Net	$ 15,366	$ 2,689

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Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Statistics [Line Items]
Assets	$ 14,275,089				$ 10,600,498				$ 14,275,089	$ 10,600,498
Cash, Cash Equivalents and Investment Securities	2,266,900				1,712,200				2,266,900	1,712,200
Loans, net of deferred loan fees and costs	11,112,854				8,398,265				11,112,854	8,398,265
Loans, net of deferred loan fees and costs	11,136,663								11,136,663
Less: Allowance for credit losses	(119,068)				(110,216)				(119,068)	(110,216)
Loans, net	10,993,786				8,288,049				10,993,786	8,288,049
Total loans held for investment	11,017,600								11,017,600
Intangible Assets, Net (Including Goodwill)	305,400				25,900				305,400	25,900
Other Assets Segment	641,300				517,200				641,300	517,200
Deposits	12,030,624				8,931,043				12,030,624	8,931,043
Stockholders' equity	1,591,502				1,000,928				1,591,502	1,000,928	$ 855,498	$ 759,421
Net interest income	143,343	$ 137,407	$ 108,718	$ 103,108	102,145	$ 98,073	$ 93,898	$ 90,777	492,576	384,893	332,895
Provision for Loan, Lease, and Other Losses	2,500	0	0	700	300	419	507	3,500	3,200	4,726	13,220
Net interest income (loss) after provision for credit losses	140,843	137,407	108,718	102,408	101,845	97,654	93,391	87,277	489,376	380,167	319,675
Non-interest income	9,479	8,502	5,545	6,242	8,417	6,073	5,599	4,562	29,768	24,651	22,197
Non-interest expense	(72,448)	(72,916)	(61,209)	(54,033)	(55,742)	(49,859)	(52,242)	(49,476)	(260,606)	(207,319)	(196,216)
Income from continuing operations before income taxes	77,874	72,993	53,054	54,617	54,520	53,868	46,748	42,363	258,538	197,499	145,656
Income tax expense (benefit)	19,348	17,133	13,579	14,234	14,111	12,949	10,706	10,624	64,294	48,390	29,830
Income from continuing operations					40,409	40,919	36,042	31,739	194,244	149,109	115,826
Loss from discontinued operations, net					0	0	(504)	(654)	0	(1,158)	(861)
Net income (loss)	58,526	$ 55,860	$ 39,475	$ 40,383	40,409	$ 40,919	$ 35,538	$ 31,085	194,244	147,951	$ 114,965
Other Repossessed Assets	43,900				57,100				43,900	57,100
Other Liabilities Segment	292,700				237,900				292,700	237,900
Liabilities	12,683,587				9,599,570				12,683,587	9,599,570
Liabilities and Equity	14,275,089				10,600,498				14,275,089	10,600,498
Excess Funds Provided (Used) Segment Basis	0				0				0	0
Other borrowings	360,328				430,700				360,328	430,700
Reportable Geographical Components [Member] | ARIZONA
Operating Statistics [Line Items]
Assets	2,836,200				2,363,800				2,836,200	2,363,800
Cash, Cash Equivalents and Investment Securities	2,300				2,300				2,300	2,300
Loans, net of deferred loan fees and costs					2,341,900					2,341,900
Loans, net of deferred loan fees and costs	2,811,700								2,811,700
Less: Allowance for credit losses	(30,100)				(30,700)				(30,100)	(30,700)
Loans, net					2,311,200					2,311,200
Total loans held for investment	2,781,600								2,781,600
Intangible Assets, Net (Including Goodwill)	0				0				0	0
Other Assets Segment	43,900				34,800				43,900	34,800
Deposits	2,880,700				2,178,000				2,880,700	2,178,000
Stockholders' equity	309,200				250,800				309,200	250,800
Net interest income									129,914	112,128
Provision for Loan, Lease, and Other Losses									3,099	2,083
Net interest income (loss) after provision for credit losses									126,815	110,045
Non-interest income									4,204	3,586
Non-interest expense									(59,917)	(54,859)
Income from continuing operations before income taxes									71,102	58,772
Income tax expense (benefit)									27,893	23,053
Income from continuing operations										35,719
Loss from discontinued operations, net										0
Net income (loss)									43,209	35,719
Other Repossessed Assets	8,400				15,500				8,400	15,500
Other Liabilities Segment	12,200				17,400				12,200	17,400
Liabilities	2,892,900				2,195,400				2,892,900	2,195,400
Liabilities and Equity	3,202,100				2,446,200				3,202,100	2,446,200
Excess Funds Provided (Used) Segment Basis	365,900				82,400				365,900	82,400
Other borrowings	0				0				0	0
Reportable Geographical Components [Member] | NEVADA
Operating Statistics [Line Items]
Assets	1,836,000				1,762,900				1,836,000	1,762,900
Cash, Cash Equivalents and Investment Securities	9,500				5,000				9,500	5,000
Loans, net of deferred loan fees and costs					1,668,700					1,668,700
Loans, net of deferred loan fees and costs	1,737,200								1,737,200
Less: Allowance for credit losses	(18,600)				(21,900)				(18,600)	(21,900)
Loans, net					1,646,800					1,646,800
Total loans held for investment	1,718,600								1,718,600
Intangible Assets, Net (Including Goodwill)	24,800				25,900				24,800	25,900
Other Assets Segment	62,300				64,200				62,300	64,200
Deposits	3,382,800				3,230,600				3,382,800	3,230,600
Stockholders' equity	244,400				209,000				244,400	209,000
Net interest income									122,082	117,508
Provision for Loan, Lease, and Other Losses									(6,887)	(7,542)
Net interest income (loss) after provision for credit losses									128,969	125,050
Non-interest income									9,202	8,944
Non-interest expense									(59,553)	(59,683)
Income from continuing operations before income taxes									78,618	74,311
Income tax expense (benefit)									27,516	26,009
Income from continuing operations										48,302
Loss from discontinued operations, net										0
Net income (loss)									51,102	48,302
Other Repossessed Assets	20,800				21,000				20,800	21,000
Other Liabilities Segment	29,000				40,800				29,000	40,800
Liabilities	3,411,800				3,271,400				3,411,800	3,271,400
Liabilities and Equity	3,656,200				3,480,400				3,656,200	3,480,400
Excess Funds Provided (Used) Segment Basis	1,820,200				1,717,500				1,820,200	1,717,500
Other borrowings	0				0				0	0
Reportable Geographical Components [Member] | CALIFORNIA
Operating Statistics [Line Items]
Assets	1,761,200				1,543,600				1,761,200	1,543,600
Cash, Cash Equivalents and Investment Securities	2,400				2,200				2,400	2,200
Loans, net of deferred loan fees and costs					1,553,100					1,553,100
Loans, net of deferred loan fees and costs	1,761,900								1,761,900
Less: Allowance for credit losses	(18,800)				(17,900)				(18,800)	(17,900)
Loans, net					1,535,200					1,535,200
Total loans held for investment	1,743,100								1,743,100
Intangible Assets, Net (Including Goodwill)	0				0				0	0
Other Assets Segment	15,700				6,200				15,700	6,200
Deposits	1,902,500				1,744,500				1,902,500	1,744,500
Stockholders' equity	191,300				70,900				191,300	70,900
Net interest income									94,585	91,090
Provision for Loan, Lease, and Other Losses									152	(1,638)
Net interest income (loss) after provision for credit losses									94,433	92,728
Non-interest income									2,697	3,917
Non-interest expense									(47,549)	(49,764)
Income from continuing operations before income taxes									49,581	46,881
Income tax expense (benefit)									20,849	19,711
Income from continuing operations										27,170
Loss from discontinued operations, net										0
Net income (loss)									28,732	27,170
Other Repossessed Assets	0				0				0	0
Other Liabilities Segment	7,800				8,900				7,800	8,900
Liabilities	1,910,300				1,753,400				1,910,300	1,753,400
Liabilities and Equity	2,101,600				1,824,300				2,101,600	1,824,300
Excess Funds Provided (Used) Segment Basis	340,400				280,700				340,400	280,700
Other borrowings	0				0				0	0
Reportable Geographical Components [Member] | Northern California [Member]
Operating Statistics [Line Items]
Assets					209,100					209,100
Cash, Cash Equivalents and Investment Securities					300					300
Loans, net of deferred loan fees and costs					198,600					198,600
Less: Allowance for credit losses					(5,100)					(5,100)
Loans, net					193,500					193,500
Intangible Assets, Net (Including Goodwill)					0					0
Other Assets Segment					15,300					15,300
Deposits					584,000					584,000
Stockholders' equity					126,800					126,800
Net interest income									56,698	9,133
Provision for Loan, Lease, and Other Losses									3,038	0
Net interest income (loss) after provision for credit losses									53,660	9,133
Non-interest income									5,161	184
Non-interest expense									(30,161)	(3,857)
Income from continuing operations before income taxes									28,660	5,460
Income tax expense (benefit)									12,051	2,296
Income from continuing operations										3,164
Loss from discontinued operations, net										0
Net income (loss)									16,609	3,164
Other Repossessed Assets					0					0
Other Liabilities Segment					200					200
Liabilities					584,200					584,200
Liabilities and Equity					711,000					711,000
Excess Funds Provided (Used) Segment Basis					501,900					501,900
Other borrowings					0					0
Operating Segments [Member] | Central Business Lines
Operating Statistics [Line Items]
Assets	3,710,200				2,578,900				3,710,200	2,578,900
Cash, Cash Equivalents and Investment Securities	0				0				0	0
Loans, net of deferred loan fees and costs					2,590,000					2,590,000
Loans, net of deferred loan fees and costs	3,597,900								3,597,900
Less: Allowance for credit losses	(38,500)				(34,000)				(38,500)	(34,000)
Loans, net					2,556,000					2,556,000
Total loans held for investment	3,559,400								3,559,400
Intangible Assets, Net (Including Goodwill)	122,400				0				122,400	0
Other Assets Segment	28,400				22,900				28,400	22,900
Deposits	2,134,400				946,600				2,134,400	946,600
Stockholders' equity	428,600				232,900				428,600	232,900
Net interest income									124,222	71,010
Provision for Loan, Lease, and Other Losses									3,917	11,365
Net interest income (loss) after provision for credit losses									120,305	59,645
Non-interest income									4,110	1,742
Non-interest expense									(45,831)	(27,804)
Income from continuing operations before income taxes									78,584	33,583
Income tax expense (benefit)									29,469	12,594
Income from continuing operations										20,989
Loss from discontinued operations, net										0
Net income (loss)									49,115	20,989
Other Repossessed Assets	0				0				0	0
Other Liabilities Segment	105,100				72,400				105,100	72,400
Liabilities	2,239,500				1,019,000				2,239,500	1,019,000
Liabilities and Equity	2,668,100				1,251,900				2,668,100	1,251,900
Excess Funds Provided (Used) Segment Basis	(1,042,100)				(1,327,000)				(1,042,100)	(1,327,000)
Other borrowings	0				0				0	0
Operating Segments [Member] | Northern California [Member]
Operating Statistics [Line Items]
Assets	1,352,700								1,352,700
Cash, Cash Equivalents and Investment Securities	2,400								2,400
Loans, net of deferred loan fees and costs	1,188,400								1,188,400
Less: Allowance for credit losses	(12,700)								(12,700)
Total loans held for investment	1,175,700								1,175,700
Intangible Assets, Net (Including Goodwill)	158,200								158,200
Other Assets Segment	16,100								16,100
Deposits	1,541,100								1,541,100
Stockholders' equity	293,200								293,200
Other Repossessed Assets	300								300
Other Liabilities Segment	11,200								11,200
Liabilities	1,552,300								1,552,300
Liabilities and Equity	1,845,500								1,845,500
Excess Funds Provided (Used) Segment Basis	492,800								492,800
Other borrowings	0								0
Corporate & Other
Operating Statistics [Line Items]
Assets	2,778,800				2,142,200				2,778,800	2,142,200
Cash, Cash Equivalents and Investment Securities	2,250,300				1,702,400				2,250,300	1,702,400
Loans, net of deferred loan fees and costs					46,000					46,000
Loans, net of deferred loan fees and costs	39,600								39,600
Less: Allowance for credit losses	(400)				(600)				(400)	(600)
Loans, net					45,400					45,400
Total loans held for investment	39,200								39,200
Intangible Assets, Net (Including Goodwill)	0				0				0	0
Other Assets Segment	474,900				373,800				474,900	373,800
Deposits	189,100				247,300				189,100	247,300
Stockholders' equity	124,800				110,500				124,800	110,500
Net interest income									(34,925)	(15,976)
Provision for Loan, Lease, and Other Losses									(119)	458
Net interest income (loss) after provision for credit losses									(34,806)	(16,434)
Non-interest income									4,394	6,278
Non-interest expense									(17,595)	(11,352)
Income from continuing operations before income taxes									(48,007)	(21,508)
Income tax expense (benefit)									(53,484)	(35,273)
Income from continuing operations										13,765
Loss from discontinued operations, net										(1,158)
Net income (loss)									5,477	12,607
Other Repossessed Assets	14,400				20,600				14,400	20,600
Other Liabilities Segment	127,400				98,200				127,400	98,200
Liabilities	676,800				776,200				676,800	776,200
Liabilities and Equity	801,600				886,700				801,600	886,700
Excess Funds Provided (Used) Segment Basis	(1,977,200)				(1,255,500)				(1,977,200)	(1,255,500)
Other borrowings	$ 360,300				$ 430,700				$ 360,300	$ 430,700

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Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 Subsidiary
Segment Reporting Information [Line Items]
Number of wholly-owned subsidiaries	10

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Employee Benefit Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Initial Percentage Of Discretionary Deferred Compensation	6.00%
Defined Benefit Plan, Contributions by Employer	$ 2,200,000	$ 1,700,000	$ 1,700,000
Defined Contribution Plan Percentage Of Discretionary Deferred Compensation	50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 18,000
Defined Contribution Plan Age Of Participants	50 years
Restoration Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 68,000	$ 77,000	$ 64,000
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Initial Percentage Of Discretionary Deferred Compensation	1.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	100.00%

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Employee Benefit Plan Accumulated Benefit Obligation and Funded Status of SERP (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2015	Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Benefit Obligation	$ 7,444	$ 7,122
Defined Benefit Plan, Service Cost	334
Defined Benefit Plan, Interest Cost	202
Defined Benefit Plan, Actuarial Gain (Loss)	(147)
Defined Benefit Plan, Benefits Paid	(67)
Defined Benefit Plan, Accumulated Benefit Obligation	$ (7,444)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.80%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.00%

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Employee Benefit Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 334
Defined Benefit Plan, Interest Cost	202
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	60
Defined Benefit Plan, Amortization of Gains (Losses)	(18)
Defined Benefit Plan, Net Periodic Benefit Cost	578
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	$ 42
Scenario, Forecast [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost		$ 596
Defined Benefit Plan, Interest Cost		426
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		96
Defined Benefit Plan, Amortization of Gains (Losses)		(96)
Defined Benefit Plan, Net Periodic Benefit Cost		1,022
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent		$ 0

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Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Loans and Leases Receivable, Related Parties	$ 74,381	$ 70,570	$ 30,783
Origination of Notes Receivable from Related Parties	10,678	35,341
Loans and Leases Receivable Advances, Related Parties	18,614	23,559
Loans and Leases Receivable Repayments, Related Parties	(25,481)	(19,113)
Related Party Deposit Liabilities	76,000	47,700
Interest Expense, Related Party	100
Related Party Transaction, Expenses from Transactions with Related Party	1,000	2,000
Interest Income, Related Party	2,700	1,900
Loan and Leases Receivable, Commitment Outstanding, Related Parties	$ 164,500	$ 151,800

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Parent Company Parent Company Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 224,640	$ 164,396	$ 305,514	$ 204,625
Money Market Funds, at Carrying Value	122	451
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	1,982,523	1,520,237
Loans, net of deferred loan fees and costs	11,112,854	8,398,265
Repossessed Assets	43,942	57,150	66,719	77,247
Other assets	273,976	198,696
Assets	14,275,089	10,600,498
Other borrowings	150,000	390,263
Liabilities	12,683,587	9,599,570
Stockholders' equity	1,591,502	1,000,928	855,498	759,421
Liabilities and Equity	14,275,089	10,600,498
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	7,627	11,855	$ 7,128	$ 15,712
Money Market Funds, at Carrying Value	122	451
Investment securities - AFS, at fair value; amortized cost of $1,966,034 at December 31, 2015 and $1,493,648 at December 31, 2014	50,507	51,335
Investments in and Advance to Bank Subsidiaries	1,522,245	987,882
Investments in and Advance to Non Bank Subsidiaries	2,424	9,827
Loans, net of deferred loan fees and costs	35,635	39,221
Repossessed Assets	14,471	16,318
Other assets	19,378	9,912
Assets	1,652,409	1,126,801
Other borrowings	0	83,182
Accrued Liabilities and Other Liabilities	2,537	2,254
Junior Subordinated Notes	58,370	40,437
Liabilities	60,907	125,873
Stockholders' equity	1,591,502	1,000,928
Liabilities and Equity	$ 1,652,409	$ 1,126,801

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Parent Company Parent Company Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Income Tax Expense (Benefit)	$ 19,348	$ 17,133	$ 13,579	$ 14,234	$ 14,111	$ 12,949	$ 10,706	$ 10,624	$ 64,294	$ 48,390	$ 29,830
Net income (loss)	58,526	55,860	39,475	40,383	40,409	40,919	35,538	31,085	194,244	147,951	114,965
Preferred Stock Dividends and Other Adjustments	151	176	247	176	329	353	352	353	750	1,387	1,410
Net income available to common shareholders	58,375	55,684	39,228	40,207	40,080	40,566	35,186	30,732	193,494	146,564	113,555
Non-interest income	9,479	8,502	5,545	6,242	8,417	6,073	5,599	4,562	29,768	24,651	22,197
Interest Expense	7,988	8,826	7,900	7,854	8,006	7,481	8,075	7,924	32,568	31,486	29,760
Noninterest Expense	72,448	72,916	61,209	54,033	55,742	49,859	52,242	49,476	260,606	207,319	196,216
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 77,874	$ 72,993	$ 53,054	$ 54,617	$ 54,520	$ 53,868	$ 46,748	$ 42,363	258,538	197,499	145,656
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investment Income, Dividend									140,900	67,515	71,529
Income Tax Expense (Benefit)									5,876	5,388	21,426
Income Before Equity in Undistributed Earnings of Subsidiaries									133,887	59,395	56,963
Income (Loss) from Subsidiaries, Net of Tax									60,357	88,556	58,002
Net income (loss)									194,244	147,951	114,965
Preferred Stock Dividends and Other Adjustments									750	1,387	1,410
Net income available to common shareholders									193,494	146,564	113,555
Interest Income, Other									4,593	4,381	2,847
Non-interest income									586	1,235	3,995
Revenues									146,079	73,131	78,371
Interest Expense									6,671	8,776	10,833
Noninterest Expense									11,397	10,348	32,001
Operating Expenses									18,068	19,124	42,834
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									$ 128,011	$ 54,007	$ 35,537

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Parent Company Parent Company Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 58,526	$ 55,860	$ 39,475	$ 40,383	$ 40,409	$ 40,919	$ 35,538	$ 31,085	$ 194,244	$ 147,951	$ 114,965
Excess tax benefit of stock-based compensation									(5,874)	(4,194)	(1,552)
Gains (Losses) on Extinguishment of Debt									(81)	(502)	(1,387)
Net Cash Provided by (Used in) Operating Activities									212,812	163,289	165,049
Principal pay downs and maturities									347	1,144	1,881
Proceeds from Sale (Payments to Purchase) Investment In Money Market									330	2,181	(1,968)
Net Cash Provided by (Used in) Investing Activities									(1,366,443)	(1,386,013)	(1,173,342)
Excess tax benefit of stock-based compensation									5,874	4,194	1,552
Proceeds from Issuance of Common Stock									28,288	13,746	0
Proceeds from exercise of common stock options									1,935	8,294	4,595
Net Cash Provided by (Used in) Financing Activities									1,213,875	1,081,606	1,109,182
Cash and Cash Equivalents, Period Increase (Decrease)									60,244	(141,118)	100,889
Cash and Cash Equivalents, at Carrying Value	224,640				164,396				224,640	164,396	305,514	$ 204,625
Interest									28,831	26,516	28,613
Income taxes									54,590	35,556	19,105
Change in unrealized gain on AFS securities, net of tax									(6,502)	29,209	0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Subordinated Debt									(4,276)	0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									194,244	147,951	114,965
Income (Loss) from Subsidiaries, Net of Tax									(60,357)	(88,556)	(58,002)
Excess tax benefit of stock-based compensation									(1,945)	(4,194)	(1,552)
Change in Unrealized Gains Losses on Trust Preferred Securities									0	(1,421)	5,640
Gains (Losses) on Extinguishment of Debt									0	502	1,387
Other Operating Activities, Cash Flow Statement									(4,734)	(20,040)	(4,011)
Net Cash Provided by (Used in) Operating Activities									127,208	34,242	58,427
Payments to Acquire Marketable Securities									0	(23,431)	(2,044)
Principal pay downs and maturities									2,358	8,376	6,767
Proceeds From Sale Of Other Repossessed Assets Net									4,138	9,610	9,844
Payments to Acquire Interest in Subsidiaries and Affiliates									0	0	(40,000)
Loan fundings and principal collections, net									3,704	3,286	(35,979)
Proceeds from Sale (Payments to Purchase) Investment In Money Market									330	2,181	(1,968)
Payments to Acquire Productive Assets									0	617	(481)
Proceeds from Divestiture of Businesses									(19,440)	0	0
Net Cash Provided by (Used in) Investing Activities									(8,910)	639	(63,861)
Proceeds from Other Debt									0	22,000	3,000
Excess tax benefit of stock-based compensation									1,945	4,194	1,552
Repayments of Other Debt									(83,444)	(6,501)	(10,887)
Proceeds from Issuance of Common Stock									28,288	13,746	0
Proceeds from exercise of common stock options									1,935	8,294	4,595
Payments for Repurchase of Preferred Stock and Preference Stock									(70,500)	(70,500)	0
Payments of Dividends									(750)	(1,387)	(1,410)
Net Cash Provided by (Used in) Financing Activities									(122,526)	(30,154)	(3,150)
Cash and Cash Equivalents, Period Increase (Decrease)									(4,228)	4,727	(8,584)
Cash and Cash Equivalents, at Carrying Value	$ 7,627				$ 11,855				7,627	11,855	7,128	$ 15,712
Interest									4,235	9,067	11,091
Income taxes									54,590	32,238	19,105
Change in unrealized gain on AFS securities, net of tax									1,199	2,031	2,450
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Subordinated Debt									$ (4,276)	$ 0	$ 0

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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data Disclosure [Abstract]
Interest and Dividend Income, Operating	$ 151,331	$ 146,233	$ 116,618	$ 110,962	$ 110,151	$ 105,554	$ 101,973	$ 98,701	$ 525,144	$ 416,379	$ 362,655
Interest Expense	7,988	8,826	7,900	7,854	8,006	7,481	8,075	7,924	32,568	31,486	29,760
Interest Income (Expense), Net	143,343	137,407	108,718	103,108	102,145	98,073	93,898	90,777	492,576	384,893	332,895
Provision for Loan, Lease, and Other Losses	2,500	0	0	700	300	419	507	3,500	3,200	4,726	13,220
Interest Income (Expense), after Provision for Loan Loss	140,843	137,407	108,718	102,408	101,845	97,654	93,391	87,277	489,376	380,167	319,675
Non-interest income	9,479	8,502	5,545	6,242	8,417	6,073	5,599	4,562	29,768	24,651	22,197
Non-interest expense	(72,448)	(72,916)	(61,209)	(54,033)	(55,742)	(49,859)	(52,242)	(49,476)	(260,606)	(207,319)	(196,216)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	77,874	72,993	53,054	54,617	54,520	53,868	46,748	42,363	258,538	197,499	145,656
Income Tax Expense (Benefit)	19,348	17,133	13,579	14,234	14,111	12,949	10,706	10,624	64,294	48,390	29,830
Income (Loss) from Continuing Operations Attributable to Parent					40,409	40,919	36,042	31,739	194,244	149,109	115,826
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent					0	0	(504)	(654)	0	(1,158)	(861)
Net income (loss)	58,526	55,860	39,475	40,383	40,409	40,919	35,538	31,085	194,244	147,951	114,965
Preferred Stock Dividends and Other Adjustments	151	176	247	176	329	353	352	353	750	1,387	1,410
Net income available to common shareholders	$ 58,375	$ 55,684	$ 39,228	$ 40,207	$ 40,080	$ 40,566	$ 35,186	$ 30,732	$ 193,494	$ 146,564	$ 113,555
Earnings Per Share, Basic	$ 0.58	$ 0.55	$ 0.44	$ 0.46	$ 0.46	$ 0.47	$ 0.41	$ 0.35	$ 2.05	$ 1.69	$ 1.33
Earnings Per Share, Diluted	$ 0.57	$ 0.55	$ 0.44	$ 0.45	$ 0.46	$ 0.46	$ 0.40	$ 0.35	$ 2.03	$ 1.67	$ 1.31