10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

________________________________________________________ 

FORM 10-Q

________________________________________________________ 

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 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 0-20288

 ________________________________________________________

COLUMBIA BANKING SYSTEM, INC.

(Exact name of registrant as specified in its charter)

 ________________________________________________________

Washington	91-1422237
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
1301 A Street Tacoma, Washington	98402-2156
(Address of principal executive offices)	(Zip Code)

(253) 305-1900

(Registrant’s telephone number, including area code)

(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 Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

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

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

Large accelerated filer	☒		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  ☒

The number of shares of common stock outstanding at April 30, 2018 was 73,238,908.

TABLE OF CONTENTS

		Page
	PART I — FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited)
	Consolidated Balance Sheets - March 31, 2018 and December 31, 2017	1
	Consolidated Statements of Income - three months ended March 31, 2018 and 2017	2
	Consolidated Statements of Comprehensive Income - three months ended March 31, 2018 and 2017	3
	Consolidated Statements of Changes in Shareholders’ Equity - three months ended March 31, 2018 and 2017	4
	Consolidated Statements of Cash Flows - three months ended March 31, 2018 and 2017	5
	Notes to Unaudited Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	49
Item 4.	Controls and Procedures	49
	PART II — OTHER INFORMATION
Item 1.	Legal Proceedings	50
Item 1A.	Risk Factors	50
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	50
Item 3.	Defaults Upon Senior Securities	50
Item 4.	Mine Safety Disclosures	50
Item 5.	Other Information	50
Item 6.	Exhibits	51
	Signatures	52

i

PART I - FINANCIAL INFORMATION

Item 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS

Columbia Banking System, Inc.

(Unaudited)

			March 31, 2018			December 31, 2017
ASSETS			(in thousands)
Cash and due from banks			$	206,532		$	244,615
Interest-earning deposits with banks			87,124			97,918
Total cash and cash equivalents			293,656			342,533
Debt securities available for sale at fair value			2,624,045			2,737,751
Equity securities at fair value			5,000			5,080
Federal Home Loan Bank stock at cost			11,640			10,440
Loans held for sale			4,312			5,766
Loans, net of unearned income			8,339,631			8,358,657
Less: allowance for loan and lease losses			79,827			75,646
Loans, net			8,259,804			8,283,011
Interest receivable			41,795			40,881
Premises and equipment, net			168,366			169,490
Other real estate owned			11,507			13,298
Goodwill			765,842			765,842
Other intangible assets, net			54,985			58,173
Other assets			289,684			284,621
Total assets			$	12,530,636		$	12,716,886
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits:
Noninterest-bearing			$	4,927,226		$	5,081,901
Interest-bearing			5,468,297			5,450,184
Total deposits			10,395,523			10,532,085
Federal Home Loan Bank advances			41,564			11,579
Securities sold under agreements to repurchase			24,247			79,059
Subordinated debentures			35,601			35,647
Junior subordinated debentures			—			8,248
Other liabilities			85,778			100,346
Total liabilities			10,582,713			10,766,964
Commitments and contingent liabilities (Note 12)
Shareholders’ equity:
	March 31, 2018	December 31, 2017
	(in thousands)
Common stock (no par value)
Authorized shares	115,000	115,000
Issued and outstanding	73,240	73,020	1,634,916			1,634,705
Retained earnings			361,140			337,442
Accumulated other comprehensive loss			(48,133		)	(22,225		)
Total shareholders’ equity			1,947,923			1,949,922
Total liabilities and shareholders’ equity			$	12,530,636		$	12,716,886

See accompanying Notes to unaudited Consolidated Financial Statements.

1

CONSOLIDATED STATEMENTS OF INCOME

Columbia Banking System, Inc.

(Unaudited)

	Three Months Ended
	March 31,
	2018		2017
	(in thousands except per share amounts)
Interest Income
Loans	$	103,027	$	74,120
Taxable securities	12,708		10,986
Tax-exempt securities	3,064		2,691
Deposits in banks	345		19
Total interest income	119,144		87,816
Interest Expense
Deposits	2,509		787
Federal Home Loan Bank advances	570		225
Subordinated debentures	468		—
Other borrowings	116		129
Total interest expense	3,663		1,141
Net Interest Income	115,481		86,675
Provision for loan and lease losses	5,852		2,775
Net interest income after provision for loan and lease losses	109,629		83,900
Noninterest Income
Deposit account and treasury management fees	8,740		7,287
Card revenue	5,813		5,723
Financial services and trust revenue	2,730		2,839
Loan revenue	3,186		3,593
Merchant processing revenue	—		2,019
Bank owned life insurance	1,426		1,280
Investment securities gains, net	22		—
Change in FDIC loss-sharing asset	—		(274		)
Other	1,226		2,392
Total noninterest income	23,143		24,859
Noninterest Expense
Compensation and employee benefits	50,570		40,825
Occupancy	10,121		7,191
Merchant processing expense	—		1,049
Advertising and promotion	1,429		817
Data processing	5,270		4,208
Legal and professional fees	3,237		3,369
Taxes, licenses and fees	1,425		1,241
Regulatory premiums	937		776
Net cost of operation of other real estate owned	1		152
Amortization of intangibles	3,188		1,349
Other	9,809		8,009
Total noninterest expense	85,987		68,986
Income before income taxes	46,785		39,773
Income tax provision	6,815		10,574
Net Income	$	39,970	$	29,199
Earnings per common share
Basic	$	0.55	$	0.50
Diluted	$	0.55	$	0.50
Dividends paid per common share	$	0.22	$	0.22
Weighted average number of common shares outstanding	72,300		57,388
Weighted average number of diluted common shares outstanding	72,305		57,394

See accompanying Notes to unaudited Consolidated Financial Statements.

2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Columbia Banking System, Inc.

(Unaudited) 

	Three Months Ended
	March 31,
	2018			2017
	(in thousands)
Net income	$	39,970		$	29,199
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) from securities:
Net unrealized holding gain (loss) from available for sale debt securities arising during the period, net of tax of $7,891 and ($968)	(26,048		)	1,702
Reclassification adjustment of net gain from sale of available for sale debt securities included in income, net of tax of $24 and $0	(78		)	—
Net unrealized gain (loss) from securities, net of reclassification adjustment	(26,126		)	1,702
Pension plan liability adjustment:
Reduction in unfunded defined benefit plan liability during the period, net of tax of $0 and ($2,622)	—			4,604
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax of ($19) and ($49)	61			87
Pension plan liability adjustment, net	61			4,691
Other comprehensive income (loss)	(26,065		)	6,393
Total comprehensive income	$	13,905		$	35,592

See accompanying Notes to unaudited Consolidated Financial Statements.

3

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

Columbia Banking System, Inc.

(Unaudited)

	Preferred Stock					Common Stock					Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Total Shareholders’ Equity
	Number of Shares		Amount			Number of Shares		Amount
	(in thousands)
Balance at January 1, 2018	—		$	—		73,020		$	1,634,705		$	337,442		$	(22,225	)	$	1,949,922
Adjustment to opening retained earnings pursuant to adoption of ASU 2016-01	—		—			—		—			(203		)	157			(46		)
Net income	—		—			—		—			39,970			—			39,970
Other comprehensive loss	—		—			—		—			—			(26,065		)	(26,065		)
Issuance of common stock - stock option and other plans	—		—			17		719			—			—			719
Activity in deferred compensation plan	—		—			—		3			—			—			3
Issuance of common stock - restricted stock awards, net of canceled awards	—		—			263		2,064			—			—			2,064
Purchase and retirement of common stock	—		—			(60	)	(2,575		)	—			—			(2,575		)
Cash dividends paid on common stock	—		—			—		—			(16,069		)	—			(16,069		)
Balance at March 31, 2018	—		$	—		73,240		$	1,634,916		$	361,140		$	(48,133	)	$	1,947,923
Balance at January 1, 2017	9		$	2,217		58,042		$	995,837		$	271,957		$	(18,999	)	$	1,251,012
Adjustment to opening retained earnings pursuant to adoption of ASU 2016-09	—		—			—		184			(117		)	—			67
Net income	—		—			—		—			29,199			—			29,199
Other comprehensive income	—		—			—		—			—			6,393			6,393
Issuance of common stock - stock option and other plans	—		—			28		1,145			—			—			1,145
Issuance of common stock - restricted stock awards, net of canceled awards	—		—			207		2,358			—			—			2,358
Preferred stock conversion to common stock	(9	)	(2,217		)	102		2,217			—			—			—
Purchase and retirement of common stock	—		—			(50	)	(2,039		)	—			—			(2,039		)
Cash dividends paid on common stock	—		—			—		—			(12,792		)	—			(12,792		)
Balance at March 31, 2017	—		$	—		58,329		$	999,702		$	288,247		$	(12,606	)	$	1,275,343

See accompanying Notes to unaudited Consolidated Financial Statements.

4

CONSOLIDATED STATEMENTS OF CASH FLOWS Columbia Banking System, Inc. (Unaudited)
	Three Months Ended March 31,
	2018			2017
	(in thousands)
Cash Flows From Operating Activities
Net income	$	39,970		$	29,199
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses	5,852			2,775
Stock-based compensation expense	2,064			2,358
Depreciation, amortization and accretion	7,618			6,074
Investment securities gains, net	(22		)	—
Net realized (gain) loss on sale of premises and equipment, loans held for investment and other assets	(630		)	55
Net realized loss on sale and valuation adjustments of other real estate owned	135			204
Gain on bank owned life insurance death benefit	—			(1,514		)
Originations of loans held for sale	(27,553		)	(31,295		)
Proceeds from sales of loans held for sale	29,007			33,896
Net change in:
Interest receivable	(914		)	(1,271		)
Interest payable	452			(9		)
Other assets	2,530			(650		)
Other liabilities	(15,014		)	(3,841		)
Net cash provided by operating activities	43,495			35,981
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	17,688			(21,936		)
Purchases of:
Debt securities available for sale	(27,497		)	(108,958		)
Premises and equipment	(2,099		)	(336		)
Federal Home Loan Bank stock	(45,080		)	(31,400		)
Proceeds from:
FDIC reimbursement on loss-sharing asset	—			26
Sales of debt securities available for sale	19,761			—
Principal repayments and maturities of debt securities available for sale	82,643			55,369
Sales of premises and equipment and loans held for investment	3,721			6,893
Redemption of Federal Home Loan Bank stock	43,880			31,040
Sales of other real estate and other personal property owned	2,062			1,275
Payments to FDIC related to loss-sharing asset	—			(210		)
Net cash provided by (used in) investing activities	95,079			(68,237		)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(136,466		)	29,433
Net decrease in sweep repurchase agreements	(54,812		)	(33,908		)
Proceeds from:
Federal Home Loan Bank advances	1,127,000			785,000
Exercise of stock options	719			1,145
Payments for:
Repayment of Federal Home Loan Bank advances	(1,097,000		)	(776,000		)
Common stock dividends	(16,069		)	(12,792		)
Repayment of junior subordinated debentures	(8,248		)	—
Purchase and retirement of common stock	(2,575		)	(2,039		)
Net cash used in financing activities	(187,451		)	(9,161		)
Decrease in cash and cash equivalents	(48,877		)	(41,417		)
Cash and cash equivalents at beginning of period	342,533			224,238
Cash and cash equivalents at end of period	$	293,656		$	182,821

5

CONSOLIDATED STATEMENTS OF CASH FLOWS, Continued Columbia Banking System, Inc. (Unaudited)
	Three Months Ended March 31,
	2018		2017
	(in thousands)
Supplemental Information:
Cash paid during the period for:
Cash paid for interest	$	3,211	$	1,150
Cash paid for income tax	$	24	$	—
Non-cash investing and financing activities
Loans transferred to other real estate owned	$	406	$	—

See accompanying Notes to unaudited Consolidated Financial Statements.

6

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

Columbia Banking System, Inc.

1. Basis of Presentation, Significant Accounting Policies and Recent Developments

Basis of Presentation

The interim unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with instructions to Form 10-Q and Article 10 of Regulation S-X. The Consolidated Financial Statements include the accounts of Columbia Banking System, Inc. (“we”, “our”, “Columbia” or the “Company”) and its subsidiaries, including its wholly owned banking subsidiary Columbia State Bank (“Columbia Bank” or the “Bank”) and Columbia Trust Company (“Columbia Trust”). All intercompany transactions and accounts have been eliminated in consolidation. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of results to be anticipated for the year ending December 31, 2018. The accompanying interim unaudited Consolidated Financial Statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2017 Annual Report on Form 10-K.

Significant Accounting Policies

The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2017 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2017 Form 10-K disclosure for the year ended December 31, 2017.

Reclassifications

Certain amounts reported in prior periods may have been reclassified in the Consolidated Financial Statements to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

2. Accounting Pronouncements Recently Issued

In August 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments in this ASU provide specific guidance on several statement of cash flow classification issues to reduce diversity in practice. The amendments in ASU 2016-15 are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The Company has reclassified items in the Statement of Cash Flows for the three months ended March 31, 2017 to conform with its current presentation based on its adoption of ASU 2016-15.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. The amendments included in this ASU require an entity to reflect its current estimate of all expected credit losses for assets held at an amortized cost basis. For available for sale debt securities, credit losses will be measured in a manner similar to current GAAP, however, this ASU will require that credit losses be presented as an allowance rather than as a write-down. The amendments in ASU 2016-13 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and are required to be adopted through a modified retrospective approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the ASU is effective.

Currently, the Company cannot reasonably estimate the impact that adoption of ASU 2016-13 will have on its Consolidated Financial Statements; however, the impact may be significant. That assessment is based upon the fact that, unlike the incurred loss models in existing GAAP, the current expected credit loss (“CECL”) model in ASU 2016-13 does not specify a threshold for the recognition of an impairment allowance. Rather, the Company will recognize an impairment allowance equal to its estimate of lifetime expected credit losses, adjusted for prepayments, for in-scope financial instruments as of the end of the reporting period. Accordingly, the impairment allowance measured under the CECL model could increase significantly from the impairment allowance measured under the Company’s existing incurred loss model. Significant CECL implementation matters to be addressed by the Company include selecting loss estimation methodologies, identifying, sourcing and storing data, addressing data gaps, defining a reasonable and supportable forecast period, selecting historical loss information which will be reverted to, documenting the CECL estimation process, assessing the impact to internal controls over financial reporting, capital planning and seeking process approval from audit and regulatory stakeholders.

7

In February 2016, the FASB issued ASU 2016-02, Leases. The amendments included in this ASU create a new accounting model for both lessees and lessors. The new guidance requires lessees to recognize lease liabilities, initially measured as the present value of future lease payments, and corresponding right-of-use assets for all leases with lease terms greater than 12 months. This model differs from the current lease accounting model, which does not require such lease liabilities and corresponding right-of-use assets to be recorded for operating leases. The amendments in ASU 2016-02 must be adopted using the modified retrospective approach and will be effective for the first interim or annual period beginning after December 15, 2018. Early adoption is permitted. During 2017, the Company selected a third-party lease accounting application to assist in the implementation of this new guidance. Significant implementation matters to be addressed by the Company include assessing the impact to our internal controls over financial reporting and documenting the new lease accounting process. We do not expect a material impact to our Consolidated Statement of Income as a result of this ASU. See Note 18, “Commitments and Contingent Liabilities” to our 2017 Form 10-K, for more information regarding the minimum future payments related to our operating leases.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 require all equity investments to be measured at fair value with changes in the fair value recognized through net income. The amendments in ASU 2016-01 also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. In addition, the amendments in this update eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet for public business entities. The amendments in ASU 2016-01 are effective for the first interim or annual period beginning after December 15, 2017. The Company adopted the amendments of ASU 2016-01 effective January 1, 2018 and recorded a cumulative effect adjustment of $203 thousand to retained earnings related to the unrealized holding losses on equity securities with readily determinable fair value included in accumulated other comprehensive loss. The Company also added a separate line item on the Consolidated Balance Sheet for equity securities at fair value and reclassified amounts previously included in securities available for sale at fair value to conform to current period presentation. In addition, as required by the ASU, the fair value disclosure for loans is computed using an exit price notion and deposits with no stated maturity are no longer included in the fair value disclosures in Note 15.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. The guidance requires that revenue from contracts with customers be recognized when transfer of control over goods or services is passed to customers in the amount of consideration expected to be received. Subsequent Accounting Standard Updates have been issued clarifying the original pronouncement (ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20). The majority of the Company’s revenue is comprised of interest income from financial assets, which is specifically outside the scope of ASU 2014-09.

On January 1, 2018, we adopted the accounting guidance in ASU 2014-09 and all the related amendments (“Topic 606”) using the modified retrospective method for all contracts that have not been completed (i.e. open contracts). Therefore, the comparative information has not been adjusted and continues to be reported under Topic 605. There was no cumulative effect adjustment as of January 1, 2018, and there were no material changes to the timing or amount of revenue recognized for the three months ended March 31, 2018; however, additional disclosures were incorporated in the footnotes upon adoption. See Note 17, “Revenue from Contracts with Customers,” for more information.

3. Business Combinations

On November 1, 2017, the Company completed its acquisition of Pacific Continental Corporation (“Pacific Continental”) and its wholly-owned banking subsidiary Pacific Continental Bank. The Company acquired 100% of the equity interests of Pacific Continental. The primary reasons for the acquisition were to expand in the Eugene, Oregon market and improve branch network efficiencies in the Seattle and Portland markets.

The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the November 1, 2017 acquisition date. Initial accounting for deferred taxes was incomplete as of March 31, 2018. The deferred taxes currently recognized in the financial statements have been determined provisionally as the final Pacific Continental tax return has not yet been completed. The application of the acquisition method of accounting resulted in the recognition of goodwill of $383.1 million and a core deposit intangible of $46.9 million, or 2.34% of core deposits. The goodwill represents the excess purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes.

8

The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:

	November 1, 2017
	(in thousands)
Merger consideration				$	637,103
Identifiable net assets acquired, at fair value
Assets acquired
Cash and cash equivalents	$	81,190
Investment securities	449,291
Federal Home Loan Bank stock	7,084
Loans	1,873,987
Interest receivable	7,827
Premises and equipment	27,343
Other real estate owned	10,279
Core deposit intangible	46,875
Other assets	50,638
Total assets acquired				2,554,514
Liabilities assumed
Deposits	(2,118,982		)
Federal Home Loan Bank advances	(101,127		)
Subordinated debentures	(35,678		)
Junior subordinated debentures	(14,434		)
Securities sold under agreements to repurchase	(1,617		)
Other liabilities	(28,653		)
Total liabilities assumed				(2,300,491		)
Total fair value of identifiable net assets, at fair value				254,023
Goodwill				$	383,080

See Note 8, “Goodwill and Other Intangible Assets,” for further discussion of the accounting for goodwill and other intangible assets.

The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period January 1, 2018 to March 31, 2018. Disclosure of the amount of Pacific Continental’s revenue and net income (excluding integration costs) included in Columbia’s Consolidated Statements of Income is impracticable due to the integration of the operations and accounting for this acquisition.

9

For illustrative purposes only, the following table presents certain unaudited pro forma information for the three months ended March 31, 2017. This unaudited estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.

	Unaudited Pro Forma
	Three Months Ended March 31,
	2017
	(in thousands except per share)
Total revenues (net interest income plus noninterest income)	$	139,363
Net income	$	37,147
Earnings per share - basic	$	0.52
Earnings per share - diluted	$	0.52

The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Noninterest Expense
Compensation and employee benefits	$	1,556	$	—
Occupancy	1,004		1
Advertising and promotion	512		6
Data processing	287		—
Legal and professional fees	574		1,311
Other	332		46
Total impact of acquisition-related costs to noninterest expense	$	4,265	$	1,364

As a result of the acquisition of Pacific Continental, we have consolidated assets exceeding $10 billion and we will be subject to the interchange fee cap imposed under the Dodd-Frank Wall Street Reform and Consumer Protection Act beginning July 1, 2018. We currently anticipate a pre-tax annual impact of approximately $10 million because we will no longer qualify for the small issuer exemption.

10

4. Securities

The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,693,149	$	698	$	(48,629	)	$	1,645,218
State and municipal securities	588,218		3,467		(8,937		)	582,748
U.S. government agency and government-sponsored enterprise securities	402,036		43		(6,247		)	395,832
U.S. government securities	251		—		(4		)	247
Total	$	2,683,654	$	4,208	$	(63,817	)	$	2,624,045
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,752,236	$	1,815	$	(27,326	)	$	1,726,725
State and municipal securities	593,940		6,023		(3,959		)	596,004
U.S. government agency and government-sponsored enterprise securities	416,894		642		(2,762		)	414,774
U.S. government securities	251		—		(3		)	248
Total	$	2,763,321	$	8,480	$	(34,050	)	$	2,737,751

The following table provides the proceeds and gross realized gains and losses on sales of debt securities available for sale as well as other securities gains and losses for the periods indicated:

	Three Months Ended
	March 31,
	2018			2017
	(in thousands)
Proceeds from sales of debt securities available for sale	$	19,761		$	—
Gross realized gains from sales of debt securities available for sale	$	148		$	—
Gross realized losses from sales of debt securities available for sale	(46		)	—
Other securities losses, net (1)	(80		)	—
Investment securities gains, net	$	22		$	—

__________

(1) Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.

The scheduled contractual maturities of debt securities available for sale at March 31, 2018 are presented as follows:

	March 31, 2018
	Amortized Cost		Fair Value
	(in thousands)
Due within one year	$	161,538	$	161,314
Due after one year through five years	635,254		626,693
Due after five years through ten years	756,950		737,927
Due after ten years	1,129,912		1,098,111
Total debt securities available for sale	$	2,683,654	$	2,624,045

11

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

	March 31, 2018
	(in thousands)
Washington and Oregon State to secure public deposits	$	246,950
Federal Reserve Bank to secure borrowings	52,754
Other securities pledged	102,363
Total securities pledged as collateral	$	402,067

The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018 and December 31, 2017:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	921,993	$	(19,073	)	$	681,577	$	(29,556	)	$	1,603,570	$	(48,629	)
State and municipal securities	315,392		(4,972		)	76,452		(3,965		)	391,844		(8,937		)
U.S. government agency and government-sponsored enterprise securities	251,626		(3,969		)	140,455		(2,278		)	392,081		(6,247		)
U.S. government securities	247		(4		)	—		—			247		(4		)
Total	$	1,489,258	$	(28,018	)	$	898,484	$	(35,799	)	$	2,387,742	$	(63,817	)
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	816,678	$	(6,710	)	$	717,211	$	(20,616	)	$	1,533,889	$	(27,326	)
State and municipal securities	220,019		(1,723		)	75,172		(2,236		)	295,191		(3,959		)
U.S. government agency and government-sponsored enterprise securities	184,046		(1,006		)	155,983		(1,756		)	340,029		(2,762		)
U.S. government securities	249		(3		)	—		—			249		(3		)
Total	$	1,220,992	$	(9,442	)	$	948,366	$	(24,608	)	$	2,169,358	$	(34,050	)

At March 31, 2018, there were 446 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 117 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

At March 31, 2018, there were 406 state and municipal government securities in an unrealized loss position, of which 71 were in a continuous loss position for 12 months or more. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of March 31, 2018, none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

12

At March 31, 2018, there were 50 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, of which 16 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

At March 31, 2018, there was one U.S. government security in an unrealized loss position, which was not in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where this investment falls within the yield curve and its individual characteristics. Because the Company does not currently intend to sell this security nor does the Company consider it more likely than not that it will be required to sell this security before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider this investment to be other-than-temporarily impaired at March 31, 2018.

5. Loans

The Company’s loan portfolio includes originated and purchased loans. Originated loans and purchased loans for which there was no evidence of credit deterioration at their acquisition date and it was probable that we would be able to collect all contractually required payments are referred to collectively as loans, excluding purchased credit impaired loans. Purchased loans for which there was, at acquisition date, evidence of credit deterioration since their origination and it was probable that we would be unable to collect all contractually required payments are referred to as purchased credit impaired loans, or “PCI loans.”

The following is an analysis of the loan portfolio by segment (net of unearned income):

	March 31, 2018									December 31, 2017
	Loans, excluding PCI loans			PCI Loans			Total			Loans, excluding PCI loans			PCI Loans			Total
	(in thousands)
Commercial business	$	3,402,162		$	13,536		$	3,415,698		$	3,377,324		$	12,628		$	3,389,952
Real estate:
One-to-four family residential	182,302			10,684			192,986			188,396			12,395			200,791
Commercial and multifamily residential	3,776,709			73,446			3,850,155			3,825,739			75,594			3,901,333
Total real estate	3,959,011			84,130			4,043,141			4,014,135			87,989			4,102,124
Real estate construction:
One-to-four family residential	208,441			171			208,612			200,518			177			200,695
Commercial and multifamily residential	385,339			611			385,950			371,931			607			372,538
Total real estate construction	593,780			782			594,562			572,449			784			573,233
Consumer	323,631			10,851			334,482			334,190			11,269			345,459
Less: Net unearned income	(48,252		)	—			(48,252		)	(52,111		)	—			(52,111		)
Total loans, net of unearned income	8,230,332			109,299			8,339,631			8,245,987			112,670			8,358,657
Less: Allowance for loan and lease losses	(74,162		)	(5,665		)	(79,827		)	(68,739		)	(6,907		)	(75,646		)
Total loans, net	$	8,156,170		$	103,634		$	8,259,804		$	8,177,248		$	105,763		$	8,283,011
Loans held for sale	$	4,312		$	—		$	4,312		$	5,766		$	—		$	5,766

At March 31, 2018 and December 31, 2017, the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.

13

The Company has made loans to executive officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans was $9.9 million and $10.0 million at March 31, 2018 and December 31, 2017, respectively. During the first three months of 2018, there were no advances and $86 thousand in repayments.

At March 31, 2018 and December 31, 2017, $2.28 billion and $2.25 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank of Des Moines (“FHLB”) borrowings and additional borrowing capacity. The Company has also pledged $72.5 million and $70.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at March 31, 2018 and December 31, 2017, respectively.

The following is an analysis of nonaccrual loans as of March 31, 2018 and December 31, 2017:

	March 31, 2018				December 31, 2017
	Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans		Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans
	(in thousands)
Commercial business:
Secured	$	57,504	$	69,056	$	45,410	$	56,865
Unsecured	115		115		50		49
Real estate:
One-to-four family residential	1,054		1,426		785		1,182
Commercial & multifamily residential:
Commercial land	3,192		3,201		2,628		2,623
Income property	3,980		4,264		4,284		5,410
Owner occupied	7,367		7,621		7,029		7,270
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		25		26
Residential construction	1,210		1,210		1,829		1,828
Consumer	4,042		4,378		4,149		4,633
Total	$	78,464	$	91,271	$	66,189	$	79,886

14

Loans, excluding purchased credit impaired loans

The following is an aging of the recorded investment of the loan portfolio as of March 31, 2018 and December 31, 2017:

	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,189,473	$	16,410	$	2,872	$	—	$	19,282	$	57,504	$	3,266,259
Unsecured	119,863		50		51		—		101		115		120,079
Real estate:
One-to-four family residential	179,174		340		—		—		340		1,054		180,568
Commercial & multifamily residential:
Commercial land	283,973		2,299		—		—		2,299		3,192		289,464
Income property	1,867,450		1,929		815		—		2,744		3,980		1,874,174
Owner occupied	1,570,051		10,751		2,772		—		13,523		7,367		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	5,937		318		285		—		603		—		6,540
Residential construction	199,756		112		—		—		112		1,210		201,078
Commercial & multifamily residential:
Income property	295,067		11,070		—		—		11,070		—		306,137
Owner occupied	73,016		—		—		—		—		—		73,016
Consumer	316,557		1,229		248		—		1,477		4,042		322,076
Total	$	8,100,317	$	44,508	$	7,043	$	—	$	51,551	$	78,464	$	8,230,332
	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,185,321	$	2,530	$	2,400	$	—	$	4,930	$	45,410	$	3,235,661
Unsecured	123,524		100		501		—		601		50		124,175
Real estate:
One-to-four family residential	184,256		1,111		402		—		1,513		785		186,554
Commercial & multifamily residential:
Commercial land	292,680		92		—		581		673		2,628		295,981
Income property	1,898,655		2,426		971		—		3,397		4,284		1,906,336
Owner occupied	1,590,004		2,485		468		—		2,953		7,029		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		—		—		—		25		9,907
Residential construction	187,862		—		—		—		—		1,829		189,691
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		293,028
Owner occupied	72,443		—		—		—		—		—		72,443
Consumer	325,928		1,446		702		—		2,148		4,149		332,225
Total	$	8,163,583	$	10,190	$	5,444	$	581	$	16,215	$	66,189	$	8,245,987

15

The following is an analysis of impaired loans as of March 31, 2018 and December 31, 2017:

	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,221,659	$	44,600	$	13,836	$	18,931	$	5,657	$	30,764	$	33,785
Unsecured	120,056		23		23		23		2		—		—
Real estate:
One-to-four family residential	179,700		868		428		715		22		440		1,017
Commercial & multifamily residential:
Commercial land	286,613		2,851		—		—		—		2,851		2,860
Income property	1,870,614		3,560		—		—		—		3,560		3,623
Owner occupied	1,582,385		8,556		3,399		4,821		5		5,157		5,269
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		—		—
Residential construction	199,868		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	306,137		—		—		—		—		—		—
Owner occupied	68,966		4,050		—		—		—		4,050		4,050
Consumer	315,845		6,231		5,439		5,707		171		792		860
Total	$	8,158,383	$	71,949	$	23,125	$	30,197	$	5,857	$	48,824	$	52,674
	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,195,649	$	40,012	$	3,808	$	3,937	$	1,867	$	36,204	$	42,314
Unsecured	124,150		25		25		24		3		—		—
Real estate:
One-to-four family residential	185,659		895		867		1,408		103		28		337
Commercial & multifamily residential:
Commercial land	293,694		2,287		—		—		—		2,287		2,282
Income property	1,901,313		5,023		2,768		3,328		185		2,255		2,601
Owner occupied	1,591,298		8,688		77		80		3		8,611		10,077
Real estate construction:
One-to-four family residential:
Land and acquisition	9,907		—		—		—		—		—		—
Residential construction	188,481		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		—
Owner occupied	68,393		4,050		—		—		—		4,050		4,050
Consumer	325,210		7,015		5,303		5,568		199		1,712		1,864
Total	$	8,176,782	$	69,205	$	12,848	$	14,345	$	2,360	$	56,357	$	64,735

16

The following table provides additional information on impaired loans for the three month periods indicated:

	Three Months Ended March 31,
	2018				2017
	Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans		Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans
	(in thousands)
Commercial business:
Secured	$	42,306	$	12	$	8,303	$	19
Unsecured	24		—		—		—
Real estate:
One-to-four family residential	881		7		521		2
Commercial & multifamily residential:
Commercial land	2,569		—		1,504		—
Income property	4,292		31		4,059		1
Owner occupied	8,622		84		4,462		—
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		7		—
Residential construction	1,210		—		168		—
Commercial & multifamily residential:
Owner occupied	4,050		51		—		—
Consumer	6,623		54		5,370		27
Total	$	70,577	$	239	$	24,394	$	49

17

The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three months ended March 31, 2018 and 2017:

	Three months ended March 31, 2018					Three months ended March 31, 2017
	Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
	(dollars in thousands)
Commercial business:
Secured	1	$	450	$	450	3	$	356	$	356
Real estate:
Commercial and multifamily residential:
Income property	1	891		891		—	—		—
Consumer	7	1,143		1,143		10	1,546		1,546
Total	9	$	2,484	$	2,484	13	$	1,902	$	1,902

The Company’s loans classified as TDR are loans that have been modified or the borrower has been granted special concessions due to financial difficulties that, if not for the challenges of the borrower, the Company would not otherwise consider. The TDR modifications or concessions are made to increase the likelihood that these borrowers with financial difficulties will be able to satisfy their debt obligations as amended. The concessions granted in the restructurings summarized in the table above largely consisted of maturity extensions, interest rate modifications or a combination of both. In limited circumstances, a reduction in the principal balance of the loan could also be made as a concession. Credit losses for loans classified as TDR are measured on the same basis as impaired loans. For impaired loans, an allowance is established when the collateral value less selling costs (or discounted cash flows or observable market price) of the impaired loan is lower than the recorded investment of that loan.

The Company had commitments to lend $121 thousand of additional funds on loans classified as TDR as of March 31, 2018. The Company had $506 thousand of such commitments at December 31, 2017. The Company did not have any loans modified as TDR that defaulted within 12 months of being modified as TDR during the three months ended March 31, 2018 and 2017.

Purchased Credit Impaired Loans

Purchased credit impaired (“PCI”) loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis.

Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows.

Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix, which utilizes probability values of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools.

The excess of cash flows expected to be collected over the initial fair value of purchased credit impaired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates.

18

The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
	(in thousands)
Commercial business	$	14,201	$	13,753
Real estate:
One-to-four family residential	12,738		14,610
Commercial and multifamily residential	77,400		79,211
Total real estate	90,138		93,821
Real estate construction:
One-to-four family residential	171		177
Commercial and multifamily residential	589		595
Total real estate construction	760		772
Consumer	11,989		12,412
Subtotal of PCI loans	117,088		120,758
Less:
Valuation discount resulting from acquisition accounting	7,789		8,088
Allowance for loan losses	5,665		6,907
PCI loans, net of allowance for loan losses	$	103,634	$	105,763

The following table shows the changes in accretable yield for PCI loans for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance at beginning of period	$	31,176		$	45,191
Accretion	(2,265		)	(4,182		)
Disposals	(159		)	(158		)
Reclassifications from (to) nonaccretable difference	603			(2,407		)
Balance at end of period	$	29,355		$	38,444

6. Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit

We record an allowance for loan and lease losses (the “allowance”) to recognize management’s estimate of credit losses incurred in the loan portfolio at each balance sheet date. We have used the same methodology for allowance calculations during the three months ended March 31, 2018 and 2017.

19

The following tables show a detailed analysis of the allowance for the three months ended March 31, 2018 and 2017:

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2018	(in thousands)
Commercial business:
Secured	$	29,341	$	(2,414	)	$	553	$	9,851		$	37,331	$	5,657	$	31,674
Unsecured	2,000		(63		)	249		409			2,595		2		2,593
Real estate:
One-to-four family residential	701		—			172		(315		)	558		22		536
Commercial & multifamily residential:
Commercial land	4,265		—			6		(526		)	3,745		—		3,745
Income property	5,672		(223		)	141		(888		)	4,702		—		4,702
Owner occupied	5,459		—			12		(722		)	4,749		5		4,744
Real estate construction:
One-to-four family residential:
Land and acquisition	963		—			16		(67		)	912		—		912
Residential construction	3,709		—			3		924			4,636		—		4,636
Commercial & multifamily residential:
Income property	7,053		—			—		421			7,474		—		7,474
Owner occupied	4,413		—			—		(2,490		)	1,923		—		1,923
Consumer	5,163		(264		)	260		57			5,216		171		5,045
Purchased credit impaired	6,907		(1,343		)	1,224		(1,123		)	5,665		—		5,665
Unallocated	—		—			—		321			321		—		321
Total	$	75,646	$	(4,307	)	$	2,636	$	5,852		$	79,827	$	5,857	$	73,970

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2017	(in thousands)
Commercial business:
Secured	$	36,050	$	(1,109	)	$	297	$	434		$	35,672	$	—	$	35,672
Unsecured	960		(18		)	68		178			1,188		—		1,188
Real estate:
One-to-four family residential	599		(307		)	117		236			645		11		634
Commercial & multifamily residential:
Commercial land	1,797		—			—		491			2,288		—		2,288
Income property	7,342		—			35		(574		)	6,803		26		6,777
Owner occupied	6,439		—			43		52			6,534		—		6,534
Real estate construction:
One-to-four family residential:
Land and acquisition	316		(14		)	20		187			509		—		509
Residential construction	669		—			9		431			1,109		—		1,109
Commercial & multifamily residential:
Income property	404		—			—		378			782		—		782
Owner occupied	1,192		—			—		576			1,768		—		1,768
Consumer	3,534		(428		)	285		(31		)	3,360		57		3,303
Purchased credit impaired	10,515		(1,939		)	1,144		(325		)	9,395		—		9,395
Unallocated	226		—			—		742			968		—		968
Total	$	70,043	$	(3,815	)	$	2,018	$	2,775		$	71,021	$	94	$	70,927

20

Changes in the allowance for unfunded commitments and letters of credit, a component of “Other liabilities” in the Consolidated Balance Sheets, are summarized as follows:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands)
Balance at beginning of period	$	3,130	$	2,705
Net changes in the allowance for unfunded commitments and letters of credit	1,200		850
Balance at end of period	$	4,330	$	3,555

Risk Elements

The extension of credit in the form of loans or other credit products to individuals and businesses is one of our principal business activities. Our policies and applicable laws and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.

Risk ratings are reviewed and updated whenever appropriate, with more periodic reviews as the risk and dollar value of loss on the loan increases. In the event full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan.

Pass rated loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention rated loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reported as classified loans in our allowance analysis. We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. Loans risk rated as Substandard reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful rated loans have a high probability of loss; however, the amount of loss has not yet been determined. Loss rated loans are considered uncollectable and when identified, are charged off.

21

The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans, as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,067,417	$	47,672	$	151,170	$	—	$	—	$	3,266,259
Unsecured	119,416		—		663		—		—		120,079
Real estate:
One-to-four family residential	177,122		1,208		2,238		—		—		180,568
Commercial and multifamily residential:
Commercial land	279,949		1,288		8,227		—		—		289,464
Income property	1,837,613		19,863		16,698		—		—		1,874,174
Owner occupied	1,542,605		8,986		39,350		—		—		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		6,540
Residential construction	199,868		—		1,210		—		—		201,078
Commercial and multifamily residential:
Income property	303,079		—		3,058		—		—		306,137
Owner occupied	67,672		—		5,344		—		—		73,016
Consumer	314,223		—		7,853		—		—		322,076
Total	$	7,915,504	$	79,017	$	235,811	$	—	$	—	8,230,332
Less:
Allowance for loan and lease losses											74,162
Loans, excluding PCI loans, net											$	8,156,170

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,049,031	$	64,600	$	122,030	$	—	$	—	$	3,235,661
Unsecured	123,621		—		554		—		—		124,175
Real estate:
One-to-four family residential	183,312		1,186		2,056		—		—		186,554
Commercial and multifamily residential:
Commercial land	283,673		5,204		7,104		—		—		295,981
Income property	1,857,832		17,181		31,323		—		—		1,906,336
Owner occupied	1,546,775		7,380		45,831		—		—		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		25		—		—		9,907
Residential construction	187,863		—		1,828		—		—		189,691
Commercial and multifamily residential:
Income property	293,028		—		—		—		—		293,028
Owner occupied	68,393		—		4,050		—		—		72,443
Consumer	323,129		—		9,096		—		—		332,225
Total	$	7,926,539	$	95,551	$	223,897	$	—	$	—	8,245,987
Less:
Allowance for loan and lease losses											68,739
Loans, excluding PCI loans, net											$	8,177,248

22

The following is an analysis of the credit quality of our PCI loan portfolio as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
PCI loans:
Commercial business:
Secured	$	12,582	$	—	$	728	$	—	$	—	$	13,310
Unsecured	891		—		—		—		—		891
Real estate:
One-to-four family residential	11,967		—		771		—		—		12,738
Commercial and multifamily residential:
Commercial land	12,223		—		—		—		—		12,223
Income property	22,384		—		—		—		—		22,384
Owner occupied	41,874		—		919		—		—		42,793
Real estate construction:
One-to-four family residential:
Land and acquisition	164		—		7		—		—		171
Commercial and multifamily residential:
Income property	589		—		—		—		—		589
Consumer	11,514		—		475		—		—		11,989
Total	$	114,188	$	—	$	2,900	$	—	$	—	117,088
Less:
Valuation discount resulting from acquisition accounting											7,789
Allowance for loan losses											5,665
PCI loans, net											$	103,634

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
PCI loans:
Commercial business:
Secured	$	11,918	$	—	$	723	$	—	$	—	$	12,641
Unsecured	1,045		—		67		—		—		1,112
Real estate:
One-to-four family residential	13,817		—		793		—		—		14,610
Commercial and multifamily residential:
Commercial land	9,460		349		—		—		—		9,809
Income property	25,981		—		35		—		—		26,016
Owner occupied	42,617		—		769		—		—		43,386
Real estate construction:
One-to-four family residential:
Land and acquisition	169		—		8		—		—		177
Commercial and multifamily residential:
Income property	595		—		—		—		—		595
Consumer	11,705		—		707		—		—		12,412
Total	$	117,307	$	349	$	3,102	$	—	$	—	120,758
Less:
Valuation discount resulting from acquisition accounting											8,088
Allowance for loan losses											6,907
PCI loans, net											$	105,763

23

7. Other Real Estate Owned (“OREO”)

The following tables set forth activity in OREO for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance, beginning of period	$	13,298		$	5,998
Transfers in	406			—
Valuation adjustments	(92		)	(193		)
Proceeds from sale of OREO property	(2,062		)	(1,275		)
Loss on sale of OREO, net	(43		)	(11		)
Balance, end of period	$	11,507		$	4,519

At March 31, 2018, there were $433 thousand in foreclosed residential real estate properties held as OREO and the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $638 thousand.

8. Goodwill and Other Intangible Assets

In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value.

The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.

The following table sets forth activity for goodwill and other intangible assets for the periods indicated:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Goodwill
Total goodwill (1)	$	765,842		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	105,473			58,598
Accumulated amortization at beginning of period	(48,219		)	(41,886		)
Core deposit intangible, net at beginning of period	57,254			16,712
CDI current period amortization	(3,188		)	(1,349		)
Total core deposit intangible, net at end of period	54,066			15,363
Intangible assets not subject to amortization	919			919
Other intangible assets, net at end of period	54,985			16,282
Total goodwill and other intangible assets at end of period	$	820,827		$	399,044

__________

(1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.

24

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2018 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2018	$	9,048
2019	10,479
2020	8,724
2021	7,264
2022	5,880

9. Subordinated Debentures

On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $35.0 million in aggregate principal amount of fixed-to-floating rate subordinated debentures (the “Notes”). The Notes are callable at par on June 30, 2021, have a stated maturity of June 30, 2026 and bear interest at a fixed annual rate of 5.875% per year, from and including June 27, 2016, but excluding June 30, 2021. From and including June 30, 2021 through the maturity date or early redemption date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR plus 471.5 basis points.

10. Junior Subordinated Debentures

On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $14.4 million of trust preferred obligations. The Company redeemed $6.2 million of these obligations during 2017. The remaining $8.2 million of obligations were redeemed in January 2018.

11. Derivatives and Balance Sheet Offsetting

The Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third-party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at March 31, 2018 and December 31, 2017 was $393.8 million and $384.7 million, respectively. During the three months ended March 31, 2018 and March 31, 2017, mark-to-market gains of $6 thousand and $4 thousand, respectively, were recorded to “Other” noninterest expense.

The following table presents the fair value of derivatives not designated as hedging instruments at March 31, 2018 and December 31, 2017:

Asset Derivatives

Liability Derivatives

March 31, 2018

December 31, 2017

March 31, 2018

December 31, 2017

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

(in thousands)

Interest rate contracts

Other assets

$

7,406

Other assets

$

6,707

Other liabilities

$

7,409

Other liabilities

$

6,714

25

The Company is party to interest rate contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.

	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Collateral Posted			Net Amount
March 31, 2018	(in thousands)
Assets
Interest rate contracts	$	7,406	$	—	$	7,406	$	—		$	7,406
Liabilities
Interest rate contracts	$	7,409	$	—	$	7,409	$	(1,190	)	$	6,219
Repurchase agreements	$	24,247	$	—	$	24,247	$	(24,247	)	$	—
December 31, 2017
Assets
Interest rate contracts	$	6,707	$	—	$	6,707	$	—		$	6,707
Liabilities
Interest rate contracts	$	6,714	$	—	$	6,714	$	(6,714	)	$	—
Repurchase agreements	$	79,059	$	—	$	79,059	$	(79,059	)	$	—

The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:

	Remaining contractual maturity of the agreements
	Overnight and continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
March 31, 2018	(in thousands)
Class of collateral pledged for repurchase agreements
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	24,247	$	—	$	—	$	—	$	24,247
Gross amount of recognized liabilities for repurchase agreements									24,247
Amounts related to agreements not included in offsetting disclosure									$	—

The collateral utilized for the Company’s repurchase agreements is subject to market fluctuations as well as prepayments of principal. The Company monitors the risk of the fair value of its pledged collateral falling below acceptable amounts based on the type of the underlying repurchase agreement. The pledged collateral related to the Company’s $24.2 million sweep repurchase agreements, which mature on an overnight basis, is monitored on a daily basis as the underlying sweep accounts can have frequent transaction activity and the amount of pledged collateral is adjusted as necessary.

12. Commitments and Contingent Liabilities

Lease Commitments: The Company’s lease commitments consist primarily of leased locations under various non-cancellable operating leases that expire between 2018 and 2043. The majority of the leases contain renewal options and provisions for increases in rental rates based on an agreed upon index or predetermined escalation schedule.

Financial Instruments with Off-Balance Sheet Risk: In the normal course of business, the Company makes loan commitments (typically unfunded loans and unused lines of credit) and issues standby letters of credit to accommodate the financial needs of its customers. At March 31, 2018 and December 31, 2017, the Company’s loan commitments amounted to $2.58 billion and $2.62 billion, respectively.

26

Standby letters of credit commit the Company to make payments on behalf of customers under specified conditions. Historically, no significant losses have been incurred by the Company under standby letters of credit. Both arrangements have credit risk essentially the same as that involved in extending loans to customers and are subject to the Company’s normal credit policies, including collateral requirements, where appropriate. Standby letters of credit were $41.9 million and $51.3 million at March 31, 2018 and December 31, 2017, respectively. In addition, commitments under commercial letters of credit used to facilitate customers’ trade transactions and other off-balance sheet liabilities amounted to $58 thousand and $159 thousand at March 31, 2018 and December 31, 2017, respectively.

Legal Proceedings: The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from their regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.

13. Shareholders’ Equity

Dividends: On January 25, 2018, the Company declared a quarterly cash dividend of $0.22 per common share payable on February 21, 2018 to shareholders of record at the close of business on February 7, 2018.

Subsequent to quarter end, on April 25, 2018, the Company declared a regular quarterly cash dividend of $0.26 per common share payable on May 23, 2018 to shareholders of record at the close of business on May 9, 2018.

The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.

14. Accumulated Other Comprehensive Loss

The following table shows changes in accumulated other comprehensive income (loss) by component for the three month periods ended March 31, 2018 and 2017:

	Unrealized Gains and Losses on Available-for-Sale Securities (1)			Unrealized Gains and Losses on Pension Plan Liability (1)			Total (1)
Three months ended March 31, 2018	(in thousands)
Beginning balance	$	(19,779	)	$	(2,446	)	$	(22,225	)
Adjustment pursuant to adoption of ASU 2016-01	157			—			157
Other comprehensive loss before reclassifications	(26,048		)	—			(26,048		)
Amounts reclassified from accumulated other comprehensive loss	(78		)	61			(17		)
Net current-period other comprehensive income (loss)	(26,126		)	61			(26,065		)
Ending balance	$	(45,748	)	$	(2,385	)	$	(48,133	)
Three months ended March 31, 2017
Beginning balance	$	(12,704	)	$	(6,295	)	$	(18,999	)
Other comprehensive income before reclassifications	1,702			4,604			6,306
Amounts reclassified from accumulated other comprehensive income	—			87			87
Net current-period other comprehensive income	1,702			4,691			6,393
Ending balance	$	(11,002	)	$	(1,604	)	$	(12,606	)

__________

(1) All amounts are net of tax. Amounts in parenthesis indicate debits.

27

The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the three month periods ended March 31, 2018 and 2017:

	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
	Three Months Ended March 31,						Affected line Item in the Consolidated
	2018			2017			Statement of Income
	(in thousands)
Unrealized gains and losses on available-for-sale securities
Investment securities gains	$	102		$	—		Investment securities gains, net
	102			—			Total before tax
	(24		)	—			Income tax provision
	$	78		$	—		Net of tax
Amortization of pension plan liability
Actuarial losses	$	(80	)	$	(136	)	Compensation and employee benefits
	(80		)	(136		)	Total before tax
	19			49			Income tax benefit
	$	(61	)	$	(87	)	Net of tax

15. Fair Value Accounting and Measurement

The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available.

The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy:

Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date.

Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable.

Fair values are determined as follows:

Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury Notes and equity securities, which are considered a Level 1 input method.

Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy.

28

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2018 and December 31, 2017 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
March 31, 2018	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,645,218	$	—	$	1,645,218	$	—
State and municipal debt securities	582,748		—		582,748		—
U.S. government agency and government-sponsored enterprise securities	395,832		—		395,832		—
U.S. government securities	247		247		—		—
Total debt securities available for sale	$	2,624,045	$	247	$	2,623,798	$	—
Equity securities	$	5,000	$	5,000	$	—	$	—
Other assets (Interest rate contracts)	$	7,406	$	—	$	7,406	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	7,409	$	—	$	7,409	$	—

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
December 31, 2017	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,726,725	$	—	$	1,726,725	$	—
State and municipal debt securities	596,004		—		596,004		—
U.S. government agency and government-sponsored enterprise securities	414,774		—		414,774		—
U.S. government securities	248		248		—		—
Total debt securities available for sale	$	2,737,751	$	248	$	2,737,503	$	—
Equity securities	$	5,080	$	5,080	$	—	$	—
Other assets (Interest rate contracts)	$	6,707	$	—	$	6,707	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	6,714	$	—	$	6,714	$	—

There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the three month periods ended March 31, 2018 and 2017. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.

29

Nonrecurring Measurements

Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:

Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the allowance process on a quarterly basis by officers in the Special Credits group, which reports to the Chief Credit Officer. The Real Estate Appraisal Services Department (“REASD”), which also reports to the Chief Credit Officer, is responsible for obtaining appraisals from third-parties or performing internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy and reasonableness.

Other real estate owned—OREO is real property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO is generally measured based on the property’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO is initially recorded at the fair value less estimated costs to sell. This amount becomes the property’s new basis. Any fair value adjustments based on the property’s fair value less estimated costs to sell at the date of acquisition are charged to the allowance, or in the event of a write-up without previous losses charged to the allowance, a credit to earnings is recorded. Management periodically reviews OREO in an effort to ensure the property is recorded at its fair value, net of estimated costs to sell. Any fair value adjustments subsequent to acquisition are charged or credited to earnings. The initial and subsequent evaluations are performed by officers in the Special Credits group, which reports to the Chief Credit Officer. The REASD obtains appraisals from third-parties for OREO and performs internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy and reasonableness.

The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:

	Fair value at March 31, 2018		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2018
			Level 1		Level 2		Level 3
	(in thousands)
Impaired loans	$	7,820	$	—	$	—	$	7,820	$	5,058
OREO	160		—		—		160		51
	$	7,980	$	—	$	—	$	7,980	$	5,109

	Fair value at March 31, 2017		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2017
			Level 1		Level 2		Level 3
	(in thousands)
OREO	$	1,260	$	—	$	—	$	1,260	$	193
	$	1,260	$	—	$	—	$	1,260	$	193

The losses on impaired loans disclosed above represent the amount of the specific reserve and/or charge-offs during the period applicable to loans held at period end. The amount of the specific reserve is included in the allowance for loan and lease losses. The losses on OREO disclosed above represent the write-downs taken at foreclosure that were charged to the allowance for loan and lease losses, as well as subsequent changes in any valuation allowances from updated appraisals that were recorded to earnings.

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Quantitative information about Level 3 fair value measurements

The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table:

	Fair value at March 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - collateral-dependent (3)	$	7,512	Fair Market Value of Collateral	Adjustment to Stated Value	0.00% - 100.00% (41.33%)
Impaired loans - other (4)	$	308	Discounted Cash Flow	Discount Rate	6.00%
OREO	$	160	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount rate applied to discounted cash flow valuation or appraisal value and stated value (in the case of accounts receivable, fixed assets, and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values during the current period.
(3) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.
(4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided.

	Fair value at March 31, 2017		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
OREO	$	1,260	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value.
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values.

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The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at March 31, 2018 and December 31, 2017:

	March 31, 2018
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	206,532	$	206,532	$	206,532	$	—	$	—
Interest-earning deposits with banks	87,124		87,124		87,124		—		—
Debt securities available for sale	2,624,045		2,624,045		247		2,623,798		—
Equity securities	5,000		5,000		5,000		—		—
FHLB stock	11,640		11,640		—		11,640		—
Loans held for sale	4,312		4,312		—		4,312		—
Loans	8,259,804		8,281,010		—		—		8,281,010
Interest rate contracts	7,406		7,406		—		7,406		—
Liabilities
Deposits	$	474,000	$	465,896	$	—	$	465,896	$	—
FHLB advances	41,564		42,090		—		42,090		—
Repurchase agreements	24,247		24,247		—		24,247		—
Subordinated debentures	35,601		35,486		—		35,486		—
Interest rate contracts	7,409		7,409		—		7,409		—

	December 31, 2017
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	244,615	$	244,615	$	244,615	$	—	$	—
Interest-earning deposits with banks	97,918		97,918		97,918		—		—
Debt securities available for sale	2,737,751		2,737,751		248		2,737,503		—
Equity securities	5,080		5,080		5,080		—		—
FHLB stock	10,440		10,440		—		10,440		—
Loans held for sale	5,766		5,766		—		5,766		—
Loans	8,283,011		8,055,817		—		—		8,055,817
Interest rate contracts	6,707		6,707		—		6,707		—
Liabilities
Deposits	$	10,532,085	$	10,524,135	$	10,041,040	$	483,095	$	—
FHLB advances	11,579		12,281		—		12,281		—
Repurchase agreements	79,059		79,070		—		79,070		—
Subordinated debentures	35,647		35,895		—		35,895		—
Junior subordinated debentures	8,248		8,248		—		8,248		—
Interest rate contracts	6,714		6,714		—		6,714		—

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16. Earnings per Common Share

The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company issues restricted shares under share-based compensation plans and preferred shares which qualify as participating securities.

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands except per share)
Basic EPS:
Net income	$	39,970	$	29,199
Less: Earnings allocated to participating securities:
Preferred shares	—		3
Nonvested restricted shares	437		397
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Basic earnings per common share	$	0.55	$	0.50
Diluted EPS:
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Dilutive effect of equity awards	5		6
Weighted average diluted common shares outstanding	72,305		57,394
Diluted earnings per common share	$	0.55	$	0.50
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive	12		14

17. Revenue from Contracts with Customers

Revenue in the scope of Topic 606, Revenue from Contracts with Customers is measured based on the consideration specified in the contract with a customer and excludes amounts collected on behalf of third parties. The vast majority of the Company’s revenue is specifically out of scope of Topic 606. For in-scope revenue, the following is a description of principal activities, separated by the timing of revenue recognition from which the Company generates its revenue from contracts with customers.

a. Revenue earned at a point in time - Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, overdraft fees, interchange fees and foreign exchange transaction fees. Revenue is primarily based on the number and type of transactions and is generally derived from transactional information accumulated by our systems and is recognized immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal.

b. Revenue earned over time - The Company earns revenue from contracts with customers in a variety of ways where the revenue is earned over a period of time - generally monthly. Examples of this type of revenue are deposit account maintenance fees, investment advisory fees, merchant revenue and safe deposit box fees. Revenue is generally derived from transactional information accumulated by our systems or those of third-parties and is recognized as the related transactions occur or services are rendered to the customer.

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The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered and our contracts generally do not include multiple performance obligations. As a result, there are no contract balances as payments and services are rendered simultaneously. Payment is generally collected at the time services are rendered, monthly or quarterly. Unsatisfied performance obligations at the report date are not material to our consolidated financial statements.

In certain cases, other parties are involved with providing products and services to our customers. If the Company is principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue.

Rebates, waivers and reversals are recorded as a reduction of the transaction price either when the revenue is recognized by the Company or at the time the rebate, waiver or reversal is earned by the customer.

Practical expedients

The Company applies the practical expedient in paragraph 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service will be one year or less.

The Company pays sales commissions to its employees in accordance with certain incentive plans and in connection with obtaining certain contracts with customer. The Company applies the practical expedient in paragraph 340-40-25-4 and expenses such sales commissions when incurred if the amortization period of the asset the Company otherwise would have recognized is one year or less. Sales commissions are included in compensation and employee benefits expense.

For the Company’s contracts that have an original expected duration of one year or less, the Company uses the practical expedient in paragraph 606-10-50-14 and has not disclosed the amount of the transaction price allocated to unsatisfied performance obligations as of the end of each reporting period or when the Company expects to recognize this revenue.

Disaggregation of revenue

The following table shows the disaggregation of revenue from contracts with customers for the three month period ended March 31, 2018:

	Three Months Ended March 31, 2018
	(dollars in thousands)
Noninterest income:
Revenue from contracts with customers:
Deposit account and treasury management fees	$	8,740
Card revenue	5,813
Financial services and trust revenue	2,730
Total revenue from contracts with customers	17,283
Other sources of noninterest income	5,860
Total noninterest income	$	23,143

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This discussion should be read in conjunction with the unaudited Consolidated Financial Statements of Columbia Banking System, Inc. (referred to in this report as “we”, “our”, “Columbia” and “the Company”) and notes thereto presented elsewhere in this report and with the December 31, 2017 audited Consolidated Financial Statements and its accompanying notes included in our Annual Report on Form 10-K. In the following discussion, unless otherwise noted, references to increases or decreases in average balances in items of income and expense for a particular period and balances at a particular date refer to the comparison with corresponding amounts for the period or date one year earlier.

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This quarterly report on Form 10-Q may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements about our plans, objectives, expectations and intentions that are not historical facts, and statements identified by words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “should,” “projects,” “seeks,” “estimates” or the negative version of those words or other comparable words or phrases of a future or forward-looking nature. Forward-looking statements are based on current beliefs and expectations of management and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. In addition to the factors set forth in the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in this report and the factors set forth in the section titled “Risk Factors” in the Company’s Form 10-K, the following factors, among others, could cause actual results to differ materially from the anticipated results expressed or implied by forward-looking statements:

• national and global economic conditions could be less favorable than expected or could have a more direct and pronounced effect on us than expected and adversely affect our ability to continue internal growth and maintain the quality of our earning assets;

• the housing markets where we operate and make loans could face challenges;

• the risks presented by the economy, which could adversely affect credit quality, collateral values, including real estate collateral, investment values, liquidity and loan originations and loan portfolio delinquency rates;

• the efficiencies and enhanced financial and operating performance we expect to realize from investments in personnel, acquisitions (including the acquisition of Pacific Continental Corporation (“Pacific Continental”)), and infrastructure may not be realized;

• the ability to successfully integrate Pacific Continental, or to integrate future acquired entities;

• interest rate changes could significantly reduce net interest income and negatively affect funding sources;

• projected business increases following strategic expansion could be lower than expected;

• changes in the scope and cost of Federal Deposit Insurance Corporation (“FDIC”) insurance and other coverages;

• the impact of acquired loans on our earnings;

• changes in accounting principles, policies and guidelines applicable to bank holding companies and banking;

• changes in laws and regulations affecting our businesses, including changes in the enforcement and interpretation of such laws and regulations by applicable governmental and regulatory agencies;

• competition among financial institutions and nontraditional providers of financial services could increase significantly;

• continued consolidation in the Northwest financial services industry resulting in the creation of larger financial institutions that may have greater resources could change the competitive landscape;

• the goodwill we have recorded in connection with acquisitions could become impaired, which may have an adverse impact on our earnings and capital;

• our ability to identify and address cyber-security risks, including security breaches, “denial of service attacks,” “hacking” and identity theft;

• any material failure or interruption of our information and communications systems or inability to keep pace with technological changes;

• our ability to effectively manage credit risk, interest rate risk, market risk, operational risk, legal risk, liquidity risk and regulatory and compliance risk;

• the effect of geopolitical instability, including wars, conflicts and terrorist attacks;

• our profitability measures could be adversely affected if we are unable to effectively manage our capital;

• natural disasters, including earthquakes, tsunamis, flooding, fires and other unexpected events; and

• the effects of any damage to our reputation resulting from developments related to any of the items identified above.

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You should take into account that forward-looking statements speak only as of the date of this report. Given the described uncertainties and risks, we cannot guarantee our future performance or results of operations and you should not place undue reliance on forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required under federal securities laws.

CRITICAL ACCOUNTING POLICIES

Management has identified the accounting policies related to the allowance for loan and lease losses (the “allowance”), business combinations and the valuation and recoverability of goodwill as critical to an understanding of our financial statements. These policies and related estimates are discussed in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” under the headings “Allowance for Loan and Lease Losses,” “Business Combinations” and “Valuation and Recoverability of Goodwill” in our 2017 Annual Report on Form 10-K. There have not been any material changes in our critical accounting policies as compared to those disclosed in our 2017 Annual Report on Form 10-K.

RESULTS OF OPERATIONS

Our results of operations are dependent to a large degree on our net interest income. We also generate noninterest income from our broad range of products and services including treasury management, wealth management and debit and credit cards. Our operating expenses consist primarily of compensation and employee benefits, occupancy, data processing and legal and professional fees. Like most financial institutions, our interest income and cost of funds are affected significantly by general economic conditions, particularly changes in market interest rates, and by government policies and actions of regulatory authorities.

Earnings Summary

The Company reported net income for the first quarter of $40.0 million or $0.55 per diluted common share, compared to $29.2 million or $0.50 per diluted common share for the first quarter of 2017. Net interest income for the three months ended March 31, 2018 was $115.5 million, an increase of $28.8 million from the prior year period. The increase was a result of higher interest income on loans primarily due to higher loan volumes from our acquisition of Pacific Continental. Noninterest income for the current quarter was $23.1 million, a decrease of $1.7 million from the prior year period. The decrease was primarily due to a BOLI benefit of $1.5 million recorded in the prior year, with no such BOLI benefit in the current period.

The provision for loan and lease losses for the first quarter of 2018 was $5.9 million compared to a provision of $2.8 million during the first quarter of 2017. The provision expense recorded in the first quarter of 2018 reflected a $7.0 million provision for loans, excluding PCI loans, and a $1.1 million provision recapture from PCI loans.

Total noninterest expense for the quarter ended March 31, 2018 was $86.0 million, an increase from $69.0 million for the first quarter of 2017. The increase from the prior year period was primarily due to due to higher compensation and benefits expense in the current quarter as a result of the recent Pacific Continental acquisition as well as $2.9 million higher acquisition-related expenses, partially offset by a decrease in merchant processing expense.

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Net Interest Income

The following table sets forth the average balances of all major categories of interest-earning assets and interest-bearing liabilities, the total dollar amounts of interest income on interest-earning assets and interest expense on interest-bearing liabilities, the average yield earned on interest-earning assets and average cost of interest-bearing liabilities by category and, in total, net interest income and net interest margin:

	Three Months Ended March 31,						Three Months Ended March 31,
	2018						2017
	Average Balances		Interest Earned / Paid		Average Rate		Average Balances		Interest Earned / Paid		Average Rate
	(dollars in thousands)
ASSETS
Loans, net (1)(2)	$	8,348,740	$	104,091	4.99	%	$	6,198,215	$	75,514	4.87	%
Taxable securities	2,158,039		12,708		2.36	%	1,861,627		10,986		2.36	%
Tax exempt securities (2)	524,211		3,878		2.96	%	448,863		4,140		3.69	%
Interest-earning deposits with banks	91,763		345		1.50	%	11,586		19		0.66	%
Total interest-earning assets	11,122,753		$	121,022	4.35	%	8,520,291		$	90,659	4.26	%
Other earning assets	218,126						178,091
Noninterest-earning assets	1,262,265						775,316
Total assets	$	12,603,144					$	9,473,698
LIABILITIES AND SHAREHOLDERS’ EQUITY
Certificates of deposit	$	479,729	$	526	0.44	%	$	399,306	$	95	0.10	%
Savings accounts	878,170		41		0.02	%	738,631		19		0.01	%
Interest-bearing demand	1,252,823		535		0.17	%	972,560		159		0.07	%
Money market accounts	2,795,008		1,407		0.20	%	2,008,107		514		0.10	%
Total interest-bearing deposits	5,405,730		2,509		0.19	%	4,118,604		787		0.08	%
Federal Home Loan Bank advances	125,660		570		1.81	%	81,577		225		1.10	%
Subordinated debentures	35,623		468		5.26	%	—		—		—	%
Other borrowings and interest-bearing liabilities	60,840		116		0.76	%	63,479		129		0.81	%
Total interest-bearing liabilities	5,627,853		$	3,663	0.26	%	4,263,660		$	1,141	0.11	%
Noninterest-bearing deposits	4,928,750						3,836,049
Other noninterest-bearing liabilities	97,266						112,337
Shareholders’ equity	1,949,275						1,261,652
Total liabilities & shareholders’ equity	$	12,603,144					$	9,473,698
Net interest income (tax equivalent)			$	117,359					$	89,518
Net interest margin (tax equivalent)					4.22	%					4.20	%

__________

(1) Nonaccrual loans have been included in the tables as loans carrying a zero yield. Amortized net deferred loan fees and net unearned discounts on acquired loans were included in the interest income calculations. The amortization of net deferred loan fees was $2.2 million and $1.6 million for the three month periods ended March 31, 2018 and 2017, respectively. The incremental accretion income on acquired loans was $3.7 million and $4.1 million for the three months ended March 31, 2018 and 2017, respectively.

(2) Tax-exempt income is calculated on a tax equivalent basis at a rate of 21% for 2018 and 35% for 2017. The tax equivalent yield adjustment to interest earned on loans was $1.1 million and $1.4 million for the three months ended March 31, 2018 and 2017, respectively. The tax equivalent yield adjustment to interest earned on tax exempt securities was $814 thousand and $1.4 million for the three month periods ended March 31, 2018 and 2017, respectively.

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The following table sets forth the total dollar amount of change in interest income and interest expense. The changes have been segregated for each major category of interest-earning assets and interest-bearing liabilities into amounts attributable to changes in volume and changes in rates. Changes attributable to the combined effect of volume and interest rates have been allocated proportionately to the changes due to volume and the changes due to interest rates:

	Three Months Ended March 31, 2018 Compared to 2017 Increase (Decrease) Due to
	Volume			Rate			Total
	(in thousands)
Interest Income
Loans, net (1)	$	26,774		$	1,803		$	28,577
Taxable securities	1,745			(23		)	1,722
Tax exempt securities (1)	632			(894		)	(262		)
Interest earning deposits with banks	275			51			326
Interest income	$	29,426		$	937		$	30,363
Interest Expense
Deposits:
Certificates of deposit	$	23		$	408		$	431
Savings accounts	4			18			22
Interest-bearing demand	57			319			376
Money market accounts	257			636			893
Total interest on deposits	341			1,381			1,722
Federal Home Loan Bank advances	157			188			345
Subordinated debentures	468			—			468
Other borrowings and interest-bearing liabilities	(5		)	(8		)	(13		)
Interest expense	$	961		$	1,561		$	2,522

__________

(1) For tax exempt loans and tax exempt securities, the amount of our tax equivalent adjustment for 2018 was impacted by the lower federal corporate tax rate. As a result, our tax equivalent adjustments for tax exempt loans and tax exempt securities were $1.1 million and $836 thousand lower, respectively, than they would have been utilizing the prior federal corporate tax rate. This change in federal corporate tax rate negatively impacted our current quarter net interest margin (tax equivalent) by 7 basis points.

The following table shows the impact to interest income of incremental accretion income as well as the net interest margin and operating net interest margin for the periods presented:

	Three Months Ended March 31,
	2018			2017
	(dollars in thousands)
Incremental accretion income due to:
FDIC purchased credit impaired loans	$	329		$	2,117
Other acquired loans	3,370			1,948
Incremental accretion income	$	3,699		$	4,065
Net interest margin (tax equivalent)	4.22		%	4.20		%
Operating net interest margin(tax equivalent) (1)	4.18		%	4.09		%

__________

(1) Operating net interest margin (tax equivalent) is a non-GAAP measurement. See Non-GAAP measures section of Item 2, Management’s Discussion and Analysis.

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Net interest income for the first quarter of 2018 was $115.5 million, up from $86.7 million for the same quarter in 2017. The increase was primarily due to higher average earning asset volumes stemming from the Pacific Continental acquisition. The loan yield for the first quarter of 2018 was 4.99% compared to 4.87% for the prior year period. The increased loan yield reflected increases in short term rates since the prior year period as well as yields on newly originated loans being higher overall than the average portfolio yield.

The Company’s net interest margin (tax equivalent) increased to 4.22% in the first quarter of 2018, from 4.20% for the prior year period. This increase was due to higher loan yields as described above. The Company’s operating net interest margin (tax equivalent) (see footnote 1 in prior table) increased to 4.18% from 4.09% due to higher loan and security volumes from our acquisition of Pacific Continental.

Provision for Loan and Lease Losses

During the first quarter of 2018, the Company recorded a $5.9 million net provision compared to a $2.8 million net provision during the first quarter of 2017. The $5.9 million net provision for loan and lease losses recorded during the current quarter was due to a provision recapture of $1.1 million for PCI loans and provision expense of $7.0 million for loans, excluding PCI loans. The $7.0 million provision for loans, excluding PCI loans, was due to weakness in certain loans within our agricultural loan portfolio and net charge-off activity. The provision recapture recorded relating to PCI loans was due to the increase in the present value of expected future cash flows as remeasured during the current quarter, compared to the present value of expected future cash flows measured during the fourth quarter of 2017. The amount of provision was calculated in accordance with the Company’s methodology for determining the allowance, discussed in Note 6 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.

Noninterest Income

The following table presents the significant components of noninterest income and the related dollar and percentage change from period to period:

	Three Months Ended March 31,
	2018		2017			$ Change			% Change
	(dollars in thousands)
Deposit account and treasury management fees	$	8,740	$	7,287		$	1,453		20	%
Card revenue (1)	5,813		5,723			90			2	%
Financial services and trust revenue	2,730		2,839			(109		)	(4	)%
Loan revenue	3,186		3,593			(407		)	(11	)%
Merchant processing revenue	—		2,019			(2,019		)	(100	)%
Bank owned life insurance	1,426		1,280			146			11	%
Investment securities gains, net	22		—			22			100	%
Change in FDIC loss-sharing asset	—		(274		)	274			(100	)%
Other	1,226		2,392			(1,166		)	(49	)%
Total noninterest income	$	23,143	$	24,859		$	(1,716	)	(7	)%

__________

(1) Beginning in the first quarter of 2018 and pursuant to the adoption of new revenue recognition accounting guidance, interchange revenue, included in “Card revenue” above, is presented net of related payment card network expenses. For the three months ended March 31, 2018, $1.3 million of such expenses were netted from “Card revenue”.

Noninterest income was $23.1 million for the first quarter of 2018, compared to $24.9 million for the same period in 2017. The decrease was primarily due to the sale of the merchant card services portfolio in the second quarter of 2017. As a result of that sale, we now share with the buyer in merchant services revenue and include such amounts in “Card revenue.” For the current quarter, this net revenue share was $699 thousand. The decrease in other noninterest income was due to a BOLI benefit of $1.5 million recorded in the prior year, with no such BOLI benefit in the current period.

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Noninterest Expense

The following table presents the significant components of noninterest expense and the related dollar and percentage change from period to period:

	Three Months Ended March 31,
	2018		2017		$ Change			% Change
	(dollars in thousands)
Compensation and employee benefits	$	50,570	$	40,825	$	9,745		24	%
Occupancy	10,121		7,191		2,930			41	%
Merchant processing expense	—		1,049		(1,049		)	(100	)%
Advertising and promotion	1,429		817		612			75	%
Data processing	5,270		4,208		1,062			25	%
Legal and professional services	3,237		3,369		(132		)	(4	)%
Taxes, license and fees	1,425		1,241		184			15	%
Regulatory premiums	937		776		161			21	%
Net cost of operation of other real estate owned	1		152		(151		)	(99	)%
Amortization of intangibles	3,188		1,349		1,839			136	%
Other (1)	9,809		8,009		1,800			22	%
Total noninterest expense	$	85,987	$	68,986	$	17,001		25	%

__________

(1) In the first quarter of 2018, there was a change to net presentation of interchange revenue pursuant to the adoption of new revenue recognition accounting guidance on January 1, 2018. As a result, $1.3 million of payment card network expenses that would have historically been presented in other noninterest expense are now presented in card revenue.

The following table shows the impact of the acquisition-related expenses for the periods indicated to the various components of noninterest expense:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands)
Acquisition-related expenses:
Compensation and employee benefits	$	1,556	$	—
Occupancy	1,004		1
Advertising and promotion	512		6
Data processing	287		—
Legal and professional fees	574		1,311
Other	332		46
Total impact of acquisition-related expense to noninterest expense	$	4,265	$	1,364

Total noninterest expense for the first quarter of 2018 was $86.0 million, an increase of $17.0 million from the prior year period. The increase was due to higher compensation and benefits expense in the current quarter as a result of the recent Pacific Continental acquisition as well as $2.9 million higher acquisition-related expenses, partially offset by a decrease in merchant processing expenses stemming from the sale of our merchant card services portfolio in the second quarter of 2017.

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Income Taxes

We recorded an income tax provision of $6.8 million for the first quarter of 2018, compared to a provision of $10.6 million for the same period in 2017, with effective tax rates of 15% for the first quarter of 2018 and 27% for the same period in 2017. The decrease in our effective tax rate was principally attributable to the enactment of the Tax Cuts and Jobs Act on December 22, 2017, which reduced the federal corporate tax rate to 21%. The prior year period’s effective tax rate reflected the then-enacted 35% corporate tax rate reduced by favorable tax attributes of certain earning assets and discrete tax benefits from share-based compensation. Our effective tax rate remains lower than the statutory tax rate due to tax-exempt income from municipal securities, bank owned life insurance and certain loan receivables. In addition, the current period’s rate reflects the tax benefit of discrete items such as share-based compensation. For additional information, please refer to the Company’s annual report on Form 10-K for the year ended December 31, 2017.

FINANCIAL CONDITION

Total assets were $12.53 billion at March 31, 2018, a decrease of $186.3 million from $12.72 billion at December 31, 2017. Cash and cash equivalents decreased$48.9 million. Loans decreased $19.0 million during the current quarter primarily the result of seasonally low loan production and line utilization. Debt securities available for sale were $2.62 billion at March 31, 2018, a decrease of $113.7 million from December 31, 2017. Total liabilities were $10.58 billion as of March 31, 2018, a decrease of $184.3 million from $10.77 billion at December 31, 2017. The decline was primarily due to decreased deposits.

Investment Securities

At March 31, 2018, the Company’s investment portfolio primarily consisted of debt securities available for sale totaling $2.62 billion compared to $2.74 billion at December 31, 2017. The decrease in the debt securities portfolio from year-end is due to $102.3 million in maturities, repayments and sales, a $34.0 million increase in net unrealized loss, and $4.9 million in premium amortization partially offset by $27.5 million in purchases. The average duration of our debt securities investment portfolio was approximately 3 years and 11 months at March 31, 2018. This duration takes into account calls, where appropriate, and consensus prepayment speeds.

The investment securities are used by the Company as a component of its balance sheet management strategies. From time-to-time, securities may be sold to reposition the portfolio in response to strategies developed by the Company’s asset liability management committee. In accordance with our investment strategy, management monitors market conditions with a view to realize gains on its available for sale securities portfolio when prudent.

The Company performs a quarterly assessment of the debt securities available for sale in its investment portfolio that have an unrealized loss to determine whether the decline in the fair value of these securities below their amortized cost basis is other-than-temporary. Impairment is considered other-than-temporary when it becomes probable that the Company will be unable to recover the entire amortized cost basis of its investment. The Company’s impairment assessment takes into consideration factors such as the length of time and the extent to which the market value has been less than cost, defaults or deferrals of scheduled interest or principal, external credit ratings and recent downgrades, internal assessment of credit quality, and whether the Company intends to sell the security and whether it is more likely than not it will be required to sell the security prior to recovery of its amortized cost basis. If a decline in fair value is judged to be other-than-temporary, the cost basis of the individual security is written down to fair value which then becomes the new cost basis. The new cost basis is not adjusted for subsequent recoveries in fair value.

When there are credit losses associated with an impaired debt security and the Company does not have the intent to sell the security and it is more likely than not that it will not have to sell the security before recovery of its cost basis, the Company will separate the amount of the impairment into the amount that is credit-related and the amount related to non-credit factors. The credit-related impairment is recognized in earnings and the non-credit-related impairment is recognized in accumulated other comprehensive income.

At March 31, 2018, the market value of debt securities available for sale had a net unrealized loss of $59.6 million compared to a net unrealized loss of $25.6 million at December 31, 2017. The change in valuation was the result of fluctuations in market interest rates subsequent to purchase. At March 31, 2018, the Company had $2.39 billion of debt securities available for sale with gross unrealized losses of $63.8 million; however, we did not consider these investment securities to be other-than-temporarily impaired.

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The following table sets forth our securities portfolio by type for the dates indicated:

	March 31, 2018		December 31, 2017
	(in thousands)
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,645,218	$	1,726,725
State and municipal securities	582,748		596,004
U.S. government agency and government-sponsored enterprise securities	395,832		414,774
U.S. government securities	247		248
Total debt securities available for sale	$	2,624,045	$	2,737,751
Equity securities	5,000		5,080
Total investment securities	$	2,629,045	$	2,742,831

For further information on our investment portfolio, see Note 4 of the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.

Credit Risk Management

The extension of credit in the form of loans or other credit substitutes to individuals and businesses is one of our principal commerce activities. Our policies, applicable laws, and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies, and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.

In analyzing our existing portfolio, we review our consumer and residential loan portfolios by their performance as a pool of loans, since no single loan is individually significant or judged by its risk rating, size or potential risk of loss. In contrast, the monitoring process for the commercial business, real estate construction, and commercial real estate portfolios includes periodic reviews of individual loans with risk ratings assigned to each loan and performance judged on a loan-by-loan basis.

We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. In the event that full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan. For additional discussion on our methodology in managing credit risk within our loan portfolio, see the “Allowance for Loan and Lease Losses” section in this Management’s Discussion and Analysis and Note 1 to the Consolidated Financial Statements in “Item 8. Financial Statements and Supplementary Data” of the Company’s 2017 Annual Report on Form 10-K.

Loan policies, credit quality criteria, portfolio guidelines and other controls are established under the guidance of our Chief Credit Officer and approved, as appropriate, by the Board of Directors. Credit Administration, together with the management loan committee, has the responsibility for administering the credit approval process. As another part of its control process, we use an internal credit review and examination function to provide reasonable assurance that loans and commitments are made and maintained as prescribed by our credit policies. This includes a review of documentation when the loan is initially extended and subsequent examination to ensure continued performance and proper risk assessment.

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Loan Portfolio Analysis

Our wholly owned banking subsidiary Columbia State Bank is a full service commercial bank, which originates a wide variety of loans, and focuses its lending efforts on originating commercial business and commercial real estate loans.

The following table sets forth the Company’s loan portfolio by type of loan for the dates indicated:

	March 31, 2018			% of Total		December 31, 2017			% of Total
	(dollars in thousands)
Commercial business	$	3,402,162		40.8	%	$	3,377,324		40.4	%
Real estate:
One-to-four family residential	182,302			2.2	%	188,396			2.3	%
Commercial and multifamily residential	3,776,709			45.3	%	3,825,739			45.8	%
Total real estate	3,959,011			47.5	%	4,014,135			48.1	%
Real estate construction:
One-to-four family residential	208,441			2.5	%	200,518			2.4	%
Commercial and multifamily residential	385,339			4.6	%	371,931			4.4	%
Total real estate construction	593,780			7.1	%	572,449			6.8	%
Consumer	323,631			3.9	%	334,190			4.0	%
Purchased credit impaired	109,299			1.3	%	112,670			1.3	%
Subtotal	8,387,883			100.6	%	8,410,768			100.6	%
Less: Net unearned income	(48,252		)	(0.6	)%	(52,111		)	(0.6	)%
Loans, net of unearned income (before Allowance for Loan and Lease Losses)	$	8,339,631		100.0	%	$	8,358,657		100.0	%
Loans held for sale	$	4,312				$	5,766

Total loans decreased$19.0 million from year-end 2017 primarily the result of seasonally low loan production and line utilization. The loan portfolio continues to be diversified, with the intent to mitigate risk by monitoring concentration in any one sector. The $48.3 million in unearned income recorded at March 31, 2018 was comprised of $32.9 million in net purchase discounts and $15.4 million in deferred loan fees. The $52.1 million in unearned income recorded at December 31, 2017 consisted of $36.3 million in net purchase discounts and $15.8 million in deferred loan fees.

The following table provides additional detail related to the net discount of acquired and purchased loans, excluding PCI loans, by acquisition:

	March 31, 2018			December 31, 2017
Acquisition:	(in thousands)
Pacific Continental	$	22,952		$	24,556
Intermountain	3,312			3,892
West Coast	6,716			7,995
Other	(48		)	(134		)
Total net discount at period end	$	32,932		$	36,309

Commercial Loans: We are committed to providing competitive commercial lending in our primary market areas. Management expects a continued focus within its commercial lending products and to emphasize, in particular, relationship banking with businesses and business owners.

Real Estate Loans: One-to-four family residential loans are secured by properties located within our primary market areas and, typically, have loan-to-value ratios of 80% or lower at origination. Our underwriting standards for commercial and multifamily residential loans generally require that the loan-to-value ratio for these loans not exceed 75% of appraised value, cost, or discounted cash flow value, as appropriate, and that commercial properties maintain debt coverage ratios (net operating income divided by annual debt servicing) of 1.2 or better. However, underwriting standards can be influenced by competition and other factors. We endeavor to maintain the highest practical underwriting standards while balancing the need to remain competitive in our lending practices.

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Real Estate Construction Loans: We originate a variety of real estate construction loans. Underwriting guidelines for these loans vary by loan type but include loan-to-value limits, term limits and loan advance limits, as applicable. Our underwriting guidelines for commercial and multifamily residential real estate construction loans generally require that the loan-to-value ratio not exceed 75% and stabilized debt coverage ratios (net operating income divided by annual debt servicing) of 1.2 or better. As noted above, underwriting standards can be influenced by competition and other factors. However, we endeavor to maintain the highest practical underwriting standards while balancing the need to remain competitive in our lending practices.

Consumer Loans: Consumer loans include automobile loans, boat and recreational vehicle financing, home equity and home improvement loans and miscellaneous personal loans.

Foreign Loans: The Company has no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.

Purchased Credit Impaired Loans: PCI loans are comprised of loans and loan commitments acquired in connection with the 2011 FDIC-assisted acquisitions of First Heritage Bank and Summit Bank, as well as the 2010 FDIC-assisted acquisitions of Columbia River Bank and American Marine Bank. PCI loans are generally accounted for under ASC Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (“ASC 310-30”).

For additional information on our loan portfolio, including amounts pledged as collateral on borrowings, see Note 4 to the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.

Nonperforming Assets

Nonperforming assets consist of: (i) nonaccrual loans, which generally are loans placed on a nonaccrual basis when the loan becomes past due 90 days or when there are otherwise serious doubts about the collectability of principal or interest within the existing terms of the loan, (ii) OREO and (iii) other personal property owned, if applicable.

The following table sets forth, at the dates indicated, information with respect to our nonaccrual loans and total nonperforming assets:

	March 31, 2018			December 31, 2017
	(in thousands)
Nonperforming assets
Nonaccrual loans:
Commercial business	$	57,619		$	45,460
Real estate:
One-to-four family residential	1,054			785
Commercial and multifamily residential	14,539			13,941
Total real estate	15,593			14,726
Real estate construction:
One-to-four family residential	1,210			1,854
Total real estate construction	1,210			1,854
Consumer	4,042			4,149
Total nonaccrual loans	78,464			66,189
Other real estate owned and other personal property owned	11,507			13,298
Total nonperforming assets	$	89,971		$	79,487
Loans, net of unearned income	$	8,339,631		$	8,358,657
Total assets	$	12,530,636		$	12,716,886
Nonperforming loans to period end loans	0.94		%	0.79		%
Nonperforming assets to period end assets	0.72		%	0.63		%

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At March 31, 2018, nonperforming assets were $90.0 million, compared to $79.5 million at December 31, 2017. Nonperforming assets increased$10.5 million during the three months ended March 31, 2018. This increase was primarily due to a $12.2 million increase in nonaccrual commercial business loans, driven by our agricultural loans. This increase was partially offset by OREO sales during the period. For further information on OREO, see Note 7 of the Consolidated Financial Statements in “Item 1. Financial Statements (unaudited)” of this report.

Allowance for Loan and Lease Losses

The allowance for loan and lease losses (“ALLL”) is an accounting estimate of incurred credit losses in our loan portfolio at the balance sheet date. The provision for loan and lease losses is the expense recognized in the Consolidated Statements of Income to adjust the allowance to the levels deemed appropriate by management, as measured by the Company’s credit loss estimation methodologies. The allowance for unfunded commitments and letters of credit is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to these unfunded credit facilities at the balance sheet date.

At March 31, 2018, our allowance was $79.8 million, or 0.96% of total loans (excluding loans held for sale). This compares with an allowance of $75.6 million, or 0.91% of total loans (excluding loans held for sale) at December 31, 2017 and an allowance of $71.0 million or 1.14% of total loans (excluding loans held for sale) at March 31, 2017.

The following table provides an analysis of the Company’s allowance for loans at the dates and the periods indicated:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Beginning balance	$	75,646		$	70,043
Charge-offs:
Commercial business	(2,477		)	(1,127		)
One-to-four family residential	—			(307		)
Commercial and multifamily residential	(223		)	—
One-to-four family residential construction	—			(14		)
Consumer	(264		)	(428		)
Purchased credit impaired	(1,343		)	(1,939		)
Total charge-offs	(4,307		)	(3,815		)
Recoveries:
Commercial business	802			365
One-to-four family residential	172			117
Commercial and multifamily residential	159			78
One-to-four family residential construction	19			29
Consumer	260			285
Purchased credit impaired	1,224			1,144
Total recoveries	2,636			2,018
Net charge-offs	(1,671		)	(1,797		)
Provision for loan and lease losses	5,852			2,775
Ending balance	$	79,827		$	71,021
Total loans, net at end of period, excluding loans held of sale	$	8,339,631		$	6,228,136
Allowance for loan and lease losses to period-end loans	0.96		%	1.14		%
Allowance for unfunded commitments and letters of credit
Beginning balance	$	3,130		$	2,705
Net changes in the allowance for unfunded commitments and letters of credit	1,200			850
Ending balance	$	4,330		$	3,555

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Liquidity and Sources of Funds

Our primary sources of funds are customer deposits. Additionally, we utilize advances from the FHLB of Des Moines (“FHLB”), the Federal Reserve Bank of San Francisco (“FRB”), and sweep repurchase agreements to supplement our funding needs. These funds, together with loan repayments, loan sales, retained earnings, equity and other borrowed funds are used to make loans, to acquire securities and other assets and to fund continuing operations.

In addition, we have a shelf registration statement on file with the Securities and Exchange Commission registering an unlimited amount of any combination of debt or equity securities, depositary shares, purchase contracts, units and warrants in one or more offerings. Specific information regarding the terms of and the securities being offered will be provided at the time of any offering. Proceeds from any future offerings are expected to be used for general corporate purposes, including, but not limited to, the repayment of debt, repurchasing or redeeming outstanding securities, working capital, funding future acquisitions or other purposes identified at the time of any offering.

Deposit Activities

Our deposit products include a wide variety of transaction accounts, savings accounts and time deposit accounts. Core deposits (demand deposit, savings, money market accounts and certificates of deposit less than $250,000) decreased$142.4 million, or 1%, from year-end 2017.

We have established a branch system to serve our consumer and business depositors. In addition, management’s strategy for funding asset growth is to make use of brokered and other wholesale deposits on an as-needed basis. The Company participates in the Certificate of Deposit Account Registry Service (CDARS^®) program. CDARS^® is a network that allows participating banks to offer extended FDIC deposit insurance coverage on time deposits. The Company also participates in a similar program to offer extended FDIC deposit insurance coverage on money market accounts. These extended deposit insurance programs are generally available only to existing customers and are not used as a means of generating additional liquidity. At March 31, 2018, brokered and other wholesale deposits (excluding public deposits) totaled $402.7 million, or 3.9% of total deposits, compared to $392.9 million or 3.7% at year-end 2017. The brokered deposits have varied maturities.

The following table sets forth the Company’s deposit base by type of product for the dates indicated:

	March 31, 2018					December 31, 2017
	Balance			% of Total		Balance			% of Total
	(dollars in thousands)
Core deposits:
Demand and other noninterest-bearing	$	4,927,226		47.4	%	$	5,081,901		48.2	%
Interest-bearing demand	1,328,756			12.8	%	1,265,212			12.0	%
Money market	2,477,487			23.8	%	2,543,712			24.2	%
Savings	886,171			8.5	%	861,941			8.2	%
Certificates of deposit, less than $250,000	277,545			2.7	%	286,791			2.7	%
Total core deposits	9,897,185			95.2	%	10,039,557			95.3	%
Certificates of deposit, $250,000 or more	96,333			0.9	%	100,399			1.0	%
Certificates of deposit insured by CDARS®	23,191			0.2	%	25,374			0.2	%
Other brokered certificates of deposit	76,931			0.7	%	78,481			0.7	%
Brokered money market accounts	302,544			3.0	%	289,031			2.8	%
Subtotal	10,396,184			100.0	%	10,532,842			100.0	%
Discount resulting from acquisition date fair value adjustment	(661		)			(757		)
Total deposits	$	10,395,523				$	10,532,085

Borrowings

We rely on FHLB advances and FRB borrowings as another source of both short and long-term funding. FHLB advances and FRB borrowings are secured by investment securities, and residential, commercial and commercial real estate loans. At March 31, 2018, we had FHLB advances of $41.6 million compared to $11.6 million at December 31, 2017.

46

We also utilize wholesale and retail repurchase agreements to supplement our funding sources. Our wholesale repurchase agreements are secured by mortgage-backed securities. At March 31, 2018 and December 31, 2017, we had deposit customer sweep-related repurchase agreements of $24.2 million and $54.1 million, respectively, which mature on a daily basis.Management anticipates we will continue to rely on FHLB advances, FRB borrowings and wholesale and retail repurchase agreements in the future and we will use those funds primarily to make loans and purchase securities.

Contractual Obligations, Commitments & Off-Balance Sheet Arrangements

We are party to many contractual financial obligations, including repayment of borrowings, operating and equipment lease payments, off-balance sheet commitments to extend credit and investments in affordable housing partnerships. At March 31, 2018, we had commitments to extend credit of $2.62 billion compared to $2.67 billion at December 31, 2017.

Capital Resources

Shareholders’ equity at March 31, 2018 was $1.95 billion, essentially unchanged from December 31, 2017. Shareholders’ equity was 16% of total period-end assets at March 31, 2018 and 15% at December 31, 2017.

Regulatory Capital

In July 2013, the federal bank regulators approved the New Capital Rules (as discussed in our 2017 Annual Report on Form 10-K, “Item 1. Business—Supervision and Regulation and —Regulatory Capital Requirements”), which implement the Basel III capital framework and various provisions of the Dodd-Frank Act. We and the Bank were required to comply with these rules as of January 1, 2015, subject to the phase-in of certain provisions. We believe that, as of March 31, 2018, we and the Bank would meet all capital adequacy requirements under the New Capital Rules on a fully phased-in basis as if all such requirements were then in effect.

FDIC regulations set forth the qualifications necessary for a bank to be classified as “well-capitalized,” primarily for assignment of FDIC insurance premium rates. Failure to qualify as “well-capitalized” can negatively impact a bank’s ability to expand and to engage in certain activities. The Company and the Bank qualified as “well-capitalized” at March 31, 2018 and December 31, 2017.

The following table presents the capital ratios and the capital conservation buffer, as applicable, for the Company and its banking subsidiary at March 31, 2018 and December 31, 2017:

	Company				Columbia Bank
	March 31, 2018		December 31, 2017		March 31, 2018		December 31, 2017
Common equity tier 1 (CET1) risk-based capital ratio	11.9866	%	11.7421	%	12.2638	%	12.0133	%
Tier 1 risk-based capital ratio	11.9866	%	11.8196	%	12.2638	%	12.0133	%
Total risk-based capital ratio	13.2100	%	12.9796	%	13.1237	%	12.8123	%
Leverage ratio	9.9226	%	10.9611	%	10.1566	%	10.8186	%
Capital conservation buffer	5.2100	%	4.9796	%	5.1237	%	4.8123	%

Stock Repurchase Program

On September 27, 2017, the Board of Directors approved a stock repurchase program. The program authorizes the Company to repurchase up to 2.9 million shares of our outstanding common stock. The Company intends to purchase the shares from time to time in the open market or in private transactions, under conditions which allow such repurchases to be accretive to earnings per share while maintaining capital ratios that exceed the guidelines for a well-capitalized financial institution.

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Non-GAAP Financial Measures

The Company considers operating net interest margin (tax equivalent) to be a useful measurement as it more closely reflects the ongoing operating performance of the Company. Additionally, presentation of the operating net interest margin allows readers to compare certain aspects of the Company’s net interest margin to other organizations that may not have had significant acquisitions. Despite the usefulness of the operating net interest margin (tax equivalent) to the Company, there is no standardized definition for it and, as a result, the Company’s calculations may not be comparable with other organizations. The Company encourages readers to consider its Consolidated Financial Statements in their entirety and not to rely on any single financial measure.

The following table reconciles the Company’s calculation of the operating net interest margin (tax equivalent) to the net interest margin (tax equivalent) for the periods indicated:

	Three Months Ended March 31,
	2018			2017
Operating net interest margin non-GAAP reconciliation:	(dollars in thousands)
Net interest income (tax equivalent) (1)	$	117,359		$	89,518
Adjustments to arrive at operating net interest income (tax equivalent):
Incremental accretion income on FDIC purchased credit impaired loans	(329		)	(2,117		)
Incremental accretion income on other acquired loans	(3,370		)	(1,948		)
Premium amortization on acquired securities	2,075			1,462
Interest reversals on nonaccrual loans	417			265
Operating net interest income (tax equivalent) (1)	$	116,152		$	87,180
Average interest earning assets	$	11,122,753		$	8,520,291
Net interest margin (tax equivalent) (1)	4.22		%	4.20		%
Operating net interest margin (tax equivalent) (1)	4.18		%	4.09		%

__________

(1) Tax-exempt interest income has been adjusted to a tax equivalent basis. The amount of such adjustment was an addition to net interest income of $1.9 million and $2.8 million for the three months ended March 31, 2018 and 2017, respectively. The amount of our tax equivalent adjustment for 2018 was impacted by the lower federal corporate tax rate. As a result, our tax equivalent adjustments for tax exempt loans and tax exempt securities were $1.1 million and $836 thousand lower, respectively, than they would have been utilizing the prior federal corporate tax rate. This change in federal corporate tax rate negatively impacted our current quarter net interest margin (tax equivalent) by 7 basis points.

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Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

A number of measures are used to monitor and manage interest rate risk, including income simulations and interest sensitivity (gap) analysis. An income simulation model is the primary tool used to assess the direction and magnitude of changes in net interest income resulting from changes in interest rates. Basic assumptions in the model include prepayment speeds on mortgage-related assets, cash flows and maturities of other investment securities, loan and deposit volumes and pricing. These assumptions are inherently subjective 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 will differ from simulated results due to timing, magnitude and frequency of interest rate changes and changes in market conditions and management strategies, among other factors. At March 31, 2018, based on the measures used to monitor and manage interest rate risk, there has not been a material change in the Company’s interest rate risk since December 31, 2017. For additional information, refer to Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Company’s 2017 Annual Report on Form 10-K.

Item 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

An evaluation was carried out under the supervision and with the participation of the Company’s management, including the Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”), of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934). Based on that evaluation, the CEO and CFO have concluded that as of the end of the period covered by this report, our disclosure controls and procedures are effective in ensuring that the information required to be disclosed by us in the reports we file or submit under the Securities Exchange Act of 1934 is (i) accumulated and communicated to our management (including the CEO and CFO) to allow timely decisions regarding required disclosure, and (ii) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

Changes in Internal Control Over Financial Reporting

There was no change in our internal controls over financial reporting during our most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

49

PART II - OTHER INFORMATION

Item 1. LEGAL PROCEEDINGS

The Company and its subsidiaries are party to routine litigation arising in the ordinary course of business. Management believes that, based on information currently known to it, any liabilities arising from such litigation will not have a material adverse impact on the Company’s financial conditions, results of operations or cash flows.

Item 1A. RISK FACTORS

Refer to Item 1A of Part I of the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a discussion of risk factors relating to the Company’s business. The Company believes that there has been no material change in its risk factors as previously disclosed in the Company’s Form 10-K.

Item 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) Not applicable

(b) Not applicable

(c) The following table provides information about repurchases of common stock by the Company during the quarter ended March 31, 2018:

Period	Total Number of Common Shares Purchased (1)	Average Price Paid per Common Share		Total Number of Shares Purchased as Part of Publicly Announced Plan (2)	Maximum Number of Remaining Shares That May Yet Be Purchased Under the Plan (2)
1/1/2018 - 1/31/2018	—	$	—	—	2,900,000
2/1/2018 - 2/28/2018	276	43.67		—	2,900,000
3/1/2018 - 3/31/2018	60,023	42.71		—	2,900,000
	60,299	$	42.71	—

(1) Common shares repurchased by the Company during the quarter consisted of cancellation of 60,299 shares of common stock to pay the shareholders’ withholding taxes.

(2) The repurchase plan, which was approved in 2017, authorized the Company to repurchase up to 2.9 million shares of its outstanding common stock.

Item 3. DEFAULTS UPON SENIOR SECURITIES

None.

Item 4. MINE SAFETY DISCLOSURES

Not applicable.

Item 5. OTHER INFORMATION

None.

50

Item 6. EXHIBITS

31.1+	Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2+	Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32+	Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101+	The following financial information from Columbia Banking System, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 is formatted in XBRL: (i) the Unaudited Consolidated Balance Sheets, (ii) the Unaudited Consolidated Statements of Income, (iii) the Unaudited Consolidated Statements of Comprehensive Income, (iv) the Unaudited Consolidated Statements of Changes in Shareholders’ Equity, (v) the Unaudited Consolidated Statements of Cash Flows, and (vi) the Notes to Unaudited Consolidated Financial Statements.

+ Filed herewith

51

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		COLUMBIA BANKING SYSTEM, INC.
Date:	May 4, 2018	By	/s/ HADLEY S. ROBBINS
			Hadley S. Robbins
			President and Chief Executive Officer (Principal Executive Officer)
Date:	May 4, 2018	By	/s/ CLINT E. STEIN
			Clint E. Stein
			Executive Vice President, Chief Operating Officer and Chief Financial Officer (Principal Financial Officer)
Date:	May 4, 2018	By	/s/ BARRY S. RAY
			Barry S. Ray
			Senior Vice President and Chief Accounting Officer (Principal Accounting Officer)

52

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Hadley S. Robbins, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Columbia Banking System, 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.

/s/ HADLEY S. ROBBINS

Hadley S. Robbins
President and

Chief Executive Officer

Date: May 4, 2018

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Clint E. Stein, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Columbia Banking System, 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.

/s/ CLINT E. STEIN

Clint E. Stein
Executive Vice President, Chief Operating Officer and
Chief Financial Officer

Date: May 4, 2018

EX-32

EXHIBIT 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Columbia Banking System, Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Hadley S. Robbins, President and Chief Executive Officer, and Clint E. Stein, Executive Vice President, Chief Operating Officer and Chief Financial Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; 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/ HADLEY S. ROBBINS

Hadley S. Robbins

President and

Chief Executive Officer

Columbia Banking System, Inc.

/s/ CLINT E. STEIN

Clint E. Stein

Executive Vice President,

Chief Operating Officer and

Chief Financial Officer

Columbia Banking System, Inc.

Dated: May 4, 2018

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Registrant Name	COLUMBIA BANKING SYSTEM INC
Entity Central Index Key	0000887343
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		73,238,908

XML

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 206,532	$ 244,615
Interest-earning deposits with banks	87,124	97,918
Total cash and cash equivalents	293,656	342,533
Available-for-sale Securities, Debt Securities	2,624,045	2,737,751
Equity securities at fair value	5,000	5,080
Federal Home Loan Bank stock at cost	11,640	10,440
Loans held for sale	4,312	5,766
Loans, net of unearned income	8,339,631	8,358,657
Less: allowance for loan and lease losses	79,827	75,646
Loans, net	8,259,804	8,283,011
Interest receivable	41,795	40,881
Premises and equipment, net	168,366	169,490
Other real estate owned	11,507	13,298
Goodwill	765,842	765,842
Other intangible assets, net	54,985	58,173
Other assets	289,684	284,621
Total assets	12,530,636	12,716,886
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	4,927,226	5,081,901
Interest-bearing	5,468,297	5,450,184
Total deposits	10,395,523	10,532,085
Federal Home Loan Bank advances	41,564	11,579
Securities sold under agreements to repurchase	24,247	79,059
Subordinated Debt	35,601	35,647
Junior Subordinated Notes	0	8,248
Other liabilities	85,778	100,346
Total liabilities	10,582,713	10,766,964
Commitments and contingent liabilities (Note 12)
Shareholders' equity:
Authorized shares	115,000	115,000
Common Stock Shares Issued And Outstanding	73,240	73,020
Common Stock (no par value)	$ 1,634,916	$ 1,634,705
Retained earnings	361,140	337,442
Accumulated other comprehensive loss	(48,133)	(22,225)
Total shareholders’ equity	1,947,923	1,949,922
Total liabilities and shareholders’ equity	$ 12,530,636	$ 12,716,886

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2018	Dec. 31, 2017
Common stock, par value	$ 0	$ 0
Authorized shares	115,000	115,000
Common stock, shares outstanding	73,240	73,020

XML

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Income
Loans	$ 103,027	$ 74,120
Taxable securities	12,708	10,986
Tax-exempt securities	3,064	2,691
Deposits in banks	345	19
Total interest income	119,144	87,816
Interest Expense
Deposits	2,509	787
Federal Home Loan Bank advances	570	225
Interest Expense, Subordinated Notes and Debentures	468	0
Other borrowings	116	129
Total interest expense	3,663	1,141
Net Interest Income	115,481	86,675
Provision for loan and lease losses	5,852	2,775
Net interest income after provision for loan and lease losses	109,629	83,900
Noninterest Income
Deposit account and treasury management fees	8,740	7,287
Card revenue	5,813	5,723
Financial services and trust revenue	2,730	2,839
Loan revenue	3,186	3,593
Merchant Discount Fees	0	2,019
Bank owned life insurance	1,426	1,280
Gain (Loss) on Investments	22	0
Change in FDIC loss-sharing asset	0	(274)
Other	1,226	2,392
Total noninterest income	23,143	24,859
Noninterest Expense
Compensation and employee benefits	50,570	40,825
Occupancy	10,121	7,191
Merchant processing expense	0	1,049
Advertising and promotion	1,429	817
Data processing	5,270	4,208
Legal and professional fees	3,237	3,369
Taxes, licenses and fees	1,425	1,241
Regulatory premiums	937	776
Net cost (benefit) of operation of other real estate owned	1	152
Amortization of intangibles	3,188	1,349
Other	9,809	8,009
Total noninterest expense	85,987	68,986
Income before income taxes	46,785	39,773
Income tax provision	6,815	10,574
Net Income	$ 39,970	$ 29,199
Earnings per common share
Basic ($ per share)	$ 0.55	$ 0.50
Diluted ($ per share)	0.55	0.50
Dividends paid per common share	$ 0.22	$ 0.22
Weighted average number of common shares outstanding	72,300	57,388
Weighted average number of diluted common shares outstanding	72,305	57,394

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net income		$ 39,970	$ 29,199
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		(26,048)	1,702
Reclassification adjustment of net gain from sale of available for sale securities included in income		(78)	0
Net unrealized gain from securities, net of reclassification adjustment		(26,126)	1,702
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period		0	4,604
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		61	87
Pension plan liability adjustment, net		61	4,691
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	(26,065)	6,393
Total comprehensive income		$ 13,905	$ 35,592

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.

XML

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$ 7,891	$ (968)
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	24	0
Net unrealized loss from unfunded defined benefit plan liability arising during the period, tax	0	(2,622)
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	$ (19)	$ (49)

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Preferred Stock [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	$ 67	$ 184	$ (117)
Balance, value at Dec. 31, 2016	1,251,012	$ 995,837	271,957	$ (18,999)	$ 2,217
Balance, shares at Dec. 31, 2016		58,042			9
Net income	29,199		29,199
Other comprehensive income	6,393			6,393
Issuance of common stock - stock option and other plans, value	1,145	$ 1,145
Issuance of common stock - stock option and other plans, shares		28
Issuance of common stock - restricted stock awards, net of cancelled awards, value	2,358	$ 2,358
Conversion of Stock, Shares Converted					(9)
Conversion of Stock, Amount Converted					$ (2,217)
Conversion of Stock, New Issuance		102
Conversion of Stock, Amount Issued	0	$ 2,217
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		207
Stock Repurchased and Retired During Period, Value	(2,039)	$ (2,039)
Stock Repurchased During Period, Shares		(50)
Cash dividends paid on common stock	(12,792)		(12,792)
Balance, value at Mar. 31, 2017	1,275,343	$ 999,702	288,247	(12,606)	$ 0
Balance, shares at Mar. 31, 2017		58,329			0
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	(46)		(203)	157
Balance, value at Dec. 31, 2017	1,949,922	$ 1,634,705	337,442	(22,225)	$ 0
Balance, shares at Dec. 31, 2017		73,020			0
Net income	39,970		39,970
Other comprehensive income	(26,065)			(26,065)
Issuance of common stock - stock option and other plans, value	719	$ 719
Issuance of common stock - stock option and other plans, shares		17
Issuance of common stock - restricted stock awards, net of cancelled awards, value	2,064	$ 2,064
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		263
Stock Repurchased and Retired During Period, Value	(2,575)	$ (2,575)
Stock Repurchased During Period, Shares		(60)
Cash dividends paid on common stock	(16,069)		(16,069)
Balance, value at Mar. 31, 2018	1,947,923	$ 1,634,916	$ 361,140	$ (48,133)	$ 0
Balance, shares at Mar. 31, 2018		73,240			0
Stock Adjustment Deferred Compensation - Shares		0
Stock Adjustment Value Deferred Compensation	$ 3	$ 3

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Sale of Insurance Block	$ 0	$ (1,514)
Repayments of junior subordinated debt	8,248	0
Cash Flows From Operating Activities
Net income	39,970	29,199
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses	5,852	2,775
Stock-based compensation expense	2,064	2,358
Depreciation, amortization and accretion	7,618	6,074
Investment securities gains, net	22	0
Net realized (gain) loss on sale of premises and equipment, loans held for investment and other assets	(630)	55
Net realized loss on sale and valuation adjustments of other real estate owned	135	204
Originations of loans held for sale	27,553	31,295
Proceeds from sales of loans held for sale	29,007	33,896
Net change in:
Interest receivable	(914)	(1,271)
Interest payable	452	(9)
Other assets	2,530	(650)
Other liabilities	(15,014)	(3,841)
Net cash provided by operating activities	43,495	35,981
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	17,688	(21,936)
Purchases of securities available for sale	(27,497)	(108,958)
Purchases of premises and equipment	(2,099)	(336)
Payments to Acquire Federal Home Loan Bank Stock	(45,080)	(31,400)
Proceeds from FDIC for reimbursement on loss-sharing asset	0	26
Proceeds from sales of securities available for sale	19,761	0
Proceeds from principal repayments and maturities of securities available for sale	82,643	55,369
Proceeds from Sales of Assets, Investing Activities	3,721	6,893
Proceeds from Sale of Federal Home Loan Bank Stock	43,880	31,040
Proceeds from sales of other real estate and other personal property owned	2,062	1,275
Payments to FDIC related to loss-sharing asset	0	(210)
Net cash provided by (used in) investing activities	95,079	(68,237)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(136,466)	29,433
Net decrease in sweep repurchase agreements	(54,812)	(33,908)
Proceeds from Federal Home Loan Bank advances	1,127,000	785,000
Proceeds from exercise of stock options	719	1,145
Repayment of Federal Home Loan Bank advances	(1,097,000)	(776,000)
Payment of common stock dividends	(16,069)	(12,792)
Purchase and retirement of common stock	2,575	2,039
Net cash used in financing activities	(187,451)	(9,161)
Decrease in cash and cash equivalents	(48,877)	(41,417)
Cash and cash equivalents at beginning of period	342,533	224,238
Cash and cash equivalents at end of period	293,656	182,821
Supplemental Information:
Cash paid for interest	3,211	1,150
Cash paid for income tax	24	0
Non-cash investing and financing activities
Loans transferred to other real estate owned	$ 406	$ 0

XML

Basis of Presentation and Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Basis of Presentation And Significant Accounting Policies

Basis of Presentation and Significant Accounting Policies

Basis of Presentation, Significant Accounting Policies and Recent Developments

Basis of Presentation

The interim unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with instructions to Form 10-Q and Article 10 of Regulation S-X. The Consolidated Financial Statements include the accounts of Columbia Banking System, Inc. (“we”, “our”, “Columbia” or the “Company”) and its subsidiaries, including its wholly owned banking subsidiary Columbia State Bank (“Columbia Bank” or the “Bank”) and Columbia Trust Company (“Columbia Trust”). All intercompany transactions and accounts have been eliminated in consolidation. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair statement of the results for the interim periods presented have been included. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of results to be anticipated for the year ending December 31, 2018. The accompanying interim unaudited Consolidated Financial Statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2017 Annual Report on Form 10-K.

Significant Accounting Policies

The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2017 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2017 Form 10-K disclosure for the year ended December 31, 2017.

Reclassifications

Certain amounts reported in prior periods may have been reclassified in the Consolidated Financial Statements to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

XML

Accounting Pronouncements Recently Issued

3 Months Ended

Mar. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Accounting Pronouncements Recently Issued

Accounting Pronouncements Recently Issued

In August 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-15, Classification of Certain Cash Receipts and Cash Payments. The amendments in this ASU provide specific guidance on several statement of cash flow classification issues to reduce diversity in practice. The amendments in ASU 2016-15 are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The Company has reclassified items in the Statement of Cash Flows for the three months ended March 31, 2017 to conform with its current presentation based on its adoption of ASU 2016-15.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. The amendments included in this ASU require an entity to reflect its current estimate of all expected credit losses for assets held at an amortized cost basis. For available for sale debt securities, credit losses will be measured in a manner similar to current GAAP, however, this ASU will require that credit losses be presented as an allowance rather than as a write-down. The amendments in ASU 2016-13 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and are required to be adopted through a modified retrospective approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the ASU is effective.

Currently, the Company cannot reasonably estimate the impact that adoption of ASU 2016-13 will have on its Consolidated Financial Statements; however, the impact may be significant. That assessment is based upon the fact that, unlike the incurred loss models in existing GAAP, the current expected credit loss (“CECL”) model in ASU 2016-13 does not specify a threshold for the recognition of an impairment allowance. Rather, the Company will recognize an impairment allowance equal to its estimate of lifetime expected credit losses, adjusted for prepayments, for in-scope financial instruments as of the end of the reporting period. Accordingly, the impairment allowance measured under the CECL model could increase significantly from the impairment allowance measured under the Company’s existing incurred loss model. Significant CECL implementation matters to be addressed by the Company include selecting loss estimation methodologies, identifying, sourcing and storing data, addressing data gaps, defining a reasonable and supportable forecast period, selecting historical loss information which will be reverted to, documenting the CECL estimation process, assessing the impact to internal controls over financial reporting, capital planning and seeking process approval from audit and regulatory stakeholders.

In February 2016, the FASB issued ASU 2016-02, Leases. The amendments included in this ASU create a new accounting model for both lessees and lessors. The new guidance requires lessees to recognize lease liabilities, initially measured as the present value of future lease payments, and corresponding right-of-use assets for all leases with lease terms greater than 12 months. This model differs from the current lease accounting model, which does not require such lease liabilities and corresponding right-of-use assets to be recorded for operating leases. The amendments in ASU 2016-02 must be adopted using the modified retrospective approach and will be effective for the first interim or annual period beginning after December 15, 2018. Early adoption is permitted. During 2017, the Company selected a third-party lease accounting application to assist in the implementation of this new guidance. Significant implementation matters to be addressed by the Company include assessing the impact to our internal controls over financial reporting and documenting the new lease accounting process. We do not expect a material impact to our Consolidated Statement of Income as a result of this ASU. See Note 18, “Commitments and Contingent Liabilities” to our 2017 Form 10-K, for more information regarding the minimum future payments related to our operating leases.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in ASU 2016-01 require all equity investments to be measured at fair value with changes in the fair value recognized through net income. The amendments in ASU 2016-01 also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. In addition, the amendments in this update eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet for public business entities. The amendments in ASU 2016-01 are effective for the first interim or annual period beginning after December 15, 2017. The Company adopted the amendments of ASU 2016-01 effective January 1, 2018 and recorded a cumulative effect adjustment of $203 thousand to retained earnings related to the unrealized holding losses on equity securities with readily determinable fair value included in accumulated other comprehensive loss. The Company also added a separate line item on the Consolidated Balance Sheet for equity securities at fair value and reclassified amounts previously included in securities available for sale at fair value to conform to current period presentation. In addition, as required by the ASU, the fair value disclosure for loans is computed using an exit price notion and deposits with no stated maturity are no longer included in the fair value disclosures in Note 15.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. The guidance requires that revenue from contracts with customers be recognized when transfer of control over goods or services is passed to customers in the amount of consideration expected to be received. Subsequent Accounting Standard Updates have been issued clarifying the original pronouncement (ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20). The majority of the Company’s revenue is comprised of interest income from financial assets, which is specifically outside the scope of ASU 2014-09.

On January 1, 2018, we adopted the accounting guidance in ASU 2014-09 and all the related amendments (“Topic 606”) using the modified retrospective method for all contracts that have not been completed (i.e. open contracts). Therefore, the comparative information has not been adjusted and continues to be reported under Topic 605. There was no cumulative effect adjustment as of January 1, 2018, and there were no material changes to the timing or amount of revenue recognized for the three months ended March 31, 2018; however, additional disclosures were incorporated in the footnotes upon adoption. See Note 17, “Revenue from Contracts with Customers,” for more information.

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Business Combinations

3 Months Ended

Mar. 31, 2018

Business Acquisition [Line Items]

Business Combination Disclosure [Text Block]

On November 1, 2017, the Company completed its acquisition of Pacific Continental Corporation (“Pacific Continental”) and its wholly-owned banking subsidiary Pacific Continental Bank. The Company acquired 100% of the equity interests of Pacific Continental. The primary reasons for the acquisition were to expand in the Eugene, Oregon market and improve branch network efficiencies in the Seattle and Portland markets.

The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the November 1, 2017 acquisition date. Initial accounting for deferred taxes was incomplete as of March 31, 2018. The deferred taxes currently recognized in the financial statements have been determined provisionally as the final Pacific Continental tax return has not yet been completed. The application of the acquisition method of accounting resulted in the recognition of goodwill of $383.1 million and a core deposit intangible of $46.9 million, or 2.34% of core deposits. The goodwill represents the excess purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes.

The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:

	November 1, 2017
	(in thousands)
Merger consideration				$	637,103
Identifiable net assets acquired, at fair value
Assets acquired
Cash and cash equivalents	$	81,190
Investment securities	449,291
Federal Home Loan Bank stock	7,084
Loans	1,873,987
Interest receivable	7,827
Premises and equipment	27,343
Other real estate owned	10,279
Core deposit intangible	46,875
Other assets	50,638
Total assets acquired				2,554,514
Liabilities assumed
Deposits	(2,118,982		)
Federal Home Loan Bank advances	(101,127		)
Subordinated debentures	(35,678		)
Junior subordinated debentures	(14,434		)
Securities sold under agreements to repurchase	(1,617		)
Other liabilities	(28,653		)
Total liabilities assumed				(2,300,491		)
Total fair value of identifiable net assets, at fair value				254,023
Goodwill				$	383,080

See Note 8, “Goodwill and Other Intangible Assets,” for further discussion of the accounting for goodwill and other intangible assets.

The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period January 1, 2018 to March 31, 2018. Disclosure of the amount of Pacific Continental’s revenue and net income (excluding integration costs) included in Columbia’s Consolidated Statements of Income is impracticable due to the integration of the operations and accounting for this acquisition.

For illustrative purposes only, the following table presents certain unaudited pro forma information for the three months ended March 31, 2017. This unaudited estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.

	Unaudited Pro Forma
	Three Months Ended March 31,
	2017
	(in thousands except per share)
Total revenues (net interest income plus noninterest income)	$	139,363
Net income	$	37,147
Earnings per share - basic	$	0.52
Earnings per share - diluted	$	0.52

The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Noninterest Expense
Compensation and employee benefits	$	1,556	$	—
Occupancy	1,004		1
Advertising and promotion	512		6
Data processing	287		—
Legal and professional fees	574		1,311
Other	332		46
Total impact of acquisition-related costs to noninterest expense	$	4,265	$	1,364

As a result of the acquisition of Pacific Continental, we have consolidated assets exceeding $10 billion and we will be subject to the interchange fee cap imposed under the Dodd-Frank Wall Street Reform and Consumer Protection Act beginning July 1, 2018. We currently anticipate a pre-tax annual impact of approximately $10 million because we will no longer qualify for the small issuer exemption.

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Securities

3 Months Ended

Mar. 31, 2018

Available-for-sale Securities [Abstract]

Securities

Securities

The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,693,149	$	698	$	(48,629	)	$	1,645,218
State and municipal securities	588,218		3,467		(8,937		)	582,748
U.S. government agency and government-sponsored enterprise securities	402,036		43		(6,247		)	395,832
U.S. government securities	251		—		(4		)	247
Total	$	2,683,654	$	4,208	$	(63,817	)	$	2,624,045
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,752,236	$	1,815	$	(27,326	)	$	1,726,725
State and municipal securities	593,940		6,023		(3,959		)	596,004
U.S. government agency and government-sponsored enterprise securities	416,894		642		(2,762		)	414,774
U.S. government securities	251		—		(3		)	248
Total	$	2,763,321	$	8,480	$	(34,050	)	$	2,737,751

The following table provides the proceeds and gross realized gains and losses on sales of debt securities available for sale as well as other securities gains and losses for the periods indicated:

	Three Months Ended
	March 31,
	2018			2017
	(in thousands)
Proceeds from sales of debt securities available for sale	$	19,761		$	—
Gross realized gains from sales of debt securities available for sale	$	148		$	—
Gross realized losses from sales of debt securities available for sale	(46		)	—
Other securities losses, net (1)	(80		)	—
Investment securities gains, net	$	22		$	—

__________

(1) Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.

The scheduled contractual maturities of debt securities available for sale at March 31, 2018 are presented as follows:

	March 31, 2018
	Amortized Cost		Fair Value
	(in thousands)
Due within one year	$	161,538	$	161,314
Due after one year through five years	635,254		626,693
Due after five years through ten years	756,950		737,927
Due after ten years	1,129,912		1,098,111
Total debt securities available for sale	$	2,683,654	$	2,624,045

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

	March 31, 2018
	(in thousands)
Washington and Oregon State to secure public deposits	$	246,950
Federal Reserve Bank to secure borrowings	52,754
Other securities pledged	102,363
Total securities pledged as collateral	$	402,067

The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018 and December 31, 2017:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	921,993	$	(19,073	)	$	681,577	$	(29,556	)	$	1,603,570	$	(48,629	)
State and municipal securities	315,392		(4,972		)	76,452		(3,965		)	391,844		(8,937		)
U.S. government agency and government-sponsored enterprise securities	251,626		(3,969		)	140,455		(2,278		)	392,081		(6,247		)
U.S. government securities	247		(4		)	—		—			247		(4		)
Total	$	1,489,258	$	(28,018	)	$	898,484	$	(35,799	)	$	2,387,742	$	(63,817	)
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	816,678	$	(6,710	)	$	717,211	$	(20,616	)	$	1,533,889	$	(27,326	)
State and municipal securities	220,019		(1,723		)	75,172		(2,236		)	295,191		(3,959		)
U.S. government agency and government-sponsored enterprise securities	184,046		(1,006		)	155,983		(1,756		)	340,029		(2,762		)
U.S. government securities	249		(3		)	—		—			249		(3		)
Total	$	1,220,992	$	(9,442	)	$	948,366	$	(24,608	)	$	2,169,358	$	(34,050	)

At March 31, 2018, there were 446 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 117 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

At March 31, 2018, there were 406 state and municipal government securities in an unrealized loss position, of which 71 were in a continuous loss position for 12 months or more. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of March 31, 2018, none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

At March 31, 2018, there were 50 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, of which 16 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not currently intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at March 31, 2018.

At March 31, 2018, there was one U.S. government security in an unrealized loss position, which was not in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where this investment falls within the yield curve and its individual characteristics. Because the Company does not currently intend to sell this security nor does the Company consider it more likely than not that it will be required to sell this security before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider this investment to be other-than-temporarily impaired at March 31, 2018.

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Loans

3 Months Ended

Mar. 31, 2018

Loans Receivable, Net [Abstract]

Loans

Loans

The Company’s loan portfolio includes originated and purchased loans. Originated loans and purchased loans for which there was no evidence of credit deterioration at their acquisition date and it was probable that we would be able to collect all contractually required payments are referred to collectively as loans, excluding purchased credit impaired loans. Purchased loans for which there was, at acquisition date, evidence of credit deterioration since their origination and it was probable that we would be unable to collect all contractually required payments are referred to as purchased credit impaired loans, or “PCI loans.”

The following is an analysis of the loan portfolio by segment (net of unearned income):

	March 31, 2018									December 31, 2017
	Loans, excluding PCI loans			PCI Loans			Total			Loans, excluding PCI loans			PCI Loans			Total
	(in thousands)
Commercial business	$	3,402,162		$	13,536		$	3,415,698		$	3,377,324		$	12,628		$	3,389,952
Real estate:
One-to-four family residential	182,302			10,684			192,986			188,396			12,395			200,791
Commercial and multifamily residential	3,776,709			73,446			3,850,155			3,825,739			75,594			3,901,333
Total real estate	3,959,011			84,130			4,043,141			4,014,135			87,989			4,102,124
Real estate construction:
One-to-four family residential	208,441			171			208,612			200,518			177			200,695
Commercial and multifamily residential	385,339			611			385,950			371,931			607			372,538
Total real estate construction	593,780			782			594,562			572,449			784			573,233
Consumer	323,631			10,851			334,482			334,190			11,269			345,459
Less: Net unearned income	(48,252		)	—			(48,252		)	(52,111		)	—			(52,111		)
Total loans, net of unearned income	8,230,332			109,299			8,339,631			8,245,987			112,670			8,358,657
Less: Allowance for loan and lease losses	(74,162		)	(5,665		)	(79,827		)	(68,739		)	(6,907		)	(75,646		)
Total loans, net	$	8,156,170		$	103,634		$	8,259,804		$	8,177,248		$	105,763		$	8,283,011
Loans held for sale	$	4,312		$	—		$	4,312		$	5,766		$	—		$	5,766

At March 31, 2018 and December 31, 2017, the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho.

The Company has made loans to executive officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans was $9.9 million and $10.0 million at March 31, 2018 and December 31, 2017, respectively. During the first three months of 2018, there were no advances and $86 thousand in repayments.

At March 31, 2018 and December 31, 2017, $2.28 billion and $2.25 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank of Des Moines (“FHLB”) borrowings and additional borrowing capacity. The Company has also pledged $72.5 million and $70.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at March 31, 2018 and December 31, 2017, respectively.

The following is an analysis of nonaccrual loans as of March 31, 2018 and December 31, 2017:

	March 31, 2018				December 31, 2017
	Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans		Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans
	(in thousands)
Commercial business:
Secured	$	57,504	$	69,056	$	45,410	$	56,865
Unsecured	115		115		50		49
Real estate:
One-to-four family residential	1,054		1,426		785		1,182
Commercial & multifamily residential:
Commercial land	3,192		3,201		2,628		2,623
Income property	3,980		4,264		4,284		5,410
Owner occupied	7,367		7,621		7,029		7,270
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		25		26
Residential construction	1,210		1,210		1,829		1,828
Consumer	4,042		4,378		4,149		4,633
Total	$	78,464	$	91,271	$	66,189	$	79,886

Loans, excluding purchased credit impaired loans

The following is an aging of the recorded investment of the loan portfolio as of March 31, 2018 and December 31, 2017:

	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,189,473	$	16,410	$	2,872	$	—	$	19,282	$	57,504	$	3,266,259
Unsecured	119,863		50		51		—		101		115		120,079
Real estate:
One-to-four family residential	179,174		340		—		—		340		1,054		180,568
Commercial & multifamily residential:
Commercial land	283,973		2,299		—		—		2,299		3,192		289,464
Income property	1,867,450		1,929		815		—		2,744		3,980		1,874,174
Owner occupied	1,570,051		10,751		2,772		—		13,523		7,367		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	5,937		318		285		—		603		—		6,540
Residential construction	199,756		112		—		—		112		1,210		201,078
Commercial & multifamily residential:
Income property	295,067		11,070		—		—		11,070		—		306,137
Owner occupied	73,016		—		—		—		—		—		73,016
Consumer	316,557		1,229		248		—		1,477		4,042		322,076
Total	$	8,100,317	$	44,508	$	7,043	$	—	$	51,551	$	78,464	$	8,230,332
	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,185,321	$	2,530	$	2,400	$	—	$	4,930	$	45,410	$	3,235,661
Unsecured	123,524		100		501		—		601		50		124,175
Real estate:
One-to-four family residential	184,256		1,111		402		—		1,513		785		186,554
Commercial & multifamily residential:
Commercial land	292,680		92		—		581		673		2,628		295,981
Income property	1,898,655		2,426		971		—		3,397		4,284		1,906,336
Owner occupied	1,590,004		2,485		468		—		2,953		7,029		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		—		—		—		25		9,907
Residential construction	187,862		—		—		—		—		1,829		189,691
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		293,028
Owner occupied	72,443		—		—		—		—		—		72,443
Consumer	325,928		1,446		702		—		2,148		4,149		332,225
Total	$	8,163,583	$	10,190	$	5,444	$	581	$	16,215	$	66,189	$	8,245,987

The following is an analysis of impaired loans as of March 31, 2018 and December 31, 2017:

	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,221,659	$	44,600	$	13,836	$	18,931	$	5,657	$	30,764	$	33,785
Unsecured	120,056		23		23		23		2		—		—
Real estate:
One-to-four family residential	179,700		868		428		715		22		440		1,017
Commercial & multifamily residential:
Commercial land	286,613		2,851		—		—		—		2,851		2,860
Income property	1,870,614		3,560		—		—		—		3,560		3,623
Owner occupied	1,582,385		8,556		3,399		4,821		5		5,157		5,269
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		—		—
Residential construction	199,868		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	306,137		—		—		—		—		—		—
Owner occupied	68,966		4,050		—		—		—		4,050		4,050
Consumer	315,845		6,231		5,439		5,707		171		792		860
Total	$	8,158,383	$	71,949	$	23,125	$	30,197	$	5,857	$	48,824	$	52,674
	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,195,649	$	40,012	$	3,808	$	3,937	$	1,867	$	36,204	$	42,314
Unsecured	124,150		25		25		24		3		—		—
Real estate:
One-to-four family residential	185,659		895		867		1,408		103		28		337
Commercial & multifamily residential:
Commercial land	293,694		2,287		—		—		—		2,287		2,282
Income property	1,901,313		5,023		2,768		3,328		185		2,255		2,601
Owner occupied	1,591,298		8,688		77		80		3		8,611		10,077
Real estate construction:
One-to-four family residential:
Land and acquisition	9,907		—		—		—		—		—		—
Residential construction	188,481		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		—
Owner occupied	68,393		4,050		—		—		—		4,050		4,050
Consumer	325,210		7,015		5,303		5,568		199		1,712		1,864
Total	$	8,176,782	$	69,205	$	12,848	$	14,345	$	2,360	$	56,357	$	64,735

The following table provides additional information on impaired loans for the three month periods indicated:

	Three Months Ended March 31,
	2018				2017
	Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans		Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans
	(in thousands)
Commercial business:
Secured	$	42,306	$	12	$	8,303	$	19
Unsecured	24		—		—		—
Real estate:
One-to-four family residential	881		7		521		2
Commercial & multifamily residential:
Commercial land	2,569		—		1,504		—
Income property	4,292		31		4,059		1
Owner occupied	8,622		84		4,462		—
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		7		—
Residential construction	1,210		—		168		—
Commercial & multifamily residential:
Owner occupied	4,050		51		—		—
Consumer	6,623		54		5,370		27
Total	$	70,577	$	239	$	24,394	$	49

The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three months ended March 31, 2018 and 2017:

	Three months ended March 31, 2018					Three months ended March 31, 2017
	Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
	(dollars in thousands)
Commercial business:
Secured	1	$	450	$	450	3	$	356	$	356
Real estate:
Commercial and multifamily residential:
Income property	1	891		891		—	—		—
Consumer	7	1,143		1,143		10	1,546		1,546
Total	9	$	2,484	$	2,484	13	$	1,902	$	1,902

The Company’s loans classified as TDR are loans that have been modified or the borrower has been granted special concessions due to financial difficulties that, if not for the challenges of the borrower, the Company would not otherwise consider. The TDR modifications or concessions are made to increase the likelihood that these borrowers with financial difficulties will be able to satisfy their debt obligations as amended. The concessions granted in the restructurings summarized in the table above largely consisted of maturity extensions, interest rate modifications or a combination of both. In limited circumstances, a reduction in the principal balance of the loan could also be made as a concession. Credit losses for loans classified as TDR are measured on the same basis as impaired loans. For impaired loans, an allowance is established when the collateral value less selling costs (or discounted cash flows or observable market price) of the impaired loan is lower than the recorded investment of that loan.

The Company had commitments to lend $121 thousand of additional funds on loans classified as TDR as of March 31, 2018. The Company had $506 thousand of such commitments at December 31, 2017. The Company did not have any loans modified as TDR that defaulted within 12 months of being modified as TDR during the three months ended March 31, 2018 and 2017.

Purchased Credit Impaired Loans

Purchased credit impaired (“PCI”) loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis.

Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows.

Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix, which utilizes probability values of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools.

The excess of cash flows expected to be collected over the initial fair value of purchased credit impaired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates.

The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
	(in thousands)
Commercial business	$	14,201	$	13,753
Real estate:
One-to-four family residential	12,738		14,610
Commercial and multifamily residential	77,400		79,211
Total real estate	90,138		93,821
Real estate construction:
One-to-four family residential	171		177
Commercial and multifamily residential	589		595
Total real estate construction	760		772
Consumer	11,989		12,412
Subtotal of PCI loans	117,088		120,758
Less:
Valuation discount resulting from acquisition accounting	7,789		8,088
Allowance for loan losses	5,665		6,907
PCI loans, net of allowance for loan losses	$	103,634	$	105,763

The following table shows the changes in accretable yield for PCI loans for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance at beginning of period	$	31,176		$	45,191
Accretion	(2,265		)	(4,182		)
Disposals	(159		)	(158		)
Reclassifications from (to) nonaccretable difference	603			(2,407		)
Balance at end of period	$	29,355		$	38,444

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Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit

3 Months Ended

Mar. 31, 2018

Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit

Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit Text Block

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit

We record an allowance for loan and lease losses (the “allowance”) to recognize management’s estimate of credit losses incurred in the loan portfolio at each balance sheet date. We have used the same methodology for allowance calculations during the three months ended March 31, 2018 and 2017.

The following tables show a detailed analysis of the allowance for the three months ended March 31, 2018 and 2017:

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2018	(in thousands)
Commercial business:
Secured	$	29,341	$	(2,414	)	$	553	$	9,851		$	37,331	$	5,657	$	31,674
Unsecured	2,000		(63		)	249		409			2,595		2		2,593
Real estate:
One-to-four family residential	701		—			172		(315		)	558		22		536
Commercial & multifamily residential:
Commercial land	4,265		—			6		(526		)	3,745		—		3,745
Income property	5,672		(223		)	141		(888		)	4,702		—		4,702
Owner occupied	5,459		—			12		(722		)	4,749		5		4,744
Real estate construction:
One-to-four family residential:
Land and acquisition	963		—			16		(67		)	912		—		912
Residential construction	3,709		—			3		924			4,636		—		4,636
Commercial & multifamily residential:
Income property	7,053		—			—		421			7,474		—		7,474
Owner occupied	4,413		—			—		(2,490		)	1,923		—		1,923
Consumer	5,163		(264		)	260		57			5,216		171		5,045
Purchased credit impaired	6,907		(1,343		)	1,224		(1,123		)	5,665		—		5,665
Unallocated	—		—			—		321			321		—		321
Total	$	75,646	$	(4,307	)	$	2,636	$	5,852		$	79,827	$	5,857	$	73,970

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2017	(in thousands)
Commercial business:
Secured	$	36,050	$	(1,109	)	$	297	$	434		$	35,672	$	—	$	35,672
Unsecured	960		(18		)	68		178			1,188		—		1,188
Real estate:
One-to-four family residential	599		(307		)	117		236			645		11		634
Commercial & multifamily residential:
Commercial land	1,797		—			—		491			2,288		—		2,288
Income property	7,342		—			35		(574		)	6,803		26		6,777
Owner occupied	6,439		—			43		52			6,534		—		6,534
Real estate construction:
One-to-four family residential:
Land and acquisition	316		(14		)	20		187			509		—		509
Residential construction	669		—			9		431			1,109		—		1,109
Commercial & multifamily residential:
Income property	404		—			—		378			782		—		782
Owner occupied	1,192		—			—		576			1,768		—		1,768
Consumer	3,534		(428		)	285		(31		)	3,360		57		3,303
Purchased credit impaired	10,515		(1,939		)	1,144		(325		)	9,395		—		9,395
Unallocated	226		—			—		742			968		—		968
Total	$	70,043	$	(3,815	)	$	2,018	$	2,775		$	71,021	$	94	$	70,927

Changes in the allowance for unfunded commitments and letters of credit, a component of “Other liabilities” in the Consolidated Balance Sheets, are summarized as follows:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands)
Balance at beginning of period	$	3,130	$	2,705
Net changes in the allowance for unfunded commitments and letters of credit	1,200		850
Balance at end of period	$	4,330	$	3,555

Risk Elements

The extension of credit in the form of loans or other credit products to individuals and businesses is one of our principal business activities. Our policies and applicable laws and regulations require risk analysis as well as ongoing portfolio and credit management. We manage our credit risk through lending limit constraints, credit review, approval policies and extensive, ongoing internal monitoring. We also manage credit risk through diversification of the loan portfolio by type of loan, type of industry and type of borrower and by limiting the aggregation of debt to a single borrower.

Risk ratings are reviewed and updated whenever appropriate, with more periodic reviews as the risk and dollar value of loss on the loan increases. In the event full collection of principal and interest is not reasonably assured, the loan is appropriately downgraded and, if warranted, placed on nonaccrual status even though the loan may be current as to principal and interest payments. Additionally, we assess whether an impairment of a loan warrants specific reserves or a write-down of the loan.

Pass rated loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention rated loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reported as classified loans in our allowance analysis. We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. Loans risk rated as Substandard reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful rated loans have a high probability of loss; however, the amount of loss has not yet been determined. Loss rated loans are considered uncollectable and when identified, are charged off.

The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans, as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,067,417	$	47,672	$	151,170	$	—	$	—	$	3,266,259
Unsecured	119,416		—		663		—		—		120,079
Real estate:
One-to-four family residential	177,122		1,208		2,238		—		—		180,568
Commercial and multifamily residential:
Commercial land	279,949		1,288		8,227		—		—		289,464
Income property	1,837,613		19,863		16,698		—		—		1,874,174
Owner occupied	1,542,605		8,986		39,350		—		—		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		6,540
Residential construction	199,868		—		1,210		—		—		201,078
Commercial and multifamily residential:
Income property	303,079		—		3,058		—		—		306,137
Owner occupied	67,672		—		5,344		—		—		73,016
Consumer	314,223		—		7,853		—		—		322,076
Total	$	7,915,504	$	79,017	$	235,811	$	—	$	—	8,230,332
Less:
Allowance for loan and lease losses											74,162
Loans, excluding PCI loans, net											$	8,156,170

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,049,031	$	64,600	$	122,030	$	—	$	—	$	3,235,661
Unsecured	123,621		—		554		—		—		124,175
Real estate:
One-to-four family residential	183,312		1,186		2,056		—		—		186,554
Commercial and multifamily residential:
Commercial land	283,673		5,204		7,104		—		—		295,981
Income property	1,857,832		17,181		31,323		—		—		1,906,336
Owner occupied	1,546,775		7,380		45,831		—		—		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		25		—		—		9,907
Residential construction	187,863		—		1,828		—		—		189,691
Commercial and multifamily residential:
Income property	293,028		—		—		—		—		293,028
Owner occupied	68,393		—		4,050		—		—		72,443
Consumer	323,129		—		9,096		—		—		332,225
Total	$	7,926,539	$	95,551	$	223,897	$	—	$	—	8,245,987
Less:
Allowance for loan and lease losses											68,739
Loans, excluding PCI loans, net											$	8,177,248

The following is an analysis of the credit quality of our PCI loan portfolio as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
PCI loans:
Commercial business:
Secured	$	12,582	$	—	$	728	$	—	$	—	$	13,310
Unsecured	891		—		—		—		—		891
Real estate:
One-to-four family residential	11,967		—		771		—		—		12,738
Commercial and multifamily residential:
Commercial land	12,223		—		—		—		—		12,223
Income property	22,384		—		—		—		—		22,384
Owner occupied	41,874		—		919		—		—		42,793
Real estate construction:
One-to-four family residential:
Land and acquisition	164		—		7		—		—		171
Commercial and multifamily residential:
Income property	589		—		—		—		—		589
Consumer	11,514		—		475		—		—		11,989
Total	$	114,188	$	—	$	2,900	$	—	$	—	117,088
Less:
Valuation discount resulting from acquisition accounting											7,789
Allowance for loan losses											5,665
PCI loans, net											$	103,634

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
PCI loans:
Commercial business:
Secured	$	11,918	$	—	$	723	$	—	$	—	$	12,641
Unsecured	1,045		—		67		—		—		1,112
Real estate:
One-to-four family residential	13,817		—		793		—		—		14,610
Commercial and multifamily residential:
Commercial land	9,460		349		—		—		—		9,809
Income property	25,981		—		35		—		—		26,016
Owner occupied	42,617		—		769		—		—		43,386
Real estate construction:
One-to-four family residential:
Land and acquisition	169		—		8		—		—		177
Commercial and multifamily residential:
Income property	595		—		—		—		—		595
Consumer	11,705		—		707		—		—		12,412
Total	$	117,307	$	349	$	3,102	$	—	$	—	120,758
Less:
Valuation discount resulting from acquisition accounting											8,088
Allowance for loan losses											6,907
PCI loans, net											$	105,763

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Other Real Estate Owned

3 Months Ended

Mar. 31, 2018

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Other Real Estate Owned

Other Real Estate Owned (“OREO”)

The following tables set forth activity in OREO for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance, beginning of period	$	13,298		$	5,998
Transfers in	406			—
Valuation adjustments	(92		)	(193		)
Proceeds from sale of OREO property	(2,062		)	(1,275		)
Loss on sale of OREO, net	(43		)	(11		)
Balance, end of period	$	11,507		$	4,519

At March 31, 2018, there were $433 thousand in foreclosed residential real estate properties held as OREO and the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process was $638 thousand.

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Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Other Intangible Assets

In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value.

The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.

The following table sets forth activity for goodwill and other intangible assets for the periods indicated:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Goodwill
Total goodwill (1)	$	765,842		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	105,473			58,598
Accumulated amortization at beginning of period	(48,219		)	(41,886		)
Core deposit intangible, net at beginning of period	57,254			16,712
CDI current period amortization	(3,188		)	(1,349		)
Total core deposit intangible, net at end of period	54,066			15,363
Intangible assets not subject to amortization	919			919
Other intangible assets, net at end of period	54,985			16,282
Total goodwill and other intangible assets at end of period	$	820,827		$	399,044

__________

(1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2018 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2018	$	9,048
2019	10,479
2020	8,724
2021	7,264
2022	5,880

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Subordinated debentures

3 Months Ended

Mar. 31, 2018

Subordinated Borrowing [Line Items]

Subordinated Borrowings Disclosure [Text Block]

Subordinated Debentures

On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $35.0 million in aggregate principal amount of fixed-to-floating rate subordinated debentures (the “Notes”). The Notes are callable at par on June 30, 2021, have a stated maturity of June 30, 2026 and bear interest at a fixed annual rate of 5.875% per year, from and including June 27, 2016, but excluding June 30, 2021. From and including June 30, 2021 through the maturity date or early redemption date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR plus 471.5 basis points.

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Junior subordinated debt

3 Months Ended

Mar. 31, 2018

Junior subordinated debt [Abstract]

Junior subordinated debentures [Text Block]

Junior Subordinated Debentures

On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $14.4 million of trust preferred obligations. The Company redeemed $6.2 million of these obligations during 2017. The remaining $8.2 million of obligations were redeemed in January 2018.

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Derivatives and Balance Sheet Offsetting

3 Months Ended

Mar. 31, 2018

General Discussion of Derivative Instruments and Hedging Activities [Abstract]

Derivatives and Hedging Activities

Derivatives and Balance Sheet Offsetting

The Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third-party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at March 31, 2018 and December 31, 2017 was $393.8 million and $384.7 million, respectively. During the three months ended March 31, 2018 and March 31, 2017, mark-to-market gains of $6 thousand and $4 thousand, respectively, were recorded to “Other” noninterest expense.

The following table presents the fair value of derivatives not designated as hedging instruments at March 31, 2018 and December 31, 2017:

Asset Derivatives

Liability Derivatives

March 31, 2018

December 31, 2017

March 31, 2018

December 31, 2017

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

(in thousands)

Interest rate contracts

Other assets

$

7,406

Other assets

$

6,707

Other liabilities

$

7,409

Other liabilities

$

6,714

The Company is party to interest rate contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.

	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Collateral Posted			Net Amount
March 31, 2018	(in thousands)
Assets
Interest rate contracts	$	7,406	$	—	$	7,406	$	—		$	7,406
Liabilities
Interest rate contracts	$	7,409	$	—	$	7,409	$	(1,190	)	$	6,219
Repurchase agreements	$	24,247	$	—	$	24,247	$	(24,247	)	$	—
December 31, 2017
Assets
Interest rate contracts	$	6,707	$	—	$	6,707	$	—		$	6,707
Liabilities
Interest rate contracts	$	6,714	$	—	$	6,714	$	(6,714	)	$	—
Repurchase agreements	$	79,059	$	—	$	79,059	$	(79,059	)	$	—

The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:

	Remaining contractual maturity of the agreements
	Overnight and continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
March 31, 2018	(in thousands)
Class of collateral pledged for repurchase agreements
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	24,247	$	—	$	—	$	—	$	24,247
Gross amount of recognized liabilities for repurchase agreements									24,247
Amounts related to agreements not included in offsetting disclosure									$	—

The collateral utilized for the Company’s repurchase agreements is subject to market fluctuations as well as prepayments of principal. The Company monitors the risk of the fair value of its pledged collateral falling below acceptable amounts based on the type of the underlying repurchase agreement. The pledged collateral related to the Company’s $24.2 million sweep repurchase agreements, which mature on an overnight basis, is monitored on a daily basis as the underlying sweep accounts can have frequent transaction activity and the amount of pledged collateral is adjusted as necessary.

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Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

Commitments and Contingent Liabilities

Lease Commitments: The Company’s lease commitments consist primarily of leased locations under various non-cancellable operating leases that expire between 2018 and 2043. The majority of the leases contain renewal options and provisions for increases in rental rates based on an agreed upon index or predetermined escalation schedule.

Financial Instruments with Off-Balance Sheet Risk: In the normal course of business, the Company makes loan commitments (typically unfunded loans and unused lines of credit) and issues standby letters of credit to accommodate the financial needs of its customers. At March 31, 2018 and December 31, 2017, the Company’s loan commitments amounted to $2.58 billion and $2.62 billion, respectively.

Standby letters of credit commit the Company to make payments on behalf of customers under specified conditions. Historically, no significant losses have been incurred by the Company under standby letters of credit. Both arrangements have credit risk essentially the same as that involved in extending loans to customers and are subject to the Company’s normal credit policies, including collateral requirements, where appropriate. Standby letters of credit were $41.9 million and $51.3 million at March 31, 2018 and December 31, 2017, respectively. In addition, commitments under commercial letters of credit used to facilitate customers’ trade transactions and other off-balance sheet liabilities amounted to $58 thousand and $159 thousand at March 31, 2018 and December 31, 2017, respectively.

Legal Proceedings: The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from their regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Dividends: On January 25, 2018, the Company declared a quarterly cash dividend of $0.22 per common share payable on February 21, 2018 to shareholders of record at the close of business on February 7, 2018.

Subsequent to quarter end, on April 25, 2018, the Company declared a regular quarterly cash dividend of $0.26 per common share payable on May 23, 2018 to shareholders of record at the close of business on May 9, 2018.

The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss) [Abstract]

Accumulated Other Comprehensive Income

Accumulated Other Comprehensive Loss

The following table shows changes in accumulated other comprehensive income (loss) by component for the three month periods ended March 31, 2018 and 2017:

	Unrealized Gains and Losses on Available-for-Sale Securities (1)			Unrealized Gains and Losses on Pension Plan Liability (1)			Total (1)
Three months ended March 31, 2018	(in thousands)
Beginning balance	$	(19,779	)	$	(2,446	)	$	(22,225	)
Adjustment pursuant to adoption of ASU 2016-01	157			—			157
Other comprehensive loss before reclassifications	(26,048		)	—			(26,048		)
Amounts reclassified from accumulated other comprehensive loss	(78		)	61			(17		)
Net current-period other comprehensive income (loss)	(26,126		)	61			(26,065		)
Ending balance	$	(45,748	)	$	(2,385	)	$	(48,133	)
Three months ended March 31, 2017
Beginning balance	$	(12,704	)	$	(6,295	)	$	(18,999	)
Other comprehensive income before reclassifications	1,702			4,604			6,306
Amounts reclassified from accumulated other comprehensive income	—			87			87
Net current-period other comprehensive income	1,702			4,691			6,393
Ending balance	$	(11,002	)	$	(1,604	)	$	(12,606	)

__________

(1) All amounts are net of tax. Amounts in parenthesis indicate debits.

The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the three month periods ended March 31, 2018 and 2017:

	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
	Three Months Ended March 31,						Affected line Item in the Consolidated
	2018			2017			Statement of Income
	(in thousands)
Unrealized gains and losses on available-for-sale securities
Investment securities gains	$	102		$	—		Investment securities gains, net
	102			—			Total before tax
	(24		)	—			Income tax provision
	$	78		$	—		Net of tax
Amortization of pension plan liability
Actuarial losses	$	(80	)	$	(136	)	Compensation and employee benefits
	(80		)	(136		)	Total before tax
	19			49			Income tax benefit
	$	(61	)	$	(87	)	Net of tax

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Fair Value Accounting and Measurement

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Accounting and Measurement

Fair Value Accounting and Measurement

The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available.

The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy:

Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date.

Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable.

Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable.

Fair values are determined as follows:

Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury Notes and equity securities, which are considered a Level 1 input method.

Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy.

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2018 and December 31, 2017 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
March 31, 2018	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,645,218	$	—	$	1,645,218	$	—
State and municipal debt securities	582,748		—		582,748		—
U.S. government agency and government-sponsored enterprise securities	395,832		—		395,832		—
U.S. government securities	247		247		—		—
Total debt securities available for sale	$	2,624,045	$	247	$	2,623,798	$	—
Equity securities	$	5,000	$	5,000	$	—	$	—
Other assets (Interest rate contracts)	$	7,406	$	—	$	7,406	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	7,409	$	—	$	7,409	$	—

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
December 31, 2017	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,726,725	$	—	$	1,726,725	$	—
State and municipal debt securities	596,004		—		596,004		—
U.S. government agency and government-sponsored enterprise securities	414,774		—		414,774		—
U.S. government securities	248		248		—		—
Total debt securities available for sale	$	2,737,751	$	248	$	2,737,503	$	—
Equity securities	$	5,080	$	5,080	$	—	$	—
Other assets (Interest rate contracts)	$	6,707	$	—	$	6,707	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	6,714	$	—	$	6,714	$	—

There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the three month periods ended March 31, 2018 and 2017. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.

Nonrecurring Measurements

Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:

Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the allowance process on a quarterly basis by officers in the Special Credits group, which reports to the Chief Credit Officer. The Real Estate Appraisal Services Department (“REASD”), which also reports to the Chief Credit Officer, is responsible for obtaining appraisals from third-parties or performing internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy and reasonableness.

Other real estate owned—OREO is real property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO is generally measured based on the property’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO is initially recorded at the fair value less estimated costs to sell. This amount becomes the property’s new basis. Any fair value adjustments based on the property’s fair value less estimated costs to sell at the date of acquisition are charged to the allowance, or in the event of a write-up without previous losses charged to the allowance, a credit to earnings is recorded. Management periodically reviews OREO in an effort to ensure the property is recorded at its fair value, net of estimated costs to sell. Any fair value adjustments subsequent to acquisition are charged or credited to earnings. The initial and subsequent evaluations are performed by officers in the Special Credits group, which reports to the Chief Credit Officer. The REASD obtains appraisals from third-parties for OREO and performs internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy and reasonableness.

The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:

	Fair value at March 31, 2018		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2018
			Level 1		Level 2		Level 3
	(in thousands)
Impaired loans	$	7,820	$	—	$	—	$	7,820	$	5,058
OREO	160		—		—		160		51
	$	7,980	$	—	$	—	$	7,980	$	5,109

	Fair value at March 31, 2017		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2017
			Level 1		Level 2		Level 3
	(in thousands)
OREO	$	1,260	$	—	$	—	$	1,260	$	193
	$	1,260	$	—	$	—	$	1,260	$	193

The losses on impaired loans disclosed above represent the amount of the specific reserve and/or charge-offs during the period applicable to loans held at period end. The amount of the specific reserve is included in the allowance for loan and lease losses. The losses on OREO disclosed above represent the write-downs taken at foreclosure that were charged to the allowance for loan and lease losses, as well as subsequent changes in any valuation allowances from updated appraisals that were recorded to earnings.

Quantitative information about Level 3 fair value measurements

The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table:

	Fair value at March 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - collateral-dependent (3)	$	7,512	Fair Market Value of Collateral	Adjustment to Stated Value	0.00% - 100.00% (41.33%)
Impaired loans - other (4)	$	308	Discounted Cash Flow	Discount Rate	6.00%
OREO	$	160	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount rate applied to discounted cash flow valuation or appraisal value and stated value (in the case of accounts receivable, fixed assets, and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values during the current period.
(3) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.
(4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided.

	Fair value at March 31, 2017		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
OREO	$	1,260	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value.
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values.

The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at March 31, 2018 and December 31, 2017:

	March 31, 2018
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	206,532	$	206,532	$	206,532	$	—	$	—
Interest-earning deposits with banks	87,124		87,124		87,124		—		—
Debt securities available for sale	2,624,045		2,624,045		247		2,623,798		—
Equity securities	5,000		5,000		5,000		—		—
FHLB stock	11,640		11,640		—		11,640		—
Loans held for sale	4,312		4,312		—		4,312		—
Loans	8,259,804		8,281,010		—		—		8,281,010
Interest rate contracts	7,406		7,406		—		7,406		—
Liabilities
Deposits	$	474,000	$	465,896	$	—	$	465,896	$	—
FHLB advances	41,564		42,090		—		42,090		—
Repurchase agreements	24,247		24,247		—		24,247		—
Subordinated debentures	35,601		35,486		—		35,486		—
Interest rate contracts	7,409		7,409		—		7,409		—

	December 31, 2017
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	244,615	$	244,615	$	244,615	$	—	$	—
Interest-earning deposits with banks	97,918		97,918		97,918		—		—
Debt securities available for sale	2,737,751		2,737,751		248		2,737,503		—
Equity securities	5,080		5,080		5,080		—		—
FHLB stock	10,440		10,440		—		10,440		—
Loans held for sale	5,766		5,766		—		5,766		—
Loans	8,283,011		8,055,817		—		—		8,055,817
Interest rate contracts	6,707		6,707		—		6,707		—
Liabilities
Deposits	$	10,532,085	$	10,524,135	$	10,041,040	$	483,095	$	—
FHLB advances	11,579		12,281		—		12,281		—
Repurchase agreements	79,059		79,070		—		79,070		—
Subordinated debentures	35,647		35,895		—		35,895		—
Junior subordinated debentures	8,248		8,248		—		8,248		—
Interest rate contracts	6,714		6,714		—		6,714		—

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Earnings per Common Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings per Common Share

The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company issues restricted shares under share-based compensation plans and preferred shares which qualify as participating securities.

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands except per share)
Basic EPS:
Net income	$	39,970	$	29,199
Less: Earnings allocated to participating securities:
Preferred shares	—		3
Nonvested restricted shares	437		397
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Basic earnings per common share	$	0.55	$	0.50
Diluted EPS:
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Dilutive effect of equity awards	5		6
Weighted average diluted common shares outstanding	72,305		57,394
Diluted earnings per common share	$	0.55	$	0.50
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive	12		14

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Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue from Contracts with Customers

Revenue in the scope of Topic 606, Revenue from Contracts with Customers is measured based on the consideration specified in the contract with a customer and excludes amounts collected on behalf of third parties. The vast majority of the Company’s revenue is specifically out of scope of Topic 606. For in-scope revenue, the following is a description of principal activities, separated by the timing of revenue recognition from which the Company generates its revenue from contracts with customers.

a. Revenue earned at a point in time - Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, overdraft fees, interchange fees and foreign exchange transaction fees. Revenue is primarily based on the number and type of transactions and is generally derived from transactional information accumulated by our systems and is recognized immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal.

b. Revenue earned over time - The Company earns revenue from contracts with customers in a variety of ways where the revenue is earned over a period of time - generally monthly. Examples of this type of revenue are deposit account maintenance fees, investment advisory fees, merchant revenue and safe deposit box fees. Revenue is generally derived from transactional information accumulated by our systems or those of third-parties and is recognized as the related transactions occur or services are rendered to the customer.

The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered and our contracts generally do not include multiple performance obligations. As a result, there are no contract balances as payments and services are rendered simultaneously. Payment is generally collected at the time services are rendered, monthly or quarterly. Unsatisfied performance obligations at the report date are not material to our consolidated financial statements.

In certain cases, other parties are involved with providing products and services to our customers. If the Company is principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue.

Rebates, waivers and reversals are recorded as a reduction of the transaction price either when the revenue is recognized by the Company or at the time the rebate, waiver or reversal is earned by the customer.

Practical expedients

The Company applies the practical expedient in paragraph 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service will be one year or less.

The Company pays sales commissions to its employees in accordance with certain incentive plans and in connection with obtaining certain contracts with customer. The Company applies the practical expedient in paragraph 340-40-25-4 and expenses such sales commissions when incurred if the amortization period of the asset the Company otherwise would have recognized is one year or less. Sales commissions are included in compensation and employee benefits expense.

For the Company’s contracts that have an original expected duration of one year or less, the Company uses the practical expedient in paragraph 606-10-50-14 and has not disclosed the amount of the transaction price allocated to unsatisfied performance obligations as of the end of each reporting period or when the Company expects to recognize this revenue.

Disaggregation of revenue

The following table shows the disaggregation of revenue from contracts with customers for the three month period ended March 31, 2018:

	Three Months Ended March 31, 2018
	(dollars in thousands)
Noninterest income:
Revenue from contracts with customers:
Deposit account and treasury management fees	$	8,740
Card revenue	5,813
Financial services and trust revenue	2,730
Total revenue from contracts with customers	17,283
Other sources of noninterest income	5,860
Total noninterest income	$	23,143

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Business Combinations (Tables) - Pacific Continental [Member]

3 Months Ended

Mar. 31, 2018

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:

	November 1, 2017
	(in thousands)
Merger consideration				$	637,103
Identifiable net assets acquired, at fair value
Assets acquired
Cash and cash equivalents	$	81,190
Investment securities	449,291
Federal Home Loan Bank stock	7,084
Loans	1,873,987
Interest receivable	7,827
Premises and equipment	27,343
Other real estate owned	10,279
Core deposit intangible	46,875
Other assets	50,638
Total assets acquired				2,554,514
Liabilities assumed
Deposits	(2,118,982		)
Federal Home Loan Bank advances	(101,127		)
Subordinated debentures	(35,678		)
Junior subordinated debentures	(14,434		)
Securities sold under agreements to repurchase	(1,617		)
Other liabilities	(28,653		)
Total liabilities assumed				(2,300,491		)
Total fair value of identifiable net assets, at fair value				254,023
Goodwill				$	383,080

Business Acquisition, Pro Forma Information [Table Text Block]

For illustrative purposes only, the following table presents certain unaudited pro forma information for the three months ended March 31, 2017. This unaudited estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented.

	Unaudited Pro Forma
	Three Months Ended March 31,
	2017
	(in thousands except per share)
Total revenues (net interest income plus noninterest income)	$	139,363
Net income	$	37,147
Earnings per share - basic	$	0.52
Earnings per share - diluted	$	0.52

Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]

The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Noninterest Expense
Compensation and employee benefits	$	1,556	$	—
Occupancy	1,004		1
Advertising and promotion	512		6
Data processing	287		—
Legal and professional fees	574		1,311
Other	332		46
Total impact of acquisition-related costs to noninterest expense	$	4,265	$	1,364

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Securities (Tables)

3 Months Ended

Mar. 31, 2018

Available-for-sale Securities [Abstract]

Securities Available for Sale

The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,693,149	$	698	$	(48,629	)	$	1,645,218
State and municipal securities	588,218		3,467		(8,937		)	582,748
U.S. government agency and government-sponsored enterprise securities	402,036		43		(6,247		)	395,832
U.S. government securities	251		—		(4		)	247
Total	$	2,683,654	$	4,208	$	(63,817	)	$	2,624,045
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	1,752,236	$	1,815	$	(27,326	)	$	1,726,725
State and municipal securities	593,940		6,023		(3,959		)	596,004
U.S. government agency and government-sponsored enterprise securities	416,894		642		(2,762		)	414,774
U.S. government securities	251		—		(3		)	248
Total	$	2,763,321	$	8,480	$	(34,050	)	$	2,737,751

Schedule of gross realized gains and losses on sales and calls of securities available for sale

The following table provides the proceeds and gross realized gains and losses on sales of debt securities available for sale as well as other securities gains and losses for the periods indicated:

	Three Months Ended
	March 31,
	2018			2017
	(in thousands)
Proceeds from sales of debt securities available for sale	$	19,761		$	—
Gross realized gains from sales of debt securities available for sale	$	148		$	—
Gross realized losses from sales of debt securities available for sale	(46		)	—
Other securities losses, net (1)	(80		)	—
Investment securities gains, net	$	22		$	—

__________

(1) Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.

Schedule of Contractual Maturities of Investment Securities Available for Sale

The scheduled contractual maturities of debt securities available for sale at March 31, 2018 are presented as follows:

	March 31, 2018
	Amortized Cost		Fair Value
	(in thousands)
Due within one year	$	161,538	$	161,314
Due after one year through five years	635,254		626,693
Due after five years through ten years	756,950		737,927
Due after ten years	1,129,912		1,098,111
Total debt securities available for sale	$	2,683,654	$	2,624,045

Carrying Value of Securities Pledged As Collateral

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

	March 31, 2018
	(in thousands)
Washington and Oregon State to secure public deposits	$	246,950
Federal Reserve Bank to secure borrowings	52,754
Other securities pledged	102,363
Total securities pledged as collateral	$	402,067

Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses

The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2018 and December 31, 2017:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
March 31, 2018
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	921,993	$	(19,073	)	$	681,577	$	(29,556	)	$	1,603,570	$	(48,629	)
State and municipal securities	315,392		(4,972		)	76,452		(3,965		)	391,844		(8,937		)
U.S. government agency and government-sponsored enterprise securities	251,626		(3,969		)	140,455		(2,278		)	392,081		(6,247		)
U.S. government securities	247		(4		)	—		—			247		(4		)
Total	$	1,489,258	$	(28,018	)	$	898,484	$	(35,799	)	$	2,387,742	$	(63,817	)
December 31, 2017
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	816,678	$	(6,710	)	$	717,211	$	(20,616	)	$	1,533,889	$	(27,326	)
State and municipal securities	220,019		(1,723		)	75,172		(2,236		)	295,191		(3,959		)
U.S. government agency and government-sponsored enterprise securities	184,046		(1,006		)	155,983		(1,756		)	340,029		(2,762		)
U.S. government securities	249		(3		)	—		—			249		(3		)
Total	$	1,220,992	$	(9,442	)	$	948,366	$	(24,608	)	$	2,169,358	$	(34,050	)

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Loans (Tables)

3 Months Ended

Mar. 31, 2018

Financing Receivable, Recorded Investment [Line Items]

Analysis of Loan Portfolio by Major Types of Loans

The following is an analysis of the loan portfolio by segment (net of unearned income):

	March 31, 2018									December 31, 2017
	Loans, excluding PCI loans			PCI Loans			Total			Loans, excluding PCI loans			PCI Loans			Total
	(in thousands)
Commercial business	$	3,402,162		$	13,536		$	3,415,698		$	3,377,324		$	12,628		$	3,389,952
Real estate:
One-to-four family residential	182,302			10,684			192,986			188,396			12,395			200,791
Commercial and multifamily residential	3,776,709			73,446			3,850,155			3,825,739			75,594			3,901,333
Total real estate	3,959,011			84,130			4,043,141			4,014,135			87,989			4,102,124
Real estate construction:
One-to-four family residential	208,441			171			208,612			200,518			177			200,695
Commercial and multifamily residential	385,339			611			385,950			371,931			607			372,538
Total real estate construction	593,780			782			594,562			572,449			784			573,233
Consumer	323,631			10,851			334,482			334,190			11,269			345,459
Less: Net unearned income	(48,252		)	—			(48,252		)	(52,111		)	—			(52,111		)
Total loans, net of unearned income	8,230,332			109,299			8,339,631			8,245,987			112,670			8,358,657
Less: Allowance for loan and lease losses	(74,162		)	(5,665		)	(79,827		)	(68,739		)	(6,907		)	(75,646		)
Total loans, net	$	8,156,170		$	103,634		$	8,259,804		$	8,177,248		$	105,763		$	8,283,011
Loans held for sale	$	4,312		$	—		$	4,312		$	5,766		$	—		$	5,766

Loans, Excluding Purchased Credit Impaired Loans [Member]

Financing Receivable, Recorded Investment [Line Items]

Analysis of Nonaccrual Loans

The following is an analysis of nonaccrual loans as of March 31, 2018 and December 31, 2017:

	March 31, 2018				December 31, 2017
	Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans		Recorded Investment Nonaccrual Loans		Unpaid Principal Balance Nonaccrual Loans
	(in thousands)
Commercial business:
Secured	$	57,504	$	69,056	$	45,410	$	56,865
Unsecured	115		115		50		49
Real estate:
One-to-four family residential	1,054		1,426		785		1,182
Commercial & multifamily residential:
Commercial land	3,192		3,201		2,628		2,623
Income property	3,980		4,264		4,284		5,410
Owner occupied	7,367		7,621		7,029		7,270
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		25		26
Residential construction	1,210		1,210		1,829		1,828
Consumer	4,042		4,378		4,149		4,633
Total	$	78,464	$	91,271	$	66,189	$	79,886

Analysis of the Aged Loan Portfolio

The following is an aging of the recorded investment of the loan portfolio as of March 31, 2018 and December 31, 2017:

	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,189,473	$	16,410	$	2,872	$	—	$	19,282	$	57,504	$	3,266,259
Unsecured	119,863		50		51		—		101		115		120,079
Real estate:
One-to-four family residential	179,174		340		—		—		340		1,054		180,568
Commercial & multifamily residential:
Commercial land	283,973		2,299		—		—		2,299		3,192		289,464
Income property	1,867,450		1,929		815		—		2,744		3,980		1,874,174
Owner occupied	1,570,051		10,751		2,772		—		13,523		7,367		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	5,937		318		285		—		603		—		6,540
Residential construction	199,756		112		—		—		112		1,210		201,078
Commercial & multifamily residential:
Income property	295,067		11,070		—		—		11,070		—		306,137
Owner occupied	73,016		—		—		—		—		—		73,016
Consumer	316,557		1,229		248		—		1,477		4,042		322,076
Total	$	8,100,317	$	44,508	$	7,043	$	—	$	51,551	$	78,464	$	8,230,332
	Current Loans		30 - 59 Days Past Due		60 - 89 Days Past Due		Greater than 90 Days Past Due		Total Past Due		Nonaccrual Loans		Total Loans
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,185,321	$	2,530	$	2,400	$	—	$	4,930	$	45,410	$	3,235,661
Unsecured	123,524		100		501		—		601		50		124,175
Real estate:
One-to-four family residential	184,256		1,111		402		—		1,513		785		186,554
Commercial & multifamily residential:
Commercial land	292,680		92		—		581		673		2,628		295,981
Income property	1,898,655		2,426		971		—		3,397		4,284		1,906,336
Owner occupied	1,590,004		2,485		468		—		2,953		7,029		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		—		—		—		25		9,907
Residential construction	187,862		—		—		—		—		1,829		189,691
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		293,028
Owner occupied	72,443		—		—		—		—		—		72,443
Consumer	325,928		1,446		702		—		2,148		4,149		332,225
Total	$	8,163,583	$	10,190	$	5,444	$	581	$	16,215	$	66,189	$	8,245,987

Impaired Financing Receivables

The following is an analysis of impaired loans as of March 31, 2018 and December 31, 2017:

	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
March 31, 2018	(in thousands)
Commercial business:
Secured	$	3,221,659	$	44,600	$	13,836	$	18,931	$	5,657	$	30,764	$	33,785
Unsecured	120,056		23		23		23		2		—		—
Real estate:
One-to-four family residential	179,700		868		428		715		22		440		1,017
Commercial & multifamily residential:
Commercial land	286,613		2,851		—		—		—		2,851		2,860
Income property	1,870,614		3,560		—		—		—		3,560		3,623
Owner occupied	1,582,385		8,556		3,399		4,821		5		5,157		5,269
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		—		—
Residential construction	199,868		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	306,137		—		—		—		—		—		—
Owner occupied	68,966		4,050		—		—		—		4,050		4,050
Consumer	315,845		6,231		5,439		5,707		171		792		860
Total	$	8,158,383	$	71,949	$	23,125	$	30,197	$	5,857	$	48,824	$	52,674
	Recorded Investment of Loans Collectively Measured for Contingency Provision		Recorded Investment of Loans Individually Measured for Specific Impairment		Impaired Loans With Recorded Allowance						Impaired Loans Without Recorded Allowance
					Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance
December 31, 2017	(in thousands)
Commercial business:
Secured	$	3,195,649	$	40,012	$	3,808	$	3,937	$	1,867	$	36,204	$	42,314
Unsecured	124,150		25		25		24		3		—		—
Real estate:
One-to-four family residential	185,659		895		867		1,408		103		28		337
Commercial & multifamily residential:
Commercial land	293,694		2,287		—		—		—		2,287		2,282
Income property	1,901,313		5,023		2,768		3,328		185		2,255		2,601
Owner occupied	1,591,298		8,688		77		80		3		8,611		10,077
Real estate construction:
One-to-four family residential:
Land and acquisition	9,907		—		—		—		—		—		—
Residential construction	188,481		1,210		—		—		—		1,210		1,210
Commercial & multifamily residential:
Income property	293,028		—		—		—		—		—		—
Owner occupied	68,393		4,050		—		—		—		4,050		4,050
Consumer	325,210		7,015		5,303		5,568		199		1,712		1,864
Total	$	8,176,782	$	69,205	$	12,848	$	14,345	$	2,360	$	56,357	$	64,735

The following table provides additional information on impaired loans for the three month periods indicated:

	Three Months Ended March 31,
	2018				2017
	Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans		Average Recorded Investment Impaired Loans		Interest Recognized on Impaired Loans
	(in thousands)
Commercial business:
Secured	$	42,306	$	12	$	8,303	$	19
Unsecured	24		—		—		—
Real estate:
One-to-four family residential	881		7		521		2
Commercial & multifamily residential:
Commercial land	2,569		—		1,504		—
Income property	4,292		31		4,059		1
Owner occupied	8,622		84		4,462		—
Real estate construction:
One-to-four family residential:
Land and acquisition	—		—		7		—
Residential construction	1,210		—		168		—
Commercial & multifamily residential:
Owner occupied	4,050		51		—		—
Consumer	6,623		54		5,370		27
Total	$	70,577	$	239	$	24,394	$	49

Analysis of loans classified as Troubled Debt Restructurings (“TDR”)

The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three months ended March 31, 2018 and 2017:

	Three months ended March 31, 2018					Three months ended March 31, 2017
	Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of TDR Modifications	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
	(dollars in thousands)
Commercial business:
Secured	1	$	450	$	450	3	$	356	$	356
Real estate:
Commercial and multifamily residential:
Income property	1	891		891		—	—		—
Consumer	7	1,143		1,143		10	1,546		1,546
Total	9	$	2,484	$	2,484	13	$	1,902	$	1,902

Purchased Credit Impaired Loans [Member]

Financing Receivable, Recorded Investment [Line Items]

Analysis of Loan Portfolio by Major Types of Loans

The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
	(in thousands)
Commercial business	$	14,201	$	13,753
Real estate:
One-to-four family residential	12,738		14,610
Commercial and multifamily residential	77,400		79,211
Total real estate	90,138		93,821
Real estate construction:
One-to-four family residential	171		177
Commercial and multifamily residential	589		595
Total real estate construction	760		772
Consumer	11,989		12,412
Subtotal of PCI loans	117,088		120,758
Less:
Valuation discount resulting from acquisition accounting	7,789		8,088
Allowance for loan losses	5,665		6,907
PCI loans, net of allowance for loan losses	$	103,634	$	105,763

Changes in Accretable Yield for Acquired Loans

The following table shows the changes in accretable yield for PCI loans for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance at beginning of period	$	31,176		$	45,191
Accretion	(2,265		)	(4,182		)
Disposals	(159		)	(158		)
Reclassifications from (to) nonaccretable difference	603			(2,407		)
Balance at end of period	$	29,355		$	38,444

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Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)

3 Months Ended

Mar. 31, 2018

Financing Receivable, Allowance for Credit Losses [Line Items]

Allowance for Credit Losses on Financing Receivables

The following tables show a detailed analysis of the allowance for the three months ended March 31, 2018 and 2017:

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2018	(in thousands)
Commercial business:
Secured	$	29,341	$	(2,414	)	$	553	$	9,851		$	37,331	$	5,657	$	31,674
Unsecured	2,000		(63		)	249		409			2,595		2		2,593
Real estate:
One-to-four family residential	701		—			172		(315		)	558		22		536
Commercial & multifamily residential:
Commercial land	4,265		—			6		(526		)	3,745		—		3,745
Income property	5,672		(223		)	141		(888		)	4,702		—		4,702
Owner occupied	5,459		—			12		(722		)	4,749		5		4,744
Real estate construction:
One-to-four family residential:
Land and acquisition	963		—			16		(67		)	912		—		912
Residential construction	3,709		—			3		924			4,636		—		4,636
Commercial & multifamily residential:
Income property	7,053		—			—		421			7,474		—		7,474
Owner occupied	4,413		—			—		(2,490		)	1,923		—		1,923
Consumer	5,163		(264		)	260		57			5,216		171		5,045
Purchased credit impaired	6,907		(1,343		)	1,224		(1,123		)	5,665		—		5,665
Unallocated	—		—			—		321			321		—		321
Total	$	75,646	$	(4,307	)	$	2,636	$	5,852		$	79,827	$	5,857	$	73,970

	Beginning Balance		Charge-offs			Recoveries		Provision (Recovery)			Ending Balance		Specific Reserve		General Allocation
Three months ended March 31, 2017	(in thousands)
Commercial business:
Secured	$	36,050	$	(1,109	)	$	297	$	434		$	35,672	$	—	$	35,672
Unsecured	960		(18		)	68		178			1,188		—		1,188
Real estate:
One-to-four family residential	599		(307		)	117		236			645		11		634
Commercial & multifamily residential:
Commercial land	1,797		—			—		491			2,288		—		2,288
Income property	7,342		—			35		(574		)	6,803		26		6,777
Owner occupied	6,439		—			43		52			6,534		—		6,534
Real estate construction:
One-to-four family residential:
Land and acquisition	316		(14		)	20		187			509		—		509
Residential construction	669		—			9		431			1,109		—		1,109
Commercial & multifamily residential:
Income property	404		—			—		378			782		—		782
Owner occupied	1,192		—			—		576			1,768		—		1,768
Consumer	3,534		(428		)	285		(31		)	3,360		57		3,303
Purchased credit impaired	10,515		(1,939		)	1,144		(325		)	9,395		—		9,395
Unallocated	226		—			—		742			968		—		968
Total	$	70,043	$	(3,815	)	$	2,018	$	2,775		$	71,021	$	94	$	70,927

Changes in the Allowance for Unfunded Commitments and Letters of Credit

Changes in the allowance for unfunded commitments and letters of credit, a component of “Other liabilities” in the Consolidated Balance Sheets, are summarized as follows:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands)
Balance at beginning of period	$	3,130	$	2,705
Net changes in the allowance for unfunded commitments and letters of credit	1,200		850
Balance at end of period	$	4,330	$	3,555

Financing Receivable Credit Quality Indicators

The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans, as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,067,417	$	47,672	$	151,170	$	—	$	—	$	3,266,259
Unsecured	119,416		—		663		—		—		120,079
Real estate:
One-to-four family residential	177,122		1,208		2,238		—		—		180,568
Commercial and multifamily residential:
Commercial land	279,949		1,288		8,227		—		—		289,464
Income property	1,837,613		19,863		16,698		—		—		1,874,174
Owner occupied	1,542,605		8,986		39,350		—		—		1,590,941
Real estate construction:
One-to-four family residential:
Land and acquisition	6,540		—		—		—		—		6,540
Residential construction	199,868		—		1,210		—		—		201,078
Commercial and multifamily residential:
Income property	303,079		—		3,058		—		—		306,137
Owner occupied	67,672		—		5,344		—		—		73,016
Consumer	314,223		—		7,853		—		—		322,076
Total	$	7,915,504	$	79,017	$	235,811	$	—	$	—	8,230,332
Less:
Allowance for loan and lease losses											74,162
Loans, excluding PCI loans, net											$	8,156,170

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
Loans, excluding PCI loans:
Commercial business:
Secured	$	3,049,031	$	64,600	$	122,030	$	—	$	—	$	3,235,661
Unsecured	123,621		—		554		—		—		124,175
Real estate:
One-to-four family residential	183,312		1,186		2,056		—		—		186,554
Commercial and multifamily residential:
Commercial land	283,673		5,204		7,104		—		—		295,981
Income property	1,857,832		17,181		31,323		—		—		1,906,336
Owner occupied	1,546,775		7,380		45,831		—		—		1,599,986
Real estate construction:
One-to-four family residential:
Land and acquisition	9,882		—		25		—		—		9,907
Residential construction	187,863		—		1,828		—		—		189,691
Commercial and multifamily residential:
Income property	293,028		—		—		—		—		293,028
Owner occupied	68,393		—		4,050		—		—		72,443
Consumer	323,129		—		9,096		—		—		332,225
Total	$	7,926,539	$	95,551	$	223,897	$	—	$	—	8,245,987
Less:
Allowance for loan and lease losses											68,739
Loans, excluding PCI loans, net											$	8,177,248

The following is an analysis of the credit quality of our PCI loan portfolio as of March 31, 2018 and December 31, 2017:

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
March 31, 2018	(in thousands)
PCI loans:
Commercial business:
Secured	$	12,582	$	—	$	728	$	—	$	—	$	13,310
Unsecured	891		—		—		—		—		891
Real estate:
One-to-four family residential	11,967		—		771		—		—		12,738
Commercial and multifamily residential:
Commercial land	12,223		—		—		—		—		12,223
Income property	22,384		—		—		—		—		22,384
Owner occupied	41,874		—		919		—		—		42,793
Real estate construction:
One-to-four family residential:
Land and acquisition	164		—		7		—		—		171
Commercial and multifamily residential:
Income property	589		—		—		—		—		589
Consumer	11,514		—		475		—		—		11,989
Total	$	114,188	$	—	$	2,900	$	—	$	—	117,088
Less:
Valuation discount resulting from acquisition accounting											7,789
Allowance for loan losses											5,665
PCI loans, net											$	103,634

	Pass		Special Mention		Substandard		Doubtful		Loss		Total
December 31, 2017	(in thousands)
PCI loans:
Commercial business:
Secured	$	11,918	$	—	$	723	$	—	$	—	$	12,641
Unsecured	1,045		—		67		—		—		1,112
Real estate:
One-to-four family residential	13,817		—		793		—		—		14,610
Commercial and multifamily residential:
Commercial land	9,460		349		—		—		—		9,809
Income property	25,981		—		35		—		—		26,016
Owner occupied	42,617		—		769		—		—		43,386
Real estate construction:
One-to-four family residential:
Land and acquisition	169		—		8		—		—		177
Commercial and multifamily residential:
Income property	595		—		—		—		—		595
Consumer	11,705		—		707		—		—		12,412
Total	$	117,307	$	349	$	3,102	$	—	$	—	120,758
Less:
Valuation discount resulting from acquisition accounting											8,088
Allowance for loan losses											6,907
PCI loans, net											$	105,763

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Other Real Estate Owned (Tables)

3 Months Ended

Mar. 31, 2018

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Summary of Other Real Estate Owned

The following tables set forth activity in OREO for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Balance, beginning of period	$	13,298		$	5,998
Transfers in	406			—
Valuation adjustments	(92		)	(193		)
Proceeds from sale of OREO property	(2,062		)	(1,275		)
Loss on sale of OREO, net	(43		)	(11		)
Balance, end of period	$	11,507		$	4,519

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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

The following table sets forth activity for goodwill and other intangible assets for the periods indicated:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Goodwill
Total goodwill (1)	$	765,842		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	105,473			58,598
Accumulated amortization at beginning of period	(48,219		)	(41,886		)
Core deposit intangible, net at beginning of period	57,254			16,712
CDI current period amortization	(3,188		)	(1,349		)
Total core deposit intangible, net at end of period	54,066			15,363
Intangible assets not subject to amortization	919			919
Other intangible assets, net at end of period	54,985			16,282
Total goodwill and other intangible assets at end of period	$	820,827		$	399,044

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2018 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2018	$	9,048
2019	10,479
2020	8,724
2021	7,264
2022	5,880

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Derivatives and Balance Sheet Offsetting (Tables)

3 Months Ended

Mar. 31, 2018

Derivative [Line Items]

Balance Sheet Offsetting [Table Text Block]

The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.

	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Collateral Posted			Net Amount
March 31, 2018	(in thousands)
Assets
Interest rate contracts	$	7,406	$	—	$	7,406	$	—		$	7,406
Liabilities
Interest rate contracts	$	7,409	$	—	$	7,409	$	(1,190	)	$	6,219
Repurchase agreements	$	24,247	$	—	$	24,247	$	(24,247	)	$	—
December 31, 2017
Assets
Interest rate contracts	$	6,707	$	—	$	6,707	$	—		$	6,707
Liabilities
Interest rate contracts	$	6,714	$	—	$	6,714	$	(6,714	)	$	—
Repurchase agreements	$	79,059	$	—	$	79,059	$	(79,059	)	$	—

Carrying Value of Securities Pledged As Collateral

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:

	March 31, 2018
	(in thousands)
Washington and Oregon State to secure public deposits	$	246,950
Federal Reserve Bank to secure borrowings	52,754
Other securities pledged	102,363
Total securities pledged as collateral	$	402,067

Not Designated as Hedging Instrument [Member]

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the fair value of derivatives not designated as hedging instruments at March 31, 2018 and December 31, 2017:

Asset Derivatives

Liability Derivatives

March 31, 2018

December 31, 2017

March 31, 2018

December 31, 2017

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

Balance Sheet Location

Fair Value

(in thousands)

Interest rate contracts

Other assets

$

7,406

Other assets

$

6,707

Other liabilities

$

7,409

Other liabilities

$

6,714

Available-for-sale Securities [Member]

Derivative [Line Items]

Carrying Value of Securities Pledged As Collateral

The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements:

	Remaining contractual maturity of the agreements
	Overnight and continuous		Up to 30 days		30 - 90 days		Greater than 90 days		Total
March 31, 2018	(in thousands)
Class of collateral pledged for repurchase agreements
U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	24,247	$	—	$	—	$	—	$	24,247
Gross amount of recognized liabilities for repurchase agreements									24,247
Amounts related to agreements not included in offsetting disclosure									$	—

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss) [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table shows changes in accumulated other comprehensive income (loss) by component for the three month periods ended March 31, 2018 and 2017:

	Unrealized Gains and Losses on Available-for-Sale Securities (1)			Unrealized Gains and Losses on Pension Plan Liability (1)			Total (1)
Three months ended March 31, 2018	(in thousands)
Beginning balance	$	(19,779	)	$	(2,446	)	$	(22,225	)
Adjustment pursuant to adoption of ASU 2016-01	157			—			157
Other comprehensive loss before reclassifications	(26,048		)	—			(26,048		)
Amounts reclassified from accumulated other comprehensive loss	(78		)	61			(17		)
Net current-period other comprehensive income (loss)	(26,126		)	61			(26,065		)
Ending balance	$	(45,748	)	$	(2,385	)	$	(48,133	)
Three months ended March 31, 2017
Beginning balance	$	(12,704	)	$	(6,295	)	$	(18,999	)
Other comprehensive income before reclassifications	1,702			4,604			6,306
Amounts reclassified from accumulated other comprehensive income	—			87			87
Net current-period other comprehensive income	1,702			4,691			6,393
Ending balance	$	(11,002	)	$	(1,604	)	$	(12,606	)

__________

(1) All amounts are net of tax. Amounts in parenthesis indicate debits.

Schedule of reclassifications from accumulated other comprehensive income [Table Text Block]

The following table shows details regarding the reclassifications from accumulated other comprehensive income (loss) for the three month periods ended March 31, 2018 and 2017:

	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
	Three Months Ended March 31,						Affected line Item in the Consolidated
	2018			2017			Statement of Income
	(in thousands)
Unrealized gains and losses on available-for-sale securities
Investment securities gains	$	102		$	—		Investment securities gains, net
	102			—			Total before tax
	(24		)	—			Income tax provision
	$	78		$	—		Net of tax
Amortization of pension plan liability
Actuarial losses	$	(80	)	$	(136	)	Compensation and employee benefits
	(80		)	(136		)	Total before tax
	19			49			Income tax benefit
	$	(61	)	$	(87	)	Net of tax

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Fair Value Accounting and Measurement (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Financial Assets And Liabilities Accounted For Fair Value On Recurring Basis

The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2018 and December 31, 2017 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
March 31, 2018	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,645,218	$	—	$	1,645,218	$	—
State and municipal debt securities	582,748		—		582,748		—
U.S. government agency and government-sponsored enterprise securities	395,832		—		395,832		—
U.S. government securities	247		247		—		—
Total debt securities available for sale	$	2,624,045	$	247	$	2,623,798	$	—
Equity securities	$	5,000	$	5,000	$	—	$	—
Other assets (Interest rate contracts)	$	7,406	$	—	$	7,406	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	7,409	$	—	$	7,409	$	—

	Fair value		Fair Value Measurements at Reporting Date Using
			Level 1		Level 2		Level 3
December 31, 2017	(in thousands)
Assets
Debt securities available for sale:
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	1,726,725	$	—	$	1,726,725	$	—
State and municipal debt securities	596,004		—		596,004		—
U.S. government agency and government-sponsored enterprise securities	414,774		—		414,774		—
U.S. government securities	248		248		—		—
Total debt securities available for sale	$	2,737,751	$	248	$	2,737,503	$	—
Equity securities	$	5,080	$	5,080	$	—	$	—
Other assets (Interest rate contracts)	$	6,707	$	—	$	6,707	$	—
Liabilities
Other liabilities (Interest rate contracts)	$	6,714	$	—	$	6,714	$	—

Financial Assets Accounted For Fair Value On Nonrecurring Basis

The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:

	Fair value at March 31, 2018		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2018
			Level 1		Level 2		Level 3
	(in thousands)
Impaired loans	$	7,820	$	—	$	—	$	7,820	$	5,058
OREO	160		—		—		160		51
	$	7,980	$	—	$	—	$	7,980	$	5,109

	Fair value at March 31, 2017		Fair Value Measurements at Reporting Date Using						Losses During the Three Months Ended March 31, 2017
			Level 1		Level 2		Level 3
	(in thousands)
OREO	$	1,260	$	—	$	—	$	1,260	$	193
	$	1,260	$	—	$	—	$	1,260	$	193

Fair Value, by Balance Sheet Grouping

The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at March 31, 2018 and December 31, 2017:

	March 31, 2018
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	206,532	$	206,532	$	206,532	$	—	$	—
Interest-earning deposits with banks	87,124		87,124		87,124		—		—
Debt securities available for sale	2,624,045		2,624,045		247		2,623,798		—
Equity securities	5,000		5,000		5,000		—		—
FHLB stock	11,640		11,640		—		11,640		—
Loans held for sale	4,312		4,312		—		4,312		—
Loans	8,259,804		8,281,010		—		—		8,281,010
Interest rate contracts	7,406		7,406		—		7,406		—
Liabilities
Deposits	$	474,000	$	465,896	$	—	$	465,896	$	—
FHLB advances	41,564		42,090		—		42,090		—
Repurchase agreements	24,247		24,247		—		24,247		—
Subordinated debentures	35,601		35,486		—		35,486		—
Interest rate contracts	7,409		7,409		—		7,409		—

	December 31, 2017
	Carrying Amount		Fair Value		Level 1		Level 2		Level 3
	(in thousands)
Assets
Cash and due from banks	$	244,615	$	244,615	$	244,615	$	—	$	—
Interest-earning deposits with banks	97,918		97,918		97,918		—		—
Debt securities available for sale	2,737,751		2,737,751		248		2,737,503		—
Equity securities	5,080		5,080		5,080		—		—
FHLB stock	10,440		10,440		—		10,440		—
Loans held for sale	5,766		5,766		—		5,766		—
Loans	8,283,011		8,055,817		—		—		8,055,817
Interest rate contracts	6,707		6,707		—		6,707		—
Liabilities
Deposits	$	10,532,085	$	10,524,135	$	10,041,040	$	483,095	$	—
FHLB advances	11,579		12,281		—		12,281		—
Repurchase agreements	79,059		79,070		—		79,070		—
Subordinated debentures	35,647		35,895		—		35,895		—
Junior subordinated debentures	8,248		8,248		—		8,248		—
Interest rate contracts	6,714		6,714		—		6,714		—

Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value Inputs, Assets, Quantitative Information

The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table:

	Fair value at March 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
Impaired loans - collateral-dependent (3)	$	7,512	Fair Market Value of Collateral	Adjustment to Stated Value	0.00% - 100.00% (41.33%)
Impaired loans - other (4)	$	308	Discounted Cash Flow	Discount Rate	6.00%
OREO	$	160	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount rate applied to discounted cash flow valuation or appraisal value and stated value (in the case of accounts receivable, fixed assets, and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values during the current period.
(3) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.
(4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided.

	Fair value at March 31, 2017		Valuation Technique	Unobservable Input	Range (Weighted Average) (1)
	(dollars in thousands)
OREO	$	1,260	Fair Market Value of Collateral	Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value.
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values.

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Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017:

	Three Months Ended
	March 31,
	2018		2017
	(in thousands except per share)
Basic EPS:
Net income	$	39,970	$	29,199
Less: Earnings allocated to participating securities:
Preferred shares	—		3
Nonvested restricted shares	437		397
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Basic earnings per common share	$	0.55	$	0.50
Diluted EPS:
Earnings allocated to common shareholders	$	39,533	$	28,799
Weighted average common shares outstanding	72,300		57,388
Dilutive effect of equity awards	5		6
Weighted average diluted common shares outstanding	72,305		57,394
Diluted earnings per common share	$	0.55	$	0.50
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive	12		14

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Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2018

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

Disaggregation of revenue

The following table shows the disaggregation of revenue from contracts with customers for the three month period ended March 31, 2018:

	Three Months Ended March 31, 2018
	(dollars in thousands)
Noninterest income:
Revenue from contracts with customers:
Deposit account and treasury management fees	$	8,740
Card revenue	5,813
Financial services and trust revenue	2,730
Total revenue from contracts with customers	17,283
Other sources of noninterest income	5,860
Total noninterest income	$	23,143

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Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (46)
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 67
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (203)
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		(117)
Common Stock [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 184

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Business Combinations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Nov. 01, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Threshold for average assets requiring CFPB examination		$ 10,000,000
Estimated pre-tax annual impact of no longer qualifying for the small issuer exemption from interchange fee cap		10,000
Pacific Continental [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		4,265	$ 1,364
Business Acquisition, Pro Forma Revenue			139,363
Business Combination, Consideration Transferred	$ 637,103
Business Acquisition, Effective Date of Acquisition	Nov. 01, 2017
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Purchase Price Allocation, Goodwill Amount	$ 383,080
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets	46,875
Business Combination, Purchase Price Allocation, Other Assets	50,638
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	2,554,514
Business Combination, Purchase Price Allocation, Liabilities, Deposits	(2,118,982)
Business Combination, Purchase Price Allocation, Federal Home Loan bank advances	(101,127)
Business Combination, Purchase Price Allocation, Subordinated Debt	(35,678)
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures	(14,434)
Business combination, purchase price allocation, securities sold under agreements to repurchase	(1,617)
Business Combination, Purchase Price Allocation, Other Liabilities	(28,653)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(2,300,491)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 254,023
business combinations, core deposit intangible percentage of core deposits	2.34%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 81,190
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	449,291
Business Combination, Purchase Price Allocation, FHLB Stock	7,084
Business Combination, Acquired Receivable, Fair Value	1,873,987
Business Combination, Purchase Price Allocation, Accrued Interest Receivable	7,827
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	27,343
Business Combination, Purchase Price Allocation, Other Real Estate Owned	$ 10,279
Business Acquisition, Pro Forma Net Income (Loss)			$ 37,147
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 0.52
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 0.52
Pacific Continental [Member] | Compensation and employee benefits [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		1,556	$ 0
Pacific Continental [Member] | Other noninterest expenses [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		332	46
Pacific Continental [Member] | Legal and professional fees [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		574	1,311
Pacific Continental [Member] | Data processing [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		287	0
Pacific Continental [Member] | Advertising and promotion [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		512	6
Pacific Continental [Member] | Occupancy [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		$ 1,004	$ 1

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Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 19,761	$ 0
Securities available-for-sale, amortized cost	2,683,654		$ 2,763,321
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	4,208		8,480
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	63,817		34,050
Available-for-sale Securities, Debt Securities	2,624,045		2,737,751
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	1,693,149		1,752,236
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	698		1,815
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	48,629		27,326
Available-for-sale Securities, Debt Securities	1,645,218		1,726,725
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	588,218		593,940
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3,467		6,023
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	8,937		3,959
Available-for-sale Securities, Debt Securities	582,748		596,004
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	402,036		416,894
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	43		642
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	6,247		2,762
Available-for-sale Securities, Debt Securities	395,832		414,774
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	251		251
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0		0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	4		3
Available-for-sale Securities, Debt Securities	$ 247		$ 248

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Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities [Abstract]
Due within one year, Amortized Cost	$ 161,538
Due after one year through five years, Amortized Cost	635,254
Due after five years through ten years, Amortized Cost	756,950
Due after ten years, Amortized Cost	1,129,912
Securities available-for-sale, amortized cost	2,683,654	$ 2,763,321
Due within one year, Fair Value	161,314
Due after one year through five years, Fair Value	626,693
Due after five years through ten years, Fair Value	737,927
Due after ten years, Fair Value	1,098,111
Total investment securities available-for-sale, Fair Value	$ 2,624,045	$ 2,737,751

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Securities (Carrying Value of Securities Pledged as Collateral) (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	$ 402,067
Washington and Oregon State Public Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	246,950
Federal Reserve Bank Advances [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	52,754
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	$ 102,363

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Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	$ 1,489,258	$ 1,220,992
Less than 12 Months Unrealized Losses	(28,018)	(9,442)
12 Months or More Fair Value	898,484	948,366
12 Months or More Unrealized Losses	(35,799)	(24,608)
Total Fair Value	2,387,742	2,169,358
Total Unrealized Losses	(63,817)	(34,050)
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	921,993	816,678
Less than 12 Months Unrealized Losses	(19,073)	(6,710)
12 Months or More Fair Value	681,577	717,211
12 Months or More Unrealized Losses	(29,556)	(20,616)
Total Fair Value	1,603,570	1,533,889
Total Unrealized Losses	(48,629)	(27,326)
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	315,392	220,019
Less than 12 Months Unrealized Losses	(4,972)	(1,723)
12 Months or More Fair Value	76,452	75,172
12 Months or More Unrealized Losses	(3,965)	(2,236)
Total Fair Value	391,844	295,191
Total Unrealized Losses	(8,937)	(3,959)
US Government Corporations and Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	251,626	184,046
Less than 12 Months Unrealized Losses	(3,969)	(1,006)
12 Months or More Fair Value	140,455	155,983
12 Months or More Unrealized Losses	(2,278)	(1,756)
Total Fair Value	392,081	340,029
Total Unrealized Losses	(6,247)	(2,762)
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	247	249
Less than 12 Months Unrealized Losses	(4)	(3)
12 Months or More Fair Value	0	0
12 Months or More Unrealized Losses	0	0
Total Fair Value	247	249
Total Unrealized Losses	$ (4)	$ (3)

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Securities (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) security	Mar. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $	$ 19,761	$ 0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	446
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	117
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	406
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	71
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	50
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	16
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities In Continuous Loss Position For Twelve Months or More	0
Number Of Securities In Unrealized Loss Position	1

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Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds		$ 19,761	$ 0
Available-for-sale Securities, Gross Realized Gains		148	0
Available-for-sale Securities, Gross Realized Losses		(46)	0
Equity Securities, FV-NI, Unrealized Gain (Loss)	[1]	(80)	0
Gain (Loss) on Investments		$ 22	$ 0

[1] Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.

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Loans (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 contract	Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans to related parties	$ 9,900		$ 10,000
Loans and Leases Receivable, Related Parties, Additions	0
Repayments on related party loans	$ 86
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 2,280,000		2,250,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 72,500		$ 70,200

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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	$ (48,252)	$ (52,111)
Recorded Investment	8,339,631	8,358,657
Allowance for loan losses	(79,827)	(75,646)	$ (71,021)	$ (70,043)
Loans, net	8,259,804	8,283,011
Loans held for sale	4,312	5,766
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	(48,252)	(52,111)
Recorded Investment	8,230,332	8,245,987
Allowance for loan losses	(74,162)	(68,739)
Loans, net	8,156,170	8,177,248
Loans held for sale	4,312	5,766
Loans and Leases Receivable, Gross	8,230,332	8,245,987
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	0	0
Recorded Investment	109,299	112,670
Allowance for loan losses	(5,665)	(6,907)
Loans, net	103,634	105,763
Loans held for sale	0	0
Loans and Leases Receivable, Gross	117,088	120,758
Acquisition Accounting Valuation Discount on Covered Loans	7,789	8,088
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	589	595
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	192,986	200,791
Loans and Leases Receivable, Gross, Consumer, Construction	208,612	200,695
Allowance for loan losses	(558)	(701)	(645)	(599)
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	182,302	188,396
Loans and Leases Receivable, Gross, Consumer, Construction	208,441	200,518
Loans and Leases Receivable, Gross	180,568	186,554
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	10,684	12,395
Loans and Leases Receivable, Gross, Consumer, Construction	171	177
Loans and Leases Receivable, Gross	12,738	14,610
Commercial and Multifamily Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	3,850,155	3,901,333
Loans Receivable, Gross, Commercial, Construction	385,950	372,538
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	3,776,709	3,825,739
Loans Receivable, Gross, Commercial, Construction	385,339	371,931
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	73,446	75,594
Loans Receivable, Gross, Commercial, Construction	611	607
Loans and Leases Receivable, Gross	77,400	79,211
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	3,415,698	3,389,952
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	3,402,162	3,377,324
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	13,536	12,628
Loans and Leases Receivable, Gross	14,201	13,753
Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	4,043,141	4,102,124
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	3,959,011	4,014,135
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	84,130	87,989
Loans and Leases Receivable, Gross	90,138	93,821
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	171	177
Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	594,562	573,233
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	593,780	572,449
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	782	784
Loans and Leases Receivable, Gross	760	772
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	334,482	345,459
Allowance for loan losses	(5,216)	(5,163)	$ (3,360)	$ (3,534)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	323,631	334,190
Loans and Leases Receivable, Gross	322,076	332,225
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	10,851	11,269
Loans and Leases Receivable, Gross	$ 11,989	$ 12,412

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Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 78,464	$ 66,189
Unpaid Principal Balance Nonaccrual Loans	91,271	79,886
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	57,504	45,410
Unpaid Principal Balance Nonaccrual Loans	69,056	56,865
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	115	50
Unpaid Principal Balance Nonaccrual Loans	115	49
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,054	785
Unpaid Principal Balance Nonaccrual Loans	1,426	1,182
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,192	2,628
Unpaid Principal Balance Nonaccrual Loans	3,201	2,623
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,980	4,284
Unpaid Principal Balance Nonaccrual Loans	4,264	5,410
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	7,367	7,029
Unpaid Principal Balance Nonaccrual Loans	7,621	7,270
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	25
Unpaid Principal Balance Nonaccrual Loans	0	26
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,210	1,829
Unpaid Principal Balance Nonaccrual Loans	1,210	1,828
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	4,042	4,149
Unpaid Principal Balance Nonaccrual Loans	$ 4,378	$ 4,633

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Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 78,464	$ 66,189
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	8,100,317	8,163,583
Past Due Loans	51,551	16,215
Nonaccrual Loans	78,464	66,189
Loans Receivable, Net	8,230,332	8,245,987
Secured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	57,504	45,410
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	3,189,473	3,185,321
Past Due Loans	19,282	4,930
Nonaccrual Loans	57,504	45,410
Loans Receivable, Net	3,266,259	3,235,661
Unsecured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	115	50
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	119,863	123,524
Past Due Loans	101	601
Nonaccrual Loans	115	50
Loans Receivable, Net	120,079	124,175
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,054	785
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	179,174	184,256
Past Due Loans	340	1,513
Nonaccrual Loans	1,054	785
Loans Receivable, Net	180,568	186,554
Commercial Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	3,192	2,628
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	283,973	292,680
Past Due Loans	2,299	673
Nonaccrual Loans	3,192	2,628
Loans Receivable, Net	289,464	295,981
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	3,980	4,284
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,867,450	1,898,655
Past Due Loans	2,744	3,397
Nonaccrual Loans	3,980	4,284
Loans Receivable, Net	1,874,174	1,906,336
Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	7,367	7,029
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,570,051	1,590,004
Past Due Loans	13,523	2,953
Nonaccrual Loans	7,367	7,029
Loans Receivable, Net	1,590,941	1,599,986
Land And Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	0	25
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	5,937	9,882
Past Due Loans	603	0
Nonaccrual Loans	0	25
Loans Receivable, Net	6,540	9,907
Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,210	1,829
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	199,756	187,862
Past Due Loans	112	0
Nonaccrual Loans	1,210	1,829
Loans Receivable, Net	201,078	189,691
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	295,067	293,028
Past Due Loans	11,070	0
Nonaccrual Loans	0	0
Loans Receivable, Net	306,137	293,028
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	73,016	72,443
Past Due Loans	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	73,016	72,443
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	4,042	4,149
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	316,557	325,928
Past Due Loans	1,477	2,148
Nonaccrual Loans	4,042	4,149
Loans Receivable, Net	322,076	332,225
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	7,043	5,444
Financing Receivables, 60 to 89 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	2,872	2,400
Financing Receivables, 60 to 89 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	51	501
Financing Receivables, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	402
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	815	971
Financing Receivables, 60 to 89 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	2,772	468
Financing Receivables, 60 to 89 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	285	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	248	702
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	44,508	10,190
Financing Receivables, 30 to 59 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	16,410	2,530
Financing Receivables, 30 to 59 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	50	100
Financing Receivables, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	340	1,111
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	2,299	92
Financing Receivables, 30 to 59 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	1,929	2,426
Financing Receivables, 30 to 59 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	10,751	2,485
Financing Receivables, 30 to 59 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	318	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	112	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	11,070	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	1,229	1,446
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	581
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	581
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	$ 0	$ 0

XML

Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 8,158,383		$ 8,176,782
Recorded Investment of Loans Individually Measured for Specific Impairment	71,949		69,205
Recorded Investment	48,824		56,357
Unpaid Principal Balance	52,674		64,735
Related Allowance	5,857		2,360
Average Recorded Investment Impaired Loans	70,577	$ 24,394
Interest Recognized on Impaired Loans	239	49
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	3,221,659		3,195,649
Recorded Investment of Loans Individually Measured for Specific Impairment	44,600		40,012
Recorded Investment	13,836		3,808
Unpaid Principal Balance	18,931		3,937
Related Allowance	5,657		1,867
Average Recorded Investment Impaired Loans	42,306	8,303
Interest Recognized on Impaired Loans	12	19
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	120,056		124,150
Recorded Investment of Loans Individually Measured for Specific Impairment	23		25
Recorded Investment	23		25
Unpaid Principal Balance	23		24
Related Allowance	2		3
Average Recorded Investment Impaired Loans	24	0
Interest Recognized on Impaired Loans	0	0
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	179,700		185,659
Recorded Investment of Loans Individually Measured for Specific Impairment	868		895
Recorded Investment	428		867
Unpaid Principal Balance	715		1,408
Related Allowance	22		103
Average Recorded Investment Impaired Loans	881	521
Interest Recognized on Impaired Loans	7	2
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	286,613		293,694
Recorded Investment of Loans Individually Measured for Specific Impairment	2,851		2,287
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	2,569	1,504
Interest Recognized on Impaired Loans	0	0
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,870,614		1,901,313
Recorded Investment of Loans Individually Measured for Specific Impairment	3,560		5,023
Recorded Investment	0		2,768
Unpaid Principal Balance	0		3,328
Related Allowance	0		185
Average Recorded Investment Impaired Loans	4,292	4,059
Interest Recognized on Impaired Loans	31	1
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,582,385		1,591,298
Recorded Investment of Loans Individually Measured for Specific Impairment	8,556		8,688
Recorded Investment	3,399		77
Unpaid Principal Balance	4,821		80
Related Allowance	5		3
Average Recorded Investment Impaired Loans	8,622	4,462
Interest Recognized on Impaired Loans	84	0
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	6,540		9,907
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	0	7
Interest Recognized on Impaired Loans	0	0
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	199,868		188,481
Recorded Investment of Loans Individually Measured for Specific Impairment	1,210		1,210
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	1,210	168
Interest Recognized on Impaired Loans	0	0
Income Property Multifamily Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	306,137		293,028
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Owner Occupied Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	68,966		68,393
Recorded Investment of Loans Individually Measured for Specific Impairment	4,050		4,050
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	4,050	0
Interest Recognized on Impaired Loans	51	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	315,845		325,210
Recorded Investment of Loans Individually Measured for Specific Impairment	6,231		7,015
Recorded Investment	5,439		5,303
Unpaid Principal Balance	5,707		5,568
Related Allowance	171		199
Average Recorded Investment Impaired Loans	6,623	5,370
Interest Recognized on Impaired Loans	54	$ 27
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	23,125		12,848
Unpaid Principal Balance	30,197		14,345
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	30,764		36,204
Unpaid Principal Balance	33,785		42,314
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	440		28
Unpaid Principal Balance	1,017		337
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,851		2,287
Unpaid Principal Balance	2,860		2,282
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	3,560		2,255
Unpaid Principal Balance	3,623		2,601
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	5,157		8,611
Unpaid Principal Balance	5,269		10,077
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,210		1,210
Unpaid Principal Balance	1,210		1,210
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,050		4,050
Unpaid Principal Balance	4,050		4,050
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	792		1,712
Unpaid Principal Balance	$ 860		$ 1,864

XML

Loans Loans (Analysis of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Modifications contract	Mar. 31, 2017 USD ($) Modifications contract	Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0
Loans and Leases Receivable, Related Parties	$ 9,900		$ 10,000
Financing Receivable Modifications Additional Commitment To Lend	$ 121		$ 506
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	9	13
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,484	$ 1,902
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,484	$ 1,902
Loans, Excluding Purchased Credit Impaired Loans [Member] | Secured Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	1	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 450	$ 356
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 450	$ 356
Loans, Excluding Purchased Credit Impaired Loans [Member] | Income Property Multifamily [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	1	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 891	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 891	$ 0
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	7	10
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,143	$ 1,546
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,143	$ 1,546

XML

Loans Loans (Analysis of Purchased Credit Impaired Loans - Accretable Yield Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Loans, Analysis of Purchased Credit Impaired Loans, Accretable Yield Rollforward [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 29,355	$ 38,444	$ 31,176	$ 45,191
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	2,265	4,182
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	159	158
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	$ 603	$ (2,407)

XML

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan and lease losses	$ 5,852	$ 2,775

XML

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 75,646	$ 70,043
Charged-offs	(4,307)	(3,815)
Recoveries	2,636	2,018
Provision for loan and lease losses	5,852	2,775
Ending balance	79,827	71,021
Specific Reserve	5,857	94
General Allocation	73,970	70,927
Secured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	29,341	36,050
Charged-offs	(2,414)	(1,109)
Recoveries	553	297
Provision for loan and lease losses	9,851	434
Ending balance	37,331	35,672
Specific Reserve	5,657	0
General Allocation	31,674	35,672
Unsecured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,000	960
Charged-offs	(63)	(18)
Recoveries	249	68
Provision for loan and lease losses	409	178
Ending balance	2,595	1,188
Specific Reserve	2	0
General Allocation	2,593	1,188
One-to-Four Family Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	701	599
Charged-offs	0	(307)
Recoveries	172	117
Provision for loan and lease losses	(315)	236
Ending balance	558	645
Specific Reserve	22	11
General Allocation	536	634
Commercial Land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,265	1,797
Charged-offs	0	0
Recoveries	6	0
Provision for loan and lease losses	(526)	491
Ending balance	3,745	2,288
Specific Reserve	0	0
General Allocation	3,745	2,288
Income Property Multifamily [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,672	7,342
Charged-offs	(223)	0
Recoveries	141	35
Provision for loan and lease losses	(888)	(574)
Ending balance	4,702	6,803
Specific Reserve	0	26
General Allocation	4,702	6,777
Owner Occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,459	6,439
Charged-offs	0	0
Recoveries	12	43
Provision for loan and lease losses	(722)	52
Ending balance	4,749	6,534
Specific Reserve	5	0
General Allocation	4,744	6,534
Land And Acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	963	316
Charged-offs	0	(14)
Recoveries	16	20
Provision for loan and lease losses	(67)	187
Ending balance	912	509
Specific Reserve	0	0
General Allocation	912	509
Residential Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,709	669
Charged-offs	0	0
Recoveries	3	9
Provision for loan and lease losses	924	431
Ending balance	4,636	1,109
Specific Reserve	0	0
General Allocation	4,636	1,109
Income Property Multifamily Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,053	404
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	421	378
Ending balance	7,474	782
Specific Reserve	0	0
General Allocation	7,474	782
Owner Occupied Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,413	1,192
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	(2,490)	576
Ending balance	1,923	1,768
Specific Reserve	0	0
General Allocation	1,923	1,768
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,163	3,534
Charged-offs	(264)	(428)
Recoveries	260	285
Provision for loan and lease losses	57	(31)
Ending balance	5,216	3,360
Specific Reserve	171	57
General Allocation	5,045	3,303
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,907	10,515
Charged-offs	(1,343)	(1,939)
Recoveries	1,224	1,144
Provision for loan and lease losses	(1,123)	(325)
Ending balance	5,665	9,395
Specific Reserve	0	0
General Allocation	5,665	9,395
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	226
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	321	742
Ending balance	321	968
Specific Reserve	0	0
General Allocation	$ 321	$ 968

XML

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit
Beginning balance	$ 3,130	$ 2,705
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	1,200	850
Ending balance	$ 4,330	$ 3,555

XML

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	$ 79,827	$ 75,646	$ 71,021	$ 70,043
Loans, net	8,259,804	8,283,011
Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,230,332	8,245,987
Less: allowance for loan and lease losses	74,162	68,739
Loans, net	8,156,170	8,177,248
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	117,088	120,758
Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans	7,789	8,088
Less: allowance for loan and lease losses	5,665	6,907
Loans, net	103,634	105,763
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	7,915,504	7,926,539
Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	114,188	117,307
Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	79,017	95,551
Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	349
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	235,811	223,897
Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,900	3,102
Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Secured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	37,331	29,341	35,672	36,050
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,266,259	3,235,661
Secured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	13,310	12,641
Secured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,067,417	3,049,031
Secured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	12,582	11,918
Secured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	47,672	64,600
Secured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Secured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	151,170	122,030
Secured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	728	723
Secured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Secured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	2,595	2,000	1,188	960
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	120,079	124,175
Unsecured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	891	1,112
Unsecured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	119,416	123,621
Unsecured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	891	1,045
Unsecured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	663	554
Unsecured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	67
Unsecured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
One-to-Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	558	701	645	599
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	180,568	186,554
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	12,738	14,610
One-to-Four Family Residential [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	177,122	183,312
One-to-Four Family Residential [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,967	13,817
One-to-Four Family Residential [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,208	1,186
One-to-Four Family Residential [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
One-to-Four Family Residential [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,238	2,056
One-to-Four Family Residential [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	771	793
One-to-Four Family Residential [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
One-to-Four Family Residential [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Commercial Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	3,745	4,265	2,288	1,797
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	289,464	295,981
Commercial Land [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	12,223	9,809
Commercial Land [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	279,949	283,673
Commercial Land [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	12,223	9,460
Commercial Land [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,288	5,204
Commercial Land [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	349
Commercial Land [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,227	7,104
Commercial Land [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Commercial Land [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Commercial Land [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	4,702	5,672	6,803	7,342
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,874,174	1,906,336
Income Property Multifamily [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	22,384	26,016
Income Property Multifamily [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,837,613	1,857,832
Income Property Multifamily [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	22,384	25,981
Income Property Multifamily [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	19,863	17,181
Income Property Multifamily [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	16,698	31,323
Income Property Multifamily [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	35
Income Property Multifamily [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	4,749	5,459	6,534	6,439
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,590,941	1,599,986
Owner Occupied [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	42,793	43,386
Owner Occupied [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,542,605	1,546,775
Owner Occupied [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	41,874	42,617
Owner Occupied [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,986	7,380
Owner Occupied [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	39,350	45,831
Owner Occupied [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	919	769
Owner Occupied [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	912	963	509	316
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,540	9,907
Land And Acquisition [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	171	177
Land And Acquisition [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,540	9,882
Land And Acquisition [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	164	169
Land And Acquisition [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	25
Land And Acquisition [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	7	8
Land And Acquisition [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	4,636	3,709	1,109	669
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	201,078	189,691
Residential Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	199,868	187,863
Residential Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Residential Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,210	1,828
Residential Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Residential Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	7,474	7,053	782	404
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	306,137	293,028
Income Property Multifamily Construction [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	589	595
Income Property Multifamily Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	303,079	293,028
Income Property Multifamily Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	589	595
Income Property Multifamily Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,058	0
Income Property Multifamily Construction [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Income Property Multifamily Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	1,923	4,413	1,768	1,192
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	73,016	72,443
Owner Occupied Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	67,672	68,393
Owner Occupied Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,344	4,050
Owner Occupied Construction [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Owner Occupied Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	5,216	5,163	$ 3,360	$ 3,534
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	322,076	332,225
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,989	12,412
Consumer Portfolio Segment [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	314,223	323,129
Consumer Portfolio Segment [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,514	11,705
Consumer Portfolio Segment [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	7,853	9,096
Consumer Portfolio Segment [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	475	707
Consumer Portfolio Segment [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 0	$ 0

XML

Other Real Estate Owned (Summary of Other Real Estate Owned) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 13,298	$ 5,998
Transfers in	406	0
Valuation adjustments	(92)	(193)
Proceeds from Sale of OREO Property	2,062	1,275
Loss on sale of OREO, net	(43)	(11)
Total OREO, end of period	11,507	$ 4,519
Mortgage Loans in Process of Foreclosure, Amount	638
One-to-Four Family Residential [Member]
Other Real Estate Owned [Line Items]
Total OREO, end of period	$ 433

XML

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, beginning of period	$ 765,842
Total goodwill, end of period	765,842	$ 382,762
CDI current period amortization	(3,188)	(1,349)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	919	919
Other intangible assets, net	54,985	16,282	$ 58,173
Total goodwill and intangible assets, end of period	$ 820,827	399,044
Core Deposits [Member]
Goodwill and Intangible Assets [Line Items]
Estimated life of CDI, in years	10 years
Goodwill and Intangible Assets [Roll Forward]
Gross core deposit intangible balance, beginning of period			105,473	$ 58,598
Accumulated amortization at beginning of period			$ (48,219)	$ (41,886)
Core deposit intangible, net, beginning of period	$ 57,254	16,712
CDI current period amortization	(3,188)	(1,349)
Total core deposit intangible, end of period	$ 54,066	$ 15,363

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Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Future Amortization Expense For Core Deposit Intangibles
2018	$ 9,048
2019	10,479
2020	8,724
2021	7,264
2022	$ 5,880

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Subordinated debentures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Nov. 01, 2017
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Interest Rate	5.875%
Debt Instrument, Interest Rate Terms	471.5
Pacific Continental [Member]
Subordinated Borrowing [Line Items]
Business Combination, Purchase Price Allocation, Subordinated Debt		$ 35.0

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Junior subordinated debt (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Nov. 01, 2017
junior subordinated debentures [Line Items]
Junior Subordinated Notes	$ 0		$ 8,248
Repayments of junior subordinated debt	$ 8,248	$ 0	$ 6,200
Pacific Continental [Member]
junior subordinated debentures [Line Items]
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures				$ 14,434

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Derivatives and Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 6	$ 4
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	24,247
Secured Borrowings, Gross, Difference, Amount	0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Derivative [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	24,247
Maturity Overnight [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Derivative [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	24,247
Maturity Less than 30 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Derivative [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	0
Maturity 30 to 90 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Derivative [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	0
Maturity Greater than 90 Days [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Derivative [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	393,800		$ 384,700
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of asset derivative instruments	7,406		6,707
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of liability derivative instruments	$ 7,409		$ 6,714

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Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 24,247
Repurchase agreements, amounts offset in balance sheet	0	$ 0
Repurchase agreements, net amount presented in statement of financial position	24,247	79,059
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(24,247)	(79,059)
Securities sold under agreements to repurchase, amount not offset	0	0
Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Assets, Gross Amounts Offset in the Balance Sheets	0	0
Derivative Asset	7,406	6,707
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	7,406	6,707
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	7,409	6,714
Derivative, Collateral, Right to Reclaim Securities	(1,190)	(6,714)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	6,219	0
Available-for-sale Securities [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	24,247	79,059
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Assets [Member]
Balance Sheet Offsetting [Line Items]
Fair value of asset derivative instruments	7,406	6,707
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Balance Sheet Offsetting [Line Items]
Fair value of liability derivative instruments	7,409	$ 6,714
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	24,247
Maturity Overnight [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 24,247

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Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 2,580,000	$ 2,620,000
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	41,900	51,300
Commercial Letter of Credit and other off-balance sheet liabilities [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 58	$ 159

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Shareholders' Equity (Details) - $ / shares	Apr. 25, 2018	Jan. 25, 2018
Class of Stock [Line items]
Declared quarterly cash dividend		$ 0.22
Subsequent Event [Member]
Class of Stock [Line items]
Declared quarterly cash dividend	$ 0.26

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Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (22,225)	$ (18,999)
Other comprehensive loss before reclassifications	[1]	(26,048)	6,306
Amounts reclassified from accumulated other comprehensive loss	[1]	(17)	87
Net current-period other comprehensive income (loss)	[1]	(26,065)	6,393
Ending balance		(48,133)	(12,606)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(19,779)	(12,704)
Other comprehensive loss before reclassifications	[1]	(26,048)	1,702
Amounts reclassified from accumulated other comprehensive loss	[1]	(78)	0
Net current-period other comprehensive income (loss)	[1]	(26,126)	1,702
Ending balance		(45,748)	(11,002)
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(2,446)	(6,295)
Other comprehensive loss before reclassifications	[1]	0	4,604
Amounts reclassified from accumulated other comprehensive loss	[1]	61	87
Net current-period other comprehensive income (loss)	[1]	61	4,691
Ending balance		$ (2,385)	$ (1,604)
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (46)
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				157
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				0
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 157

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.

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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net	$ 22	$ 0
Compensation and employee benefits	50,570	40,825
Total before tax	46,785	39,773
Income tax provision	(6,815)	(10,574)
Net income	39,970	29,199
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net	102	0
Total before tax	102	0
Income tax provision	(24)	0
Net income	78	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and employee benefits	(80)	(136)
Total before tax	(80)	(136)
Income tax provision	19	49
Net income	$ (61)	$ (87)

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Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	$ 5,000	$ 5,080
Fair Value, Level 2 to level 1 Transfers, Amount	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 2,624,045	2,737,751
Marketable Securities, Equity Securities	5,000	5,080
Other assets (Interest rate contracts)	7,406	6,707
Other liabilities (Interest rate contracts)	7,409	6,714
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
Marketable Securities, Equity Securities	5,000	5,080
Other assets (Interest rate contracts)	0	0
Other liabilities (Interest rate contracts)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,623,798	2,737,503
Marketable Securities, Equity Securities	0	0
Other assets (Interest rate contracts)	7,406	6,707
Other liabilities (Interest rate contracts)	7,409	6,714
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Marketable Securities, Equity Securities	0	0
Other assets (Interest rate contracts)	0	0
Other liabilities (Interest rate contracts)	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,645,218	1,726,725
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,645,218	1,726,725
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	582,748	596,004
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	582,748	596,004
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	395,832	414,774
U.S. Government Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	395,832	414,774
U.S. Government Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
US Government Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
US Government Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
US Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
US Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

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Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 7,820
Fair Value, Option, Changes in Fair Value, Gain (Loss)	5,109	$ 193
OREO	160	1,260
Assets, Fair Value Disclosure	7,980	1,260
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
OREO	0	0
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
OREO	0	0
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	7,820
OREO	160	1,260
Assets, Fair Value Disclosure	7,980	1,260
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	5,058
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 51	$ 193

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Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 7,820
OREO	160	$ 1,260
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	7,820
OREO	160	$ 1,260
Collateral Pledged [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 7,512
Collateral Pledged [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%
Collateral Pledged [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	100.00%
Collateral Pledged [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	41.33%
Uncollateralized [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 308
Uncollateralized [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	6.00%
Uncollateralized [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	6.00%
Uncollateralized [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	6.00%

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Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Interest-earning deposits with banks	$ 87,124	$ 97,918
Available-for-sale Securities, Debt Securities	2,624,045	2,737,751
Marketable Securities, Equity Securities	5,000	5,080
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	206,532	244,615
Interest-earning deposits with banks	87,124	97,918
Available-for-sale Securities, Debt Securities	2,624,045	2,737,751
Marketable Securities, Equity Securities	5,000	5,080
FHLB stock	11,640	10,440
Loans held for sale	4,312	5,766
Loans	8,281,010	8,055,817
Interest rate contracts	7,406	6,707
Liabilities
Deposits	465,896	10,524,135
FHLB Advances	42,090	12,281
Repurchase agreements	24,247	79,070
Interest rate contracts	7,409	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,486	35,895
Junior subordinated debentures, fair value disclosure		8,248
Reported Value Measurement [Member]
Assets
Cash and due from banks	206,532	244,615
Interest-earning deposits with banks	87,124	97,918
Available-for-sale Securities, Debt Securities	2,624,045	2,737,751
Marketable Securities, Equity Securities	5,000	5,080
FHLB stock	11,640	10,440
Loans held for sale	4,312	5,766
Loans	8,259,804	8,283,011
Interest rate contracts	7,406	6,707
Liabilities
Deposits	474,000	10,532,085
FHLB Advances	41,564	11,579
Repurchase agreements	24,247	79,059
Interest rate contracts	7,409	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,601	35,647
Junior subordinated debentures, fair value disclosure		8,248
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	206,532	244,615
Interest-earning deposits with banks	87,124	97,918
Available-for-sale Securities, Debt Securities	247	248
Marketable Securities, Equity Securities	5,000	5,080
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
Interest rate contracts	0	0
Liabilities
Deposits	0	10,041,040
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Subordinated Debt Obligations, Fair Value Disclosure	0	0
Junior subordinated debentures, fair value disclosure		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Available-for-sale Securities, Debt Securities	2,623,798	2,737,503
Marketable Securities, Equity Securities	0	0
FHLB stock	11,640	10,440
Loans held for sale	4,312	5,766
Loans	0	0
Interest rate contracts	7,406	6,707
Liabilities
Deposits	465,896	483,095
FHLB Advances	42,090	12,281
Repurchase agreements	24,247	79,070
Interest rate contracts	7,409	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,486	35,895
Junior subordinated debentures, fair value disclosure		8,248
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Available-for-sale Securities, Debt Securities	0	0
Marketable Securities, Equity Securities	0	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	8,281,010	8,055,817
Interest rate contracts	0	0
Liabilities
Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Subordinated Debt Obligations, Fair Value Disclosure	$ 0	0
Junior subordinated debentures, fair value disclosure		$ 0

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Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 39,970	$ 29,199
Earnings allocated to participating securities - preferred shares	0	3
Earnings allocated to participating securities - nonvested restricted shares	437	397
Earnings allocated to common shareholders, Basic	$ 39,533	$ 28,799
Weighted average common shares outstanding	72,300	57,388
Basic earnings per common share	$ 0.55	$ 0.50
Earnings allocated to common shareholders, Diluted	$ 39,533	$ 28,799
Dilutive effect of equity awards and warrants	5	6
Weighted average diluted common shares outstanding	72,305	57,394
Diluted earnings per common share	$ 0.55	$ 0.50
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	12	14

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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from Contract with Customer [Abstract]
Deposit account and treasury management fees	$ 8,740	$ 7,287
Card revenue	5,813	5,723
Financial services and trust revenue	2,730	2,839
Loan revenue	3,186	3,593
Revenue from contracts with customers	17,283
Noninterest income, excluding revenue from contracts with customers	5,860
Noninterest Income	$ 23,143	$ 24,859