10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

ý Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the quarterly period ended June 30, 2018

¨ Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the transition period from to

Commission file number 001-34657

TEXAS CAPITAL BANCSHARES, INC.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	75-2679109
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

2000 McKinney Avenue, Suite 700, Dallas, Texas, U.S.A.	75201
(Address of principal executive officers)	(Zip Code)

214/932-6600

(Registrant’s telephone number,

including area code)

N/A

(Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act 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 (Section 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 whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	ý		Accelerated Filer	¨
Non-Accelerated Filer	¨	(Do not check if a smaller reporting company)	Smaller Reporting Company	¨
Emerging Growth Company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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

APPLICABLE ONLY TO CORPORATE ISSUERS:

On July 18, 2018, the number of shares set forth below was outstanding with respect to each of the issuer’s classes of common stock:

Common Stock, par value $0.01 per share 50,158,736

Texas Capital Bancshares, Inc.

Form 10-Q

Quarter Ended June 30, 2018

Index

Part I. Financial Information
Item 1.	Financial Statements
	Consolidated Balance Sheets—Unaudited	3
	Consolidated Statements of Income and Other Comprehensive Income—Unaudited	4
	Consolidated Statements of Stockholders’ Equity—Unaudited	5
	Consolidated Statements of Cash Flows—Unaudited	6
	Notes to Consolidated Financial Statements—Unaudited	7
	Quarterly Financial Summaries—Unaudited	32
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	48
Item 4.	Controls and Procedures	51
Part II. Other Information
Item 1.	Legal Proceedings	51
Item 1A.	Risk Factors	51
Item 6.	Exhibits	52
Signatures		53

2

PART I – FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands except share data)

	June 30, 2018			December 31, 2017
	(Unaudited)
Assets
Cash and due from banks	$	174,687		$	178,010
Interest-bearing deposits in other banks	3,249,107			2,697,581
Federal funds sold and securities purchased under resale agreements	39,000			30,000
Investment securities	24,408			23,511
Loans held for sale ($1,275.5 million and $1,007.7 million at June 30, 2018 and December 31, 2017, respectively, at fair value)	1,276,768			1,011,004
Loans held for investment, mortgage finance	5,923,058			5,308,160
Loans held for investment (net of unearned income)	16,536,721			15,366,252
Less: Allowance for loan losses	179,096			184,655
Loans held for investment, net	22,280,683			20,489,757
Mortgage servicing rights, net	82,776			85,327
Premises and equipment, net	26,175			25,176
Accrued interest receivable and other assets	609,501			516,239
Goodwill and intangible assets, net	18,805			19,040
Total assets	$	27,781,910		$	25,075,645
Liabilities and Stockholders’ Equity
Liabilities:
Deposits:
Non-interest-bearing	$	7,648,125		$	7,812,660
Interest-bearing	12,686,746			11,310,520
Total deposits	20,334,871			19,123,180
Accrued interest payable	11,268			7,680
Other liabilities	176,400			182,212
Federal funds purchased and repurchase agreements	520,849			365,040
Other borrowings	4,000,000			2,800,000
Subordinated notes, net	281,586			281,406
Trust preferred subordinated debentures	113,406			113,406
Total liabilities	25,438,380			22,872,924
Stockholders’ equity:
Preferred stock, $.01 par value, $1,000 liquidation value:
Authorized shares – 10,000,000
Issued shares – 6,000,000 shares issued at June 30, 2018 and December 31, 2017	150,000			150,000
Common stock, $.01 par value:
Authorized shares – 100,000,000
Issued shares – 50,151,481 and 49,643,761 at June 30, 2018 and December 31, 2017, respectively	502			496
Additional paid-in capital	963,732			961,305
Retained earnings	1,228,924			1,090,500
Treasury stock – shares at cost: 417 at June 30, 2018 and December 31, 2017	(8		)	(8		)
Accumulated other comprehensive income, net of taxes	380			428
Total stockholders’ equity	2,343,530			2,202,721
Total liabilities and stockholders’ equity	$	27,781,910		$	25,075,645

See accompanying notes to consolidated financial statements.

3

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME – UNAUDITED

(In thousands except per share data)

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Interest income
Interest and fees on loans	$	279,447		$	201,646		$	523,311		$	378,270
Investment securities	193			287			399			512
Federal funds sold and securities purchased under resale agreements	745			434			1,790			964
Interest-bearing deposits in other banks	6,467			5,824			15,221			12,391
Total interest income	286,852			208,191			540,721			392,137
Interest expense
Deposits	39,607			16,533			71,309			29,826
Federal funds purchased	1,665			726			2,634			978
Other borrowings	8,484			2,901			14,164			4,922
Subordinated notes	4,191			4,191			8,382			8,382
Trust preferred subordinated debentures	1,193			881			2,220			1,711
Total interest expense	55,140			25,232			98,709			45,819
Net interest income	231,712			182,959			442,012			346,318
Provision for credit losses	27,000			13,000			39,000			22,000
Net interest income after provision for credit losses	204,712			169,959			403,012			324,318
Non-interest income
Service charges on deposit accounts	3,005			3,067			6,142			6,112
Wealth management and trust fee income	2,007			1,402			3,931			2,759
Bank owned life insurance (BOLI) income	657			481			1,316			947
Brokered loan fees	5,815			5,809			10,983			11,487
Servicing income	4,967			3,700			10,459			5,901
Swap fees	1,352			954			2,914			2,757
Other	(524		)	3,356			1,481			5,916
Total non-interest income	17,279			18,769			37,226			35,879
Non-interest expense
Salaries and employee benefits	72,404			63,154			144,941			126,157
Net occupancy expense	7,356			6,515			14,590			12,626
Marketing	10,236			6,157			18,913			11,107
Legal and professional	11,654			7,127			19,184			14,580
Communications and technology	7,143			11,906			13,776			18,412
FDIC insurance assessment	6,257			4,603			12,360			10,597
Servicing related expenses	4,367			2,682			8,172			4,432
Allowance and other carrying costs for other real estate owned (OREO)	176			71			2,331			210
Other	12,538			9,599			24,824			19,787
Total non-interest expense	132,131			111,814			259,091			217,908
Income before income taxes	89,860			76,914			181,147			142,289
Income tax expense	18,424			25,819			37,766			48,652
Net income	71,436			51,095			143,381			93,637
Preferred stock dividends	2,437			2,437			4,875			4,875
Net income available to common stockholders	$	68,999		$	48,658		$	138,506		$	88,762
Other comprehensive income (loss)
Change in net unrealized gain on available-for-sale debt securities arising during period, before-tax	$	(104	)	$	(33	)	$	(167	)	$	(30	)
Income tax expense (benefit) related to net unrealized gain on available-for-sale debt securities	(22		)	(11		)	(35		)	(10		)
Other comprehensive income (loss), net of tax	(82		)	(22		)	(132		)	(20		)
Comprehensive income	$	71,354		$	51,073		$	143,249		$	93,617
Basic earnings per common share	$	1.39		$	0.98		$	2.79		$	1.79
Diluted earnings per common share	$	1.38		$	0.97		$	2.76		$	1.77

See accompanying notes to consolidated financial statements.

4

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - UNAUDITED

(In thousands except share data)

	Preferred Stock			Common Stock									Treasury Stock
	Shares	Amount		Shares	Amount		Additional Paid-in Capital			Retained Earnings			Shares		Amount			Accumulated Other Comprehensive Income (Loss), Net of Taxes			Total
Balance at December 31, 2016 (audited)	6,000,000	$	150,000	49,504,079	$	495	$	955,468		$	903,187		(417	)	$	(8	)	$	415		$	2,009,557
Comprehensive income:
Net income	—	—		—	—		—			93,637			—		—			—			93,637
Change in unrealized gain on available-for-sale securities, net of taxes of $10	—	—		—	—		—			—			—		—			(20		)	(20		)
Total comprehensive income																					93,617
Stock-based compensation expense recognized in earnings	—	—		—	—		3,461			—			—		—			—			3,461
Preferred stock dividend	—	—		—	—		—			(4,875		)	—		—			—			(4,875		)
Issuance of stock related to stock-based awards	—	—		57,995	1		(1,208		)	—			—		—			—			(1,207		)
Issuance of common stock related to warrants	—	—		33,595	—		—			—			—		—			—			—
Balance at June 30, 2017	6,000,000	$	150,000	49,595,669	$	496	$	957,721		$	991,949		(417	)	$	(8	)	$	395		$	2,100,553
Balance at December 31, 2017 (audited)	6,000,000	$	150,000	49,643,761	$	496	$	961,305		$	1,090,500		(417	)	$	(8	)	$	428		$	2,202,721
Impact of adoption of new accounting standards(1)	—	—		—	—		—			(82		)	—		—			84			2
Comprehensive income:
Net income	—	—		—	—		—			143,381			—		—			—			143,381
Change in unrealized gain on available-for-sale debt securities, net of taxes of $35	—	—		—	—		—			—			—		—			(132		)	(132		)
Total comprehensive income																					143,249
Stock-based compensation expense recognized in earnings	—	—		—	—		4,091			—			—		—			—			4,091
Preferred stock dividend	—	—		—	—		—			(4,875		)	—		—			—			(4,875		)
Issuance of stock related to stock-based awards	—	—		71,072	1		(1,659		)	—			—		—			—			(1,658		)
Issuance of common stock related to warrants	—	—		436,648	5		(5		)	—			—		—			—			—
Balance at June 30, 2018	6,000,000	$	150,000	50,151,481	$	502	$	963,732		$	1,228,924		(417	)	$	(8	)	$	380		$	2,343,530

(1) Represents the impact of adopting Accounting Standard Update ("ASU") 2018-02 and ASU 2016-01. See Note 1 to the consolidated financial statements for more information.

See accompanying notes to consolidated financial statements.

5

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS—UNAUDITED

(In thousands)

	Six months ended June 30,
	2018			2017
Operating activities
Net income	$	143,381		$	93,637
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	39,000			22,000
Depreciation and amortization	16,214			12,346
Decrease in valuation allowance on mortgage servicing rights	(757		)	—
Bank owned life insurance (BOLI) income	(1,316		)	(947		)
Stock-based compensation expense	11,197			8,954
Purchases and originations of loans held for sale	(3,205,483		)	(2,843,690		)
Proceeds from sales and repayments of loans held for sale	2,908,777			2,939,002
Proceeds from sale of MSRs	22,439			—
Net loss on sale of loans held for sale and other assets	7,648			93
Technology write-off	—			5,285
Increase in OREO valuation allowance	2,000			—
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(97,710		)	(46,025		)
Accrued interest payable and other liabilities	(14,289		)	(488		)
Net cash provided by (used in) operating activities	(168,899		)	190,167
Investing activities
Purchases of investment securities	(3,323		)	(96,871		)
Maturities and calls of available-for-sale securities	349			275
Principal payments received on available-for-sale securities	1,644			2,397
Originations of mortgage finance loans	(45,661,608		)	(37,251,933		)
Proceeds from pay-offs of mortgage finance loans	45,046,710			36,565,671
Net increase in loans held for investment, excluding mortgage finance loans	(1,213,641		)	(1,297,460		)
Purchase of premises and equipment, net	(5,212		)	(4,194		)
Proceeds from sale of foreclosed assets	216			272
Net cash provided by investing activities	(1,834,865		)	(2,081,843		)
Financing activities
Net increase in deposits	1,211,691			275,392
Costs from issuance of stock related to stock-based awards and warrants	(1,658		)	(1,207		)
Preferred dividends paid	(4,875		)	(4,875		)
Net increase in other borrowings	1,200,000			700,000
Net increase in Federal funds purchased and repurchase agreements	155,809			352,649
Net cash provided by financing activities	2,560,967			1,321,959
Net increase (decrease) in cash and cash equivalents	557,203			(569,717		)
Cash and cash equivalents at beginning of period	2,905,591			2,839,352
Cash and cash equivalents at end of period	$	3,462,794		$	2,269,635
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	$	95,121		$	45,071
Cash paid during the period for income taxes	49,770			52,042
Transfers from loans/leases to OREO and other repossessed assets	—			—

See accompanying notes to consolidated financial statements.

6

TEXAS CAPITAL BANCSHARES, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—UNAUDITED

(1) OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Business

Texas Capital Bancshares, Inc. (the “Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the “Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional and national clientèle of commercial borrowers. We are primarily a secured lender with a majority of our loans being made to businesses headquartered or with operations in Texas. At the same time, our national lines of business continue to provide specialized lending products to businesses throughout the United States.

Basis of Presentation

Our accounting and reporting policies conform to accounting principles generally accepted in the United States (“GAAP”) and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation.

The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2017, included in our Annual Report on Form 10-K filed with the SEC on February 14, 2018 (the “2017 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.

Accounting Changes

ASU 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02") allows a reclassification from accumulated other comprehensive income (loss) ("AOCI") to retained earnings for the stranded tax effects caused by the revaluation of deferred taxes resulting from the newly enacted corporate tax rate in the Tax Cuts and Jobs Act. The ASU is effective in years beginning after December 15, 2018, but permits early adoption in a period for which financial statements have not yet been issued. We have elected to early adopt the ASU as of January 1, 2018. The adoption of the guidance resulted in an insignificant cumulative-effect adjustment that decreased retained earnings and increased AOCI in the first quarter of 2018.

ASU 2016-15 "Statement of Cash Flows (Topic 230)" ("ASU 2016-15") is intended to reduce the diversity in practice around how certain transactions are classified within the statement of cash flows. ASU 2016-15 became effective for us on January 1, 2018 and did not have a significant impact on our financial statements.

ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10): Recognition of Financial Assets and Financial Liabilities, ("ASU 2016-01") makes targeted amendments to the guidance for recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 requires equity investments, other than equity method investments, to be measured at fair value with changes in fair value recognized in net income. The ASU requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption to reclassify the cumulative change in fair value of equity securities previously recognized in AOCI. ASU 2016-01 became effective for us on January 1, 2018. The adoption of the guidance resulted in an insignificant cumulative-effect adjustment that increased retained earnings, with offsetting related adjustments to deferred taxes and AOCI. ASU 2016-01 also emphasizes the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities should not make use of a practicability exception in determining the fair value of loans. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation did not have a significant impact on our fair value disclosures. See Note 11 - Fair Value Disclosures.

7

ASU 2014-09 "Revenue from Contracts with Customers (Topic 606)" ("ASU 2014-09") implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance does not apply to revenue associated with financial instruments, including loans and investment securities that are accounted for under other GAAP, which comprises a significant portion of our revenue stream. ASU 2014-09 became effective for us on January 1, 2018 and had no material effect on how we recognize revenue or to our consolidated financial statements and disclosures. See below for additional information related to revenue generated from contracts with customers.

Revenue Recognition

Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the entity's contracts to provide goods or services to customers. The core principle requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied.

The majority of our revenue-generating transactions are not subject to ASC 606, including revenue generated from financial instruments, such as our loans, letters of credit, derivatives and investment securities, as well as revenue related to our mortgage servicing activities, as these activities are subject to other GAAP discussed elsewhere within our disclosures. Descriptions of our revenue-generating activities that are within the scope of ASC 606, which are presented in our income statements as components of non-interest income are as follows:

• Service charges on deposit accounts - these represent general service fees for monthly account maintenance and activity- or transaction-based fees and consist of transaction-based revenue, time-based revenue (service period), item-based revenue or some other individual attribute-based revenue. Revenue is recognized when our performance obligation is completed which is generally monthly for account maintenance services or when a transaction has been completed (such as a wire transfer). Payments for such performance obligations are generally received at the time the performance obligations are satisfied.

• Wealth management and trust fee income - this represents monthly fees due from wealth management customers as consideration for managing the customers' assets. Wealth management and trust services include custody of assets, investment management, escrow services, fees for trust services and similar fiduciary activities. Revenue is recognized when our performance obligation is completed each month, which is generally the time that payment is received. Also included are fees received from a third party broker-dealers as part of a revenue-sharing agreement for fees earned from customers that we refer to the third party. These fees are paid to us by the third party on a quarterly basis and recognized ratably throughout the quarter as our performance obligation is satisfied.

• Brokered loan fees - these represent fees for the administration and funding of purchased mortgage loan interests as well as facility renewal and application fees received from mortgage originator customers in our warehouse lending business. Also included are fees received from independent correspondent mortgage lenders as consideration for our purchase of individual residential mortgage loans through our Mortgage Correspondent Aggregation ("MCA") business. Revenue related to the warehouse lending business is recognized when the related loan interest is disposed (i.e., through sale or payoff) or upon receipt of the facility renewal or application. Revenue related to our MCA business is recognized at the time a loan is purchased.

• Other non-interest income primarily includes items such as letter of credit fees, gains on sale of loans held for sale and servicing fees related to the MCA program, none of which are subject to the requirements of ASC 606.

Investment Securities

Investment securities includes available-for-sale debt securities and equity securities at fair value.

Debt Securities

Debt securities are classified as trading, available-for-sale or held-to-maturity. Management classifies debt securities at the time of purchase and re-assesses such designation at each balance sheet date; however, transfers between categories from this re-assessment are rare.

8

Trading Account

Debt securities acquired for resale in anticipation of short-term market movements are classified as trading, with realized and unrealized gains and losses recognized in income. To date, we have not had any activity in our trading account.

Held-to-Maturity

Debt securities are classified as held to maturity when we have the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost. Debt securities not classified as held-to-maturity or trading are classified as available-for-sale.

Available-for-Sale

Available-for-sale debt securities are stated at fair value, with the unrealized gains and losses reported as a separate component of AOCI, net of tax. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, or in the case of mortgage-backed securities, over the estimated life of the security. Such amortization and accretion is included in interest income from securities. Realized gains and losses and declines in value judged to be other-than-temporary are included in gain (loss) on sale of securities. The cost of securities sold is based on the specific identification method.

All debt securities are available-for-sale as of June 30, 2018 and December 31, 2017.

Equity Securities

Beginning January 1, 2018, upon adoption of ASU 2016-01, equity securities with readily determinable fair values are stated at fair value with realized and unrealized gains and losses reported in other non-interest income in the consolidated statements of income and other comprehensive income. For periods prior to January 1, 2018, equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. Equity securities without readily determinable fair values are recorded at cost less any impairment, if any.

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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of stock-based compensation awards, the fair value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

9

(2) EARNINGS PER COMMON SHARE

The following table presents the computation of basic and diluted earnings per share (in thousands except share data):

	Three months ended   June 30,				Six months ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	71,436	$	51,095	$	143,381	$	93,637
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	68,999		48,658		$	138,506	88,762
Denominator:
Denominator for basic earnings per share—weighted average shares	49,736,384		49,576,837		49,695,783		49,556,393
Effect of employee stock-based awards(1)	348,762		224,306		336,285		244,058
Effect of warrants to purchase common stock	10,869		428,527		112,884		432,660
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,096,015		50,229,670		50,144,952		50,233,111
Basic earnings per common share	$	1.39	$	0.98	$	2.79	$	1.79
Diluted earnings per common share	$	1.38	$	0.97	$	2.76	$	1.77

(1) SARs and RSUs outstanding of 4,000 at June 30, 2018 and 6,200 at June 30, 2017 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

(3) INVESTMENT SECURITIES

Available-for-Sale Debt Securities

The following is a summary of available-for-sale debt securities (in thousands):

	June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	8,304	$	481	$	—	$	8,785
	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	10,297	$	648	$	—	$	10,945

The amortized cost and estimated fair value of available-for-sale debt securities are presented below by contractual maturity (in thousands, except percentage data):

	June 30, 2018
	Less Than One Year		After One Through Five Years		After Five Through Ten Years		After Ten Years		Total
Residential mortgage-backed securities:(1)
Amortized cost	50		1,895		—		6,359		8,304
Estimated fair value	52		2,038		—		6,695		8,785
Weighted average yield(2)	5.24	%	5.55	%	—	%	3.75	%	4.17	%

10

	December 31, 2017
	Less Than One Year			After One Through Five Years			After Five Through Ten Years			After Ten Years			Total
Residential mortgage-backed securities:(1)
Amortized cost	$	409		$	819		$	1,502		$	7,567		$	10,297
Estimated fair value	418			916			1,636			7,975			10,945
Weighted average yield(2)	4.59		%	6.02		%	5.32		%	3.45		%	3.97		%

(1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

(2) Yields are calculated based on amortized cost.

As of June 30, 2018 and December 31, 2017, we did not have any available-for-sale debt securities in an unrealized loss position.

At June 30, 2018, available-for-sale debt securities with carrying values of $2.0 million and $5.8 million were pledged to secure certain deposits and repurchase agreements, respectively.

Equity Securities

Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. At June 30, 2018 and December 31, 2017, we had $15.6 million and $12.6 million, respectively, in equity securities recorded at fair value. Prior to January 1, 2018, equity securities were stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. At December 31, 2017, net unrealized gains of $10,000 had been recognized in AOCI. On January 1, 2018, these unrealized gains and losses were reclassified out of AOCI and into retained earnings with subsequent changes in fair value being recognized in other non-interest income. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2018 (in thousands):

	Three months ended			Six months ended
	June 30, 2018			June 30, 2018
Net gains and (losses) recognized during the period on equity securities	$	108		$	(104	)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period	162			162
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date	$	(54	)	$	(266	)

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(4) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR LOAN LOSSES

At June 30, 2018 and December 31, 2017, loans held for investment were as follows (in thousands):

	June 30, 2018			December 31, 2017
Commercial	$	10,189,832		$	9,189,811
Mortgage finance	5,923,058			5,308,160
Construction	2,226,590			2,166,208
Real estate	3,868,411			3,794,577
Consumer	46,652			48,684
Leases	314,575			264,903
Gross loans held for investment	22,569,118			20,772,343
Deferred income (net of direct origination costs)	(109,339		)	(97,931		)
Allowance for loan losses	(179,096		)	(184,655		)
Total loans held for investment, net	$	22,280,683		$	20,489,757

Commercial Loans and Leases. Our commercial loan portfolio is comprised of lines of credit for working capital and term loans and leases to finance equipment and other business assets. Our energy production loans are generally collateralized with proven reserves based on appropriate valuation standards and take into account the risk of oil and gas price volatility. Our commercial loans and leases are underwritten after carefully evaluating and understanding the borrower’s ability to operate profitably. Our underwriting standards are designed to promote relationship banking rather than to make loans on a transaction basis. Our lines of credit typically are limited to a percentage of the value of the assets securing the line. Lines of credit and term loans typically are reviewed annually, or more frequently, as needed, and are supported by accounts receivable, inventory, equipment and other assets of our clients’ businesses.

Mortgage Finance Loans. Our mortgage finance loans consist of ownership interests purchased in single-family residential mortgages funded through our mortgage finance group. We have agreements with mortgage lenders and purchase interests in individual loans they originate. The ownership interests collateralizing our mortgage finance loans are typically held on our balance sheet for 10 to 20 days, and substantially all loans are conforming loans. Substantially all mortgage loans are underwritten consistently with established programs for permanent financing with financially sound investors. Balances as of June 30, 2018 and December 31, 2017 are stated net of $242.7 million and $171.2 million of participations sold, respectively.

Construction Loans. Our construction loan portfolio consists primarily of single- and multi-family residential properties and commercial projects used in manufacturing, warehousing, service or retail businesses. Our construction loans generally have terms of one to three years. We typically make construction loans to developers, builders and contractors that have an established record of successful project completion and loan repayment and have a substantial equity investment in the borrowers. Loan amounts are derived primarily from the Bank's evaluation of expected cash flows available to service debt from stabilized projects under hypothetically stressed conditions. Construction loans are also based in part upon estimates of costs and value associated with the completed project. Sources of repayment for these types of loans may be permanent loans from other lenders, sales of developed property, or an interim loan commitment from us until permanent financing is obtained. The nature of these loans makes ultimate repayment sensitive to overall economic conditions. Borrowers may not be able to correct conditions of loan defaults, increasing risk of exposure to classification, non-performing status, reserve allocation and actual credit loss and foreclosure. These loans typically have floating rates and require commitment fees.

Real Estate Loans. A portion of our real estate loan portfolio is comprised of loans secured by properties other than market risk or investment-type real estate. Market risk loans are real estate loans where the primary source of repayment is expected to come from the sale, permanent financing or lease of the real property collateral. We generally provide temporary financing for commercial and residential property. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Our real estate loans generally have maximum terms of five to seven years, and we provide loans with both floating and fixed rates. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Appraised values may be highly variable due to market conditions and the impact of the inability of potential purchasers and lessees to obtain financing and a lack of transactions at comparable values.

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At June 30, 2018 and December 31, 2017, we had a blanket floating lien on certain real estate-secured loans, mortgage finance loans and certain investment securities used as collateral for Federal Home Loan Bank borrowings.

Summary of Loan Loss Experience

The allowance for loan losses is comprised of general reserves, specific reserves for impaired loans and an additional qualitative reserve based on our estimate of losses inherent in the portfolio at the balance sheet date, but not yet identified with specified loans. We consider the allowance at June 30, 2018 to be appropriate, given management's assessment of losses inherent in the portfolio as of the evaluation date, the significant growth in the loan and lease portfolio, current economic conditions in our market areas and other factors.

The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	9,945,020	$	5,923,058	$	2,211,981	$	3,778,808	$	46,493	$	299,825	$	22,205,185
Special mention	87,297		—		14,609		56,003		—		—		157,909
Substandard-accruing	77,929		—		—		31,057		93		13,650		122,729
Non-accrual	79,586		—		—		2,543		66		1,100		83,295
Total loans held for investment	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	8,967,471	$	5,308,160	$	2,152,654	$	3,706,541	$	48,591	$	249,865	$	20,433,282
Special mention	19,958		—		13,554		53,652		—		495		87,659
Substandard-accruing	102,651		—		—		32,671		93		14,543		149,958
Non-accrual	99,731		—		—		1,713		—		—		101,444
Total loans held for investment	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343

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The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018 and 2017. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.

June 30, 2018
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	118,806	$	—	$	19,273		$	34,287		$	357		$	3,542		$	8,390		$	184,655
Provision for loan losses	38,920		—		621			928			(205		)	860			(3,511		)	37,613
Charge-offs	43,972		—		—			—			—			—			—			43,972
Recoveries	680		—		—			32			68			20			—			800
Net charge-offs (recoveries)	43,292		—		—			(32		)	(68		)	(20		)	—			43,172
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
Period end amount allocated to:
Loans individually evaluated for impairment	$	11,772	$	—	$	—		$	73		$	11		$	495		$	—		$	12,351
Loans collectively evaluated for impairment	102,662		—		19,894			35,174			209			3,927			4,879			166,745
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
June 30, 2017
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	128,768	$	—	$	13,144		$	19,149		$	241		$	1,124		$	5,700		$	168,126
Provision for loan losses	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225

The table below presents the activity in the allowance for off-balance sheet credit losses related to unfunded commitments for the three and six months ended June 30, 2018 and 2017 (in thousands). This allowance is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Beginning balance	$	9,623	$	10,847		$	9,071	$	11,422
Provision for off-balance sheet credit losses	835		(1,642		)	1,387		(2,217		)
Ending balance	$	10,458	$	9,205		$	10,458	$	9,205

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We have traditionally maintained an additional qualitative reserve component to compensate for the uncertainty and complexity in estimating loan and lease losses including factors and conditions that may not be fully reflected in the determination and application of the allowance allocation percentages. The decrease in the additional qualitative reserve at June 30, 2018 as compared to December 31, 2017 was primarily related to the resolution of remaining uncertainty regarding the impact to our loan portfolio from Hurricanes Harvey and Irma. We believe the level of additional qualitative reserves at June 30, 2018 is warranted due to uncertainties and unpredictable factors that have produced losses, including those resulting from borrowers' misstatement of financial information or inaccurate certification of collateral values. Such losses are not necessarily correlated with historical loss trends or general economic conditions. Our methodology used to calculate the allowance considers historical losses; however, the historical loss rates for specific product types or credit risk grades may not fully incorporate the effects of uncertainties or unpredictable events.

Our recorded investment in loans as of June 30, 2018, December 31, 2017 and June 30, 2017 related to each balance in the allowance for loan losses by portfolio segment and disaggregated on the basis of our impairment methodology was as follows (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	80,171	$	—	$	—	$	2,543	$	66	$	1,100	$	83,880
Loans collectively evaluated for impairment	10,109,661		5,923,058		2,226,590		3,865,868		46,586		313,475		22,485,238
Total	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	100,676	$	—	$	—	$	2,008	$	—	$	—	$	102,684
Loans collectively evaluated for impairment	9,089,135		5,308,160		2,166,208		3,792,569		48,684		264,903		20,669,659
Total	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343
June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886

We place loans on non-accrual when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, generally when a loan is 90 days past due. When a loan is placed on non-accrual status, all previously accrued and unpaid interest is reversed. Interest income is subsequently recognized on a cash basis as long as the remaining unpaid principal amount of the loan is deemed to be fully collectible. If collectability is questionable, then cash payments are applied to principal. As of both June 30, 2018 and December 31, 2017, none of our non-accrual loans were earning on a cash basis. A loan is placed back on accrual status when both principal and interest are current and it is probable that we will be able to collect all amounts due (both principal and interest) according to the terms of the loan agreement.

15

A loan held for investment is considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due (both principal and interest) according to the terms of the original loan agreement. In accordance with ASC 310, Receivables, we have also included all restructured and formerly restructured loans in our impaired loan totals. The following tables detail our impaired loans, by portfolio class, as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	27,521	$	52,966	$	—	$	12,449	$	133
Energy	16,373		17,549		—		20,393		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,042		1,042		—		1,074		—
Secured by 1-4 family	1,263		1,263		—		211		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	46,199	$	72,820	$	—	$	34,127	$	133
With an allowance recorded:
Commercial
Business loans	$	19,038	$	19,038	$	5,597	$	43,537	$	—
Energy	17,239		18,500		6,175		32,145		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	—		—		—		166		—
Secured by 1-4 family	238		238		73		138		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans with an allowance recorded	$	37,681	$	38,947	$	12,351	$	76,314	$	—
Combined:
Commercial
Business loans	$	46,559	$	72,004	$	5,597	$	55,986	$	133
Energy	33,612		36,049		6,175		52,538		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	1,042		1,042		—		1,240		—
Secured by 1-4 family	1,501		1,501		73		349		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans	$	83,880	$	111,767	$	12,351	$	110,441	$	133

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December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	16,835	$	18,257	$	—	$	22,964	$	—
Energy	21,426		22,602		—		36,579		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,096		1,096		—		2,166		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	39,357	$	41,955	$	—	$	61,709	$	—
With an allowance recorded:
Commercial
Business loans	$	18,645	$	19,020	$	2,544	$	16,960	$	—
Energy	43,770		55,875		21,772		50,867		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	499		499		75		166		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans with an allowance recorded	$	63,327	$	75,807	$	24,417	$	69,068	$	6
Combined:
Commercial
Business loans	$	35,480	$	37,277	$	2,544	$	39,924	$	—
Energy	65,196		78,477		21,772		87,446		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	1,595		1,595		75		2,332		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans	$	102,684	$	117,762	$	24,417	$	130,777	$	6

17

Average impaired loans outstanding during the six months ended June 30, 2018 and 2017 totaled $110.4 million and $149.5 million, respectively.

The table below provides an age analysis of our loans held for investment as of June 30, 2018 (in thousands):

	30-59 Days Past Due		60-89 Days Past Due		Greater Than 90 Days and Accruing(1)		Total Past Due		Non-accrual		Current		Total
Commercial
Business loans	$	14,114	$	17,188	$	6,203	$	37,505	$	45,974	$	8,750,741	$	8,834,220
Energy	24,900		—		—		24,900		33,612		1,297,100		1,355,612
Mortgage finance loans	—		—		—		—		—		5,923,058		5,923,058
Construction
Market risk	489		—		—		489		—		2,151,838		2,152,327
Commercial	—		—		—		—		—		41,991		41,991
Secured by 1-4 family	—		1,610		—		1,610		—		30,662		32,272
Real estate
Market risk	1,337		—		661		1,998		—		2,728,753		2,730,751
Commercial	639		—		—		639		1,042		814,188		815,869
Secured by 1-4 family	2,745		152		493		3,390		1,501		316,900		321,791
Consumer	2		—		—		2		66		46,584		46,652
Leases	—		—		—		—		1,100		313,475		314,575
Total loans held for investment	$	44,226	$	18,950	$	7,357	$	70,533	$	83,295	$	22,415,290	$	22,569,118

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.0 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.

Restructured loans are loans on which, due to the borrower’s financial difficulties, we have granted a concession that we would not otherwise consider for borrowers of similar credit quality. This may include a transfer of real estate or other assets from the borrower, a modification of loan terms, or a combination of the two. Modifications of terms that could potentially qualify as a restructuring include reduction of the contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, a reduction of the face amount of debt or forgiveness of either principal or accrued interest. At June 30, 2018 and December 31, 2017, we did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at June 30, 2018 and December 31, 2017, $9.0 million and $18.8 million, respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates. A loan continues to qualify as restructured until a consistent payment history or change in borrower’s financial condition has been evidenced, generally over no less than twelve months. Assuming that the restructuring agreement specifies an interest rate at the time of the restructuring that is greater than or equal to the rate that we are willing to accept for a new extension of credit with comparable risk, then the loan no longer has to be considered a restructuring if it is in compliance with the modified terms in calendar years after the year of the restructure.

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The following table summarizes the loans that were restructured during the six months endedJune 30, 2018 and 2017 (in thousands):

As of and for the six months ended June 30, 2018
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,370	$	1,370
Total new restructured loans	1	$	1,370	$	1,370
As of and for the six months ended June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	599		672
Total new restructured loans	2	$	1,669	$	1,372

The restructured loans generally include terms to temporarily place loans on interest only, extend the payment terms or reduce the interest rate. We did not forgive any principal on the above loans. The restructuring of the loans did not have a significant impact on our allowance for loan losses at June 30, 2018 or 2017.

The following table provides information on how loans were modified as restructured during the six months ended June 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018		2017
Extended maturity	$	—	$	1,372
Adjusted payment schedule	1,370		—
Total	$	1,370	$	1,372

As of June 30, 2018 and 2017, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

(5) OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO

The table below presents a summary of the activity related to OREO (in thousands):

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Beginning balance	$	9,558		$	18,833		$	11,742		$	18,961
Additions	—			—			—			—
Sales	(32		)	(144		)	(216		)	(272		)
Valuation allowance for OREO	—			—			(2,000		)	—
Ending balance	$	9,526		$	18,689		$	9,526		$	18,689

When foreclosure occurs, the acquired asset is recorded at fair value less selling costs, generally based on appraised value, which may result in partial charge-off of the loan. Subsequent write-downs required for declines in value are recorded through a valuation allowance or taken directly against the asset and charged to other non-interest expense.

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(6) CERTAIN TRANSFERS OF FINANCIAL ASSETS

Through our MCA business, we commit to purchase residential mortgage loans from independent correspondent lenders and deliver those loans into the secondary market via whole loan sales to independent third parties or in securitization transactions to Ginnie Mae and government sponsored entities ("GSEs") such as Fannie Mae and Freddie Mac. We have elected to carry these loans at fair value based on sales commitments, market quotes or pricing models. Gains and losses on the sale of mortgage loans held for sale and changes in the fair value of the loans held for sale and related derivatives are included in other non-interest income on the consolidated statements of income and other comprehensive income. For the six months endedJune 30, 2018 and 2017, losses totaled $7.4 million and $93,000, respectively.

Residential mortgage loans held for sale are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially mitigated through forward sales contracts, which set the price for loans that will be delivered in the next 60 to 90 days.

The table below presents the unpaid principal balance of loans held for sale and related fair values at June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018		December 31, 2017
Outstanding balance(1)	$	1,273,889	$	1,009,271
Fair value(1)	1,275,466		1,007,695
Fair value over/(under) outstanding balance	$	1,577	$	(1,576	)

(1) Does not include $1.3 million and $3.3 million of Small Business Administration ("SBA") loans held for sale carried at lower of cost or market as of June 30, 2018 and December 31, 2017.

No loans held for sale were on non-accrual as of June 30, 2018 or December 31, 2017. At June 30, 2018 and December 31, 2017, we had $27.9 million and $19.7 million, respectively, in outstanding balances of loans held for sale that were 90 days or more past due. The $27.9 million loans held for sale that were 90 days or more past due at June 30, 2018 included $24.1 million in loans guaranteed by U.S. government agencies that were repurchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet. Interest on these past due loans accrues at the debenture rate guaranteed by the U.S. government. Also included in the $27.9 million were $3.1 million in loans that, pursuant to Ginnie Mae servicing guidelines, we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met, and therefore must record as loans held for sale on our balance sheet regardless of whether the repurchase option has been exercised. The comparable balances at December 31, 2017 were no loans repurchased and $19.0 million in loans for which we have the unilateral right but not the obligation to repurchase.

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018			2017
Beginning balance(1)	$	1,011,004		$	968,929
Loans purchased	3,205,483			2,843,690
Payments and loans sold(1)	(2,942,872		)	(2,976,523		)
Change in fair value	3,153			9,921
Ending balance	$	1,276,768		$	846,017

(1) Includes $1.3 million and $3.3 million of SBA loans held for sale carried at lower of cost or market at June 30, 2018 and December 31, 2017.

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We generally retain the right to service the loans sold, creating MSRs which are recorded as assets on our balance sheet. A summary of MSR activity for the six months endedJune 30, 2018 and 2017 is as follows (in thousands):

	Six months ended June 30,
	2018			2017
MSRs:
Balance, beginning of year	$	88,150		$	28,536
Capitalized servicing rights	26,656			37,343
Amortization	(5,288		)	(2,856		)
Sales	(26,742		)	—
Balance, end of period	$	82,776		$	63,023
Valuation allowance:
Balance, beginning of year	$	2,823		$	—
Increase (decrease) in valuation allowance	(2,823		)	—
Balance, end of period	$	—		$	—
MSRs, net(1)	$	82,776		$	63,023
MSRs, fair value	$	90,179		$	64,889

(1) MSRs are reported on the consolidated balance sheets at amortized cost, less a valuation allowance if the fair value of identified strata, determined by interest rates, within the MSR portfolio are determined to have a fair value that is less than amortized cost.

We completed a sale of Ginnie Mae MSRs in the first quarter of 2018. In anticipation of this sale, the fair value of the MSRs at December 31, 2017 was adjusted, resulting in a $2.8 million impairment charge taken in the fourth quarter of 2017.

At June 30, 2018 and December 31, 2017, our servicing portfolio of residential mortgage loans had an outstanding principal balance of $7.1 billion and $7.0 billion, respectively. In connection with the servicing of these loans, we hold deposits in the names of the investors who own the loans representing escrow funds for taxes and insurance, as well as collections in transit to the investors. These escrow funds are segregated and held in separate non-interest-bearing accounts at the Bank. These deposits, included in total non-interest-bearing deposits on the consolidated balance sheets, were $84.5 million at June 30, 2018 and $73.4 million at December 31, 2017.

The estimated fair value of the MSR assets is obtained from an independent third party and reviewed by management on a quarterly basis. MSRs typically do not trade in an active, open market with readily observable prices; as such, the fair value of MSRs is determined using a discounted cash flow model to calculate the present value of the estimated future net servicing income. The assumptions utilized in the discounted cash flow model are based on market data for comparable assets, where available. Each quarter, management and the independent third party discuss the key assumptions used in the discounted cash flow model and make adjustments as necessary to estimate the fair value of the MSRs. As of June 30, 2018 and December 31, 2017, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2018		December 31, 2017
Average discount rates	9.61	%	9.90	%
Expected prepayment speeds	9.04	%	9.99	%
Weighted average life, in years	7.5		7.0

A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table (in thousands):

	June 30, 2018			December 31, 2017
50 bp adverse change in prepayment speed	$	(12,184	)	$	(11,896	)
100 bp adverse change in prepayment speed	(24,683		)	(28,226		)

These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined with confidence because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair

21

value is calculated while holding other assumptions constant. In reality, changes in one factor may be correlated with changes in other factors, which could impact the sensitivity analysis as presented.

In conjunction with the sale and securitization of loans held for sale, we may be exposed to liability resulting from recourse agreements and repurchase agreements. If it is determined subsequent to our sale of a loan that the loan sold is in breach of the representations or warranties made in the applicable sale agreement, we may have an obligation to either (a) repurchase the loan for the unpaid principal balance, accrued interest and related advances, (b) indemnify the purchaser against any loss it suffers or (c) make the purchaser whole for the economic benefits of the loan.

Our repurchase, indemnification and make whole obligations vary based upon the terms of the applicable agreements, the nature of the asserted breach and the status of the mortgage loan at the time a claim is made. We establish reserves for estimated losses of this nature inherent in the origination of mortgage loans by estimating the losses inherent in the population of all loans sold based on trends in claims and actual loss severities experienced. The reserve includes accruals for probable contingent losses in addition to those identified in the pipeline of claims received. The estimation process is designed to include amounts based on any actual losses experienced from actual repurchase activity.

Our estimated exposure related to loans previously sold and currently held for sale was $1.5 million at June 30, 2018 and $1.3 million at December 31, 2017 and is recorded in other liabilities in the consolidated balance sheets. We had $148,000 in losses due to repurchase, indemnification and make-whole obligations during the six months endedJune 30, 2018 and $7,000 in losses during the six months endedJune 30, 2017.

(7) FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

The Bank is a 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 that involve varying degrees of credit risk in excess of the amount recognized in the consolidated balance sheets. The Bank’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of these instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower.

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. Since many of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer’s credit-worthiness on a case-by-case basis.

Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

The table below summarizes our off-balance sheet financial instruments whose contract amounts represented credit risk (in thousands):

	June 30, 2018		December 31, 2017
Commitments to extend credit	$	7,254,475	$	6,957,847
Standby letters of credit	244,962		230,958

At June 30, 2018 and December 31, 2017, we had $10.5 million and $9.1 million, respectively, in allowance for off-balance sheet credit losses related to these off-balance sheet commitments recorded in other liabilities in the consolidated balance sheets.

(8) REGULATORY MATTERS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory (and possibly additional discretionary) actions by regulators that, if undertaken, could have a direct material adverse effect on the Company’s and the Bank’s 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 the Company’s and the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

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The Basel III regulatory capital framework (the "Basel III Capital Rules") adopted by U.S. federal regulatory authorities, among other things, (i) establishes the capital measure called "Common Equity Tier 1" ("CET1"), (ii) specifies that Tier 1 capital consist of CET1 and "Additional Tier 1 Capital" instruments meeting stated requirements, (iii) requires that most deductions/adjustments to regulatory capital measures be made to CET1 and not to other components of capital and (iv) defines the scope of the deductions/adjustments to the capital measures. The Basel III Capital Rules became effective for us on January 1, 2015 with certain transition provisions fully phasing in over a period ending on January 1, 2019.

Additionally, the Basel III Capital Rules require that we maintain a capital conservation buffer with respect to each of CET1, Tier 1 and total capital to risk-weighted assets, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. The capital conservation buffer is subject to a three year phase-in period that began on January 1, 2016 and will be fully phased in on January 1, 2019 at 2.5%. The required phase-in capital conservation buffer during 2018 is 1.875% and was 1.25% during 2017. A financial institution with a conservation buffer of less than the required amount is subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers.

Quantitative measures established by these regulations to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of CET1, Tier 1 and total capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of June 30, 2018, that the Company and the Bank met all capital adequacy requirements to which they are subject.

Financial institutions are categorized as well capitalized or adequately capitalized, based on minimum total risk-based, Tier 1 risk-based, CET1 and Tier 1 leverage ratios. As shown in the table below, the Company’s capital ratios exceeded the regulatory definition of adequately capitalized as of June 30, 2018 and December 31, 2017. Based upon the information in its most recently filed call report, the Bank met the capital ratios necessary to be well capitalized. The regulatory authorities can apply changes in classification of assets and such changes may retroactively subject the Company to changes in capital ratios. Any such changes could result in reducing one or more capital ratios below well-capitalized status. In addition, a change may result in imposition of additional assessments by the FDIC or could result in regulatory actions that could have a material adverse effect on our financial condition and results of operations.

Because our Bank had less than $15.0 billion in total consolidated assets as of December 31, 2009, we are allowed to continue to classify our trust preferred securities, all of which were issued prior to May 19, 2010, as Tier 1 capital.

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The table below summarizes our actual and required capital ratios under the Basel III Capital Rules:

	Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount	Ratio
As of June 30, 2018:
CET1
Company	$	2,173,815	8.32	%	$	1,665,009	6.38	%	$	1,828,245	7.00	%	N/A	N/A
Bank	2,178,607		8.35	%	1,662,918		6.38	%	1,825,950		7.00	%	1,695,525	6.50	%
Total capital (to risk-weighted assets)
Company	2,902,789		11.11	%	2,579,132		9.88	%	2,742,368		10.50	%	N/A	N/A
Bank	2,749,018		10.54	%	2,575,893		9.88	%	2,738,925		10.50	%	2,608,500	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,431,650		9.31	%	2,056,776		7.88	%	2,220,012		8.50	%	N/A	N/A
Bank	2,336,442		8.96	%	2,054,193		7.88	%	2,217,225		8.50	%	2,086,800	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,431,650		9.89	%	983,476		4.00	%	983,476		4.00	%	N/A	N/A
Bank	2,336,442		9.51	%	982,989		4.00	%	982,989		4.00	%	1,228,736	5.00	%
As of December 31, 2017:
CET1
Company	$	2,033,830	8.45	%	$	1,384,448	5.75	%	$	1,685,464	7.00	%	N/A	N/A
Bank	1,992,152		8.28	%	1,383,475		5.75	%	1,684,231		7.00	%	1,563,929	6.50	%
Total capital (to risk-weighted assets)
Company	2,768,153		11.50	%	2,227,221		9.25	%	2,528,196		10.50	%	N/A	N/A
Bank	2,567,961		10.67	%	2,225,591		9.25	%	2,526,347		10.50	%	2,406,044	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,293,016		9.52	%	1,745,659		7.25	%	2,046,635		8.50	%	N/A	N/A
Bank	2,151,338		8.94	%	1,744,382		7.25	%	2,045,138		8.50	%	1,924,835	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,293,016		9.15	%	1,002,494		4.00	%	1,002,494		4.00	%	N/A	N/A
Bank	2,151,338		8.59	%	1,002,144		4.00	%	1,002,144		4.00	%	1,252,680	5.00	%

(1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, it should be noted that the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum.

Our mortgage finance loan volumes can increase significantly at month end, causing a meaningful difference between ending balance and average balance for any period. At June 30, 2018, our total mortgage finance loans were $5.9 billion compared to the average for the three months ended June 30, 2018 of $4.9 billion. As CET1, Tier 1 and total capital ratios are calculated using quarter-end risk-weighted assets and our mortgage finance loans are 100% risk-weighted (excluding MCA mortgage loans held for sale, which receive lower risk weights), the quarter-end fluctuation in these balances can significantly impact our reported ratios. Due to the actual risk profile and liquidity of this asset class, we manage capital allocated to mortgage finance loans based on changing trends in average balances and do not believe that the quarter-end balance is representative of risk characteristics that would justify higher allocations. However, we continue to monitor our capital allocation to confirm that all capital levels remain above well-capitalized levels.

Dividends that may be paid by subsidiary banks are routinely restricted by various regulatory authorities. The amount that can be paid in any calendar year without prior approval of the Bank’s regulatory agencies cannot exceed the lesser of the net profits (as defined) for that year plus the net profits for the preceding two calendar years, or retained earnings. The Basel III Capital

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Rules further limit the amount of dividends that may be paid by our Bank. No dividends were declared or paid on our common stock during the six months endedJune 30, 2018 or 2017.

(9) STOCK-BASED COMPENSATION

We have long-term incentive plans under which stock-based compensation awards are granted to employees and directors by the board of directors, or its designated committee. Grants are subject to vesting requirements and may include, among other things, nonqualified stock options, stock appreciation rights ("SARs"), restricted stock units ("RSUs"), restricted stock and performance units, or any combination thereof. There are 2,550,000 total shares authorized for grant under the plans.

The table below summarizes our stock-based compensation expense for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Stock-settled awards:
SARs	$	43	$	74	$	93	$	146
RSUs	2,078		1,714		3,974		3,307
Restricted stock	13		4		24		8
Cash-settled performance units	3,092		2,603		7,106		5,493
Total	$	5,226	$	4,395	$	11,197	$	8,954

(in thousands)	June 30, 2018
Unrecognized compensation expense related to unvested stock-settled awards	$	15,335
Weighted average period over which expense is expected to be recognized, in years	2.9

(10) INCOME TAXES

The Tax Cuts and Jobs Act (the "Tax Act") enacted in December 2017 reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result of the Tax Act, we re-measured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Tax Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded in 2017 related to the re-measurement of our deferred tax asset was $17.6 million, and no further adjustments were made during the six months ended June 30, 2018.

The reconciliation of our total effective income tax rate to the U.S. federal statutory tax rate for the six months ended June 30, 2018 and 2017 is as follows:

	Six months ended June 30,
	2018		2017
U.S. statutory rate	21	%	35	%
State taxes	1	%	1	%
Non-deductible expenses	1	%	—	%
Non-taxable income	(1	)%	(1	)%
Other	(1	)%	(1	)%
Effective tax rate	21	%	34	%

(11) FAIR VALUE DISCLOSURES

We determine the fair market values of our assets and liabilities measured at fair value on a recurring and nonrecurring basis using the fair value hierarchy as prescribed in ASC 820, Fair Value Measurements and Disclosures. The standard describes three levels of inputs that may be used to measure fair value as provided below.

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Level 1 Quoted prices in active markets for identical assets or liabilities. This category includes the assets and liabilities related to our non-qualified deferred compensation plan where values are based on quoted market prices for identical equity securities in an active market.

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets include agency mortgage-backed debt securities and Community Reinvestment Act funds. This category also includes loans held for sale and derivative assets and liabilities where values are obtained from independent pricing services using observable market data.

Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair values requires significant management judgment or estimation. This category includes certain loans held for sale for which fair values are determined using third party pricing models. This category also includes impaired loans and OREO where collateral values have been based on third party appraisals; however, comparative sales data typically used in appraisals may be unavailable or more subjective in certain markets due to lack of market activity.

Assets and liabilities measured at fair value at June 30, 2018 and December 31, 2017 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2018	Level 1		Level 2		Level 3
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	8,785	$	—
Equity securities(1)(2)	8,711		6,912		—
Loans held for sale (3)	—		1,247,537		27,929
Loans held for investment(4)(6)	—		—		22,165
OREO(5)(6)	—		—		9,526
Derivative assets(7)	—		21,740		—
Derivative liabilities(7)	—		25,516		—
Non-qualified deferred compensation plan liabilities (8)	9,192		—		—
December 31, 2017
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	10,945	$	—
Equity securities(1)(2)	5,460		7,106		—
Loans held for sale(3)	—		1,007,695		—
Loans held for investment(4)(6)	—		—		21,216
OREO(5)(6)	—		—		11,742
Derivative assets(7)	—		16,719		—
Derivative liabilities(7)	—		17,377		—
Non-qualified deferred compensation plan liabilities (8)	5,587		—		—

(1) Securities are measured at fair value on a recurring basis, generally monthly.

(2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.

(3) Loans held for sale, excluding SBA loans which are carried at lower of cost or market, are measured at fair value on a recurring basis, generally monthly.

(4) Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

(5) OREO is transferred from loans to OREO at fair value less selling costs.

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(6) Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.

(7) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.

(8) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.

Level 3 Valuations

Financial instruments are considered Level 3 when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 financial instruments include those for which the determination of fair value requires significant management judgment or estimation. Currently, we measure the fair value of certain loans held for sale using third party pricing models on a recurring basis, and measure certain collateral dependent impaired loans and OREO on a nonrecurring basis as described below.

Loans held for sale

The following table presents a reconciliation for the three and six months ended June 30, 2018 of loans held for sale measured at fair value on a recurring basis using Level 3 inputs (in thousands):

								Net Realized/Unrealized Gains (Losses)
								Recorded in Earnings(1)
	Balance at Beginning of Period		Purchases / Additions		Sales / Reductions			Realized			Unrealized		Balance at End of Period
Three months ended June 30, 2018
Loans held for sale	$	34,251	$	1,437	$	(7,988	)	$	161		$	68	$	27,929
Six months ended June 30, 2018
Loans held for sale	$	—	$	37,529	$	(7,988	)	$	(1,680	)	$	68	$	27,929

(1) Recorded in other non-interest income.

The fair value of loans held for sale using Level 3, or unobservable inputs, include loans that cannot be sold through normal sale channels and thus require significant management judgment or estimation when determining the fair value. The fair value of such loans is generally based upon quoted prices of comparable loans with a liquidity discount applied. At June 30, 2018, the fair value of these loans was calculated using a weighted-average discounted price of 94.3%.

Loans held for investment

At June 30, 2018 and December 31, 2017, certain impaired loans held for investment were reported at fair value through a specific allocation of the allowance for loan losses based upon the fair value of the underlying collateral. The $22.2 million fair value of loans held for investment at June 30, 2018 reported above includes impaired loans held for investment with a carrying value of $30.1 million that were reduced by specific allowance allocations totaling $7.9 million based on collateral valuations utilizing Level 3 valuation inputs. The $21.2 million fair value of loans held for investment at December 31, 2017 reported above includes impaired loans with a carrying value of $32.2 million that were reduced by specific valuation allowance allocations totaling $11.0 million based on collateral valuations utilizing Level 3 valuation inputs. Fair values were based on third party appraisals, which are Level 3 valuation inputs.

OREO

Certain foreclosed assets, upon initial recognition, are recorded at fair value less estimated selling costs. At June 30, 2018 and December 31, 2017, OREO had a carrying value of $11.5 million and $11.7 million, respectively, net of a $2.0 million specific valuation allowance at June 30, 2018 and no valuation allowance at December 31, 2017. The fair value of OREO was computed based on third party appraisals, which are Level 3 valuation inputs.

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Fair Value of Financial Instruments

GAAP requires disclosure of fair value information about financial instruments, whether or not recognized on the balance sheet, for which it is practical to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. This disclosure does not and is not intended to represent the fair value of the Company.

A summary of the carrying amounts and estimated fair values of financial instruments is as follows (in thousands):

	June 30, 2018				December 31, 2017
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	3,462,794	$	3,462,794	$	2,905,591	$	2,905,591
Investment securities	8,711		8,711		5,460		5,460
Level 2 inputs:
Investment securities	15,697		15,697		18,051		18,051
Loans held for sale	1,248,839		1,248,839		1,011,004		1,011,004
Derivative assets	21,740		21,740		16,719		16,719
Level 3 inputs:
Loans held for sale	27,929		27,929		—		—
Loans held for investment, net	22,280,683		22,258,008		20,489,757		20,480,802
Financial liabilities:
Level 2 inputs:
Federal funds purchased	510,221		510,221		359,338		359,338
Customer repurchase agreements	10,628		10,628		5,702		5,702
Other borrowings	4,000,000		4,000,000		2,800,000		2,800,000
Subordinated notes	281,586		283,268		281,406		285,485
Derivative liabilities	25,516		25,516		17,377		17,377
Level 3 inputs:
Deposits	20,334,871		21,258,150		19,123,180		19,124,121
Trust preferred subordinated debentures	113,406		113,406		113,406		113,406

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

Investment Securities

Within the investment securities portfolio, we hold equity securities related to our non-qualified deferred compensation plan which are valued using quoted market prices for identical equity securities in an active market. These financial instruments are classified as Level 1 assets in the fair value hierarchy. The fair value of the remaining investment portfolio is based on prices obtained from independent pricing services which are based on quoted market prices for the same or similar securities, and these financial instruments are characterized as Level 2 assets in the fair value hierarchy. We have obtained documentation from our primary pricing service regarding their processes and controls applicable to pricing investment securities. In addition, on a quarterly basis we independently verify the prices that we receive from the service provider using two additional independent pricing sources. Any significant differences are investigated and resolved.

Loans Held for Sale

Fair value for loans held for sale is derived from quoted market prices for similar loans, in which case they are characterized as Level 2 assets in the fair value hierarchy, or is derived from third party pricing models, in which case they are characterized as Level 3 assets in the fair value hierarchy.

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Derivatives

The estimated fair value of interest rate swaps and caps is obtained from independent pricing services based on quoted market prices for similar derivative contracts and these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. On a quarterly basis, we independently verify the fair value using an additional independent pricing source. Any significant differences are investigated and resolved. Foreign currency forward contracts are valued based upon quoted market prices obtained from independent pricing services for similar derivative contracts. As such, these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. The derivative instruments related to the loans held for sale portfolio include loan purchase commitments and forward sales commitments. Loan purchase commitments are valued based upon the fair value of the underlying mortgage loans to be purchased, which is based on observable market data for similar loans. Forward sales commitments are valued based upon quoted market prices from brokers. As such, these loan purchase commitments and forward sales commitments are characterized as Level 2 assets or liabilities in the fair value hierarchy.

(12) DERIVATIVE FINANCIAL INSTRUMENTS

The fair value of derivative positions outstanding is included in accrued interest receivable and other assets and other liabilities in the accompanying consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement.

We enter into interest rate derivative positions that are not designated as hedging instruments. These derivative positions relate to transactions in which we enter into an interest rate swap, cap and/or floor with a customer while at the same time entering into an offsetting interest rate swap, cap and/or floor with another financial institution. In connection with each swap transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate. Because we act as an intermediary for our customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on our results of operations.

We also enter into foreign currency forward contracts that are not designated as hedging instruments. These derivative instruments relate to transactions in which we enter into a contract with a customer to buy or sell a foreign currency at a future date for a specified price while at the same time entering into an offsetting contract with a financial institution to buy or sell the same currency at the same future date for a specified price. These transactions allow our customers to manage their exposure to foreign currency exchange rate fluctuations. Because we act as an intermediary for our customer, changes in the fair value of the underlying derivative instruments substantially offset each other and do not have a material impact on our results of operations.

We also enter into loan purchase commitment contracts with mortgage originators to purchase residential mortgage loans at a future date, as well as forward sales commitment contracts to sell residential mortgage loans at a future date as part of our MCA program. The objective of these transactions is to mitigate our exposure to interest rate risk associated with the purchase of mortgage loans held for sale. Any changes in fair value are recorded in other non-interest expense in the consolidated statements of income and other comprehensive income.

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The notional amounts and estimated fair values of interest rate derivative positions outstanding at June 30, 2018 and December 31, 2017 are presented in the following tables (in thousands):

	June 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount		Asset Derivative			Liability Derivative			Notional Amount		Asset Derivative			Liability Derivative
Non-hedging interest rate derivatives:
Financial institution counterparties:
Commercial loan/lease interest rate swaps	$	1,514,867	$	17,079		$	6,239		$	1,393,764	$	4,736		$	15,482
Commercial loan/lease interest rate caps	245,667		992			18			242,700		421			7
Foreign currency forward contracts	53,871		1,794			58			2,466		4			69
Customer counterparties:
Commercial loan/lease interest rate swaps	1,514,867		6,239			17,079			1,393,764		15,482			4,736
Commercial loan/lease interest rate caps	245,667		18			992			242,700		7			421
Foreign currency forward contracts	53,871		58			1,794			2,466		69			4
Economic hedging interest rate derivatives:
Loan purchase commitments	204,057		1,089			21			253,815		635			190
Forward sales commitments	1,361,500		—			4,844			1,086,224		—			1,103
Gross derivatives			27,269			31,045					21,354			22,012
Offsetting derivative assets/liabilities			(5,529		)	(5,529		)			(4,635		)	(4,635		)
Net derivatives included in the consolidated balance sheets			$	21,740		$	25,516				$	16,719		$	17,377

The weighted average received and paid interest rates for interest rate swaps outstanding at June 30, 2018 and December 31, 2017 were as follows:

	June 30, 2018 Weighted Average Interest Rate				December 31, 2017 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.85	%	4.17	%	3.59	%	4.34	%

The weighted average strike rate for outstanding interest rate caps was 2.38% at June 30, 2018 and 2.40% at December 31, 2017.

Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In some cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceeds a nominal amount. Our credit exposure associated with these instruments, net of any collateral pledged, was approximately $12.9 million at June 30, 2018 and approximately $16.7 million at December 31, 2017. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values, as well as for changes in the value of forward sales commitments. At June 30, 2018, we had pledged to counterparties $6.7 million in cash collateral for these derivatives, of which $2.8 million was included in interest-bearing deposits in other banks and $3.9 million was included in accrued interest receivable and other assets, and counterparties had pledged to us $11.1 million in cash collateral included in interest-bearing deposit liabilities. At December 31, 2017, we had pledged to counterparties $15.2 million in cash collateral for these derivatives, of which $14.0 million was included in interest-bearing deposits in other banks and $1.2 million was included in accrued interest receivable and other assets.

We also enter into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which we are either a participant or a lead bank. The risk participation agreements entered into by us as a participant bank provide credit protection to the financial institution counterparty should the borrower fail to perform on its interest rate derivative contract with that financial institution. We are party to 14 risk participation agreements where we are a participant

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bank having a notional amount of $130.2 million at June 30, 2018, compared to 15 risk participation agreements having a notional amount of $157.1 million at December 31, 2017. The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $157,000 at June 30, 2018 and $221,000 at December 31, 2017. The fair value of these exposures was insignificant to the consolidated financial statements at both June 30, 2018 and December 31, 2017. Risk participation agreements entered into by us as the lead bank provide credit protection to us should the borrower fail to perform on its interest rate derivative contract with us. We are party to 11 risk participation agreements where we are the lead bank having a notional amount of $126.5 million at June 30, 2018, compared to 10 agreements having a notional amount of $86.3 million at December 31, 2017.

(13) NEW ACCOUNTING PRONOUNCEMENTS

ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326)" ("ASU 2016-13") requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") model to estimate its lifetime "expected credit loss" and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. ASU 2016-13 will be effective for us on January 1, 2020. We are evaluating the impact adoption of ASU 2016-13 will have on our consolidated financial statements and disclosures. While we are currently unable to reasonably estimate the impact of adopting ASU 2016-13, we expect that the impact of adoption could be significantly influenced by the composition, characteristics and quality of our loan portfolio as well as the prevailing economic conditions and forecasts as of the adoption date. As part of our evaluation process, we have established a steering committee and working group that includes individuals from various functional areas to assess processes, portfolio segmentation, systems requirements and needed resources to implement this new accounting standard.

ASU 2016-02 "Leases (Topic 842)" ("ASU 2016-02") requires that lessees and lessors recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. ASU 2016-02 will be effective for us on January 1, 2019. ASU 2016-02 provides for a modified retrospective transition approach requiring lessees to recognize and measure leases on the balance sheet at the beginning of the earliest period presented with the option to elect certain practical expedients. We are currently implementing a third party software solution to assist with the accounting under the new standard. Our operating leases relate primarily to office space and bank branches. We expect recorded assets and liabilities to increase upon adoption of the standard as it relates to operating leases in which we are the lessee.

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QUARTERLY FINANCIAL SUMMARIES – UNAUDITED

Consolidated Daily Average Balances, Average Yields and Rates

(In thousands)

	For the three months ended   June 30, 2018						For the three months ended   June 30, 2017
	Average Balance		Revenue/ Expense		Yield/ Rate		Average Balance		Revenue/ Expense		Yield/ Rate
Assets
Investment securities – taxable	$	24,514	$	193	3.15	%	$	65,049	$	287	1.77	%
Federal funds sold and securities purchased under resale agreements	166,613		745		1.79	%	174,264		434		1.00	%
Interest-bearing deposits in other banks	1,498,474		6,467		1.73	%	2,250,330		5,824		1.04	%
Loans held for sale	1,516,047		17,026		4.50	%	845,623		8,235		3.91	%
Loans held for investment, mortgage finance	4,898,411		47,056		3.85	%	3,805,831		33,399		3.52	%
Loans held for investment(1)(2)	15,883,317		216,755		5.47	%	13,718,739		161,369		4.72	%
Less reserve for loan losses	189,238		—		—		170,957		—		—
Loans held for investment, net	20,592,490		263,811		5.14	%	17,353,613		194,768		4.50	%
Total earning assets	23,798,138		288,242		4.86	%	20,688,879		209,548		4.06	%
Cash and other assets	808,099						632,097
Total assets	$	24,606,237					$	21,320,976
Liabilities and Stockholders’ Equity
Transaction deposits	$	2,889,834	$	10,295	1.43	%	$	2,008,872	$	2,893	0.58	%
Savings deposits	7,784,937		25,454		1.31	%	6,952,317		12,940		0.75	%
Time deposits	979,735		3,858		1.58	%	455,542		700		0.62	%
Total interest-bearing deposits	11,654,506		39,607		1.36	%	9,416,731		16,533		0.70	%
Other borrowings	2,113,391		10,149		1.93	%	1,456,737		3,627		1.00	%
Subordinated notes	281,527		4,191		5.97	%	281,167		4,191		5.98	%
Trust preferred subordinated debentures	113,406		1,193		4.22	%	113,406		881		3.12	%
Total interest-bearing liabilities	14,162,830		55,140		1.56	%	11,268,041		25,232		0.90	%
Demand deposits	8,017,578						7,863,402
Other liabilities	100,074						102,653
Stockholders’ equity	2,325,755						2,086,880
Total liabilities and stockholders’ equity	$	24,606,237					$	21,320,976
Net interest income(2)			$	233,102					$	184,316
Net interest margin					3.93	%					3.57	%
Net interest spread					3.30	%					3.16	%
Loan spread(3)					4.18	%					4.04	%

(1) The loan averages include non-accrual loans and are stated net of unearned income.

(2) Taxable equivalent rates used where applicable.

(3) Yield on loans, net of reserves, less funding cost including all deposits and borrowed funds.

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	For the six months ended June 30, 2018						For the six months ended June 30, 2017
	Average Balance		Revenue/ Expense		Yield/ Rate		Average Balance		Revenue/ Expense		Yield/ Rate
Assets
Investment securities – taxable	$	24,186	$	399	3.32	%	$	48,569	$	511	2.12	%
Investment securities – non-taxable(2)	—		—		—	%	111		3		4.85	%
Federal funds sold and securities purchased under resale agreements	213,865		1,790		1.69	%	225,303		964		0.86	%
Interest-bearing deposits in other banks	1,898,484		15,221		1.62	%	2,778,360		12,391		0.90	%
Loans held for sale	1,352,728		29,561		4.41	%	954,368		17,770		3.75	%
Loans held for investment, mortgage finance	4,500,414		84,418		3.78	%	3,284,594		56,504		3.47	%
Loans held for investment(1)(2)	15,655,585		412,088		5.31	%	13,351,681		306,387		4.63	%
Less reserve for loan losses	186,752		—		—		170,143		—		—
Loans held for investment, net	19,969,247		496,506		5.01	%	16,466,132		362,891		4.44	%
Total earning assets	23,458,510		543,477		4.67	%	20,472,843		394,530		3.89	%
Cash and other assets	802,831						619,500
Total assets	$	24,261,341					$	21,092,343
Liabilities and Stockholders’ Equity
Transaction deposits	$	2,841,662	$	18,946	1.34	%	$	2,008,638	$	5,086	0.51	%
Savings deposits	7,883,051		47,412		1.21	%	6,970,929		23,423		0.68	%
Time deposits	744,363		4,951		1.34	%	441,733		1,317		0.60	%
Total interest-bearing deposits	11,469,076		71,309		1.25	%	9,421,300		29,826		0.64	%
Other borrowings	1,918,734		16,798		1.77	%	1,395,551		5,900		0.85	%
Subordinated notes	281,482		8,382		6.00	%	281,122		8,382		6.01	%
Trust preferred subordinated debentures	113,406		2,220		3.95	%	113,406		1,711		3.04	%
Total interest-bearing liabilities	13,782,698		98,709		1.44	%	11,211,379		45,819		0.82	%
Demand deposits	8,082,290						7,706,243
Other liabilities	105,356						110,222
Stockholders’ equity	2,290,997						2,064,499
Total liabilities and stockholders’ equity	$	24,261,341					$	21,092,343
Net interest income(2)			$	444,768					$	348,711
Net interest margin					3.82	%					3.43	%
Net interest spread					3.23	%					3.07	%
Loan spread(3)					4.15	%					4.02	%

(1) The loan averages include non-accrual loans and are stated net of unearned income.

(2) Taxable equivalent rates used where applicable.

(3) Yield on loans, net of reserves, less funding cost including all deposits and borrowed funds.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

Certain statements and financial analysis contained in this report that are not historical facts are forward-looking statements made pursuant to the safe harbor provisions of federal securities laws. Forward-looking statements may also be contained in our future filings with SEC, in press releases and in oral and written statements made by us or with our approval that are not statements of historical fact. These forward-looking statements are based on our beliefs, assumptions and expectations of our future performance taking into account all information currently available to us. Words such as “believes,” “expects,” “estimates,” “anticipates,” “plans,” “goals,” “objectives,” “expects,” “intends,” “seeks,” “likely,” “targeted,” “continue,” “remain,” “will,” “should,” “may” and other similar expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements.

Forward-looking statements may include, among other things, statements about the credit quality of our loan portfolio, economic conditions, including the continued impact on our customers from declines and volatility in oil and gas prices, expectations regarding rates of default or loan losses, volatility in the mortgage industry, our business strategies and our expectations about future financial performance, future growth and earnings, the appropriateness of our allowance for loan losses and provision for credit losses, the impact of increased regulatory requirements on our business, increased competition, interest rate risk, new lines of business, new product or service offerings and new technologies.

Forward-looking statements are subject to various risks and uncertainties, which change over time, are based on management’s expectations and assumptions at the time the statements are made and are not guarantees of future results. Important factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, the following:

• Deterioration of the credit quality of our loan portfolio or declines in the value of collateral related to external factors such as commodity prices, real estate values or interest rates, increased default rates and loan losses or adverse changes in the industry concentrations of our loan portfolio.

• Changing economic conditions or other developments adversely affecting our commercial, entrepreneurial and professional customers.

• Changes in the value of commercial and residential real estate securing our loans or in the demand for credit to support the purchase and ownership of such assets.

• Adverse economic conditions and other factors affecting our middle market customers and their ability to continue to meet their loan obligations.

• Unanticipated effects from the Tax Act may limit its benefits or adversely impact our business, which could include decreased demand for borrowing by our middle market customers or increased price competition that offsets the benefits of decreased federal income tax expense.

• The failure to correctly assess and model the assumptions supporting our allowance for loan losses, causing it to become inadequate in the event of deteriorations in loan quality and increases in charge-offs.

• Changes in the U.S. economy in general or the Texas economy specifically resulting in deterioration of credit quality, increases in non-performing assets or charge-offs or reduced demand for credit or other financial services we offer, including the effects from declines in the level of drilling and production related to the continued volatility in oil and gas prices.

• Adverse changes in economic or market conditions, in Texas, the United States or internationally, that could affect the credit quality of our loan portfolio or our operating performance.

• Unexpected market conditions or regulatory changes that could cause access to capital market transactions and other sources of funding to become more difficult to obtain on terms and conditions that are acceptable to us.

• The inadequacy of our available funds to meet our deposit, debt and other obligations as they become due, or our failure to maintain our capital ratios as a result of adverse changes in our operating performance or financial condition, or changes in applicable regulations or regulator interpretation of regulations impacting our business or the characterization or risk weight of our assets.

• The failure to effectively balance our funding sources with cash demands by depositors and borrowers.

• The failure to manage information systems risk or to prevent cyber-attacks against us, our customers or our third party vendors, or to manage risks from disruptions or security breaches affecting us, our customers or our third party vendors.

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• The failure to effectively manage our interest rate risk resulting from unexpectedly large or sudden changes in interest rates or rate or maturity imbalances in our assets and liabilities, and potential adverse effects to our borrowers including their inability to repay loans with increased interest rates.

• Legislative and regulatory changes imposing further restrictions and costs on our business, a failure to remain well capitalized or well managed status or regulatory enforcement actions against us, and uncertainty related to future implementation and enforcement of regulatory requirements resulting from the current political environment.

• The failure to successfully execute our business strategy, which may include expanding into new markets, developing and launching new lines of business or new products and services within the expected timeframes and budgets or to successfully manage the risks related to the development and implementation of these new businesses, products or services.

• The failure to attract and retain key personnel or the loss of key individuals or groups of employees.

• Increased or more effective competition from banks and other financial service providers in our markets.

• Structural changes in the markets for origination, sale and servicing of residential mortgages.

• Uncertainty in the pricing of mortgage loans that we purchase, and later sell or securitize, as well as competition for the MSRs related to these loans and related interest rate risk or price risk resulting from retaining MSRs, and the potential effects of higher interest rates on our MCA loan volumes.

• Material failures of our accounting estimates and risk management processes based on management judgment, or the supporting analytical and forecasting models.

• Failure of our risk management strategies and procedures, including failure or circumvention of our controls.

• Credit risk resulting from our exposure to counterparties.

• An increase in the incidence or severity of fraud, illegal payments, security breaches and other illegal acts impacting our Bank and our customers.

• The failure to maintain adequate regulatory capital to support our business.

• Unavailability of funds obtained from borrowing or capital transactions or from our Bank to fund our obligations.

• Incurrence of material costs and liabilities associated with legal and regulatory proceedings and related matters with respect to the financial services industry, including those directly involving us or our Bank.

• Environmental liability associated with properties related to our lending activities.

• Severe weather, natural disasters, acts of war or terrorism and other external events.

Actual outcomes and results may differ materially from what is expressed in our forward-looking statements and from our historical financial results due to the factors discussed elsewhere in this report or disclosed in our other SEC filings. Forward-looking statements included herein speak only as of the date hereof and should not be relied upon as representing our expectations or beliefs as of any date subsequent to the date of this report. Except as required by law, we undertake no obligation to revise any forward-looking statements contained in this report, whether as a result of new information, future events or otherwise. The factors discussed herein are not intended to be a complete summary of all risks and uncertainties that may affect our businesses. For a more detailed discussion of these and other factors that may affect our business, see "Risk Factors" in the 2017 Form 10-K and other filings we have made with the SEC. Though we strive to monitor and mitigate risk, we cannot anticipate all potential economic, operational and financial developments that may adversely impact our operations and our financial results. Forward-looking statements should not be viewed as predictions and should not be the primary basis upon which investors evaluate an investment in our securities.

Overview of Our Business Operations

We commenced our banking operations in December 1998. An important aspect of our growth strategy has been our ability to service and manage effectively a large number of loans and deposit accounts in multiple markets in Texas, as well as several lines of business serving a regional or national clientele of commercial borrowers. Accordingly, we have created an operations infrastructure sufficient to support our lending and banking operations that we continue to build out as needed to serve a larger customer base and specialized industries.

The following discussion and analysis presents the significant factors affecting our financial condition as of June 30, 2018 and December 31, 2017 and results of operations for the three and six month periods ended June 30, 2018 and 2017. This

35

discussion should be read in conjunction with our consolidated financial statements and notes to the financial statements appearing in Part I, Item 1 of this report.

Results of Operations

Summary of Performance

We reported net income of $71.4 million and net income available to common stockholders of $69.0 million, or $1.38 per diluted common share, for the second quarter of 2018 compared to net income of $51.1 million and net income available to common stockholders of $48.7 million, or $0.97 per diluted common share, for the second quarter of 2017. Return on average common equity (“ROE”) was 12.72% and return on average assets ("ROA") was 1.16% for the second quarter of 2018, compared to 10.08% and 0.96%, respectively, for the second quarter of 2017. The increase in ROE and ROA for the quarter resulted primarily from an increase in net interest income and decrease in income tax expense caused by a decrease in income tax rates as a result of the Tax Cuts and Jobs Act (the "Tax Act") which became effective on January 1, 2018, offset by increases in the provision for credit losses and non-interest expense.

Net income and net income available to common stockholders for the six months ended June 30, 2018 totaled $143.4 million and $138.5 million, respectively, or $2.76 per diluted common share, compared to net income and net income available to common stockholders of $93.6 million and $88.8 million, respectively, or $1.77 per diluted common share, for the same period in 2017. ROE was 13.05% and ROA was 1.19% for the six months ended June 30, 2018 compared to 9.35% and 0.90%, respectively, for the same period in 2017. The increase in ROE and ROA for the first half of 2018 resulted primarily from an increase in net interest income and a decrease in income tax expense caused by a decline in income tax rates as a result of the Tax Act, offset by increases in the provision for credit losses and non-interest expense.

Net income increased $20.3 million, or 40%, for the three months ended June 30, 2018, as compared to the same period in 2017. The increase was primarily the result of a $48.8 million increase in net interest income and a $7.4 million decrease in income tax expense, offset by a $14.0 million increase in the provision for credit losses, and a $20.3 million increase in non-interest expense. Net income increased $49.7 million, or 53% for the six months ended June 30, 2018, as compared to the same period in 2017. The increase was primarily the result of a $95.7 million increase in net interest income and a $10.9 million decrease in income tax expense, offset by a $17.0 million increase in the provision for credit losses and a $41.2 million increase in non-interest expense.

Details of the changes in the various components of net income are discussed below.

Net Interest Income

Net interest income was $231.7 million for the second quarter of 2018, compared to $183.0 million for the second quarter of 2017. The increase was due to an increase in average earning assets of $3.1 billion as compared to the second quarter of 2017, as well as the effect of increases in interest rates on loan yields. The increase in average earning assets included a $670.4 million increase in average loans held for sale and a $3.2 billion increase in average net loans held for investment, offset by a $40.5 million decrease in average investment securities and a $759.5 million decrease in average liquidity assets. For the quarter ended June 30, 2018, average net loans held for investment, liquidity assets and loans held for sale represented approximately 87%, 7% and 6%, respectively, of average earning assets compared to approximately 85%, 11% and 4% for the same quarter of 2017.

Average interest-bearing liabilities for the quarter ended June 30, 2018 increased $2.9 billion from the second quarter of 2017, which included a $2.2 billion increase in average interest-bearing deposits and a $656.7 million increase in other borrowings. Average demand deposits were $8.0 billion for the quarter ended June 30, 2018, compared to $7.9 billion for the same period of 2017. The average cost of total deposits and borrowed funds increased to 0.92% for the second quarter of 2018 compared to 0.43% for the same period of 2017. The cost of interest-bearing liabilities increased from 0.90% for the quarter ended June 30, 2017 to 1.56% for the same period of 2018.

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Net interest income was $442.0 million for the six months ended June 30, 2018, compared to $346.3 million for the same period of 2017. The increase was due to an increase in average earning assets of $3.0 billion as compared to the six months ended June 30, 2017, as well as the effect of increases in interest rates on loan yields. The increase in average earning assets included a $398.4 million increase in average loans held for sale and a $3.5 billion increase in average net loans held for investment, offset by a $24.5 million decrease in average securities and a $891.3 million decrease in average liquidity assets. For the six months ended June 30, 2018, average net loans held for investment, liquidity assets and loans held for sale represented approximately 85%, 9% and 6%, respectively, of average earning assets compared to approximately 80%, 15% and 5% for the same period of 2017.

Average interest-bearing liabilities for the six months ended June 30, 2018 increased $2.6 billion from the same period of 2017, which included a $2.0 billion increase in average interest-bearing deposits and a $523.2 million increase in other borrowings. Average demand deposits increased from $7.7 billion for the six months ended June 30, 2017 to $8.1 billion for the six months ended June 30, 2018. The average cost of total deposits and borrowed funds increased to 0.83% for the six months ended June 30, 2018 compared to 0.39% for the same period of 2017. The cost of interest-bearing liabilities increased from 0.82% for the six months ended June 30, 2017 to 1.44% for the same period of 2018.

The following table (in thousands) presents changes in taxable-equivalent net interest income between the three and six month periods ended June 30, 2018 and 2017 and identifies the changes due to differences in the average volume of earning assets and interest-bearing liabilities and changes due to differences in the average interest rate on those assets and liabilities.

	Three months ended June 30, 2018/2017								Six months ended June 30, 2018/2017
	Net			Change Due To(1)					Net			Change Due To(1)
	Change			Volume			Yield/Rate(2)		Change			Volume			Yield/Rate(2)
Interest income:
Investment securities	$	(94	)	$	(179	)	$	85	$	(115	)	$	(237	)	$	122
Loans held for sale	8,791			6,535			2,256		11,791			7,638			4,153
Loans held for investment, mortgage finance loans	13,657			9,588			4,069		27,914			20,826			7,088
Loans held for investment	55,386			25,472			29,914		105,701			52,780			52,921
Federal funds sold and securities purchased under resale agreements	311			(19		)	330		826			(48		)	874
Interest-bearing deposits in other banks	643			(1,949		)	2,592		2,830			(3,940		)	6,770
Total	78,694			39,448			39,246		148,947			77,019			71,928
Interest expense:
Transaction deposits	7,402			1,274			6,128		13,860			2,125			11,735
Savings deposits	12,514			1,557			10,957		23,989			3,050			20,939
Time deposits	3,158			810			2,348		3,634			924			2,710
Other borrowings	6,522			1,637			4,885		10,898			2,298			8,600
Long-term debt	312			5			307		509			10			499
Total	29,908			5,283			24,625		52,890			8,407			44,483
Net interest income	$	48,786		$	34,165		$	14,621	$	96,057		$	68,612		$	27,445

(1) Yield/rate and volume variances are allocated to yield/rate.

(2) Taxable equivalent rates are used where applicable.

Net interest margin, which is defined as the ratio of net interest income to average earning assets, was 3.93% for the second quarter of 2018 compared to 3.57% for the second quarter of 2017. The year-over-year increase was due primarily to the increase in total loans held for investment, improved asset composition and the effect of increases in interest rates on loan yields attributable to our asset-sensitive balance sheet. The yield on total loans held for investment increased to 5.14% for the second quarter of 2018 compared to 4.50% for the second quarter of 2017 and the yield on earning assets increased to 4.86% for the second quarter of 2018 compared to 4.06% for the second quarter of 2017. Funding costs, including demand deposits and borrowed funds, increased to 0.92% for the second quarter of 2018 compared to 0.43% for the second quarter of 2017. The spread on total earning assets, net of the cost of deposits and borrowed funds, was 3.94% for the second quarter of 2018

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compared to 3.63% for the second quarter of 2017. The increase resulted primarily from increases in interest rates and increases in the higher yielding loan components of earning assets. Total funding costs, including all deposits, long-term debt and stockholders’ equity, increased to 0.90% for the second quarter of 2018 compared to 0.48% for the second quarter of 2017.

Non-interest Income

The components of non-interest income were as follows (in thousands):

	Three months ended June 30,					Six months ended June 30,
	2018			2017		2018		2017
Service charges on deposit accounts	$	3,005		$	3,067	$	6,142	$	6,112
Wealth management and trust fee income	2,007			1,402		3,931		2,759
Bank owned life insurance (BOLI) income	657			481		1,316		947
Brokered loan fees	5,815			5,809		10,983		11,487
Servicing income	4,967			3,700		10,459		5,901
Swap fees	1,352			954		2,914		2,757
Other	(524		)	3,356		1,481		5,916
Total non-interest income	$	17,279		$	18,769	$	37,226	$	35,879

Non-interest income decreased$1.5 million during the three months ended June 30, 2018 compared to the same period of 2017. This decrease was primarily due to a $3.9 million decrease in other non-interest income attributable to a decrease in gain on sale of MCA loans, offset by a $1.3 million increase in servicing income attributable to an increase in MSRs.

Non-interest income increased $1.3 million during the six months ended June 30, 2018 compared to the same period of 2017. This increase was primarily due to a $4.6 million increase in servicing income attributable to an increase in MSRs as well as a $1.2 million increase in wealth management and trust fee income due to an increase in assets under management. These increases were offset by a $4.4 million decrease in other non-interest income compared to the same period of 2017 primarily attributable to a decrease in gain on sale of MCA loans.

While management expects continued growth in certain components of non-interest income, the future rate of growth could be affected by increased competition from nationwide and regional financial institutions among other factors. In order to achieve growth in non-interest income, management from time to time evaluates new products, new lines of business and the expansion of existing lines of business. Any new product introduction or new market entry could place additional demands on capital and managerial resources.

Non-interest Expense

The components of non-interest expense were as follows (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Salaries and employee benefits	$	72,404	$	63,154	$	144,941	$	126,157
Net occupancy expense	7,356		6,515		14,590		12,626
Marketing	10,236		6,157		18,913		11,107
Legal and professional	11,654		7,127		19,184		14,580
Communications and technology	7,143		11,906		13,776		18,412
FDIC insurance assessment	6,257		4,603		12,360		10,597
Servicing related expenses	4,367		2,682		8,172		4,432
Allowance and other carrying costs for OREO	176		71		2,331		210
Other(1)	12,538		9,599		24,824		19,787
Total non-interest expense	$	132,131	$	111,814	$	259,091	$	217,908

(1) Other expense includes such items as courier expenses, regulatory assessments other than FDIC insurance, due from bank charges and other general operating expenses, none of which account for 1% or more of total interest income and non-interest income.

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Non-interest expense for the second quarter of 2018 increased $20.3 million, or 18%, to $132.1 million from $111.8 million in the second quarter of 2017. The increase is primarily due to increases in salaries and employee benefits, marketing, legal and professional, FDIC insurance assessment and other non-interest expenses, all of which were attributable to general business growth. Servicing related expenses for the second quarter of 2018 increased $1.7 million compared to the second quarter of 2017 primarily due to an increase in MSRs, which are being amortized. Offsetting these increases was a $4.8 million decrease in communications and technology expense primarily related to a technology write-off taken in the second quarter of 2017.

Non-interest expense for the six months ended June 30, 2018 increased $41.2 million, or 19%, to $259.1 million from $217.9 million for the six months ended June 30, 2017. The increase is primarily due to increases in salaries and employee benefits, net occupancy expense, marketing, legal and professional, FDIC insurance assessment and other non-interest expenses, all of which were attributable to general business growth. Servicing related expenses for the six months ended June 30, 2018 increased $3.7 million compared to the six months ended June 30, 2017 primarily due to an increase in MSRs, which are being amortized. We also recorded a $2.0 million OREO valuation allowance during the six months ended June 30, 2018. Offsetting these increases was a $4.6 million decrease in communications and technology expense primarily related to a technology write-off taken in the second quarter of 2017.

Analysis of Financial Condition

Loans Held for Investment

Loans were as follows as of the dates indicated (in thousands):

	June 30, 2018			December 31, 2017
Commercial	$	10,189,832		$	9,189,811
Mortgage finance	5,923,058			5,308,160
Construction	2,226,590			2,166,208
Real estate	3,868,411			3,794,577
Consumer	46,652			48,684
Leases	314,575			264,903
Gross loans held for investment	22,569,118			20,772,343
Deferred income (net of direct origination costs)	(109,339		)	(97,931		)
Allowance for loan losses	(179,096		)	(184,655		)
Total loans held for investment, net	$	22,280,683		$	20,489,757

Our business plan focuses primarily on lending to middle market businesses and successful professionals and entrepreneurs, and as such, commercial, real estate and construction loans have comprised a majority of our loan portfolio. Consumer loans generally have represented 1% or less of the portfolio. Mortgage finance loans relate to our mortgage warehouse lending operations in which we purchase mortgage loan ownership interests that are typically sold within 10 to 20 days. Volumes fluctuate based on the level of market demand for the product and the number of days between purchase and sale of the loans, as well as overall market interest rates and tend to peak at the end of each month.

We originate a substantial majority of all loans held for investment, excluding mortgage finance loans. We also participate in syndicated loan relationships, both as a participant and as an agent. As of June 30, 2018, we had $3.0 billion in syndicated loans, $1.1 billion of which we administer as agent. All syndicated loans, whether we act as agent or participant, are underwritten to the same standards as all other loans we originate. As of June 30, 2018, $36.0 million of our syndicated loans were on non-accrual.

Portfolio Geographic Concentration

More than 50% of our loan exposure is outside of Texas and more than 50% of our deposits are sourced outside of Texas. However, as of June 30, 2018, a majority of our loans held for investment, excluding our mortgage finance loans and other national lines of business, were to businesses with headquarters and operations in Texas. This geographic concentration subjects the loan portfolio to the general economic conditions within this area. We also make loans to these customers that are secured by assets located outside of Texas. The risks created by this concentration have been considered by management in the determination of the appropriateness of the allowance for loan losses.

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Summary of Loan Loss Experience

The provision for credit losses, which includes a provision for losses on unfunded commitments, is a charge to earnings to maintain the allowance for loan losses at a level consistent with management’s assessment of the collectability of the loan portfolio in light of current economic conditions and market trends. We recorded a provision for credit losses of $27.0 million during the second quarter of 2018 compared to $13.0 million in the second quarter of 2017 and $12.0 million in the first quarter of 2018. The increase in provision recorded during the second quarter of 2018 compared to the same period in 2017 was primarily related to loan growth, as well as credit deterioration in four loans, all of which were identified as non-accrual loans as of March 31, 2018.

The allowance for credit losses, including the allowance for losses on unfunded commitments reported on the consolidated balance sheet in other liabilities, totaled $189.6 million at June 30, 2018, $193.7 million at December 31, 2017 and $183.4 million at June 30, 2017. The combined allowance as a percentage of loans held for investment excluding mortgage finance loans decreased to 1.15% at June 30, 2018 from 1.26% at December 31, 2017 and 1.28% at June 30, 2017 as a result of strong loan growth and overall positive trends in the credit quality of our portfolio.

The allowance for credit losses results from consistent application of our loan loss reserve methodology. At June 30, 2018, we believe the allowance is appropriate and has been derived from consistent application of our methodology. Should any of the factors considered by management in evaluating the appropriateness of the allowance for loan losses change, our estimate of inherent losses in the portfolio could also change, which would affect the level of future provisions for loan losses.

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Activity in the allowance for loan losses is presented in the following table (in thousands, except percentage and multiple data):

	Six months ended   June 30, 2018			Year ended December 31, 2017			Six months ended   June 30, 2017
Allowance for loan losses:
Beginning balance	$	184,655		$	168,126		$	168,126
Loans charged-off:
Commercial	43,972			34,145			21,543
Construction	—			59			—
Real estate	—			290			40
Consumer	—			180			180
Leases	—			—			—
Total charge-offs	43,972			34,674			21,763
Recoveries:
Commercial	680			4,593			3,442
Construction	—			104			101
Real estate	32			75			53
Consumer	68			70			41
Leases	20			10			8
Total recoveries	800			4,852			3,645
Net charge-offs	43,172			29,822			18,118
Provision for loan losses	37,613			46,351			24,217
Ending balance	$	179,096		$	184,655		$	174,225
Allowance for off-balance sheet credit losses:
Beginning balance	$	9,071		$	11,422		$	11,422
Provision for off-balance sheet credit losses	1,387			(2,351		)	(2,217		)
Ending balance	$	10,458		$	9,071		$	9,205
Total allowance for credit losses	$	189,554		$	193,726		$	183,430
Total provision for credit losses	$	39,000		$	44,000		$	22,000
Allowance for loan losses to LHI	0.80		%	0.89		%	0.90		%
Allowance for loan losses to LHI excluding mortgage finance loans	1.08		%	1.20		%	1.22		%
Net charge-offs to average LHI(1)	0.43		%	0.16		%	0.22		%
Net charge-offs to average LHI excluding mortgage finance loans(1)	0.56		%	0.21		%	0.27		%
Total provision for credit losses to average LHI(1)	0.39		%	0.24		%	0.27		%
Total provision for credit losses to average LHI excluding mortgage finance loans(1)	0.50		%	0.31		%	0.33		%
Recoveries to total charge-offs	1.82		%	13.99		%	16.83		%
Allowance for off-balance sheet credit losses to off-balance sheet credit commitments	0.14		%	0.13		%	0.14		%
Total allowance for credit losses to LHI	0.84		%	0.94		%	0.94		%
Total allowance for credit losses to LHI excluding mortgage finance loans	1.15		%	1.26		%	1.28		%
Allowance for loan losses to non-accrual loans	2.2x			1.8x			1.4x

(1) Interim period ratios are annualized.

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Non-performing Assets

Non-performing assets include non-accrual loans and leases and repossessed assets. The table below summarizes our non-accrual loans by type and by type of property securing the credit and OREO (in thousands):

	June 30, 2018		December 31, 2017		June 30, 2017
Non-accrual loans:(1)
Commercial
Oil and gas properties	$	33,612	$	64,192	$	78,824
Assets of the borrowers	18,973		7,571		15,305
Inventory	24,829		24,399		23,297
Other	2,172		3,569		2,142
Total commercial	79,586		99,731		119,568
Real estate
Commercial property	1,042		1,096		2,591
Unimproved land and/or developed residential lots	—		—		—
Single family residences	1,263		—		1,294
Other	238		617		277
Total real estate	2,543		1,713		4,162
Consumer	66		—		—
Leases	1,100		—		—
Total non-accrual loans	83,295		101,444		123,730
Repossessed assets:
OREO(2)	9,526		11,742		18,689
Other repossessed assets	—		—		—
Total non-performing assets	$	92,821	$	113,186	$	142,419
Loans held for investment past due 90 days and accruing(3)	$	7,357	$	8,429	$	11,077
Loans held for sale past due 90 days and accruing(4)	$	27,858	$	19,737	$	—

(1) As of June 30, 2018, December 31, 2017 and June 30, 2017, non-accrual loans included $9.0 million, $18.8 million and $16.7 million, respectively, in loans that met the criteria for restructured.

(2) At June 30, 2018, there was a $2.0 million valuation allowance recorded against the OREO balance, compared to none at December 31, 2017 and June 30, 2017.

(3) At June 30, 2018, December 31, 2017 and June 30, 2017, loans past due 90 days and still accruing include premium finance loans of $6.0 million, $5.5 million and $6.3 million, respectively.

(4) Includes loans guaranteed by U.S. government agencies that were repurchased out of Ginnie Mae securities. Loans are recorded as loans held for sale and carried at fair value on the balance sheet. Interest on these past due loans accrues at the debenture rate guaranteed by the U.S. government. Also includes loans that, pursuant to Ginnie Mae servicing guidelines, we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met and therefore must record as loans held for sale on our balance sheet regardless of whether the repurchase option has been exercised.

Total non-performing loans at June 30, 2018 decreased $40.4 million from June 30, 2017 and decreased $18.1 million from December 31, 2017, primarily related to the charge-off of four loans in the second quarter of 2018. One of the loans is energy-related, two are leveraged health care and one is general commercial and industrial.

Potential problem loans consist of loans that are performing in accordance with contractual terms but for which we have concerns about the borrower’s ability to comply with repayment terms because of the borrower’s potential financial difficulties. We monitor these loans closely and review their performance on a regular basis. At June 30, 2018, we had $27.4 million in loans of this type, compared to $49.1 million at December 31, 2017, which were not included in either non-accrual or 90 days past due categories.

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Loans Held for Sale

Through our MCA program, we commit to purchase residential mortgage loans from independent correspondent lenders and deliver those loans into the secondary market via whole loan sales to independent third parties or in securitization transactions to Ginnie Mae and GSEs such as Fannie Mae and Freddie Mac. For additional information on our loans held for sale portfolio, see Note 6 - Certain Transfers of Financial Assets in the accompanying notes to the consolidated financial statements included elsewhere in this report.

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Liquidity and Capital Resources

In general terms, liquidity is a measurement of our ability to meet our cash needs. Our objective in managing our liquidity is to maintain our ability to meet loan commitments, purchase investment securities or repay deposits and other liabilities in accordance with their terms, without an adverse impact on our current or future earnings. Our liquidity strategy is guided by policies, formulated and monitored by our senior management and our Balance Sheet Management Committee (“BSMC”), which take into account the demonstrated marketability of assets, the sources and stability of our funding and the level of unfunded commitments. We regularly evaluate all of our various funding sources with an emphasis on accessibility, stability, reliability and cost effectiveness. For the year ended December 31, 2017 and for the six months ended June 30, 2018 our principal source of funding has been our customer deposits, supplemented by our short-term and long-term borrowings, primarily from Federal funds purchased and Federal Home Loan Bank ("FHLB") borrowings, which are generally used to fund mortgage finance assets.

Liquidity assets were $3.3 billion at June 30, 2018, and continue to be significant as a result of deposit growth and increases in borrowing capacity related to our mortgage finance loans. The following table summarizes the composition of liquidity assets (in thousands):

	June 30, 2018			December 31, 2017			June 30, 2017
Federal funds sold and securities purchased under resale agreements	$	39,000		$	30,000		$	25,000
Interest-bearing deposits in other banks	3,249,107			2,697,581			2,117,658
Total liquidity assets	$	3,288,107		$	2,727,581		$	2,142,658
Total liquidity assets as a percent of:
Total loans held for investment, excluding mortgage finance loans	19.9		%	17.8		%	15.0		%
Total loans held for investment	14.6		%	13.2		%	11.0		%
Total earning assets	12.2		%	11.2		%	9.6		%
Total deposits	16.2		%	14.3		%	12.4		%

Our liquidity needs to support growth in loans held for investment have been fulfilled primarily through growth in our core customer deposits. Our goal is to obtain as much of our funding for loans held for investment and other earning assets as possible from deposits of these core customers. These deposits are generated principally through development of long-term relationships with customers, with a significant focus on treasury management products. In addition to deposits from our core customers, we also have access to deposits through brokered customer relationships. For regulatory purposes, these relationship brokered deposits are categorized as brokered deposits; however, since these deposits arise from a customer relationship, which involves extensive treasury services, we consider these deposits to be core deposits for our reporting purposes.

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We also have access to incremental deposits through brokered retail certificates of deposit, or CDs. These traditional brokered deposits are generally of short maturities, 30 to 90 days, and are used to fund temporary differences in the growth in loan balances, including growth in loans held for sale or other specific categories of loans as compared to customer deposits. The following table summarizes our period-end and average year-to-date core customer deposits, relationship brokered deposits and traditional brokered deposits (in millions):

	June 30, 2018			December 31, 2017			June 30, 2017
Deposits from core customers	$	17,404.4		$	17,100.8		$	15,766.1
Deposits from core customers as a percent of total deposits	85.6		%	89.4		%	91.2		%
Relationship brokered deposits	$	1,902.3		$	2,022.4		$	1,526.1
Relationship brokered deposits as a percent of total deposits	9.3		%	10.6		%	8.8		%
Traditional brokered deposits	$	1,028.2		$	—		$	—
Traditional brokered deposits as a percent of total deposits	5.1		%	—		%	—		%
Average deposits from core customers(1)	$	17,406.2		$	16,806.9		$	15,700.8
Average deposits from core customers as a percent of total quarterly average deposits(1)	89.0		%	91.1		%	91.7		%
Average relationship brokered deposits(1)	$	1,891.6		$	1,647.0		$	1,426.8
Average relationship brokered deposits as a percent of total quarterly average deposits(1)	9.7		%	8.9		%	8.3		%
Average traditional brokered deposits(1)	$	253.6		$	—		$	—
Average traditional brokered deposits as a percent of total quarterly average deposits(1)	1.3		%	—		%	—		%

(1) Annual averages presented for December 31, 2017.

We have access to sources of traditional brokered deposits that we estimate to be $3.0 billion. Based on our internal guidelines, we have chosen to limit our use of these sources to a lesser amount. Customer deposits (total deposits, including relationship brokered deposits, minus brokered CDs) at June 30, 2018 increased by $183.5 million from December 31, 2017 and increased $2.0 billion from June 30, 2017.

We have short-term borrowing sources available to supplement deposits and meet our funding needs. Such borrowings are generally used to fund our mortgage finance assets, due to their liquidity, short duration and interest spreads available. These borrowing sources include Federal funds purchased from our downstream correspondent bank relationships (which consist of banks that are smaller than our bank) and from our upstream correspondent bank relationships (which consist of banks that are larger than our bank), customer repurchase agreements, and advances from the FHLB and the Federal Reserve. The following table summarizes our short-term borrowings as of June 30, 2018 (in thousands):

Federal funds purchased	$	510,221
Repurchase agreements	10,628
FHLB borrowings	4,000,000
Line of credit	—
Total short-term borrowings	$	4,520,849
Maximum short-term borrowings outstanding at any month-end during 2018	$	4,520,849

The following table summarizes our other borrowing capacities in excess of balances outstanding at June 30, 2018 (in thousands):

FHLB borrowing capacity relating to loans	$	4,433,623
FHLB borrowing capacity relating to investment securities	938
Total FHLB borrowing capacity	$	4,434,561
Unused Federal funds lines available from commercial banks	$	700

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The following table summarizes our long-term borrowings as of June 30, 2018 (in thousands):

Subordinated notes	$	281,586
Trust preferred subordinated debentures	113,406
Total long-term borrowings	$	394,992

Our unsecured, revolving, non-amortizing line of credit has maximum availability of $130.0 million, matured on December 19, 2017, and was renewed on December 19, 2017 with a maturity date of December 18, 2018. The loan proceeds may be used for general corporate purposes including funding regulatory capital infusions into the Bank. The loan agreement contains customary financial covenants and restrictions. As of June 30, 2018 and December 31, 2017, there were no borrowings outstanding.

Our equity capital, including $150 million in preferred stock, averaged $2.3 billion for the six months ended June 30, 2018, as compared to $2.1 billion for the same period in 2017. We have not paid any cash dividends on our common stock since we commenced operations and have no plans to do so in the foreseeable future.

As of June 30, 2018, our capital ratios were above the levels required to be well capitalized. We believe that our earnings, periodic capital raising transactions and the addition of loan and deposit relationships will allow us to continue to grow organically.

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Commitments and Contractual Obligations

The following table presents significant fixed and determinable contractual payment obligations to third parties by payment date. Payments for borrowings do not include interest. Payments related to leases are based on actual payments specified in the underlying contracts. As of June 30, 2018, our significant fixed and determinable contractual obligations to third parties, excluding interest, were as follows (in thousands):

	Within One Year		After One but Within Three Years		After Three but Within Five Years		After Five Years		Total
Deposits without a stated maturity	$	18,853,162	$	—	$	—	$	—	$	18,853,162
Time deposits	1,458,047		22,841		321		500		1,481,709
Federal funds purchased and customer repurchase agreements	520,849		—		—		—		520,849
FHLB borrowings	4,000,000		—		—		—		4,000,000
Operating lease obligations(1)	16,813		30,908		25,117		12,691		85,529
Subordinated notes	—		—		—		281,586		281,586
Trust preferred subordinated debentures	—		—		—		113,406		113,406
Total contractual obligations	$	24,848,871	$	53,749	$	25,438	$	408,183	$	25,336,241

(1) Non-balance sheet item.

Critical Accounting Policies

SEC guidance requires disclosure of “critical accounting policies.” The SEC defines “critical accounting policies” as those that are most important to the presentation of a company’s financial condition and results, and require management’s most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

We follow financial accounting and reporting policies that are in accordance with accounting principles generally accepted in the United States. The more significant of these policies are summarized in Note 1 - Operations and Summary of Significant Accounting Policies in the accompanying notes to the consolidated financial statements included in the 2017 Form 10-K. Not all significant accounting policies require management to make difficult, subjective or complex judgments. However, the policy noted below could be deemed to meet the SEC’s definition of a critical accounting policy.

Allowance for Loan Losses

Management considers the policies related to the allowance for loan losses as the most critical to the financial statement presentation. The total allowance for loan losses includes activity related to allowances calculated in accordance with Accounting Standards Codification (“ASC”) 310, Receivables, and ASC 450, Contingencies. The allowance for loan losses is established through a provision for credit losses charged to current earnings. The amount maintained in the allowance reflects management’s continuing evaluation of the loan losses inherent in the loan portfolio. The allowance for loan losses is comprised of specific reserves assigned to certain classified loans and general reserves. Factors contributing to the determination of specific reserves include the creditworthiness of the borrower, and more specifically, changes in the expected future receipt of principal and interest payments and/or in the value of pledged collateral. A reserve is recorded when the carrying amount of the loan exceeds the discounted estimated cash flows using the loan’s initial effective interest rate or the fair value of the collateral for certain collateral-dependent loans. For purposes of determining the general allowance, the portfolio is segregated by product types in order to recognize differing risk profiles among categories, and then further segregated by credit grades. See “Summary of Loan Loss Experience” above and Note 4 – Loans Held for Investment and Allowance for Loan Losses in the accompanying notes to the consolidated financial statements included elsewhere in this report for further discussion of the risk factors considered by management in establishing the allowance for loan losses.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is a broad term for the risk of economic loss due to adverse changes in the fair value of a financial instrument. These changes may be the result of various factors, including interest rates, foreign exchange rates, commodity prices, or equity prices. Additionally, the financial instruments subject to market risk can be classified either as held for trading purposes or held for other than trading.

We are subject to market risk primarily through the effect of changes in interest rates on our portfolio of assets held for purposes other than trading. Additionally, we have some market risk relative to commodity prices through our energy lending activities. Petroleum and natural gas commodity prices were suppressed throughout 2015 and 2016, but stabilized amidst continuing market uncertainty during 2017 and continuing into 2018. Declines in commodity prices negatively impacted our energy clients' ability to perform on their loan obligations, and further uncertainty and volatility could have a negative impact on our customers and our loan portfolio. Management does not currently expect the current decline in commodity prices to have a material adverse effect on our financial position. Foreign exchange rates, commodity prices and/or equity prices do not pose significant market risk to us.

The responsibility for managing market risk rests with the BSMC, which operates under policy guidelines established by our board of directors. The negative acceptable variation in net interest revenue due to a 200 basis point increase or decrease in interest rates is generally limited by these guidelines to plus or minus 10-15%. These guidelines also establish maximum levels for short-term borrowings, short-term assets and public and brokered deposits. They also establish minimum levels for liquidity, among other things. Oversight of our compliance with these guidelines is the ongoing responsibility of the BSMC, with exceptions reported to the Risk Management Committee, and to our board of directors if deemed necessary, on a quarterly basis. Additionally, the Credit Policy Committee ("CPC") specifically manages risk relative to commodity price market risks. The CPC establishes maximum portfolio concentration levels for energy loans as well as maximum advance rates for energy collateral.

Interest Rate Risk Management

Our interest rate sensitivity is illustrated in the following table. The table reflects rate-sensitive positions as of June 30, 2018, and is not necessarily indicative of positions on other dates. The balances of interest rate sensitive assets and liabilities are presented in the periods in which they next reprice to market rates or mature and are aggregated to show the interest rate sensitivity gap. The mismatch between repricings or maturities within a time period is commonly referred to as the “gap” for that period. A positive gap (asset sensitive), where interest-rate sensitive assets exceed interest rate sensitive liabilities, generally will result in the net interest margin increasing in a rising rate environment and decreasing in a falling rate environment. A negative gap (liability sensitive) will generally have the opposite results on the net interest margin. To reflect anticipated prepayments, certain asset and liability categories are shown in the table using estimated cash flows rather than contractual cash flows. The Company employs interest rate floors in certain variable rate loans to enhance the yield on those loans at times when market interest rates are extraordinarily low. The degree of asset sensitivity, spreads on loans and net interest margin may be reduced until rates increase by an amount sufficient to eliminate the effects of floors. The adverse effect of floors as market rates increase may also be offset by the positive gap, the extent to which rates on deposits and other funding sources lag increasing market rates and changes in composition of funding.

48

Interest Rate Sensitivity Gap Analysis

June 30, 2018

(In thousands)

	0-3 mo Balance		4-12 mo Balance		1-3 yr Balance		3+ yr Balance		Total Balance
Assets:
Interest-bearing deposits in other banks, federal funds sold and securities purchased under resale agreements	$	3,288,107	$	—	—		$	—	$	3,288,107
Investment securities(1)	7,982		13,626		2,744		56		24,408
Total variable loans	19,763,373		69,949		343		1,596		19,835,261
Total fixed loans	588,636		1,681,084		420,788		1,320,117		4,010,625
Total loans(2)	20,352,009		1,751,033		421,131		1,321,713		23,845,886
Total interest sensitive assets	$	23,648,098	$	1,764,659	$	423,875	$	1,321,769	$	27,158,401
Liabilities:
Interest-bearing customer deposits	$	10,176,841	$	—	$	—	$	—	$	10,176,841
CDs & IRAs	204,488		1,253,559		22,841		821		1,481,709
Traditional brokered deposits	1,028,196		—		—		—		1,028,196
Total interest-bearing deposits	11,409,525		1,253,559		22,841		821		12,686,746
Repurchase agreements, Federal funds      purchased, FHLB borrowings, line      of credit	4,520,849		—		—		—		4,520,849
Subordinated notes	—		—		—		281,586		281,586
Trust preferred subordinated debentures	—		—		—		113,406		113,406
Total borrowings	4,520,849		—		—		394,992		4,915,841
Total interest sensitive liabilities	$	15,930,374	$	1,253,559	$	22,841	$	395,813	$	17,602,587
Gap	$	7,717,724	$	511,100	$	401,034	$	925,956	$	—
Cumulative Gap	7,717,724		8,228,824		8,629,858		9,555,814		9,555,814
Demand deposits									$	7,648,125
Stockholders’ equity									2,343,530
Total									$	9,991,655

(1) Investment securities based on fair market value.

(2) Loans are stated at gross.

The table above sets forth the balances as of June 30, 2018 for interest-bearing assets, interest-bearing liabilities and the total of non-interest-bearing deposits and stockholders’ equity. While a gap interest table is useful in analyzing interest rate sensitivity, an interest rate sensitivity simulation provides a better illustration of the sensitivity of earnings to changes in interest rates. Earnings are also affected by changing interest rates on the value of funding derived from demand deposits and stockholders’ equity. We perform a sensitivity analysis to identify interest rate risk exposure on net interest income. We quantify and measure interest rate risk exposure using a model to dynamically simulate the effect of changes in net interest income relative to changes in interest rates and loan and deposit account balances over the next twelve months based on three interest rate scenarios. These are a “most likely” rate scenario and two “shock test” scenarios.

The “most likely” rate scenario is based on the consensus forecast of future interest rates published by independent sources. These forecasts incorporate future spot rates and relevant spreads of instruments that are actively traded in the open market. The Federal Reserve’s Federal funds target affects short-term borrowing rates; the prime lending rate and LIBOR are the basis for most of our variable-rate loan pricing. The 10-year mortgage rate is also monitored because of its effect on prepayment speeds for mortgage-backed securities. We believe these are our primary interest rate exposures. We are not currently using derivatives to manage our interest rate exposure.

49

For modeling purposes, as of June 30, 2018, the “shock test” scenarios assume a sustained parallel 100 and 200 basis point increase in interest rates, as well as a 100 basis point decrease in rates. As of June 30, 2017, the scenarios assumed a sustained parallel 100 and 200 basis point increase in interest rates. As short-term rates remained low through 2017, we did not believe that analysis of an assumed decrease in interest rates would provide meaningful results.

Our interest rate risk exposure model incorporates assumptions regarding the level of interest rate or balance changes on indeterminable maturity deposits (demand deposits, interest-bearing transaction accounts and savings accounts) for a given level of market rate changes. Given the current environment of increasing short-term rates, deposit pricing can vary by product and customer. These assumptions have been developed through a combination of historical analysis and future expected pricing behavior. Changes in prepayment behavior of mortgage-backed securities, residential and commercial mortgage loans in each rate environment are captured using industry estimates of prepayment speeds for various coupon segments of the portfolio. The impact of planned growth and new business activities is factored into the simulation model. This modeling indicated interest rate sensitivity as follows (in thousands):

	Anticipated Impact Over the Next Twelve Months as Compared to Most Likely Scenario							Anticipated Impact Over the Next Twelve Months as Compared to Most Likely Scenario
	100 bp Increase		200 bp Increase		100 bp Decrease			100 bp Increase		200 bp Increase
	June 30, 2018							June 30, 2017
Change in net interest income	$	111,535	$	223,577	$	(121,095	)	$	119,929	$	241,922

The simulations used to manage market risk are based on numerous assumptions regarding the effect of changes in interest rates on the timing and extent of repricing characteristics, future cash flows and customer behavior. These assumptions are inherently uncertain and, as a result, the model cannot precisely estimate net interest income or precisely predict the impact of higher or lower interest rates on net interest income. Actual results may differ from simulated results due to timing, magnitude and frequency of interest rate changes as well as changes in market conditions and management strategies, among other factors.

50

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the supervision and participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as of the end of the period covered by this report. Based upon that evaluation, we have concluded that, as of the end of such period, our disclosure controls and procedures were effective in recording, processing, summarizing and reporting, on a timely basis, information required to be disclosed by us in the reports that we file or submit under the Exchange Act and were effective in ensuring that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to the Company’s management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are subject to various claims and legal actions related to operating activities that arise in the ordinary course of business. Management does not currently expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.

ITEM 1A. RISK FACTORS

There have been no material changes in the risk factors previously disclosed in the 2017 Form 10-K.

51

ITEM 6. EXHIBITS

(a)	Exhibits
	31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
	31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
	32.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
	32.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
	101	The following materials from Texas Capital Bancshares, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Income, (ii) Consolidated Balance Sheets, (iii) Consolidated Statements of Cash Flows, and (iv) Notes to Consolidated Financial Statements

52

SIGNATURES

Pursuant to the requirements 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.

TEXAS CAPITAL BANCSHARES, INC.

Date: July 19, 2018

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

(Duly authorized officer and principal financial officer)

53

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, C. Keith Cargill, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Texas Capital Bancshares, Inc.;

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 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 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.

Date: July 19, 2018

/s/ C. Keith Cargill

C. Keith Cargill

Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Julie Anderson, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Texas Capital Bancshares, Inc.;

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 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 controls 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 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.

Date: July 19, 2018

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION

In connection with the Quarterly Report on Form 10-Q of Texas Capital Bancshares, Inc. (the “Company”) for the period ending June 30, 2018 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, C. Keith Cargill, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my 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 Company.

/s/ C. Keith Cargill

C. Keith Cargill

Chief Executive Officer

Date: July 19, 2018

EX-32.2

EXHIBIT 32.2

CERTIFICATION

In connection with the Quarterly Report on Form 10-Q of Texas Capital Bancshares, Inc. (the “Company”) for the period ending June 30, 2018 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, Julie Anderson, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my 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 Company.

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

Date: July 19, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 18, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,158,736

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 174,687	$ 178,010
Interest-bearing deposits in other banks	3,249,107	2,697,581
Federal funds sold and securities purchased under resale agreements	39,000	30,000
Investment securities	24,408	23,511
Loans held for sale ($1,275.5 million and $1,007.7 million at June 30, 2018 and December 31, 2017, respectively, at fair value)	1,276,768	1,011,004
Loans held for investment, mortgage finance	5,923,058	5,308,160
Loans held for investment (net of unearned income)	16,536,721	15,366,252
Less: Allowance for loan losses	179,096	184,655
Loans held for investment, net	22,280,683	20,489,757
Mortgage servicing rights, net	82,776	85,327
Premises and equipment, net	26,175	25,176
Accrued interest receivable and other assets	609,501	516,239
Goodwill and intangible assets, net	18,805	19,040
Total assets	27,781,910	25,075,645
Non-interest-bearing
Non-interest-bearing	7,648,125	7,812,660
Interest-bearing	12,686,746	11,310,520
Total deposits	20,334,871	19,123,180
Accrued interest payable	11,268	7,680
Other liabilities	176,400	182,212
Federal funds purchased and repurchase agreements	520,849	365,040
Other borrowings	4,000,000	2,800,000
Subordinated notes, net	281,586	281,406
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	25,438,380	22,872,924
Stockholders’ equity:
Preferred stock, $.01 par value, $1,000 liquidation value; Authorized shares - 10,000,000; Issued shares – 6,000,000 shares issued at June 30, 2017 and December 31, 2016, respectively	150,000	150,000
Common stock, $.01 par value; Authorized shares - 100,000,000; Issued shares – 45,595,669 and 49,504,079 at June 30, 2017 and December 31, 2016, respectively	502	496
Additional paid-in capital	963,732	961,305
Retained earnings	1,228,924	1,090,500
Treasury stock – shares at cost: 417 at June 30, 2018 and December 31, 2017	(8)	(8)
Accumulated other comprehensive income, net of taxes	380	428
Total stockholders’ equity	2,343,530	2,202,721
Total liabilities and stockholders’ equity	$ 27,781,910	$ 25,075,645

XML

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Loans held for sale	$ 1,275,466	$ 1,007,695
Preferred stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares issued	6,000,000	6,000,000
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	50,151,481	49,643,761
Treasury Stock, shares	417	417

XML

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income
Interest and fees on loans	$ 279,447	$ 201,646	$ 523,311	$ 378,270
Investment securities	193	287	399	512
Federal funds sold and securities purchased under resale agreements	745	434	1,790	964
Interest-bearing deposits in other banks	6,467	5,824	15,221	12,391
Total interest income	286,852	208,191	540,721	392,137
Interest expense
Deposits	39,607	16,533	71,309	29,826
Federal funds purchased	1,665	726	2,634	978
Other borrowings	8,484	2,901	14,164	4,922
Subordinated notes	4,191	4,191	8,382	8,382
Trust preferred subordinated debentures	1,193	881	2,220	1,711
Total interest expense	55,140	25,232	98,709	45,819
Net interest income	231,712	182,959	442,012	346,318
Provision for credit losses	27,000	13,000	39,000	22,000
Net interest income after provision for credit losses	204,712	169,959	403,012	324,318
Non-interest income
Service charges on deposit accounts	3,005	3,067	6,142	6,112
Wealth management and trust fee income	2,007	1,402	3,931	2,759
Bank owned life insurance (BOLI) income	657	481	1,316	947
Brokered loan fees	5,815	5,809	10,983	11,487
Servicing income	4,967	3,700	10,459	5,901
Swap fees	1,352	954	2,914	2,757
Other	(524)	3,356	1,481	5,916
Total non-interest income	17,279	18,769	37,226	35,879
Non-interest expense
Salaries and employee benefits	72,404	63,154	144,941	126,157
Net occupancy expense	7,356	6,515	14,590	12,626
Marketing	10,236	6,157	18,913	11,107
Legal and professional	11,654	7,127	19,184	14,580
Communications and technology	7,143	11,906	13,776	18,412
FDIC insurance assessment	6,257	4,603	12,360	10,597
Servicing related expenses	4,367	2,682	8,172	4,432
Allowance and other carrying costs for other real estate owned (OREO)	176	71	2,331	210
Other	12,538	9,599	24,824	19,787
Total non-interest expense	132,131	111,814	259,091	217,908
Income before income taxes	89,860	76,914	181,147	142,289
Income tax expense	18,424	25,819	37,766	48,652
Net income	71,436	51,095	143,381	93,637
Preferred stock dividends	2,437	2,437	4,875	4,875
Net income available to common stockholders	68,999	48,658	138,506	88,762
Other comprehensive income (loss)
Change in net unrealized gain on available-for-sale debt securities arising during period, before-tax	(104)	(33)	(167)	(30)
Income tax expense (benefit) related to net unrealized gain on available-for-sale debt securities	(22)	(11)	(35)	(10)
Other comprehensive income (loss), net of tax	(82)	(22)	(132)	(20)
Comprehensive income	$ 71,354	$ 51,073	$ 143,249	$ 93,617
Basic earnings per common share (usd per share)	$ 1.39	$ 0.98	$ 2.79	$ 1.79
Diluted earnings per common share (usd per share)	$ 1.38	$ 0.97	$ 2.76	$ 1.77

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net of Taxes
Stockholders' equity, beginning balance at Dec. 31, 2016	$ 2,009,557	$ 150,000	$ 495	$ 955,468	$ 903,187	$ (8)	$ 415
Shares, outstanding, beginning balance at Dec. 31, 2016		6,000,000	49,504,079			417
Comprehensive income:
Net income	93,637				93,637
Change in unrealized gain on available-for-sale securities, net of taxes	(20)						(20)
Total comprehensive income	93,617
Stock-based compensation expense recognized in earnings	3,461			3,461
Preferred stock dividend	(4,875)				(4,875)
Issuance of common stock related to warrants - value			33,595
Issuance of stock related to stock-based awards - value	(1,207)		$ (1)	(1,208)
Issuance of stock related to stock-based awards - shares			57,995
Stockholders' equity, ending balance at Jun. 30, 2017	2,100,553	$ 150,000	$ 496	957,721	991,949	$ (8)	395
Shares, outstanding, ending balance at Jun. 30, 2017		6,000,000	49,595,669.000			417
Stockholders' equity, beginning balance at Dec. 31, 2017	2,202,721	$ 150,000	$ 496	961,305	1,090,500	$ (8)	428
Shares, outstanding, beginning balance at Dec. 31, 2017		6,000,000	49,643,761			417
Comprehensive income:
Net income	143,381				143,381
Change in unrealized gain on available-for-sale securities, net of taxes	(132)						(132)
Total comprehensive income	143,249
Stock-based compensation expense recognized in earnings	4,091			4,091
Preferred stock dividend	(4,875)				(4,875)
Issuance of common stock related to warrants - value			436,648
Issuance of common stock related to warrants - shares	0		$ (5)	(5)
Issuance of stock related to stock-based awards - value	(1,658)		$ (1)	(1,659)
Issuance of stock related to stock-based awards - shares			71,072
Stockholders' equity, ending balance at Jun. 30, 2018	2,343,530	$ 150,000	$ 502	$ 963,732	1,228,924	$ (8)	380
Shares, outstanding, ending balance at Jun. 30, 2018		6,000,000	50,151,481			417
Impact of adoption of new accounting standards	$ 2				$ (82)		$ 84

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Income tax expense (benefit) related to net unrealized gain on available-for-sale debt securities	$ (22)	$ (11)	$ (35)	$ (10)

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Income from continuing operations	$ 143,381	$ 93,637
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	39,000	22,000
Depreciation and amortization	16,214	12,346
Decrease in valuation allowance on mortgage servicing rights	(757)	0
Bank owned life insurance (BOLI) income	(1,316)	(947)
Stock-based compensation expense	11,197	8,954
Purchases and originations of loans held for sale	(3,205,483)	(2,843,690)
Proceeds from sales and repayments of loans held for sale	2,908,777	2,939,002
Proceeds from sale of MSRs	22,439	0
Net (gain) loss on sale of loans held for sale and other assets	7,648	93
Technology write-off	0	5,285
Increase in OREO valuation allowance	2,000	0
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(97,710)	(46,025)
Accrued interest payable and other liabilities	(14,289)	(488)
Net cash provided by (used in) operating activities	(168,899)	190,167
Investing activities
Purchases of investment securities	(3,323)	(96,871)
Maturities and calls of available-for-sale securities	349	275
Principal payments received on available-for-sale securities	1,644	2,397
Originations of mortgage finance loans	(45,661,608)	(37,251,933)
Proceeds from pay-offs of mortgage finance loans	45,046,710	36,565,671
Net increase in loans held for investment, excluding mortgage finance loans	(1,213,641)	(1,297,460)
Purchase of premises and equipment, net	(5,212)	(4,194)
Proceeds from sale of foreclosed assets	216	272
Net cash provided by investing activities	(1,834,865)	(2,081,843)
Financing activities
Net increase in deposits	1,211,691	275,392
Costs from issuance of stock related to stock-based awards and warrants	(1,658)	(1,207)
Preferred dividends paid	(4,875)	(4,875)
Net increase in other borrowings	1,200,000	700,000
Net increase in Federal funds purchased and repurchase agreements	155,809	352,649
Net cash provided by financing activities	2,560,967	1,321,959
Net increase (decrease) in cash and cash equivalents	557,203	(569,717)
Cash and cash equivalents at beginning of period	2,905,591	2,839,352
Cash and cash equivalents at end of period	3,462,794	2,269,635
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	95,121	45,071
Cash paid during the period for income taxes	49,770	52,042
Transfers from loans/leases to OREO and other repossessed assets	$ 0	$ 0

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OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Operations and summary of significant accounting policies

OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization and Nature of Business

Texas Capital Bancshares, Inc. (the “Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the “Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional and national clientèle of commercial borrowers. We are primarily a secured lender with a majority of our loans being made to businesses headquartered or with operations in Texas. At the same time, our national lines of business continue to provide specialized lending products to businesses throughout the United States.

Basis of Presentation

Our accounting and reporting policies conform to accounting principles generally accepted in the United States (“GAAP”) and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation.

The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2017, included in our Annual Report on Form 10-K filed with the SEC on February 14, 2018 (the “2017 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.

Accounting Changes

ASU 2018-02 "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02") allows a reclassification from accumulated other comprehensive income (loss) ("AOCI") to retained earnings for the stranded tax effects caused by the revaluation of deferred taxes resulting from the newly enacted corporate tax rate in the Tax Cuts and Jobs Act. The ASU is effective in years beginning after December 15, 2018, but permits early adoption in a period for which financial statements have not yet been issued. We have elected to early adopt the ASU as of January 1, 2018. The adoption of the guidance resulted in an insignificant cumulative-effect adjustment that decreased retained earnings and increased AOCI in the first quarter of 2018.

ASU 2016-15 "Statement of Cash Flows (Topic 230)" ("ASU 2016-15") is intended to reduce the diversity in practice around how certain transactions are classified within the statement of cash flows. ASU 2016-15 became effective for us on January 1, 2018 and did not have a significant impact on our financial statements.

ASU 2016-01 "Financial Instruments - Overall (Subtopic 825-10): Recognition of Financial Assets and Financial Liabilities, ("ASU 2016-01") makes targeted amendments to the guidance for recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 requires equity investments, other than equity method investments, to be measured at fair value with changes in fair value recognized in net income. The ASU requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption to reclassify the cumulative change in fair value of equity securities previously recognized in AOCI. ASU 2016-01 became effective for us on January 1, 2018. The adoption of the guidance resulted in an insignificant cumulative-effect adjustment that increased retained earnings, with offsetting related adjustments to deferred taxes and AOCI. ASU 2016-01 also emphasizes the existing requirement to use exit prices to measure fair value for disclosure purposes and clarifies that entities should not make use of a practicability exception in determining the fair value of loans. Accordingly, we refined the calculation used to determine the disclosed fair value of our loans held for investment portfolio as part of adopting this standard. The refined calculation did not have a significant impact on our fair value disclosures. See Note 11 - Fair Value Disclosures.

ASU 2014-09 "Revenue from Contracts with Customers (Topic 606)" ("ASU 2014-09") implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. The guidance does not apply to revenue associated with financial instruments, including loans and investment securities that are accounted for under other GAAP, which comprises a significant portion of our revenue stream. ASU 2014-09 became effective for us on January 1, 2018 and had no material effect on how we recognize revenue or to our consolidated financial statements and disclosures. See below for additional information related to revenue generated from contracts with customers.

Revenue Recognition

Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the entity's contracts to provide goods or services to customers. The core principle requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied.

The majority of our revenue-generating transactions are not subject to ASC 606, including revenue generated from financial instruments, such as our loans, letters of credit, derivatives and investment securities, as well as revenue related to our mortgage servicing activities, as these activities are subject to other GAAP discussed elsewhere within our disclosures. Descriptions of our revenue-generating activities that are within the scope of ASC 606, which are presented in our income statements as components of non-interest income are as follows:

• Service charges on deposit accounts - these represent general service fees for monthly account maintenance and activity- or transaction-based fees and consist of transaction-based revenue, time-based revenue (service period), item-based revenue or some other individual attribute-based revenue. Revenue is recognized when our performance obligation is completed which is generally monthly for account maintenance services or when a transaction has been completed (such as a wire transfer). Payments for such performance obligations are generally received at the time the performance obligations are satisfied.

• Wealth management and trust fee income - this represents monthly fees due from wealth management customers as consideration for managing the customers' assets. Wealth management and trust services include custody of assets, investment management, escrow services, fees for trust services and similar fiduciary activities. Revenue is recognized when our performance obligation is completed each month, which is generally the time that payment is received. Also included are fees received from a third party broker-dealers as part of a revenue-sharing agreement for fees earned from customers that we refer to the third party. These fees are paid to us by the third party on a quarterly basis and recognized ratably throughout the quarter as our performance obligation is satisfied.

• Brokered loan fees - these represent fees for the administration and funding of purchased mortgage loan interests as well as facility renewal and application fees received from mortgage originator customers in our warehouse lending business. Also included are fees received from independent correspondent mortgage lenders as consideration for our purchase of individual residential mortgage loans through our Mortgage Correspondent Aggregation ("MCA") business. Revenue related to the warehouse lending business is recognized when the related loan interest is disposed (i.e., through sale or payoff) or upon receipt of the facility renewal or application. Revenue related to our MCA business is recognized at the time a loan is purchased.

• Other non-interest income primarily includes items such as letter of credit fees, gains on sale of loans held for sale and servicing fees related to the MCA program, none of which are subject to the requirements of ASC 606.

Investment Securities

Investment securities includes available-for-sale debt securities and equity securities at fair value.

Debt Securities

Debt securities are classified as trading, available-for-sale or held-to-maturity. Management classifies debt securities at the time of purchase and re-assesses such designation at each balance sheet date; however, transfers between categories from this re-assessment are rare.

Trading Account

Debt securities acquired for resale in anticipation of short-term market movements are classified as trading, with realized and unrealized gains and losses recognized in income. To date, we have not had any activity in our trading account.

Held-to-Maturity

Debt securities are classified as held to maturity when we have the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost. Debt securities not classified as held-to-maturity or trading are classified as available-for-sale.

Available-for-Sale

Available-for-sale debt securities are stated at fair value, with the unrealized gains and losses reported as a separate component of AOCI, net of tax. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, or in the case of mortgage-backed securities, over the estimated life of the security. Such amortization and accretion is included in interest income from securities. Realized gains and losses and declines in value judged to be other-than-temporary are included in gain (loss) on sale of securities. The cost of securities sold is based on the specific identification method.

All debt securities are available-for-sale as of June 30, 2018 and December 31, 2017.

Equity Securities

Beginning January 1, 2018, upon adoption of ASU 2016-01, equity securities with readily determinable fair values are stated at fair value with realized and unrealized gains and losses reported in other non-interest income in the consolidated statements of income and other comprehensive income. For periods prior to January 1, 2018, equity securities were classified as available-for-sale and stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. Equity securities without readily determinable fair values are recorded at cost less any impairment, if any.

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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of stock-based compensation awards, the fair value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

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EARNINGS PER COMMON SHARE

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE

The following table presents the computation of basic and diluted earnings per share (in thousands except share data):

	Three months ended   June 30,				Six months ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	71,436	$	51,095	$	143,381	$	93,637
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	68,999		48,658		$	138,506	88,762
Denominator:
Denominator for basic earnings per share—weighted average shares	49,736,384		49,576,837		49,695,783		49,556,393
Effect of employee stock-based awards(1)	348,762		224,306		336,285		244,058
Effect of warrants to purchase common stock	10,869		428,527		112,884		432,660
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,096,015		50,229,670		50,144,952		50,233,111
Basic earnings per common share	$	1.39	$	0.98	$	2.79	$	1.79
Diluted earnings per common share	$	1.38	$	0.97	$	2.76	$	1.77

(1) SARs and RSUs outstanding of 4,000 at June 30, 2018 and 6,200 at June 30, 2017 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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SECURITIES

6 Months Ended

Jun. 30, 2018

Available-for-sale Securities [Abstract]

INVESTMENT SECURITIES

Available-for-Sale Debt Securities

The following is a summary of available-for-sale debt securities (in thousands):

	June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	8,304	$	481	$	—	$	8,785
	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	10,297	$	648	$	—	$	10,945

The amortized cost and estimated fair value of available-for-sale debt securities are presented below by contractual maturity (in thousands, except percentage data):

	June 30, 2018
	Less Than One Year		After One Through Five Years		After Five Through Ten Years		After Ten Years		Total
Residential mortgage-backed securities:(1)
Amortized cost	50		1,895		—		6,359		8,304
Estimated fair value	52		2,038		—		6,695		8,785
Weighted average yield(2)	5.24	%	5.55	%	—	%	3.75	%	4.17	%

	December 31, 2017
	Less Than One Year			After One Through Five Years			After Five Through Ten Years			After Ten Years			Total
Residential mortgage-backed securities:(1)
Amortized cost	$	409		$	819		$	1,502		$	7,567		$	10,297
Estimated fair value	418			916			1,636			7,975			10,945
Weighted average yield(2)	4.59		%	6.02		%	5.32		%	3.45		%	3.97		%

(1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

(2) Yields are calculated based on amortized cost.

As of June 30, 2018 and December 31, 2017, we did not have any available-for-sale debt securities in an unrealized loss position.

At June 30, 2018, available-for-sale debt securities with carrying values of $2.0 million and $5.8 million were pledged to secure certain deposits and repurchase agreements, respectively.

Equity Securities

Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. At June 30, 2018 and December 31, 2017, we had $15.6 million and $12.6 million, respectively, in equity securities recorded at fair value. Prior to January 1, 2018, equity securities were stated at fair value with unrealized gains and losses reported as a separate component of AOCI, net of tax. At December 31, 2017, net unrealized gains of $10,000 had been recognized in AOCI. On January 1, 2018, these unrealized gains and losses were reclassified out of AOCI and into retained earnings with subsequent changes in fair value being recognized in other non-interest income. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2018 (in thousands):

	Three months ended			Six months ended
	June 30, 2018			June 30, 2018
Net gains and (losses) recognized during the period on equity securities	$	108		$	(104	)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period	162			162
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date	$	(54	)	$	(266	)

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LOANS AND ALLOWANCE FOR LOAN LOSSES

6 Months Ended

Jun. 30, 2018

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Loans and allowance for credit losses

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR LOAN LOSSES

At June 30, 2018 and December 31, 2017, loans held for investment were as follows (in thousands):

	June 30, 2018			December 31, 2017
Commercial	$	10,189,832		$	9,189,811
Mortgage finance	5,923,058			5,308,160
Construction	2,226,590			2,166,208
Real estate	3,868,411			3,794,577
Consumer	46,652			48,684
Leases	314,575			264,903
Gross loans held for investment	22,569,118			20,772,343
Deferred income (net of direct origination costs)	(109,339		)	(97,931		)
Allowance for loan losses	(179,096		)	(184,655		)
Total loans held for investment, net	$	22,280,683		$	20,489,757

Commercial Loans and Leases. Our commercial loan portfolio is comprised of lines of credit for working capital and term loans and leases to finance equipment and other business assets. Our energy production loans are generally collateralized with proven reserves based on appropriate valuation standards and take into account the risk of oil and gas price volatility. Our commercial loans and leases are underwritten after carefully evaluating and understanding the borrower’s ability to operate profitably. Our underwriting standards are designed to promote relationship banking rather than to make loans on a transaction basis. Our lines of credit typically are limited to a percentage of the value of the assets securing the line. Lines of credit and term loans typically are reviewed annually, or more frequently, as needed, and are supported by accounts receivable, inventory, equipment and other assets of our clients’ businesses.

Mortgage Finance Loans. Our mortgage finance loans consist of ownership interests purchased in single-family residential mortgages funded through our mortgage finance group. We have agreements with mortgage lenders and purchase interests in individual loans they originate. The ownership interests collateralizing our mortgage finance loans are typically held on our balance sheet for 10 to 20 days, and substantially all loans are conforming loans. Substantially all mortgage loans are underwritten consistently with established programs for permanent financing with financially sound investors. Balances as of June 30, 2018 and December 31, 2017 are stated net of $242.7 million and $171.2 million of participations sold, respectively.

Construction Loans. Our construction loan portfolio consists primarily of single- and multi-family residential properties and commercial projects used in manufacturing, warehousing, service or retail businesses. Our construction loans generally have terms of one to three years. We typically make construction loans to developers, builders and contractors that have an established record of successful project completion and loan repayment and have a substantial equity investment in the borrowers. Loan amounts are derived primarily from the Bank's evaluation of expected cash flows available to service debt from stabilized projects under hypothetically stressed conditions. Construction loans are also based in part upon estimates of costs and value associated with the completed project. Sources of repayment for these types of loans may be permanent loans from other lenders, sales of developed property, or an interim loan commitment from us until permanent financing is obtained. The nature of these loans makes ultimate repayment sensitive to overall economic conditions. Borrowers may not be able to correct conditions of loan defaults, increasing risk of exposure to classification, non-performing status, reserve allocation and actual credit loss and foreclosure. These loans typically have floating rates and require commitment fees.

Real Estate Loans. A portion of our real estate loan portfolio is comprised of loans secured by properties other than market risk or investment-type real estate. Market risk loans are real estate loans where the primary source of repayment is expected to come from the sale, permanent financing or lease of the real property collateral. We generally provide temporary financing for commercial and residential property. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Our real estate loans generally have maximum terms of five to seven years, and we provide loans with both floating and fixed rates. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Appraised values may be highly variable due to market conditions and the impact of the inability of potential purchasers and lessees to obtain financing and a lack of transactions at comparable values.

At June 30, 2018 and December 31, 2017, we had a blanket floating lien on certain real estate-secured loans, mortgage finance loans and certain investment securities used as collateral for Federal Home Loan Bank borrowings.

Summary of Loan Loss Experience

The allowance for loan losses is comprised of general reserves, specific reserves for impaired loans and an additional qualitative reserve based on our estimate of losses inherent in the portfolio at the balance sheet date, but not yet identified with specified loans. We consider the allowance at June 30, 2018 to be appropriate, given management's assessment of losses inherent in the portfolio as of the evaluation date, the significant growth in the loan and lease portfolio, current economic conditions in our market areas and other factors.

The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	9,945,020	$	5,923,058	$	2,211,981	$	3,778,808	$	46,493	$	299,825	$	22,205,185
Special mention	87,297		—		14,609		56,003		—		—		157,909
Substandard-accruing	77,929		—		—		31,057		93		13,650		122,729
Non-accrual	79,586		—		—		2,543		66		1,100		83,295
Total loans held for investment	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	8,967,471	$	5,308,160	$	2,152,654	$	3,706,541	$	48,591	$	249,865	$	20,433,282
Special mention	19,958		—		13,554		53,652		—		495		87,659
Substandard-accruing	102,651		—		—		32,671		93		14,543		149,958
Non-accrual	99,731		—		—		1,713		—		—		101,444
Total loans held for investment	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343

The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018 and 2017. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.

June 30, 2018
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	118,806	$	—	$	19,273		$	34,287		$	357		$	3,542		$	8,390		$	184,655
Provision for loan losses	38,920		—		621			928			(205		)	860			(3,511		)	37,613
Charge-offs	43,972		—		—			—			—			—			—			43,972
Recoveries	680		—		—			32			68			20			—			800
Net charge-offs (recoveries)	43,292		—		—			(32		)	(68		)	(20		)	—			43,172
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
Period end amount allocated to:
Loans individually evaluated for impairment	$	11,772	$	—	$	—		$	73		$	11		$	495		$	—		$	12,351
Loans collectively evaluated for impairment	102,662		—		19,894			35,174			209			3,927			4,879			166,745
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
June 30, 2017
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	128,768	$	—	$	13,144		$	19,149		$	241		$	1,124		$	5,700		$	168,126
Provision for loan losses	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225

The table below presents the activity in the allowance for off-balance sheet credit losses related to unfunded commitments for the three and six months ended June 30, 2018 and 2017 (in thousands). This allowance is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Beginning balance	$	9,623	$	10,847		$	9,071	$	11,422
Provision for off-balance sheet credit losses	835		(1,642		)	1,387		(2,217		)
Ending balance	$	10,458	$	9,205		$	10,458	$	9,205

We have traditionally maintained an additional qualitative reserve component to compensate for the uncertainty and complexity in estimating loan and lease losses including factors and conditions that may not be fully reflected in the determination and application of the allowance allocation percentages. The decrease in the additional qualitative reserve at June 30, 2018 as compared to December 31, 2017 was primarily related to the resolution of remaining uncertainty regarding the impact to our loan portfolio from Hurricanes Harvey and Irma. We believe the level of additional qualitative reserves at June 30, 2018 is warranted due to uncertainties and unpredictable factors that have produced losses, including those resulting from borrowers' misstatement of financial information or inaccurate certification of collateral values. Such losses are not necessarily correlated with historical loss trends or general economic conditions. Our methodology used to calculate the allowance considers historical losses; however, the historical loss rates for specific product types or credit risk grades may not fully incorporate the effects of uncertainties or unpredictable events.

Our recorded investment in loans as of June 30, 2018, December 31, 2017 and June 30, 2017 related to each balance in the allowance for loan losses by portfolio segment and disaggregated on the basis of our impairment methodology was as follows (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	80,171	$	—	$	—	$	2,543	$	66	$	1,100	$	83,880
Loans collectively evaluated for impairment	10,109,661		5,923,058		2,226,590		3,865,868		46,586		313,475		22,485,238
Total	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	100,676	$	—	$	—	$	2,008	$	—	$	—	$	102,684
Loans collectively evaluated for impairment	9,089,135		5,308,160		2,166,208		3,792,569		48,684		264,903		20,669,659
Total	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343
June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886

We place loans on non-accrual when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, generally when a loan is 90 days past due. When a loan is placed on non-accrual status, all previously accrued and unpaid interest is reversed. Interest income is subsequently recognized on a cash basis as long as the remaining unpaid principal amount of the loan is deemed to be fully collectible. If collectability is questionable, then cash payments are applied to principal. As of both June 30, 2018 and December 31, 2017, none of our non-accrual loans were earning on a cash basis. A loan is placed back on accrual status when both principal and interest are current and it is probable that we will be able to collect all amounts due (both principal and interest) according to the terms of the loan agreement.

A loan held for investment is considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due (both principal and interest) according to the terms of the original loan agreement. In accordance with ASC 310, Receivables, we have also included all restructured and formerly restructured loans in our impaired loan totals. The following tables detail our impaired loans, by portfolio class, as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	27,521	$	52,966	$	—	$	12,449	$	133
Energy	16,373		17,549		—		20,393		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,042		1,042		—		1,074		—
Secured by 1-4 family	1,263		1,263		—		211		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	46,199	$	72,820	$	—	$	34,127	$	133
With an allowance recorded:
Commercial
Business loans	$	19,038	$	19,038	$	5,597	$	43,537	$	—
Energy	17,239		18,500		6,175		32,145		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	—		—		—		166		—
Secured by 1-4 family	238		238		73		138		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans with an allowance recorded	$	37,681	$	38,947	$	12,351	$	76,314	$	—
Combined:
Commercial
Business loans	$	46,559	$	72,004	$	5,597	$	55,986	$	133
Energy	33,612		36,049		6,175		52,538		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	1,042		1,042		—		1,240		—
Secured by 1-4 family	1,501		1,501		73		349		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans	$	83,880	$	111,767	$	12,351	$	110,441	$	133

December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	16,835	$	18,257	$	—	$	22,964	$	—
Energy	21,426		22,602		—		36,579		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,096		1,096		—		2,166		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	39,357	$	41,955	$	—	$	61,709	$	—
With an allowance recorded:
Commercial
Business loans	$	18,645	$	19,020	$	2,544	$	16,960	$	—
Energy	43,770		55,875		21,772		50,867		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	499		499		75		166		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans with an allowance recorded	$	63,327	$	75,807	$	24,417	$	69,068	$	6
Combined:
Commercial
Business loans	$	35,480	$	37,277	$	2,544	$	39,924	$	—
Energy	65,196		78,477		21,772		87,446		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	1,595		1,595		75		2,332		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans	$	102,684	$	117,762	$	24,417	$	130,777	$	6

Average impaired loans outstanding during the six months ended June 30, 2018 and 2017 totaled $110.4 million and $149.5 million, respectively.

The table below provides an age analysis of our loans held for investment as of June 30, 2018 (in thousands):

	30-59 Days Past Due		60-89 Days Past Due		Greater Than 90 Days and Accruing(1)		Total Past Due		Non-accrual		Current		Total
Commercial
Business loans	$	14,114	$	17,188	$	6,203	$	37,505	$	45,974	$	8,750,741	$	8,834,220
Energy	24,900		—		—		24,900		33,612		1,297,100		1,355,612
Mortgage finance loans	—		—		—		—		—		5,923,058		5,923,058
Construction
Market risk	489		—		—		489		—		2,151,838		2,152,327
Commercial	—		—		—		—		—		41,991		41,991
Secured by 1-4 family	—		1,610		—		1,610		—		30,662		32,272
Real estate
Market risk	1,337		—		661		1,998		—		2,728,753		2,730,751
Commercial	639		—		—		639		1,042		814,188		815,869
Secured by 1-4 family	2,745		152		493		3,390		1,501		316,900		321,791
Consumer	2		—		—		2		66		46,584		46,652
Leases	—		—		—		—		1,100		313,475		314,575
Total loans held for investment	$	44,226	$	18,950	$	7,357	$	70,533	$	83,295	$	22,415,290	$	22,569,118

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.0 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.

Restructured loans are loans on which, due to the borrower’s financial difficulties, we have granted a concession that we would not otherwise consider for borrowers of similar credit quality. This may include a transfer of real estate or other assets from the borrower, a modification of loan terms, or a combination of the two. Modifications of terms that could potentially qualify as a restructuring include reduction of the contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, a reduction of the face amount of debt or forgiveness of either principal or accrued interest. At June 30, 2018 and December 31, 2017, we did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at June 30, 2018 and December 31, 2017, $9.0 million and $18.8 million, respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates. A loan continues to qualify as restructured until a consistent payment history or change in borrower’s financial condition has been evidenced, generally over no less than twelve months. Assuming that the restructuring agreement specifies an interest rate at the time of the restructuring that is greater than or equal to the rate that we are willing to accept for a new extension of credit with comparable risk, then the loan no longer has to be considered a restructuring if it is in compliance with the modified terms in calendar years after the year of the restructure.

The following table summarizes the loans that were restructured during the six months endedJune 30, 2018 and 2017 (in thousands):

As of and for the six months ended June 30, 2018
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,370	$	1,370
Total new restructured loans	1	$	1,370	$	1,370
As of and for the six months ended June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	599		672
Total new restructured loans	2	$	1,669	$	1,372

The restructured loans generally include terms to temporarily place loans on interest only, extend the payment terms or reduce the interest rate. We did not forgive any principal on the above loans. The restructuring of the loans did not have a significant impact on our allowance for loan losses at June 30, 2018 or 2017.

The following table provides information on how loans were modified as restructured during the six months ended June 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018		2017
Extended maturity	$	—	$	1,372
Adjusted payment schedule	1,370		—
Total	$	1,370	$	1,372

As of June 30, 2018 and 2017, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO

6 Months Ended

Jun. 30, 2018

Real Estate Owned, Disclosure of Detailed Components [Abstract]

OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO

OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO

The table below presents a summary of the activity related to OREO (in thousands):

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Beginning balance	$	9,558		$	18,833		$	11,742		$	18,961
Additions	—			—			—			—
Sales	(32		)	(144		)	(216		)	(272		)
Valuation allowance for OREO	—			—			(2,000		)	—
Ending balance	$	9,526		$	18,689		$	9,526		$	18,689

When foreclosure occurs, the acquired asset is recorded at fair value less selling costs, generally based on appraised value, which may result in partial charge-off of the loan. Subsequent write-downs required for declines in value are recorded through a valuation allowance or taken directly against the asset and charged to other non-interest expense.

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CERTAIN TRANSFERS OF FINANCIAL ASSETS

6 Months Ended

Jun. 30, 2018

Transfers and Servicing [Abstract]

CERTAIN TRANSFERS OF FINANCIAL ASSETS

CERTAIN TRANSFERS OF FINANCIAL ASSETS

Through our MCA business, we commit to purchase residential mortgage loans from independent correspondent lenders and deliver those loans into the secondary market via whole loan sales to independent third parties or in securitization transactions to Ginnie Mae and government sponsored entities ("GSEs") such as Fannie Mae and Freddie Mac. We have elected to carry these loans at fair value based on sales commitments, market quotes or pricing models. Gains and losses on the sale of mortgage loans held for sale and changes in the fair value of the loans held for sale and related derivatives are included in other non-interest income on the consolidated statements of income and other comprehensive income. For the six months endedJune 30, 2018 and 2017, losses totaled $7.4 million and $93,000, respectively.

Residential mortgage loans held for sale are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially mitigated through forward sales contracts, which set the price for loans that will be delivered in the next 60 to 90 days.

The table below presents the unpaid principal balance of loans held for sale and related fair values at June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018		December 31, 2017
Outstanding balance(1)	$	1,273,889	$	1,009,271
Fair value(1)	1,275,466		1,007,695
Fair value over/(under) outstanding balance	$	1,577	$	(1,576	)

(1) Does not include $1.3 million and $3.3 million of Small Business Administration ("SBA") loans held for sale carried at lower of cost or market as of June 30, 2018 and December 31, 2017.

No loans held for sale were on non-accrual as of June 30, 2018 or December 31, 2017. At June 30, 2018 and December 31, 2017, we had $27.9 million and $19.7 million, respectively, in outstanding balances of loans held for sale that were 90 days or more past due. The $27.9 million loans held for sale that were 90 days or more past due at June 30, 2018 included $24.1 million in loans guaranteed by U.S. government agencies that were repurchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet. Interest on these past due loans accrues at the debenture rate guaranteed by the U.S. government. Also included in the $27.9 million were $3.1 million in loans that, pursuant to Ginnie Mae servicing guidelines, we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met, and therefore must record as loans held for sale on our balance sheet regardless of whether the repurchase option has been exercised. The comparable balances at December 31, 2017 were no loans repurchased and $19.0 million in loans for which we have the unilateral right but not the obligation to repurchase.

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018			2017
Beginning balance(1)	$	1,011,004		$	968,929
Loans purchased	3,205,483			2,843,690
Payments and loans sold(1)	(2,942,872		)	(2,976,523		)
Change in fair value	3,153			9,921
Ending balance	$	1,276,768		$	846,017

(1) Includes $1.3 million and $3.3 million of SBA loans held for sale carried at lower of cost or market at June 30, 2018 and December 31, 2017.

We generally retain the right to service the loans sold, creating MSRs which are recorded as assets on our balance sheet. A summary of MSR activity for the six months endedJune 30, 2018 and 2017 is as follows (in thousands):

	Six months ended June 30,
	2018			2017
MSRs:
Balance, beginning of year	$	88,150		$	28,536
Capitalized servicing rights	26,656			37,343
Amortization	(5,288		)	(2,856		)
Sales	(26,742		)	—
Balance, end of period	$	82,776		$	63,023
Valuation allowance:
Balance, beginning of year	$	2,823		$	—
Increase (decrease) in valuation allowance	(2,823		)	—
Balance, end of period	$	—		$	—
MSRs, net(1)	$	82,776		$	63,023
MSRs, fair value	$	90,179		$	64,889

(1) MSRs are reported on the consolidated balance sheets at amortized cost, less a valuation allowance if the fair value of identified strata, determined by interest rates, within the MSR portfolio are determined to have a fair value that is less than amortized cost.

We completed a sale of Ginnie Mae MSRs in the first quarter of 2018. In anticipation of this sale, the fair value of the MSRs at December 31, 2017 was adjusted, resulting in a $2.8 million impairment charge taken in the fourth quarter of 2017.

At June 30, 2018 and December 31, 2017, our servicing portfolio of residential mortgage loans had an outstanding principal balance of $7.1 billion and $7.0 billion, respectively. In connection with the servicing of these loans, we hold deposits in the names of the investors who own the loans representing escrow funds for taxes and insurance, as well as collections in transit to the investors. These escrow funds are segregated and held in separate non-interest-bearing accounts at the Bank. These deposits, included in total non-interest-bearing deposits on the consolidated balance sheets, were $84.5 million at June 30, 2018 and $73.4 million at December 31, 2017.

The estimated fair value of the MSR assets is obtained from an independent third party and reviewed by management on a quarterly basis. MSRs typically do not trade in an active, open market with readily observable prices; as such, the fair value of MSRs is determined using a discounted cash flow model to calculate the present value of the estimated future net servicing income. The assumptions utilized in the discounted cash flow model are based on market data for comparable assets, where available. Each quarter, management and the independent third party discuss the key assumptions used in the discounted cash flow model and make adjustments as necessary to estimate the fair value of the MSRs. As of June 30, 2018 and December 31, 2017, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2018		December 31, 2017
Average discount rates	9.61	%	9.90	%
Expected prepayment speeds	9.04	%	9.99	%
Weighted average life, in years	7.5		7.0

A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table (in thousands):

	June 30, 2018			December 31, 2017
50 bp adverse change in prepayment speed	$	(12,184	)	$	(11,896	)
100 bp adverse change in prepayment speed	(24,683		)	(28,226		)

These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined with confidence because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may be correlated with changes in other factors, which could impact the sensitivity analysis as presented.

In conjunction with the sale and securitization of loans held for sale, we may be exposed to liability resulting from recourse agreements and repurchase agreements. If it is determined subsequent to our sale of a loan that the loan sold is in breach of the representations or warranties made in the applicable sale agreement, we may have an obligation to either (a) repurchase the loan for the unpaid principal balance, accrued interest and related advances, (b) indemnify the purchaser against any loss it suffers or (c) make the purchaser whole for the economic benefits of the loan.

Our repurchase, indemnification and make whole obligations vary based upon the terms of the applicable agreements, the nature of the asserted breach and the status of the mortgage loan at the time a claim is made. We establish reserves for estimated losses of this nature inherent in the origination of mortgage loans by estimating the losses inherent in the population of all loans sold based on trends in claims and actual loss severities experienced. The reserve includes accruals for probable contingent losses in addition to those identified in the pipeline of claims received. The estimation process is designed to include amounts based on any actual losses experienced from actual repurchase activity.

Our estimated exposure related to loans previously sold and currently held for sale was $1.5 million at June 30, 2018 and $1.3 million at December 31, 2017 and is recorded in other liabilities in the consolidated balance sheets. We had $148,000 in losses due to repurchase, indemnification and make-whole obligations during the six months endedJune 30, 2018 and $7,000 in losses during the six months endedJune 30, 2017.

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

6 Months Ended

Jun. 30, 2018

Risks and Uncertainties [Abstract]

FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

The Bank is a 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 that involve varying degrees of credit risk in excess of the amount recognized in the consolidated balance sheets. The Bank’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of these instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower.

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. Since many of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer’s credit-worthiness on a case-by-case basis.

Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

The table below summarizes our off-balance sheet financial instruments whose contract amounts represented credit risk (in thousands):

	June 30, 2018		December 31, 2017
Commitments to extend credit	$	7,254,475	$	6,957,847
Standby letters of credit	244,962		230,958

At June 30, 2018 and December 31, 2017, we had $10.5 million and $9.1 million, respectively, in allowance for off-balance sheet credit losses related to these off-balance sheet commitments recorded in other liabilities in the consolidated balance sheets.

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REGULATORY MATTERS

6 Months Ended

Jun. 30, 2017

Regulatory Capital Requirements [Abstract]

REGULATORY MATTERS

REGULATORY MATTERS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory (and possibly additional discretionary) actions by regulators that, if undertaken, could have a direct material adverse effect on the Company’s and the Bank’s 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 the Company’s and the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

The Basel III regulatory capital framework (the "Basel III Capital Rules") adopted by U.S. federal regulatory authorities, among other things, (i) establishes the capital measure called "Common Equity Tier 1" ("CET1"), (ii) specifies that Tier 1 capital consist of CET1 and "Additional Tier 1 Capital" instruments meeting stated requirements, (iii) requires that most deductions/adjustments to regulatory capital measures be made to CET1 and not to other components of capital and (iv) defines the scope of the deductions/adjustments to the capital measures. The Basel III Capital Rules became effective for us on January 1, 2015 with certain transition provisions fully phasing in over a period ending on January 1, 2019.

Additionally, the Basel III Capital Rules require that we maintain a capital conservation buffer with respect to each of CET1, Tier 1 and total capital to risk-weighted assets, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. The capital conservation buffer is subject to a three year phase-in period that began on January 1, 2016 and will be fully phased in on January 1, 2019 at 2.5%. The required phase-in capital conservation buffer during 2018 is 1.875% and was 1.25% during 2017. A financial institution with a conservation buffer of less than the required amount is subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers.

Quantitative measures established by these regulations to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of CET1, Tier 1 and total capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of June 30, 2018, that the Company and the Bank met all capital adequacy requirements to which they are subject.

Financial institutions are categorized as well capitalized or adequately capitalized, based on minimum total risk-based, Tier 1 risk-based, CET1 and Tier 1 leverage ratios. As shown in the table below, the Company’s capital ratios exceeded the regulatory definition of adequately capitalized as of June 30, 2018 and December 31, 2017. Based upon the information in its most recently filed call report, the Bank met the capital ratios necessary to be well capitalized. The regulatory authorities can apply changes in classification of assets and such changes may retroactively subject the Company to changes in capital ratios. Any such changes could result in reducing one or more capital ratios below well-capitalized status. In addition, a change may result in imposition of additional assessments by the FDIC or could result in regulatory actions that could have a material adverse effect on our financial condition and results of operations.

Because our Bank had less than $15.0 billion in total consolidated assets as of December 31, 2009, we are allowed to continue to classify our trust preferred securities, all of which were issued prior to May 19, 2010, as Tier 1 capital.

The table below summarizes our actual and required capital ratios under the Basel III Capital Rules:

	Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount	Ratio
As of June 30, 2018:
CET1
Company	$	2,173,815	8.32	%	$	1,665,009	6.38	%	$	1,828,245	7.00	%	N/A	N/A
Bank	2,178,607		8.35	%	1,662,918		6.38	%	1,825,950		7.00	%	1,695,525	6.50	%
Total capital (to risk-weighted assets)
Company	2,902,789		11.11	%	2,579,132		9.88	%	2,742,368		10.50	%	N/A	N/A
Bank	2,749,018		10.54	%	2,575,893		9.88	%	2,738,925		10.50	%	2,608,500	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,431,650		9.31	%	2,056,776		7.88	%	2,220,012		8.50	%	N/A	N/A
Bank	2,336,442		8.96	%	2,054,193		7.88	%	2,217,225		8.50	%	2,086,800	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,431,650		9.89	%	983,476		4.00	%	983,476		4.00	%	N/A	N/A
Bank	2,336,442		9.51	%	982,989		4.00	%	982,989		4.00	%	1,228,736	5.00	%
As of December 31, 2017:
CET1
Company	$	2,033,830	8.45	%	$	1,384,448	5.75	%	$	1,685,464	7.00	%	N/A	N/A
Bank	1,992,152		8.28	%	1,383,475		5.75	%	1,684,231		7.00	%	1,563,929	6.50	%
Total capital (to risk-weighted assets)
Company	2,768,153		11.50	%	2,227,221		9.25	%	2,528,196		10.50	%	N/A	N/A
Bank	2,567,961		10.67	%	2,225,591		9.25	%	2,526,347		10.50	%	2,406,044	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,293,016		9.52	%	1,745,659		7.25	%	2,046,635		8.50	%	N/A	N/A
Bank	2,151,338		8.94	%	1,744,382		7.25	%	2,045,138		8.50	%	1,924,835	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,293,016		9.15	%	1,002,494		4.00	%	1,002,494		4.00	%	N/A	N/A
Bank	2,151,338		8.59	%	1,002,144		4.00	%	1,002,144		4.00	%	1,252,680	5.00	%

(1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, it should be noted that the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum.

Our mortgage finance loan volumes can increase significantly at month end, causing a meaningful difference between ending balance and average balance for any period. At June 30, 2018, our total mortgage finance loans were $5.9 billion compared to the average for the three months ended June 30, 2018 of $4.9 billion. As CET1, Tier 1 and total capital ratios are calculated using quarter-end risk-weighted assets and our mortgage finance loans are 100% risk-weighted (excluding MCA mortgage loans held for sale, which receive lower risk weights), the quarter-end fluctuation in these balances can significantly impact our reported ratios. Due to the actual risk profile and liquidity of this asset class, we manage capital allocated to mortgage finance loans based on changing trends in average balances and do not believe that the quarter-end balance is representative of risk characteristics that would justify higher allocations. However, we continue to monitor our capital allocation to confirm that all capital levels remain above well-capitalized levels.

Dividends that may be paid by subsidiary banks are routinely restricted by various regulatory authorities. The amount that can be paid in any calendar year without prior approval of the Bank’s regulatory agencies cannot exceed the lesser of the net profits (as defined) for that year plus the net profits for the preceding two calendar years, or retained earnings. The Basel III Capital Rules further limit the amount of dividends that may be paid by our Bank. No dividends were declared or paid on our common stock during the six months endedJune 30, 2018 or 2017.

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 2018

Compensation Related Costs [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

We have long-term incentive plans under which stock-based compensation awards are granted to employees and directors by the board of directors, or its designated committee. Grants are subject to vesting requirements and may include, among other things, nonqualified stock options, stock appreciation rights ("SARs"), restricted stock units ("RSUs"), restricted stock and performance units, or any combination thereof. There are 2,550,000 total shares authorized for grant under the plans.

The table below summarizes our stock-based compensation expense for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Stock-settled awards:
SARs	$	43	$	74	$	93	$	146
RSUs	2,078		1,714		3,974		3,307
Restricted stock	13		4		24		8
Cash-settled performance units	3,092		2,603		7,106		5,493
Total	$	5,226	$	4,395	$	11,197	$	8,954

(in thousands)	June 30, 2018
Unrecognized compensation expense related to unvested stock-settled awards	$	15,335
Weighted average period over which expense is expected to be recognized, in years	2.9

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INCOME TAXES (Notes)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Tax Cuts and Jobs Act (the "Tax Act") enacted in December 2017 reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result of the Tax Act, we re-measured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Tax Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded in 2017 related to the re-measurement of our deferred tax asset was $17.6 million, and no further adjustments were made during the six months ended June 30, 2018.

The reconciliation of our total effective income tax rate to the U.S. federal statutory tax rate for the six months ended June 30, 2018 and 2017 is as follows:

	Six months ended June 30,
	2018		2017
U.S. statutory rate	21	%	35	%
State taxes	1	%	1	%
Non-deductible expenses	1	%	—	%
Non-taxable income	(1	)%	(1	)%
Other	(1	)%	(1	)%
Effective tax rate	21	%	34	%

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FAIR VALUE DISCLOSURES

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

FAIR VALUE DISCLOSURES

FAIR VALUE DISCLOSURES

We determine the fair market values of our assets and liabilities measured at fair value on a recurring and nonrecurring basis using the fair value hierarchy as prescribed in ASC 820, Fair Value Measurements and Disclosures. The standard describes three levels of inputs that may be used to measure fair value as provided below.

Level 1 Quoted prices in active markets for identical assets or liabilities. This category includes the assets and liabilities related to our non-qualified deferred compensation plan where values are based on quoted market prices for identical equity securities in an active market.

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets include agency mortgage-backed debt securities and Community Reinvestment Act funds. This category also includes loans held for sale and derivative assets and liabilities where values are obtained from independent pricing services using observable market data.

Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair values requires significant management judgment or estimation. This category includes certain loans held for sale for which fair values are determined using third party pricing models. This category also includes impaired loans and OREO where collateral values have been based on third party appraisals; however, comparative sales data typically used in appraisals may be unavailable or more subjective in certain markets due to lack of market activity.

Assets and liabilities measured at fair value at June 30, 2018 and December 31, 2017 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2018	Level 1		Level 2		Level 3
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	8,785	$	—
Equity securities(1)(2)	8,711		6,912		—
Loans held for sale (3)	—		1,247,537		27,929
Loans held for investment(4)(6)	—		—		22,165
OREO(5)(6)	—		—		9,526
Derivative assets(7)	—		21,740		—
Derivative liabilities(7)	—		25,516		—
Non-qualified deferred compensation plan liabilities (8)	9,192		—		—
December 31, 2017
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	10,945	$	—
Equity securities(1)(2)	5,460		7,106		—
Loans held for sale(3)	—		1,007,695		—
Loans held for investment(4)(6)	—		—		21,216
OREO(5)(6)	—		—		11,742
Derivative assets(7)	—		16,719		—
Derivative liabilities(7)	—		17,377		—
Non-qualified deferred compensation plan liabilities (8)	5,587		—		—

(1) Securities are measured at fair value on a recurring basis, generally monthly.

(2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.

(3) Loans held for sale, excluding SBA loans which are carried at lower of cost or market, are measured at fair value on a recurring basis, generally monthly.

(4) Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

(5) OREO is transferred from loans to OREO at fair value less selling costs.

(6) Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.

(7) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.

(8) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.

Level 3 Valuations

Financial instruments are considered Level 3 when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 financial instruments include those for which the determination of fair value requires significant management judgment or estimation. Currently, we measure the fair value of certain loans held for sale using third party pricing models on a recurring basis, and measure certain collateral dependent impaired loans and OREO on a nonrecurring basis as described below.

Loans held for sale

The following table presents a reconciliation for the three and six months ended June 30, 2018 of loans held for sale measured at fair value on a recurring basis using Level 3 inputs (in thousands):

								Net Realized/Unrealized Gains (Losses)
								Recorded in Earnings(1)
	Balance at Beginning of Period		Purchases / Additions		Sales / Reductions			Realized			Unrealized		Balance at End of Period
Three months ended June 30, 2018
Loans held for sale	$	34,251	$	1,437	$	(7,988	)	$	161		$	68	$	27,929
Six months ended June 30, 2018
Loans held for sale	$	—	$	37,529	$	(7,988	)	$	(1,680	)	$	68	$	27,929

(1) Recorded in other non-interest income.

The fair value of loans held for sale using Level 3, or unobservable inputs, include loans that cannot be sold through normal sale channels and thus require significant management judgment or estimation when determining the fair value. The fair value of such loans is generally based upon quoted prices of comparable loans with a liquidity discount applied. At June 30, 2018, the fair value of these loans was calculated using a weighted-average discounted price of 94.3%.

Loans held for investment

At June 30, 2018 and December 31, 2017, certain impaired loans held for investment were reported at fair value through a specific allocation of the allowance for loan losses based upon the fair value of the underlying collateral. The $22.2 million fair value of loans held for investment at June 30, 2018 reported above includes impaired loans held for investment with a carrying value of $30.1 million that were reduced by specific allowance allocations totaling $7.9 million based on collateral valuations utilizing Level 3 valuation inputs. The $21.2 million fair value of loans held for investment at December 31, 2017 reported above includes impaired loans with a carrying value of $32.2 million that were reduced by specific valuation allowance allocations totaling $11.0 million based on collateral valuations utilizing Level 3 valuation inputs. Fair values were based on third party appraisals, which are Level 3 valuation inputs.

OREO

Certain foreclosed assets, upon initial recognition, are recorded at fair value less estimated selling costs. At June 30, 2018 and December 31, 2017, OREO had a carrying value of $11.5 million and $11.7 million, respectively, net of a $2.0 million specific valuation allowance at June 30, 2018 and no valuation allowance at December 31, 2017. The fair value of OREO was computed based on third party appraisals, which are Level 3 valuation inputs.

Fair Value of Financial Instruments

GAAP requires disclosure of fair value information about financial instruments, whether or not recognized on the balance sheet, for which it is practical to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. This disclosure does not and is not intended to represent the fair value of the Company.

A summary of the carrying amounts and estimated fair values of financial instruments is as follows (in thousands):

	June 30, 2018				December 31, 2017
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	3,462,794	$	3,462,794	$	2,905,591	$	2,905,591
Investment securities	8,711		8,711		5,460		5,460
Level 2 inputs:
Investment securities	15,697		15,697		18,051		18,051
Loans held for sale	1,248,839		1,248,839		1,011,004		1,011,004
Derivative assets	21,740		21,740		16,719		16,719
Level 3 inputs:
Loans held for sale	27,929		27,929		—		—
Loans held for investment, net	22,280,683		22,258,008		20,489,757		20,480,802
Financial liabilities:
Level 2 inputs:
Federal funds purchased	510,221		510,221		359,338		359,338
Customer repurchase agreements	10,628		10,628		5,702		5,702
Other borrowings	4,000,000		4,000,000		2,800,000		2,800,000
Subordinated notes	281,586		283,268		281,406		285,485
Derivative liabilities	25,516		25,516		17,377		17,377
Level 3 inputs:
Deposits	20,334,871		21,258,150		19,123,180		19,124,121
Trust preferred subordinated debentures	113,406		113,406		113,406		113,406

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

Investment Securities

Within the investment securities portfolio, we hold equity securities related to our non-qualified deferred compensation plan which are valued using quoted market prices for identical equity securities in an active market. These financial instruments are classified as Level 1 assets in the fair value hierarchy. The fair value of the remaining investment portfolio is based on prices obtained from independent pricing services which are based on quoted market prices for the same or similar securities, and these financial instruments are characterized as Level 2 assets in the fair value hierarchy. We have obtained documentation from our primary pricing service regarding their processes and controls applicable to pricing investment securities. In addition, on a quarterly basis we independently verify the prices that we receive from the service provider using two additional independent pricing sources. Any significant differences are investigated and resolved.

Loans Held for Sale

Fair value for loans held for sale is derived from quoted market prices for similar loans, in which case they are characterized as Level 2 assets in the fair value hierarchy, or is derived from third party pricing models, in which case they are characterized as Level 3 assets in the fair value hierarchy.

Derivatives

The estimated fair value of interest rate swaps and caps is obtained from independent pricing services based on quoted market prices for similar derivative contracts and these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. On a quarterly basis, we independently verify the fair value using an additional independent pricing source. Any significant differences are investigated and resolved. Foreign currency forward contracts are valued based upon quoted market prices obtained from independent pricing services for similar derivative contracts. As such, these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. The derivative instruments related to the loans held for sale portfolio include loan purchase commitments and forward sales commitments. Loan purchase commitments are valued based upon the fair value of the underlying mortgage loans to be purchased, which is based on observable market data for similar loans. Forward sales commitments are valued based upon quoted market prices from brokers. As such, these loan purchase commitments and forward sales commitments are characterized as Level 2 assets or liabilities in the fair value hierarchy.

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DERIVATIVE FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

DERIVATIVE FINANCIAL INSTRUMENTS

The fair value of derivative positions outstanding is included in accrued interest receivable and other assets and other liabilities in the accompanying consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement.

We enter into interest rate derivative positions that are not designated as hedging instruments. These derivative positions relate to transactions in which we enter into an interest rate swap, cap and/or floor with a customer while at the same time entering into an offsetting interest rate swap, cap and/or floor with another financial institution. In connection with each swap transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate. Because we act as an intermediary for our customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on our results of operations.

We also enter into foreign currency forward contracts that are not designated as hedging instruments. These derivative instruments relate to transactions in which we enter into a contract with a customer to buy or sell a foreign currency at a future date for a specified price while at the same time entering into an offsetting contract with a financial institution to buy or sell the same currency at the same future date for a specified price. These transactions allow our customers to manage their exposure to foreign currency exchange rate fluctuations. Because we act as an intermediary for our customer, changes in the fair value of the underlying derivative instruments substantially offset each other and do not have a material impact on our results of operations.

We also enter into loan purchase commitment contracts with mortgage originators to purchase residential mortgage loans at a future date, as well as forward sales commitment contracts to sell residential mortgage loans at a future date as part of our MCA program. The objective of these transactions is to mitigate our exposure to interest rate risk associated with the purchase of mortgage loans held for sale. Any changes in fair value are recorded in other non-interest expense in the consolidated statements of income and other comprehensive income.

The notional amounts and estimated fair values of interest rate derivative positions outstanding at June 30, 2018 and December 31, 2017 are presented in the following tables (in thousands):

	June 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount		Asset Derivative			Liability Derivative			Notional Amount		Asset Derivative			Liability Derivative
Non-hedging interest rate derivatives:
Financial institution counterparties:
Commercial loan/lease interest rate swaps	$	1,514,867	$	17,079		$	6,239		$	1,393,764	$	4,736		$	15,482
Commercial loan/lease interest rate caps	245,667		992			18			242,700		421			7
Foreign currency forward contracts	53,871		1,794			58			2,466		4			69
Customer counterparties:
Commercial loan/lease interest rate swaps	1,514,867		6,239			17,079			1,393,764		15,482			4,736
Commercial loan/lease interest rate caps	245,667		18			992			242,700		7			421
Foreign currency forward contracts	53,871		58			1,794			2,466		69			4
Economic hedging interest rate derivatives:
Loan purchase commitments	204,057		1,089			21			253,815		635			190
Forward sales commitments	1,361,500		—			4,844			1,086,224		—			1,103
Gross derivatives			27,269			31,045					21,354			22,012
Offsetting derivative assets/liabilities			(5,529		)	(5,529		)			(4,635		)	(4,635		)
Net derivatives included in the consolidated balance sheets			$	21,740		$	25,516				$	16,719		$	17,377

The weighted average received and paid interest rates for interest rate swaps outstanding at June 30, 2018 and December 31, 2017 were as follows:

	June 30, 2018 Weighted Average Interest Rate				December 31, 2017 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.85	%	4.17	%	3.59	%	4.34	%

The weighted average strike rate for outstanding interest rate caps was 2.38% at June 30, 2018 and 2.40% at December 31, 2017.

Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In some cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceeds a nominal amount. Our credit exposure associated with these instruments, net of any collateral pledged, was approximately $12.9 million at June 30, 2018 and approximately $16.7 million at December 31, 2017. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values, as well as for changes in the value of forward sales commitments. At June 30, 2018, we had pledged to counterparties $6.7 million in cash collateral for these derivatives, of which $2.8 million was included in interest-bearing deposits in other banks and $3.9 million was included in accrued interest receivable and other assets, and counterparties had pledged to us $11.1 million in cash collateral included in interest-bearing deposit liabilities. At December 31, 2017, we had pledged to counterparties $15.2 million in cash collateral for these derivatives, of which $14.0 million was included in interest-bearing deposits in other banks and $1.2 million was included in accrued interest receivable and other assets.

We also enter into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which we are either a participant or a lead bank. The risk participation agreements entered into by us as a participant bank provide credit protection to the financial institution counterparty should the borrower fail to perform on its interest rate derivative contract with that financial institution. We are party to 14 risk participation agreements where we are a participant bank having a notional amount of $130.2 million at June 30, 2018, compared to 15 risk participation agreements having a notional amount of $157.1 million at December 31, 2017. The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $157,000 at June 30, 2018 and $221,000 at December 31, 2017. The fair value of these exposures was insignificant to the consolidated financial statements at both June 30, 2018 and December 31, 2017. Risk participation agreements entered into by us as the lead bank provide credit protection to us should the borrower fail to perform on its interest rate derivative contract with us. We are party to 11 risk participation agreements where we are the lead bank having a notional amount of $126.5 million at June 30, 2018, compared to 10 agreements having a notional amount of $86.3 million at December 31, 2017.

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NEW ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS

ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326)" ("ASU 2016-13") requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") model to estimate its lifetime "expected credit loss" and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. ASU 2016-13 will be effective for us on January 1, 2020. We are evaluating the impact adoption of ASU 2016-13 will have on our consolidated financial statements and disclosures. While we are currently unable to reasonably estimate the impact of adopting ASU 2016-13, we expect that the impact of adoption could be significantly influenced by the composition, characteristics and quality of our loan portfolio as well as the prevailing economic conditions and forecasts as of the adoption date. As part of our evaluation process, we have established a steering committee and working group that includes individuals from various functional areas to assess processes, portfolio segmentation, systems requirements and needed resources to implement this new accounting standard.

ASU 2016-02 "Leases (Topic 842)" ("ASU 2016-02") requires that lessees and lessors recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. ASU 2016-02 will be effective for us on January 1, 2019. ASU 2016-02 provides for a modified retrospective transition approach requiring lessees to recognize and measure leases on the balance sheet at the beginning of the earliest period presented with the option to elect certain practical expedients. We are currently implementing a third party software solution to assist with the accounting under the new standard. Our operating leases relate primarily to office space and bank branches. We expect recorded assets and liabilities to increase upon adoption of the standard as it relates to operating leases in which we are the lessee.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Nature of Business

Organization and Nature of Business

Texas Capital Bancshares, Inc. (the “Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the “Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional and national clientèle of commercial borrowers. We are primarily a secured lender with a majority of our loans being made to businesses headquartered or with operations in Texas. At the same time, our national lines of business continue to provide specialized lending products to businesses throughout the United States.

Basis of Presentation

Basis of Presentation

Our accounting and reporting policies conform to accounting principles generally accepted in the United States (“GAAP”) and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation.

The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2017, included in our Annual Report on Form 10-K filed with the SEC on February 14, 2018 (the “2017 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.

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 disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of stock-based compensation awards, the fair value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

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EARNINGS PER COMMON SHARE (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

The following table presents the computation of basic and diluted earnings per share (in thousands except share data):

	Three months ended   June 30,				Six months ended   June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	71,436	$	51,095	$	143,381	$	93,637
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	68,999		48,658		$	138,506	88,762
Denominator:
Denominator for basic earnings per share—weighted average shares	49,736,384		49,576,837		49,695,783		49,556,393
Effect of employee stock-based awards(1)	348,762		224,306		336,285		244,058
Effect of warrants to purchase common stock	10,869		428,527		112,884		432,660
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,096,015		50,229,670		50,144,952		50,233,111
Basic earnings per common share	$	1.39	$	0.98	$	2.79	$	1.79
Diluted earnings per common share	$	1.38	$	0.97	$	2.76	$	1.77

(1) SARs and RSUs outstanding of 4,000 at June 30, 2018 and 6,200 at June 30, 2017 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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INVESTMENT SECURITIES (Tables)

6 Months Ended

Jun. 30, 2018

Available-for-sale Securities [Abstract]

Schedule of summary of securities

The following is a summary of available-for-sale debt securities (in thousands):

	June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	8,304	$	481	$	—	$	8,785
	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Residential mortgage-backed securities	$	10,297	$	648	$	—	$	10,945

Schedule of amortized cost and estimated fair value of securities

The amortized cost and estimated fair value of available-for-sale debt securities are presented below by contractual maturity (in thousands, except percentage data):

	June 30, 2018
	Less Than One Year		After One Through Five Years		After Five Through Ten Years		After Ten Years		Total
Residential mortgage-backed securities:(1)
Amortized cost	50		1,895		—		6,359		8,304
Estimated fair value	52		2,038		—		6,695		8,785
Weighted average yield(2)	5.24	%	5.55	%	—	%	3.75	%	4.17	%

	December 31, 2017
	Less Than One Year			After One Through Five Years			After Five Through Ten Years			After Ten Years			Total
Residential mortgage-backed securities:(1)
Amortized cost	$	409		$	819		$	1,502		$	7,567		$	10,297
Estimated fair value	418			916			1,636			7,975			10,945
Weighted average yield(2)	4.59		%	6.02		%	5.32		%	3.45		%	3.97		%

(1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

(2) Yields are calculated based on amortized cost.

Summary of unrealized and realized gains and losses recognized on equity securities

The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2018 (in thousands):

	Three months ended			Six months ended
	June 30, 2018			June 30, 2018
Net gains and (losses) recognized during the period on equity securities	$	108		$	(104	)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period	162			162
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date	$	(54	)	$	(266	)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Tables)

6 Months Ended

Jun. 30, 2018

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of loans held for investments

At June 30, 2018 and December 31, 2017, loans held for investment were as follows (in thousands):

	June 30, 2018			December 31, 2017
Commercial	$	10,189,832		$	9,189,811
Mortgage finance	5,923,058			5,308,160
Construction	2,226,590			2,166,208
Real estate	3,868,411			3,794,577
Consumer	46,652			48,684
Leases	314,575			264,903
Gross loans held for investment	22,569,118			20,772,343
Deferred income (net of direct origination costs)	(109,339		)	(97,931		)
Allowance for loan losses	(179,096		)	(184,655		)
Total loans held for investment, net	$	22,280,683		$	20,489,757

Schedule of the credit risk profile of loan portfolio by internally assigned grades and non-accrual status

The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	9,945,020	$	5,923,058	$	2,211,981	$	3,778,808	$	46,493	$	299,825	$	22,205,185
Special mention	87,297		—		14,609		56,003		—		—		157,909
Substandard-accruing	77,929		—		—		31,057		93		13,650		122,729
Non-accrual	79,586		—		—		2,543		66		1,100		83,295
Total loans held for investment	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	8,967,471	$	5,308,160	$	2,152,654	$	3,706,541	$	48,591	$	249,865	$	20,433,282
Special mention	19,958		—		13,554		53,652		—		495		87,659
Substandard-accruing	102,651		—		—		32,671		93		14,543		149,958
Non-accrual	99,731		—		—		1,713		—		—		101,444
Total loans held for investment	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343

Schedule of activity in the reserve for loan losses by portfolio segment

The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 2018 and 2017. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories.

June 30, 2018
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	118,806	$	—	$	19,273		$	34,287		$	357		$	3,542		$	8,390		$	184,655
Provision for loan losses	38,920		—		621			928			(205		)	860			(3,511		)	37,613
Charge-offs	43,972		—		—			—			—			—			—			43,972
Recoveries	680		—		—			32			68			20			—			800
Net charge-offs (recoveries)	43,292		—		—			(32		)	(68		)	(20		)	—			43,172
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
Period end amount allocated to:
Loans individually evaluated for impairment	$	11,772	$	—	$	—		$	73		$	11		$	495		$	—		$	12,351
Loans collectively evaluated for impairment	102,662		—		19,894			35,174			209			3,927			4,879			166,745
Ending balance	$	114,434	$	—	$	19,894		$	35,247		$	220		$	4,422		$	4,879		$	179,096
June 30, 2017
(in thousands)	Commercial		Mortgage Finance		Construction			Real Estate			Consumer			Leases			Additional Qualitative Reserve			Total
Beginning balance	$	128,768	$	—	$	13,144		$	19,149		$	241		$	1,124		$	5,700		$	168,126
Provision for loan losses	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225

Schedule of allowance for credit losses related to unfunded commitments

The table below presents the activity in the allowance for off-balance sheet credit losses related to unfunded commitments for the three and six months ended June 30, 2018 and 2017 (in thousands). This allowance is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
Beginning balance	$	9,623	$	10,847		$	9,071	$	11,422
Provision for off-balance sheet credit losses	835		(1,642		)	1,387		(2,217		)
Ending balance	$	10,458	$	9,205		$	10,458	$	9,205

Schedule of recorded investment in loans related to each balance in the allowance for loan losses

Our recorded investment in loans as of June 30, 2018, December 31, 2017 and June 30, 2017 related to each balance in the allowance for loan losses by portfolio segment and disaggregated on the basis of our impairment methodology was as follows (in thousands):

June 30, 2018
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	80,171	$	—	$	—	$	2,543	$	66	$	1,100	$	83,880
Loans collectively evaluated for impairment	10,109,661		5,923,058		2,226,590		3,865,868		46,586		313,475		22,485,238
Total	$	10,189,832	$	5,923,058	$	2,226,590	$	3,868,411	$	46,652	$	314,575	$	22,569,118
December 31, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	100,676	$	—	$	—	$	2,008	$	—	$	—	$	102,684
Loans collectively evaluated for impairment	9,089,135		5,308,160		2,166,208		3,792,569		48,684		264,903		20,669,659
Total	$	9,189,811	$	5,308,160	$	2,166,208	$	3,794,577	$	48,684	$	264,903	$	20,772,343
June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886

Schedule of impaired loans, by portfolio class

The following tables detail our impaired loans, by portfolio class, as of June 30, 2018 and December 31, 2017 (in thousands):

June 30, 2018
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	27,521	$	52,966	$	—	$	12,449	$	133
Energy	16,373		17,549		—		20,393		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,042		1,042		—		1,074		—
Secured by 1-4 family	1,263		1,263		—		211		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	46,199	$	72,820	$	—	$	34,127	$	133
With an allowance recorded:
Commercial
Business loans	$	19,038	$	19,038	$	5,597	$	43,537	$	—
Energy	17,239		18,500		6,175		32,145		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	—		—		—		166		—
Secured by 1-4 family	238		238		73		138		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans with an allowance recorded	$	37,681	$	38,947	$	12,351	$	76,314	$	—
Combined:
Commercial
Business loans	$	46,559	$	72,004	$	5,597	$	55,986	$	133
Energy	33,612		36,049		6,175		52,538		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		98		—
Commercial	1,042		1,042		—		1,240		—
Secured by 1-4 family	1,501		1,501		73		349		—
Consumer	66		71		11		47		—
Leases	1,100		1,100		495		183		—
Total impaired loans	$	83,880	$	111,767	$	12,351	$	110,441	$	133

December 31, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	16,835	$	18,257	$	—	$	22,964	$	—
Energy	21,426		22,602		—		36,579		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	1,096		1,096		—		2,166		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	39,357	$	41,955	$	—	$	61,709	$	—
With an allowance recorded:
Commercial
Business loans	$	18,645	$	19,020	$	2,544	$	16,960	$	—
Energy	43,770		55,875		21,772		50,867		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	499		499		75		166		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans with an allowance recorded	$	63,327	$	75,807	$	24,417	$	69,068	$	6
Combined:
Commercial
Business loans	$	35,480	$	37,277	$	2,544	$	39,924	$	—
Energy	65,196		78,477		21,772		87,446		6
Construction
Market risk	—		—		—		27		—
Real estate
Market risk	295		295		6		485		—
Commercial	1,595		1,595		75		2,332		—
Secured by 1-4 family	118		118		20		516		—
Consumer	—		—		—		33		—
Leases	—		—		—		14		—
Total impaired loans	$	102,684	$	117,762	$	24,417	$	130,777	$	6

Schedule of an age analysis of accruing past due loans

The table below provides an age analysis of our loans held for investment as of June 30, 2018 (in thousands):

	30-59 Days Past Due		60-89 Days Past Due		Greater Than 90 Days and Accruing(1)		Total Past Due		Non-accrual		Current		Total
Commercial
Business loans	$	14,114	$	17,188	$	6,203	$	37,505	$	45,974	$	8,750,741	$	8,834,220
Energy	24,900		—		—		24,900		33,612		1,297,100		1,355,612
Mortgage finance loans	—		—		—		—		—		5,923,058		5,923,058
Construction
Market risk	489		—		—		489		—		2,151,838		2,152,327
Commercial	—		—		—		—		—		41,991		41,991
Secured by 1-4 family	—		1,610		—		1,610		—		30,662		32,272
Real estate
Market risk	1,337		—		661		1,998		—		2,728,753		2,730,751
Commercial	639		—		—		639		1,042		814,188		815,869
Secured by 1-4 family	2,745		152		493		3,390		1,501		316,900		321,791
Consumer	2		—		—		2		66		46,584		46,652
Leases	—		—		—		—		1,100		313,475		314,575
Total loans held for investment	$	44,226	$	18,950	$	7,357	$	70,533	$	83,295	$	22,415,290	$	22,569,118

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.0 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.

Schedule of loans that have been restructured

The following table summarizes the loans that were restructured during the six months endedJune 30, 2018 and 2017 (in thousands):

As of and for the six months ended June 30, 2018
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,370	$	1,370
Total new restructured loans	1	$	1,370	$	1,370
As of and for the six months ended June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	599		672
Total new restructured loans	2	$	1,669	$	1,372

The following table provides information on how loans were modified as restructured during the six months ended June 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018		2017
Extended maturity	$	—	$	1,372
Adjusted payment schedule	1,370		—
Total	$	1,370	$	1,372

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Tables)

6 Months Ended

Jun. 30, 2018

Real Estate Owned, Disclosure of Detailed Components [Abstract]

Schedule of the activity related to OREO

The table below presents a summary of the activity related to OREO (in thousands):

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Beginning balance	$	9,558		$	18,833		$	11,742		$	18,961
Additions	—			—			—			—
Sales	(32		)	(144		)	(216		)	(272		)
Valuation allowance for OREO	—			—			(2,000		)	—
Ending balance	$	9,526		$	18,689		$	9,526		$	18,689

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Tables)

6 Months Ended

Jun. 30, 2018

Transfers and Servicing [Abstract]

Schedule of Loans Held for Sale

The table below presents the unpaid principal balance of loans held for sale and related fair values at June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018		December 31, 2017
Outstanding balance(1)	$	1,273,889	$	1,009,271
Fair value(1)	1,275,466		1,007,695
Fair value over/(under) outstanding balance	$	1,577	$	(1,576	)

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2018 and 2017 (in thousands):

	Six months ended June 30,
	2018			2017
Beginning balance(1)	$	1,011,004		$	968,929
Loans purchased	3,205,483			2,843,690
Payments and loans sold(1)	(2,942,872		)	(2,976,523		)
Change in fair value	3,153			9,921
Ending balance	$	1,276,768		$	846,017

(1) Includes $1.3 million and $3.3 million of SBA loans held for sale carried at lower of cost or market at June 30, 2018 and December 31, 2017.

Servicing Asset at Amortized Cost

We generally retain the right to service the loans sold, creating MSRs which are recorded as assets on our balance sheet. A summary of MSR activity for the six months endedJune 30, 2018 and 2017 is as follows (in thousands):

	Six months ended June 30,
	2018			2017
MSRs:
Balance, beginning of year	$	88,150		$	28,536
Capitalized servicing rights	26,656			37,343
Amortization	(5,288		)	(2,856		)
Sales	(26,742		)	—
Balance, end of period	$	82,776		$	63,023
Valuation allowance:
Balance, beginning of year	$	2,823		$	—
Increase (decrease) in valuation allowance	(2,823		)	—
Balance, end of period	$	—		$	—
MSRs, net(1)	$	82,776		$	63,023
MSRs, fair value	$	90,179		$	64,889

(1) MSRs are reported on the consolidated balance sheets at amortized cost

Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities

As of June 30, 2018 and December 31, 2017, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2018		December 31, 2017
Average discount rates	9.61	%	9.90	%
Expected prepayment speeds	9.04	%	9.99	%
Weighted average life, in years	7.5		7.0

Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets

A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table (in thousands):

	June 30, 2018			December 31, 2017
50 bp adverse change in prepayment speed	$	(12,184	)	$	(11,896	)
100 bp adverse change in prepayment speed	(24,683		)	(28,226		)

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Tables)

6 Months Ended

Jun. 30, 2018

Risks and Uncertainties [Abstract]

Schedule of financial instruments with off-balance sheet risk

The table below summarizes our off-balance sheet financial instruments whose contract amounts represented credit risk (in thousands):

	June 30, 2018		December 31, 2017
Commitments to extend credit	$	7,254,475	$	6,957,847
Standby letters of credit	244,962		230,958

At June 30, 2018 and December 31, 2017, we had $10.5 million and $9.1 million, respectively, in allowance for off-balance sheet credit losses related to these off-balance sheet commitments recorded in other liabilities in the consolidated balance sheets.

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REGULATORY MATTERS (Tables)

6 Months Ended

Jun. 30, 2018

Regulatory Capital Requirements [Abstract]

Schedule of capital ratios

The table below summarizes our actual and required capital ratios under the Basel III Capital Rules:

	Actual				Minimum Capital Required - Basel III Phase-In Schedule				Minimum capital Required - Basel III Fully Phased-In				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount	Ratio
As of June 30, 2018:
CET1
Company	$	2,173,815	8.32	%	$	1,665,009	6.38	%	$	1,828,245	7.00	%	N/A	N/A
Bank	2,178,607		8.35	%	1,662,918		6.38	%	1,825,950		7.00	%	1,695,525	6.50	%
Total capital (to risk-weighted assets)
Company	2,902,789		11.11	%	2,579,132		9.88	%	2,742,368		10.50	%	N/A	N/A
Bank	2,749,018		10.54	%	2,575,893		9.88	%	2,738,925		10.50	%	2,608,500	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,431,650		9.31	%	2,056,776		7.88	%	2,220,012		8.50	%	N/A	N/A
Bank	2,336,442		8.96	%	2,054,193		7.88	%	2,217,225		8.50	%	2,086,800	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,431,650		9.89	%	983,476		4.00	%	983,476		4.00	%	N/A	N/A
Bank	2,336,442		9.51	%	982,989		4.00	%	982,989		4.00	%	1,228,736	5.00	%
As of December 31, 2017:
CET1
Company	$	2,033,830	8.45	%	$	1,384,448	5.75	%	$	1,685,464	7.00	%	N/A	N/A
Bank	1,992,152		8.28	%	1,383,475		5.75	%	1,684,231		7.00	%	1,563,929	6.50	%
Total capital (to risk-weighted assets)
Company	2,768,153		11.50	%	2,227,221		9.25	%	2,528,196		10.50	%	N/A	N/A
Bank	2,567,961		10.67	%	2,225,591		9.25	%	2,526,347		10.50	%	2,406,044	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,293,016		9.52	%	1,745,659		7.25	%	2,046,635		8.50	%	N/A	N/A
Bank	2,151,338		8.94	%	1,744,382		7.25	%	2,045,138		8.50	%	1,924,835	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,293,016		9.15	%	1,002,494		4.00	%	1,002,494		4.00	%	N/A	N/A
Bank	2,151,338		8.59	%	1,002,144		4.00	%	1,002,144		4.00	%	1,252,680	5.00	%

(1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, it should be noted that the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum.

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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2018

Compensation Related Costs [Abstract]

Schedule of stock-based compensation costs

tock-based compensation expense for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Stock-settled awards:
SARs	$	43	$	74	$	93	$	146
RSUs	2,078		1,714		3,974		3,307
Restricted stock	13		4		24		8
Cash-settled performance units	3,092		2,603		7,106		5,493
Total	$	5,226	$	4,395	$	11,197	$	8,954

Schedule of unrecognized compensation costs

(in thousands)	June 30, 2018
Unrecognized compensation expense related to unvested stock-settled awards	$	15,335
Weighted average period over which expense is expected to be recognized, in years	2.9

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INCOME TAXES (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of our total effective income tax rate to the U.S. federal statutory tax rate for the six months ended June 30, 2018 and 2017 is as follows:

	Six months ended June 30,
	2018		2017
U.S. statutory rate	21	%	35	%
State taxes	1	%	1	%
Non-deductible expenses	1	%	—	%
Non-taxable income	(1	)%	(1	)%
Other	(1	)%	(1	)%
Effective tax rate	21	%	34	%

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FAIR VALUE DISCLOSURES (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value

Assets and liabilities measured at fair value at June 30, 2018 and December 31, 2017 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2018	Level 1		Level 2		Level 3
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	8,785	$	—
Equity securities(1)(2)	8,711		6,912		—
Loans held for sale (3)	—		1,247,537		27,929
Loans held for investment(4)(6)	—		—		22,165
OREO(5)(6)	—		—		9,526
Derivative assets(7)	—		21,740		—
Derivative liabilities(7)	—		25,516		—
Non-qualified deferred compensation plan liabilities (8)	9,192		—		—
December 31, 2017
Available-for-sale debt securities:(1)
Residential mortgage-backed securities	$	—	$	10,945	$	—
Equity securities(1)(2)	5,460		7,106		—
Loans held for sale(3)	—		1,007,695		—
Loans held for investment(4)(6)	—		—		21,216
OREO(5)(6)	—		—		11,742
Derivative assets(7)	—		16,719		—
Derivative liabilities(7)	—		17,377		—
Non-qualified deferred compensation plan liabilities (8)	5,587		—		—

(1) Securities are measured at fair value on a recurring basis, generally monthly.

(2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.

(3) Loans held for sale, excluding SBA loans which are carried at lower of cost or market, are measured at fair value on a recurring basis, generally monthly.

(4) Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

(5) OREO is transferred from loans to OREO at fair value less selling costs.

(6) Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.

(7) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.

(8) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.

Summary of the carrying amounts and estimated fair values of financial instruments

A summary of the carrying amounts and estimated fair values of financial instruments is as follows (in thousands):

	June 30, 2018				December 31, 2017
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	3,462,794	$	3,462,794	$	2,905,591	$	2,905,591
Investment securities	8,711		8,711		5,460		5,460
Level 2 inputs:
Investment securities	15,697		15,697		18,051		18,051
Loans held for sale	1,248,839		1,248,839		1,011,004		1,011,004
Derivative assets	21,740		21,740		16,719		16,719
Level 3 inputs:
Loans held for sale	27,929		27,929		—		—
Loans held for investment, net	22,280,683		22,258,008		20,489,757		20,480,802
Financial liabilities:
Level 2 inputs:
Federal funds purchased	510,221		510,221		359,338		359,338
Customer repurchase agreements	10,628		10,628		5,702		5,702
Other borrowings	4,000,000		4,000,000		2,800,000		2,800,000
Subordinated notes	281,586		283,268		281,406		285,485
Derivative liabilities	25,516		25,516		17,377		17,377
Level 3 inputs:
Deposits	20,334,871		21,258,150		19,123,180		19,124,121
Trust preferred subordinated debentures	113,406		113,406		113,406		113,406

Reconciliation of loans held for sale

The following table presents a reconciliation for the three and six months ended June 30, 2018 of loans held for sale measured at fair value on a recurring basis using Level 3 inputs (in thousands):

								Net Realized/Unrealized Gains (Losses)
								Recorded in Earnings(1)
	Balance at Beginning of Period		Purchases / Additions		Sales / Reductions			Realized			Unrealized		Balance at End of Period
Three months ended June 30, 2018
Loans held for sale	$	34,251	$	1,437	$	(7,988	)	$	161		$	68	$	27,929
Six months ended June 30, 2018
Loans held for sale	$	—	$	37,529	$	(7,988	)	$	(1,680	)	$	68	$	27,929

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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional amounts and estimated fair values of interest rate derivative positions

The notional amounts and estimated fair values of interest rate derivative positions outstanding at June 30, 2018 and December 31, 2017 are presented in the following tables (in thousands):

	June 30, 2018								December 31, 2017
	Estimated Fair Value								Estimated Fair Value
	Notional Amount		Asset Derivative			Liability Derivative			Notional Amount		Asset Derivative			Liability Derivative
Non-hedging interest rate derivatives:
Financial institution counterparties:
Commercial loan/lease interest rate swaps	$	1,514,867	$	17,079		$	6,239		$	1,393,764	$	4,736		$	15,482
Commercial loan/lease interest rate caps	245,667		992			18			242,700		421			7
Foreign currency forward contracts	53,871		1,794			58			2,466		4			69
Customer counterparties:
Commercial loan/lease interest rate swaps	1,514,867		6,239			17,079			1,393,764		15,482			4,736
Commercial loan/lease interest rate caps	245,667		18			992			242,700		7			421
Foreign currency forward contracts	53,871		58			1,794			2,466		69			4
Economic hedging interest rate derivatives:
Loan purchase commitments	204,057		1,089			21			253,815		635			190
Forward sales commitments	1,361,500		—			4,844			1,086,224		—			1,103
Gross derivatives			27,269			31,045					21,354			22,012
Offsetting derivative assets/liabilities			(5,529		)	(5,529		)			(4,635		)	(4,635		)
Net derivatives included in the consolidated balance sheets			$	21,740		$	25,516				$	16,719		$	17,377

Schedule of the weighted-average receive and pay interest rate swaps

The weighted average received and paid interest rates for interest rate swaps outstanding at June 30, 2018 and December 31, 2017 were as follows:

	June 30, 2018 Weighted Average Interest Rate				December 31, 2017 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.85	%	4.17	%	3.59	%	4.34	%

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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income		$ 71,436	$ 51,095	$ 143,381	$ 93,637
Preferred stock dividends		2,437	2,437	4,875	4,875
Net income available to common stockholders		$ 68,999	$ 48,658	$ 138,506	$ 88,762
Denominator:
Denominator for basic earnings per share—weighted average shares		49,736,384	49,576,837	49,695,783	49,556,393
Effect of employee stock-based awards	[1]	348,762	224,306	336,285	244,058
Effect of warrants to purchase common stock		10,869	428,527	112,884	432,660
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions		50,096,015	50,229,670	50,144,952	50,233,111
Basic earnings per common share (usd per share)		$ 1.39	$ 0.98	$ 2.79	$ 1.79
Diluted earnings per common share (usd per share)		$ 1.38	$ 0.97	$ 2.76	$ 1.77
Stock options, SARs and RSUs excluded from computation of diluted EPS				4,000	6,200

[1] SARs and RSUs outstanding of 4,000 at June 30, 2018 and 6,200 at June 30, 2017 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Summary of Available-for-Sale Securities
Estimated Fair Value		$ 24,408	$ 23,511
Residential mortgage-backed securities
Summary of Available-for-Sale Securities
Amortized Cost	[1]	8,304	10,297
Gross Unrealized Gains		481	648
Gross Unrealized Losses		0	0
Estimated Fair Value	[1]	$ 8,785	$ 10,945

[1] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

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INVESTMENT SECURITIES (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Jun. 30, 2018
The amortized cost and fair value of available-for-sale securites by maturity
Estimated Fair Value		$ 12,600	$ 15,600
Residential mortgage-backed securities
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year	[1]	409	50
Amortized cost, After One Through Five Years	[1]	819	1,895
Amortized cost, After Five Through Ten Years	[1]	1,502	0
Amortized cost, After Ten Years	[1]	7,567	6,359
Amortized Cost	[1]	10,297	8,304
Estimated fair value, Less Than One Year	[1]	418	52
Estimated fair value, After One Through Five Years	[1]	916	2,038
Estimated fair value, After Five Through Ten Years	[1]	1,636	0
Estimated fair value, After Ten Years	[1]	$ 7,975	$ 6,695
Weighted average yield, Less Than One Year	[1]	4.59%	5.24%
Weighted average yield, After One Through Five Years	[1]	6.02%	5.55%
Weighted average yield, After Five Through Ten Years	[1]	5.32%	0.00%
Weighted average yield, After Ten Years	[1]	3.45%	3.75%
Weighted average yield, Total	[1]	3.97%	4.17%
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral			$ 2,000
Repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral			$ 5,800
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Available-for-sale Securities, Other Disclosure Items
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent		$ 10

[1] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

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INVESTMENT SECURITIES (Details 3) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Available-for-sale Securities [Abstract]
Realized Investment Gains (Losses)	$ 108	$ (104)
Gain (Loss) on Sale of Equity Investments	162	162
Unrealized Gain (Loss) on Investments	$ (54)	$ (266)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans and Leases Receivable, Net Reported Amount
Commercial	$ 10,189,832	$ 9,189,811
Mortgage finance	5,923,058	5,308,160
Construction	2,226,590	2,166,208
Real estate	3,868,411	3,794,577
Consumer	46,652	48,684
Leases	314,575	264,903
Gross loans held for investment	22,569,118	20,772,343	$ 19,560,886
Deferred income (net of direct origination costs)	(109,339)	(97,931)
Allowance for loan losses	(179,096)	(184,655)	$ (174,225)	$ (168,126)
Loans held for investment, net	22,280,683	20,489,757
Participating mortgage finance loans	$ 242,700	$ 171,200

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LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Risk Profile (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 10,189,832	$ 9,189,811
Mortgage finance	5,923,058	5,308,160
Construction	2,226,590	2,166,208
Real estate	3,868,411	3,794,577
Consumer	46,652	48,684
Leases	314,575	264,903
Gross loans held for investment	22,569,118	20,772,343	$ 19,560,886
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	9,945,020	8,967,471
Mortgage finance	5,923,058	5,308,160
Construction	2,211,981	2,152,654
Real estate	3,778,808	3,706,541
Consumer	46,493	48,591
Leases	299,825	249,865
Gross loans held for investment	22,205,185	20,433,282
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	87,297	19,958
Mortgage finance	0	0
Construction	14,609	13,554
Real estate	56,003	53,652
Consumer	0	0
Leases	0	495
Gross loans held for investment	157,909	87,659
Substandard-accruing
Financing Receivable, Recorded Investment [Line Items]
Commercial	77,929	102,651
Mortgage finance	0	0
Construction	0	0
Real estate	31,057	32,671
Consumer	93	93
Leases	13,650	14,543
Gross loans held for investment	122,729	149,958
Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Commercial	79,586	99,731
Mortgage finance	0	0
Construction	0	0
Real estate	2,543	1,713
Consumer	66	0
Leases	1,100	0
Gross loans held for investment	$ 83,295	$ 101,444

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable Modifications Non Accrual Loans Met Criteria For Restrucutred			$ 9,000	$ 18,800
Reserve for loan losses:
Beginning balance	$ 184,655	$ 168,126
Provision for loan losses	37,613	24,217
Charge-offs	43,972	21,763
Recoveries	800	3,645
Net charge-offs (recoveries)	43,172	18,118
Period end amount allocated to:
Loans individually evaluated for impairment			12,351		$ 28,562
Loans collectively evaluated for impairment			166,745		145,663
Ending balance	184,655	168,126	179,096	184,655	174,225
Commercial
Reserve for loan losses:
Beginning balance	118,806	128,768
Provision for loan losses	38,920	19,384
Charge-offs	43,972	21,543
Recoveries	680	3,442
Net charge-offs (recoveries)	43,292	18,101
Period end amount allocated to:
Loans individually evaluated for impairment			11,772		28,382
Loans collectively evaluated for impairment			102,662		101,669
Ending balance	118,806	128,768	114,434	118,806	130,051
Mortgage finance loans
Reserve for loan losses:
Beginning balance	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Period end amount allocated to:
Loans individually evaluated for impairment			0		0
Loans collectively evaluated for impairment			0		0
Ending balance	0	0	0	0	0
Construction
Reserve for loan losses:
Beginning balance	19,273	13,144
Provision for loan losses	621	680
Charge-offs	0	0
Recoveries	0	101
Net charge-offs (recoveries)	0	(101)
Period end amount allocated to:
Loans individually evaluated for impairment			0		0
Loans collectively evaluated for impairment			19,894		13,925
Ending balance	19,273	13,144	19,894	19,273	13,925
Real Estate
Reserve for loan losses:
Beginning balance	34,287	19,149
Provision for loan losses	928	3,436
Charge-offs	0	40
Recoveries	32	53
Net charge-offs (recoveries)	(32)	(13)
Period end amount allocated to:
Loans individually evaluated for impairment			73		180
Loans collectively evaluated for impairment			35,174		22,418
Ending balance	34,287	19,149	35,247	34,287	22,598
Consumer
Reserve for loan losses:
Beginning balance	357	241
Provision for loan losses	(205)	287
Charge-offs	0	180
Recoveries	68	41
Net charge-offs (recoveries)	(68)	139
Period end amount allocated to:
Loans individually evaluated for impairment			11		0
Loans collectively evaluated for impairment			209		389
Ending balance	357	241	220	357	389
Leases
Reserve for loan losses:
Beginning balance	3,542	1,124
Provision for loan losses	860	2,989
Charge-offs	0	0
Recoveries	20	8
Net charge-offs (recoveries)	(20)	(8)
Period end amount allocated to:
Loans individually evaluated for impairment			495		0
Loans collectively evaluated for impairment			3,927		4,121
Ending balance	3,542	1,124	4,422	3,542	4,121
Unallocated
Reserve for loan losses:
Beginning balance	8,390	5,700
Provision for loan losses	(3,511)	(2,559)
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Period end amount allocated to:
Loans individually evaluated for impairment			0		0
Loans collectively evaluated for impairment			4,879		3,141
Ending balance	$ 8,390	$ 5,700	$ 4,879	$ 8,390	$ 3,141

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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Credit Losses Related to Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for off-balance sheet credit losses	$ 27,000	$ 13,000	$ 39,000	$ 22,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	9,623	10,847	9,071	11,422
Provision for off-balance sheet credit losses	835	(1,642)	1,387	(2,217)
Ending balance	$ 10,458	$ 9,205	$ 10,458	$ 9,205

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	$ 83,880	$ 102,684	$ 125,284
Loans collectively evaluated for impairment	22,485,238	20,669,659	19,435,602
Gross loans held for investment	22,569,118	20,772,343	19,560,886
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	80,171	100,676	120,770
Loans collectively evaluated for impairment	10,109,661	9,089,135	8,130,182
Gross loans held for investment	10,189,832	9,189,811	8,250,952
Mortgage finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	0	0
Loans collectively evaluated for impairment	5,923,058	5,308,160	5,183,600
Gross loans held for investment	5,923,058	5,308,160	5,183,600
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	0	0
Loans collectively evaluated for impairment	2,226,590	2,166,208	2,242,562
Gross loans held for investment	2,226,590	2,166,208	2,242,562
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	2,543	2,008	4,514
Loans collectively evaluated for impairment	3,865,868	3,792,569	3,565,273
Gross loans held for investment	3,868,411	3,794,577	3,569,787
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	66	0	0
Loans collectively evaluated for impairment	46,586	48,684	39,122
Gross loans held for investment	46,652	48,684	39,122
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	1,100	0	0
Loans collectively evaluated for impairment	313,475	264,903	274,863
Gross loans held for investment	$ 314,575	$ 264,903	$ 274,863

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) $ in Millions	Jun. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Non-accrual loans earning on a cash basis	$ 0.0

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment			$ 21,426
With no related allowance recorded:
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 46,199		39,357
Unpaid principal balance	72,820		41,955
Related allowance	0		0
Average recorded investment	34,127		61,709
Interest income recognized	133		0
With no related allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	27,521		16,835
Unpaid principal balance	52,966		18,257
Related allowance	0		0
Average recorded investment	12,449		22,964
Interest income recognized	133		0
With no related allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	16,373
Unpaid principal balance	17,549		22,602
Related allowance	0		0
Average recorded investment	20,393		36,579
Interest income recognized	0		0
With no related allowance recorded: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	1,042		1,096
Unpaid principal balance	1,042		1,096
Related allowance	0		0
Average recorded investment	1,074		2,166
Interest income recognized	0		0
With no related allowance recorded: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	1,263		0
Unpaid principal balance	1,263		0
Related allowance	0		0
Average recorded investment	211		0
Interest income recognized	0		0
With no related allowance recorded: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With an allowance recorded:
Financing Receivable, Impaired [Line Items]
Recorded investment	37,681		63,327
Unpaid principal balance	38,947		75,807
Related allowance	12,351		24,417
Average recorded investment	76,314		69,068
Interest income recognized	0		6
With an allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	19,038		18,645
Unpaid principal balance	19,038		19,020
Related allowance	5,597		2,544
Average recorded investment	43,537		16,960
Interest income recognized	0		0
With an allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	17,239		43,770
Unpaid principal balance	18,500		55,875
Related allowance	6,175		21,772
Average recorded investment	32,145		50,867
Interest income recognized	0		6
With an allowance recorded: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		27
Interest income recognized	0		0
With an allowance recorded: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		295
Unpaid principal balance	0		295
Related allowance	0		6
Average recorded investment	98		485
Interest income recognized	0		0
With an allowance recorded: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	0		499
Unpaid principal balance	0		499
Related allowance	0		75
Average recorded investment	166		166
Interest income recognized	0		0
With an allowance recorded: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	238		118
Unpaid principal balance	238		118
Related allowance	73		20
Average recorded investment	138		516
Interest income recognized	0		0
With an allowance recorded: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	66		0
Unpaid principal balance	71		0
Related allowance	11		0
Average recorded investment	47		33
Interest income recognized	0		0
With an allowance recorded: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	1,100		0
Unpaid principal balance	1,100		0
Related allowance	495		0
Average recorded investment	183		14
Interest income recognized	0		0
Combined:
Financing Receivable, Impaired [Line Items]
Recorded investment	83,880		102,684
Unpaid principal balance	111,767		117,762
Related allowance	12,351		24,417
Average recorded investment	110,441	$ 149,500	130,777
Interest income recognized	133		6
Combined: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	46,559		35,480
Unpaid principal balance	72,004		37,277
Related allowance	5,597		2,544
Average recorded investment	55,986		39,924
Interest income recognized	133		0
Combined: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	33,612		65,196
Unpaid principal balance	36,049		78,477
Related allowance	6,175		21,772
Average recorded investment	52,538		87,446
Interest income recognized	0		6
Combined: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		27
Interest income recognized	0		0
Combined: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		295
Unpaid principal balance	0		295
Related allowance	0		6
Average recorded investment	98		485
Interest income recognized	0		0
Combined: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	1,042		1,595
Unpaid principal balance	1,042		1,595
Related allowance	0		75
Average recorded investment	1,240		2,332
Interest income recognized	0		0
Combined: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	1,501		118
Unpaid principal balance	1,501		118
Related allowance	73		20
Average recorded investment	349		516
Interest income recognized	0		0
Combined: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	66		0
Unpaid principal balance	71		0
Related allowance	11		0
Average recorded investment	47		33
Interest income recognized	0		0
Combined: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	1,100		0
Unpaid principal balance	1,100		0
Related allowance	495		0
Average recorded investment	183		14
Interest income recognized	$ 0		$ 0

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) $ in Thousands	Jun. 30, 2018 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 70,533
Non-accrual	83,295
Current	22,415,290
Total	22,569,118
Premium finance loans past due 90 days and still accruing	6,000
Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	37,505
Non-accrual	45,974
Current	8,750,741
Total	8,834,220
Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	24,900
Non-accrual	33,612
Current	1,297,100
Total	1,355,612
Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	5,923,058
Total	5,923,058
Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	489
Non-accrual	0
Current	2,151,838
Total	2,152,327
Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	41,991
Total	41,991
Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,610
Non-accrual	0
Current	30,662
Total	32,272
Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,998
Non-accrual	0
Current	2,728,753
Total	2,730,751
Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	639
Non-accrual	1,042
Current	814,188
Total	815,869
Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,390
Non-accrual	1,501
Current	316,900
Total	321,791
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2
Non-accrual	66
Current	46,584
Total	46,652
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	1,100
Current	313,475
Total	314,575
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	44,226
30-59 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	14,114
30-59 Days Past Due | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	24,900
30-59 Days Past Due | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	489
30-59 Days Past Due | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,337
30-59 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	639
30-59 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,745
30-59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2
30-59 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	18,950
60-89 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	17,188
60-89 Days Past Due | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,610
60-89 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	152
60-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Greater Than 90 Days and Accruing(1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,357	[1]
Greater Than 90 Days and Accruing(1) | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,203	[1]
Greater Than 90 Days and Accruing(1) | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	661	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	493	[1]
Greater Than 90 Days and Accruing(1) | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 0	[1]

[1] Loans past due 90 days and still accruing includes premium finance loans of $6.0 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 7) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Number of restructured loans	1	2
Pre-restructuring outstanding recorded investment	$ 1,370	$ 1,669
Post-restructuring outstanding recorded investment	$ 1,370	$ 1,372
Energy loans
Financing Receivable, Modifications [Line Items]
Number of restructured loans	1	1
Pre-restructuring outstanding recorded investment	$ 1,370	$ 1,070
Post-restructuring outstanding recorded investment	$ 1,370	$ 700
Commercial business loans
Financing Receivable, Modifications [Line Items]
Number of restructured loans		1
Pre-restructuring outstanding recorded investment		$ 599
Post-restructuring outstanding recorded investment		$ 672

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LOANS AND ALLOWANCE FOR LOAN LOSSES - TDR Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	$ 1,370	$ 1,372
Extended maturity
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	0	1,372
Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	$ 1,370	$ 0

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 9,558	$ 18,833	$ 11,742	$ 18,961
Additions	0	0	0	0
Sales	(32)	(144)	(216)	(272)
Valuation allowance for OREO	0	0	2,000	0
Ending balance	$ 9,526	$ 18,689	$ 9,526	$ 18,689

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Fair value over/(under) outstanding balance	$ 1,577,000		$ (1,576,000)
Outstanding principal balance of loans in servicing portfolio Financial Assets, Principal Amount Outstanding	7,100,000,000		7,000,000,000
Escrow fund deposits related to servicing assets	84,500,000		73,400,000
Estimated exposure related to servicing assets	1,500,000	$ 1,300,000
Loss Contingency Accrual, Payments	148,000
Losses due to repurchase, indemnification or make-whole obligations		$ 7,000
Total past due	70,533,000
Loans held for sale, at fair value	1,276,768,000		1,011,004,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Maturity Greater than 90 Days [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total past due	27,900,000		19,700,000
Government Guaranteed Mortgage Loans upon Foreclosure Receivable [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Maturity Greater than 90 Days [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total past due	3,100,000		19,000,000
Loans held for sale, at fair value	24,100,000
Small Business Administration Loans [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Loans and Leases Receivable Disclosure [Line Items]
Fair value over/(under) outstanding balance	$ 1,300,000		$ 3,300,000

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
Unpaid principal balance	$ 1,273,889	$ 1,009,271
Fair value	1,275,466	1,007,695
Fair value over/(under) outstanding balance	$ 1,577	(1,576)
Loans held for sale carried at lower of cost or market		$ 0

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Transfers and Servicing [Abstract]
Gain (Loss) on Sale of Notes Receivable	$ 7,400	$ 100
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Beginning balance(1)	1,011,004	968,929
Loans purchased	3,205,483	2,843,690
Payments and loans sold(1)(2)	(2,942,872)	(2,976,523)
Change in fair value	3,153	9,921
Ending balance	$ 1,276,768	$ 846,017
Loans held for sale carried at lower of cost or market			$ 0

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Valuation allowance:
MSRs, net(1)	$ 82,776	$ 63,023
MSR
MSRs:
Balance, beginning of year	88,150	28,536
Capitalized servicing rights	26,656	37,343
Amortization	(5,288)	(2,856)
Sales	(26,742)	0
Balance, end of period	82,776	63,023
Valuation allowance:
Balance, beginning of year	2,823	0
Increase (decrease) in valuation allowance	(2,823)	0
Balance, end of period	0	0
MSRs, net(1)	$ 90,179	$ 64,889

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 4) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Impairment charges		$ 0	$ 5,285
Average discount rates (percent)		9.61%		9.90%
Expected prepayment speeds (percent)		9.04%		9.99%
Weighted average life, in years		7 years 6 months		7 years
Servicing Asset [Member]
Servicing Assets at Fair Value [Line Items]
Impairment charges	$ 2,800

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 5) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
50 bp adverse change in prepayment speed	$ (12,184)	$ (11,896)
100 bp adverse change in prepayment speed	$ (24,683)	$ (28,226)

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financing receivable allowance for credit losses off balance sheet liability	$ 10,500	$ 9,100
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments whose contract amounts represented credit risk	7,254,475	6,957,847
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments whose contract amounts represented credit risk	$ 244,962	$ 230,958

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REGULATORY MATTERS (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 27,781,910		$ 25,075,645	$ 15,000,000
Common Equity Tier 1 Capital	$ 2,173,815		$ 2,033,830
Tier 1 capital	9.31%		9.52%
Total capital	11.11%		11.50%
Tier 1 leverage	9.89%		9.15%
Mortgage finance	$ 5,923,058		$ 5,308,160
Mortgage finance, average balance	$ 4,900,000
Common Equity Tier 1, Capital to Risk Weighted Assets	8.32%		8.45%
Capital	$ 2,902,789		$ 2,768,153
Tier One Risk Based Capital	2,431,650		2,293,016
Tier One Leverage Capital	$ 2,431,650		2,293,016
Common Stock, Dividends, Per Share, Declared	$ 0	$ 0
Common Stock, Dividends, Per Share, Cash Paid	$ 0	$ 0
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital	$ 2,178,607		$ 1,992,152
Tier 1 capital	8.96%		8.94%
Total capital	10.54%		10.67%
Tier 1 leverage	9.51%		8.59%
Common Equity Tier 1, Capital to Risk Weighted Assets	8.35%		8.28%
Common Equity Tier 1, Capital Required to be Well Capitalized	$ 1,695,525		$ 1,563,929
Common Equity Tier 1, Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%		6.50%
Capital	$ 2,749,018		$ 2,567,961
Capital Required to be Well Capitalized	$ 2,608,500		$ 2,406,044
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%		10.00%
Tier One Risk Based Capital	$ 2,336,442		$ 2,151,338
Tier One Risk Based Capital Required to be Well Capitalized	$ 2,086,800		$ 1,924,835
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%		8.00%
Tier One Leverage Capital	$ 2,336,442		$ 2,151,338
Tier One Leverage Capital Required to be Well Capitalized	$ 1,228,736		$ 1,252,680
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%		5.00%
Advanced Approach, Phase-In Schedule [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,665,009		$ 1,384,448
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	6.375%		5.75%
Capital Required for Capital Adequacy	$ 2,579,132		$ 2,227,221
Capital Required for Capital Adequacy to Risk Weighted Assets	9.875%		9.25%
Tier One Risk Based Capital Required for Capital Adequacy	$ 2,056,776		$ 1,745,659
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.875%		7.25%
Tier One Leverage Capital Required for Capital Adequacy	$ 983,476		$ 1,002,494
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phase-In Schedule [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,662,918		$ 1,383,475
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	6.375%		5.75%
Capital Required for Capital Adequacy	$ 2,575,893		$ 2,225,591
Capital Required for Capital Adequacy to Risk Weighted Assets	9.875%		9.25%
Tier One Risk Based Capital Required for Capital Adequacy	$ 2,054,193		$ 1,744,382
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.875%		7.25%
Tier One Leverage Capital Required for Capital Adequacy	$ 982,989		$ 1,002,144
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phased-In [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,828,245		$ 1,685,464
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	7.00%		7.00%
Capital Required for Capital Adequacy	$ 2,742,368		$ 2,528,196
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%		10.50%
Tier One Risk Based Capital Required for Capital Adequacy	$ 2,220,012		$ 2,046,635
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%		8.50%
Tier One Leverage Capital Required for Capital Adequacy	$ 983,476		$ 1,002,494
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phased-In [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,825,950		$ 1,684,231
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	7.00%		7.00%
Capital Required for Capital Adequacy	$ 2,738,925		$ 2,526,347
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%		10.50%
Tier One Risk Based Capital Required for Capital Adequacy	$ 2,217,225		$ 2,045,138
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%		8.50%
Tier One Leverage Capital Required for Capital Adequacy	$ 982,989		$ 1,002,144
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%

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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	May 19, 2015
Restricted stock units, additional disclosures
Compensation expense	$ 5,226	$ 4,395	$ 11,197	$ 8,954
Unrecognized compensation expense related to unvested stock-settled awards	15,335		$ 15,335
Weighted average period over which expense is expected to be recognized, in years			2 years 11 months
SARs
Restricted stock units, additional disclosures
Compensation expense	43	74	$ 93	146
RSUs
Restricted stock units, additional disclosures
Compensation expense	2,078	1,714	3,974	3,307
Restricted stock
Restricted stock units, additional disclosures
Compensation expense	13	4	24	8
Cash-settled performance units
Restricted stock units, additional disclosures
Compensation expense	$ 3,092	$ 2,603	$ 7,106	$ 5,493
2015 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that can be issued for compensation under the Plan					2,550,000

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INCOME TAXES (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax Cuts And Jobs Act Of 2017, change in tax rate, income tax expense (benefit)			$ 17.6
U.S. statutory rate	21.00%	35.00%
State taxes	1.00%	1.00%
Non-deductible expenses	1.00%	0.00%
Non-taxable income	(1.00%)	(1.00%)
Other	(1.00%)	(1.00%)
Effective tax rate	21.00%	34.00%

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FAIR VALUE DISCLOSURES (Assets and Liabilities) (Details) - USD ($)		Jun. 30, 2018		Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value		$ 24,408,000		$ 23,511,000
Loans held for sale		1,275,466,000		1,007,695,000
OREO	[1],[2]	11,526,000		11,742,000
Derivative assets		21,740,000		16,719,000
Derivative liabilities		25,516,000		17,377,000
Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[3]	8,785,000		10,945,000
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[4]	0		0
Derivative assets	[4]	0		0
Derivative liabilities	[4]	0		0
Non-qualified deferred compensation plan liabilities		9,192,000	[4]	5,587,000	[5]
Fair value measurements, recurring basis | Level 1 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6]	0		0
Fair value measurements, recurring basis | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6],[7]	8,711,000		5,460,000
Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[4]	1,247,537,000		1,007,695,000
Derivative assets	[4]	21,740,000		16,719,000
Derivative liabilities	[4]	25,516,000		17,377,000
Non-qualified deferred compensation plan liabilities		0	[4]	0	[5]
Fair value measurements, recurring basis | Level 2 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6]	8,785,000		10,945,000
Fair value measurements, recurring basis | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6],[7]	6,912,000		7,106,000
Fair value measurements, recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[4]	27,929,000		0
Derivative assets	[4]	0		0
Derivative liabilities	[4]	0		0
Non-qualified deferred compensation plan liabilities		0	[4]	0	[5]
Fair value measurements, recurring basis | Level 3 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6]	0		0
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[6],[7]	0		0
Fair value measurements, nonrecurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	[1],[8]	0		0
OREO	[1],[2]	0		0
Fair value measurements, nonrecurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	[1],[8]	0		0
OREO	[1],[2]	0		0
Fair value measurements, nonrecurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	[1],[8]	22,165,000		21,216,000
OREO	[1],[2]	$ 9,526,000		$ 11,742,000

[1] Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.

[2] OREO is transferred from loans to OREO at fair value less selling costs.

[3] Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties.

[4] Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.

[5] Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.

[6] Securities are measured at fair value on a recurring basis, generally monthly.

[7] Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.

[8] Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

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FAIR VALUE DISCLOSURES (Financial Instruments) (Details)		3 Months Ended	6 Months Ended
		Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period			$ 1,007,695,000
Balance at End of Period		$ 1,275,466,000	1,275,466,000
Fair Value Inputs, Projected Price				0.943
OREO	[1],[2]			$ 11,526,000	$ 11,742,000
Real Estate Owned, Valuation Allowance				2,000,000	0
Estimated Fair Value				24,408,000	23,511,000
Loans held for sale		1,275,466,000	1,007,695,000	1,275,466,000	1,007,695,000
Derivative assets				21,740,000	16,719,000
Senior Notes				281,586,000	281,406,000
Derivative liabilities				25,516,000	17,377,000
Level 1 | Carrying amount
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Cash and cash equivalents				3,462,794,000	2,905,591,000
Estimated Fair Value				8,711,000	5,460,000
Level 1 | Estimated fair value
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Cash and cash equivalents				3,462,794,000	2,905,591,000
Estimated Fair Value				8,711,000	5,460,000
Level 1 | Fair value measurements, recurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period	[3]		0
Balance at End of Period	[3]	0	0
Loans held for sale	[3]	0	0	0	0
Derivative assets	[3]			0	0
Derivative liabilities	[3]			0	0
Level 1 | Fair value measurements, nonrecurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
OREO	[1],[2]			0	0
Loans held for investment, net	[1],[4]			0	0
Level 2 | Carrying amount
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period			1,011,004,000
Balance at End of Period		1,248,839,000	1,248,839,000
Estimated Fair Value				15,697,000	18,051,000
Loans held for sale		1,248,839,000	1,011,004,000	1,248,839,000	1,011,004,000
Derivative assets				21,740,000	16,719,000
Federal funds purchased				510,221,000	359,338,000
Customer repurchase agreements				10,628,000	5,702,000
Other borrowings				4,000,000,000	2,800,000,000
Senior Notes				281,586,000	281,406,000
Derivative liabilities				25,516,000	17,377,000
Level 2 | Estimated fair value
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period			1,011,004,000
Balance at End of Period		1,248,839,000	1,248,839,000
Estimated Fair Value				15,697,000	18,051,000
Loans held for sale		1,248,839,000	1,011,004,000	1,248,839,000	1,011,004,000
Derivative assets				21,740,000	16,719,000
Federal funds purchased				510,221,000	359,338,000
Customer repurchase agreements				10,628,000	5,702,000
Other borrowings				4,000,000,000	2,800,000,000
Senior Notes				283,268,000	285,485,000
Derivative liabilities				25,516,000	17,377,000
Level 2 | Fair value measurements, recurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period	[3]		1,007,695,000
Balance at End of Period	[3]	1,247,537,000	1,247,537,000
Loans held for sale	[3]	1,247,537,000	1,007,695,000	1,247,537,000	1,007,695,000
Derivative assets	[3]			21,740,000	16,719,000
Derivative liabilities	[3]			25,516,000	17,377,000
Level 2 | Fair value measurements, nonrecurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
OREO	[1],[2]			0	0
Loans held for investment, net	[1],[4]			0	0
Level 3 | Carrying amount
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period			0
Balance at End of Period		27,929,000	27,929,000
Loans held for sale		27,929,000	0	27,929,000	0
Loans held for investment, net				22,280,683,000	20,489,757,000
Deposits				20,334,871,000	19,123,180,000
Trust preferred subordinated debentures				113,406,000	113,406,000
Level 3 | Estimated fair value
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period			0
Balance at End of Period		27,929,000	27,929,000
Loans held for sale		27,929,000	0	27,929,000	0
Loans held for investment, net				22,258,008,000	20,480,802,000
Deposits				21,258,150,000	19,124,121,000
Trust preferred subordinated debentures				113,406,000	113,406,000
Level 3 | Fair value measurements, recurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period	[3]		0
Balance at End of Period	[3]	27,929,000	27,929,000
Loans held for sale	[3]	27,929,000	0	27,929,000	0
Derivative assets	[3]			0	0
Derivative liabilities	[3]			0	0
Level 3 | Fair value measurements, recurring basis | Estimated fair value
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at Beginning of Period		34,251,000	0
Purchases / Additions		1,437,000	37,529,000
Sales / Reductions		(7,988,000)	(7,988,000)
Realized		161,000	(1,680,000)
Unrealized		68,000	68,000
Balance at End of Period		27,929,000	27,929,000
Loans held for sale		$ 34,251,000	$ 0	27,929,000	0
Level 3 | Fair value measurements, nonrecurring basis
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Carrying value of impaired loans				30,100,000	32,200,000
Allowance allocation of impaired loans				7,900,000	11,000,000
OREO	[1],[2]			9,526,000	11,742,000
Loans held for investment, net	[1],[4]			$ 22,165,000	$ 21,216,000

[1] Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.

[2] OREO is transferred from loans to OREO at fair value less selling costs.

[3] Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.

[4] Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

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DERIVATIVE FINANCIAL INSTRUMENTS (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) instrument	Dec. 31, 2017 USD ($) instrument
Derivatives, Fair Value [Line Items]
Asset Derivative	$ 27,269	$ 21,354
Liability Derivative	31,045	22,012
Offsetting derivative asset	(5,529)	(4,635)
Offsetting derivative liability	(5,529)	(4,635)
Derivative asset, net	21,740	16,719
Derivative liability, net	$ 25,516	17,377
Description of credit risk exposure on interest rate swaps and caps	Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In some cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceeds a nominal amount
Credit exposure relating to interest rate swaps and caps	$ 12,900	16,700
Cash collateral pledge for derivatives	6,700	15,200
Interest-bearing deposits
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	2,800	14,000
Accrued interest receivable and other assets
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	3,900	$ 1,200
Interest-bearing Deposit Liability
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	$ 11,100
Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease | Weighted-average interest rate received
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	3.85%	3.59%
Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease | Weighted-average interest rate paid
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	4.17%	4.34%
Commercial loan/lease interest rate caps
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	2.38%	2.40%
Risk Participation Agreement - Participant Bank [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 130,200	$ 157,100
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 157	$ 221
Derivative, number of instruments held | instrument	14	15
Risk Participation Agreements - Lead Bank [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 126,500	$ 86,300
Derivative, number of instruments held | instrument	11	10
Financial institution counterparties: | Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	$ 1,514,867	$ 1,393,764
Asset Derivative	17,079	4,736
Liability Derivative	6,239	15,482
Financial institution counterparties: | Commercial loan/lease interest rate caps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	245,667	242,700
Asset Derivative	992	421
Liability Derivative	18	7
Financial institution counterparties: | Foreign Exchange Forward [Member] | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	53,871	2,466
Asset Derivative	1,794	4
Liability Derivative	58	69
Customer counterparties: | Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	1,514,867	1,393,764
Asset Derivative	6,239	15,482
Liability Derivative	17,079	4,736
Customer counterparties: | Commercial loan/lease interest rate caps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	245,667	242,700
Asset Derivative	18	7
Liability Derivative	992	421
Customer counterparties: | Foreign Exchange Forward [Member] | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	53,871	2,466
Asset Derivative	58	69
Liability Derivative	1,794	4
Loan purchase commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivative	1,089	635
Liability Derivative	21	190
Forward sales commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Asset Derivative	0	0
Liability Derivative	4,844	1,103
Loan Purchase Commitments [Member] | Interest rate derivative | Non-hedging interest rate derivatives/swaps
Derivatives, Fair Value [Line Items]
Notional Amount	204,057	253,815
Forward Contracts [Member] | Interest rate derivative | Non-hedging interest rate derivatives/swaps
Derivatives, Fair Value [Line Items]
Notional Amount	$ 1,361,500	$ 1,086,224