Columbia Banking System (COLB) 10-Q 8 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Entity Registrant Name	COLUMBIA BANKING SYSTEM INC
Entity Central Index Key	887,343
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		58,373,165

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 186,116	$ 193,038
Interest-earning deposits with banks	136,578	31,200
Total cash and cash equivalents	322,694	224,238
Securities available for sale at fair value (amortized cost of $2,215,335 and $2,299,037, respectively)	2,207,873	2,278,577
Federal Home Loan Bank stock at cost	10,240	10,240
Loans held for sale	7,802	5,846
Loans, net of unearned income of ($29,229) and ($33,718), respectively	6,512,006	6,213,423
Less: allowance for loan and lease losses	71,616	70,043
Loans, net	6,440,390	6,143,380
FDIC loss-sharing asset	0	3,535
Interest receivable	36,163	30,074
Premises and equipment, net	143,351	150,342
Other real estate owned	3,682	5,998
Goodwill	382,762	382,762
Other intangible assets, net	13,845	17,631
Other assets	245,776	256,984
Total assets	9,814,578	9,509,607
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	4,119,950	3,944,495
Interest-bearing	4,221,767	4,114,920
Total deposits	8,341,717	8,059,415
Federal Home Loan Bank advances	6,465	6,493
Securities sold under agreements to repurchase	40,933	80,822
Other liabilities	97,035	111,865
Total liabilities	8,486,150	8,258,595
Commitments and contingent liabilities (Note 10)
Shareholders' equity:
Preferred Stock, Shares Authorized	2,000	2,000
Preferred Stock, Shares Issued	0	9
Preferred Stock, Value, Issued	$ 0	$ 2,217
Authorized shares	115,000	115,000
Common Stock Shares Issued And Outstanding	58,376	58,042
Common Stock (no par value)	$ 1,003,887	$ 995,837
Retained earnings	330,474	271,957
Accumulated other comprehensive loss	(5,933)	(18,999)
Total shareholders’ equity	1,328,428	1,251,012
Total liabilities and shareholders’ equity	$ 9,814,578	$ 9,509,607

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities available-for-sale, amortized cost	$ 2,215,335	$ 2,299,037
Less: unearned income on loans	$ (29,229)	$ (33,718)
Common stock, par value	$ 0	$ 0
Authorized shares	115,000	115,000
Common stock, shares outstanding	58,376	58,042

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Income
Loans	$ 78,641	$ 74,956	$ 228,340	$ 216,923
Taxable securities	8,718	8,988	29,172	25,834
Tax-exempt securities	2,718	2,799	8,125	8,397
Deposits in banks	226	15	268	81
Total interest income	90,303	86,758	265,905	251,235
Interest Expense
Deposits	1,083	823	2,778	2,352
Federal Home Loan Bank advances	163	229	979	594
Other borrowings	128	134	383	407
Total interest expense	1,374	1,186	4,140	3,353
Net Interest Income	88,929	85,572	261,765	247,882
Provision (recapture) for loan and lease losses	(648)	1,866	5,304	10,760
Net interest income after provision (recapture) for loan and lease losses	89,577	83,706	256,461	237,122
Noninterest Income
Deposit account and treasury management fees	7,685	7,222	22,368	21,304
Card revenue	6,735	6,114	18,660	17,817
Financial services and trust revenue	2,645	2,746	8,520	8,347
Loan revenue	3,154	2,949	9,736	8,013
Merchant Discount Fees	0	2,352	4,283	6,726
Bank owned life insurance	1,290	1,073	4,003	3,459
Investment securities gains	0	572	0	1,174
Change in FDIC loss-sharing asset	0	(104)	(447)	(2,197)
Gain on sale of merchant card services portfolio	14,000	0	14,000	0
Other	1,558	242	4,938	1,109
Total noninterest income	37,067	23,166	86,061	65,752
Noninterest Expense
Compensation and employee benefits	39,983	38,476	119,201	112,086
Occupancy	8,085	8,219	22,853	26,044
Merchant processing expense	0	1,161	2,196	3,312
Advertising and promotion	969	1,993	2,923	3,878
Data processing	4,122	4,275	13,071	12,350
Legal and professional fees	2,880	2,264	9,196	5,366
Taxes, licenses and fees	1,505	1,491	3,494	4,079
Regulatory premiums	782	776	2,299	2,985
Net cost (benefit) of operation of other real estate owned	271	(249)	422	(61)
Amortization of intangibles	1,188	1,460	3,786	4,526
Other	7,752	7,398	25,949	21,563
Total noninterest expense	67,537	67,264	205,390	196,128
Income before income taxes	59,107	39,608	137,132	106,746
Income tax provision	18,338	12,124	40,032	32,598
Net Income	$ 40,769	$ 27,484	$ 97,100	$ 74,148
Earnings per common share
Basic ($ per share)	$ 0.70	$ 0.47	$ 1.67	$ 1.28
Diluted ($ per share)	0.70	0.47	1.67	1.28
Dividends paid per common share	$ 0.22	$ 0.39	$ 0.66	$ 1.14
Weighted average number of common shares outstanding	57,566	57,215	57,459	57,173
Weighted average number of diluted common shares outstanding	57,571	57,225	57,465	57,183

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income		$ 40,769	$ 27,484	$ 97,100	$ 74,148
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		549	(4,049)	8,284	23,229
Reclassification adjustment of net gain from sale of available for sale securities included in income		0	(364)	0	(748)
Net unrealized gain from securities, net of reclassification adjustment		549	(4,413)	8,284	22,481
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				4,604	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		46	107	178	319
Pension plan liability adjustment, net		46	107	4,782	319
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	595	(4,306)	13,066	22,800
Total comprehensive income		$ 41,364	$ 23,178	$ 110,166	$ 96,948
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$ (312)	$ 2,305	$ (4,716)	$ (13,225)
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	0	208	0	426
Net unrealized loss from unfunded defined benefit plan liability arising during the period, tax	0	0	(2,622)	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	$ (26)	$ (60)	$ (101)	$ (182)

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Preferred Stock [Member]
Balance, value at Dec. 31, 2015	$ 1,242,128	$ 990,281	$ 255,925	$ (6,295)	$ 2,217
Balance, shares at Dec. 31, 2015		57,724,000			9,000
Net income	74,148		74,148
Other comprehensive income	22,800			22,800
Issuance of common stock - stock option and other plans, value	1,304	$ 1,304
Issuance of common stock - stock option and other plans, shares		47,000
Issuance of common stock - restricted stock awards, net of cancelled awards, value	3,626	$ 3,626
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		310,000
Stock Repurchased and Retired During Period, Value	(1,113)	$ (1,113)
Stock Repurchased During Period, Shares		(38,000)
Dividends, Preferred Stock, Cash	(117)		(117)
Cash dividends paid on common stock	(66,041)		(66,041)
Balance, value at Sep. 30, 2016	1,276,735	$ 994,098	263,915	16,505	$ 2,217
Balance, shares at Sep. 30, 2016		58,043,000			9,000
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		58,042,000			8,782
Net income	97,100		97,100
Other comprehensive income	13,066			13,066
Issuance of common stock - stock option and other plans, value	1,980	$ 1,980
Issuance of common stock - stock option and other plans, shares		49,000
Issuance of common stock - restricted stock awards, net of cancelled awards, value	5,915	$ 5,915
Conversion of Stock, Shares Converted					(9,000)
Conversion of Stock, Amount Converted					$ (2,217)
Conversion of Stock, New Issuance		102,000
Conversion of Stock, Amount Issued	0	$ 2,217
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		238,000
Stock Repurchased and Retired During Period, Value	(2,246)	$ (2,246)
Stock Repurchased During Period, Shares		(55,000)
Cash dividends paid on common stock	(38,466)		(38,466)
Balance, value at Sep. 30, 2017	$ 1,328,428	$ 1,003,887	$ 330,474	$ (5,933)	$ 0
Balance, shares at Sep. 30, 2017		58,376,000			0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
FDIC loss-sharing agreement early termination, pretax loss	$ 2,409	$ 0
Cash Flows From Operating Activities
Net income	97,100	74,148
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses	5,304	10,760
Stock-based compensation expense	5,915	3,626
Depreciation, amortization and accretion	21,483	27,796
Investment securities gains	0	1,174
Net realized (gain) loss on sale of premises and equipment, loans held for investment and other assets	(189)	186
Net realized loss on sale and valuation adjustments of other real estate owned	489	101
Originations of loans held for sale	99,130	76,645
Proceeds from sales of loans held for sale	97,174	77,793
Net change in:
Interest receivable	(6,089)	(3,729)
Interest payable	(21)	(84)
Other assets	3,359	(7,714)
Other liabilities	(2,624)	13,416
Net cash provided by operating activities	111,180	118,480
Gain on sale of merchant card services portfolio	(14,000)	0
Cash Flows From Investing Activities
Loans originated and acquired, net of principal collected	(304,831)	(450,914)
Purchases of securities available for sale	(130,906)	(502,602)
Purchases of premises and equipment	(4,380)	(2,705)
Payments to Acquire Federal Home Loan Bank Stock	(92,040)	(57,799)
Proceeds from FDIC for reimbursement on loss-sharing asset	26	878
Proceeds from sales of securities available for sale	0	120,800
Proceeds from principal repayments and maturities of securities available for sale	200,470	199,677
Proceeds from Sales of Assets, Investing Activities	12,157	7,391
Proceeds from sale of merchant card services portfolio	14,000	0
Proceeds from Sale of Federal Home Loan Bank Stock	92,040	57,881
Proceeds from sales of other real estate and other personal property owned	1,901	5,845
Payment to FDIC to terminate loss-sharing agreements	4,666	0
Payments to FDIC related to loss-sharing asset	(210)	(855)
Net cash used in investing activities	(216,439)	(622,403)
Cash Flows From Financing Activities
Net increase in deposits	282,336	619,162
Net decrease in sweep repurchase agreements	(39,889)	(30,510)
Proceeds from Federal Home Loan Bank advances	2,301,000	1,347,000
Federal Reserve Bank borrowings	10	10
Proceeds from exercise of stock options	1,980	1,304
Repayment of Federal Home Loan Bank advances	(2,301,000)	(1,349,000)
Repayment of Federal Reserve Bank borrowings	10	10
Payment of common stock dividends	(38,466)	(66,041)
Preferred stock dividends	0	(117)
Purchase and retirement of common stock	2,246	1,113
Net cash provided by financing activities	203,715	520,685
Increase in cash and cash equivalents	98,456	16,762
Cash and cash equivalents at beginning of period	224,238	175,302
Cash and cash equivalents at end of period	322,694	192,064
Supplemental Information:
Cash paid for interest	4,161	3,437
Cash paid for income tax	37,701	20,825
Non-cash investing and financing activities
Loans transferred to other real estate owned	$ 74	$ 1,202

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2017 are not necessarily indicative of results to be anticipated for the year ending December 31, 2017 . The accompanying interim unaudited Consolidated Financial Statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2016 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 2016 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2016 Form 10-K disclosure for the year ended December 31, 2016 . Recent Developments In July 2017, we entered into an asset purchase agreement (the “Agreement”) with a third-party by which we sold our merchant card services portfolio. In addition, we transitioned our delivery of those services from in-house to an outsourced model to better serve our business clients via a broad selection of competitive, best-in-class payment processing solutions. The carrying amount of both assets and liabilities subject to the Agreement was zero . In the current quarter, we recorded a $14.0 million gain on sale of the merchant card services portfolio. Under the new business model, we share with the buyer in net merchant services revenue and no longer directly incur merchant processing expenses. Our net revenue share from merchant services is presented in “Card Revenue” in the Consolidated Statements of Income. For the third quarter of 2017, that net revenue share was $438 thousand .

Accounting Pronouncements Recen

Accounting Pronouncements Recently Issued	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Pronouncements Recently Issued	Accounting Pronouncements Recently Issued In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-09, Scope of Modification Accounting . The amendments in this ASU provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments in ASU 2017-09 are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted. The adoption of ASU 2017-09 is not expected to have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities . The amendments included in this ASU change guidance on the amortization period of premiums on certain purchased callable debt securities. Specifically, the amendments shorten the premium amortization period to the earliest call date. The amendments in ASU 2017-08 are effective for fiscal years and interim periods within those years, beginning after December 15, 2018. Early adoption is permitted. The Company early adopted the amendments of ASU 2017-08 during the first quarter of 2017. The impact of the adoption of ASU 2017-08 to net income and opening retained earnings was not material. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment . The amendments in this are intended to reduce the cost and complexity of the goodwill impairment test by eliminating the second step of the goodwill impairment test. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. The amendments in ASU 2017-04 are effective for annual or interim periods beginning after December 15, 2019. Early adoption is permitted. The adoption of ASU 2017-04 is not expected to have a material impact on the Company’s consolidated financial statements. 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 March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting . The amendments included in this ASU simplify several aspects of the accounting for employee share-based payment transactions including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted the amendments of ASU 2016-09 during the first quarter of 2017. Adoption of amended forfeiture guidance resulted in an opening period adjustment decreasing retained earnings $117 thousand and increasing common stock $184 thousand . Adoption of the amended excess tax benefit guidance resulted in an income tax benefit of $22 thousand for the three months ended September 30, 2017 and an income tax benefit of $1.3 million or $0.02 per diluted common share for the nine months ended September 30, 2017 . 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. Significant implementation matters to be addressed by the Company include selecting a third-party lease accounting application, assessing the impact to its Consolidated Financial Statements and internal controls over financial reporting and documenting the new lease accounting process. See Note 17, “Commitments and Contingent Liabilities” to our 2016 Form 10-K, for more information regarding the minimum future payments related to our operating leases. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . The guidance in this update will replace most existing revenue recognition guidance in GAAP when it becomes effective. For public companies, this update was to be effective for interim and annual periods beginning after December 15, 2016. However, in August 2015, the FASB issued ASU 2015-14, which delayed the effective date of ASU 2014-09 by one year and permits companies to voluntarily adopt the new standard as of the original effective date. The FASB subsequently issued ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2017-13 to provide implementation guidance and practical expedients related to ASU 2014-09. The Company’s revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. The adoption of ASU 2017-04 is not expected to have a material impact on the Company’s consolidated financial statements.

Securities

Securities	9 Months Ended
	Sep. 30, 2017
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 securities available for sale: Amortized Gross Gross Fair Value (in thousands) September 30, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,391,636 $ 3,143 $ (17,362 ) $ 1,377,417 State and municipal securities 476,702 9,047 (2,261 ) 483,488 U.S. government agency and government-sponsored enterprise securities 341,462 1,372 (1,230 ) 341,604 U.S. government securities 251 — (1 ) 250 Other securities 5,284 82 (252 ) 5,114 Total $ 2,215,335 $ 13,644 $ (21,106 ) $ 2,207,873 December 31, 2016 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,486,690 $ 2,760 $ (23,718 ) $ 1,465,732 State and municipal securities 473,914 6,343 (5,197 ) 475,060 U.S. government agency and government-sponsored enterprise securities 332,348 1,065 (1,511 ) 331,902 U.S. government securities 801 — (1 ) 800 Other securities 5,284 63 (264 ) 5,083 Total $ 2,299,037 $ 10,231 $ (30,691 ) $ 2,278,577 The following table provides the proceeds and gross realized gains and losses on the sales of securities for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands) Proceeds from sales of available for sale securities $ — $ 37,390 $ — $ 120,800 Gross realized gains $ — $ 572 $ — $ 1,174 Gross realized losses — — — — Net realized gains $ — $ 572 $ — $ 1,174 The scheduled contractual maturities of investment securities available for sale at September 30, 2017 are presented as follows: September 30, 2017 Amortized Cost Fair Value (in thousands) Due within one year $ 108,477 $ 108,462 Due after one year through five years 506,439 509,784 Due after five years through ten years 672,288 671,188 Due after ten years 922,847 913,325 Other securities with no stated maturity 5,284 5,114 Total investment securities available-for-sale $ 2,215,335 $ 2,207,873 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: September 30, 2017 (in thousands) Washington and Oregon State to secure public deposits $ 242,188 Federal Reserve Bank to secure borrowings 54,723 Other securities pledged 122,392 Total securities pledged as collateral $ 419,303 The following table shows the gross unrealized losses and fair value of the Company’s investments 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 September 30, 2017 and December 31, 2016 : Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) September 30, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 537,162 $ (4,765 ) $ 456,330 $ (12,597 ) $ 993,492 $ (17,362 ) State and municipal securities 75,499 (700 ) 45,328 (1,561 ) 120,827 (2,261 ) U.S. government agency and government-sponsored enterprise securities 173,027 (665 ) 21,517 (565 ) 194,544 (1,230 ) U.S. government securities 250 (1 ) — — 250 (1 ) Other securities 2,278 (36 ) 2,740 (216 ) 5,018 (252 ) Total $ 788,216 $ (6,167 ) $ 525,915 $ (14,939 ) $ 1,314,131 $ (21,106 ) December 31, 2016 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,029,116 $ (18,788 ) $ 159,046 $ (4,930 ) $ 1,188,162 $ (23,718 ) State and municipal securities 211,342 (5,064 ) 3,384 (133 ) 214,726 (5,197 ) U.S. government agency and government-sponsored enterprise securities 218,811 (1,511 ) — — 218,811 (1,511 ) U.S. government securities 251 (1 ) — — 251 (1 ) Other securities 2,263 (51 ) 2,743 (213 ) 5,006 (264 ) Total $ 1,461,783 $ (25,415 ) $ 165,173 $ (5,276 ) $ 1,626,956 $ (30,691 ) At September 30, 2017 , there were 168 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 84 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 September 30, 2017 . At September 30, 2017 , there were 107 state and municipal government securities in an unrealized loss position, of which 40 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 September 30, 2017 , 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 September 30, 2017 . At September 30, 2017 , there were 22 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, of which five 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 September 30, 2017 . At September 30, 2017 , 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 September 30, 2017 . At September 30, 2017 , there were two other securities in an unrealized loss position, of which one was in a continuous unrealized loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates and the additional risk premium investors are demanding for investment securities with these characteristics. The Company does not consider these investments to be other-than-temporarily impaired at September 30, 2017 as it has the intent and ability to hold these investments for sufficient time to allow for recovery in the market value.

Loans

Loans	9 Months Ended
	Sep. 30, 2017
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): September 30, 2017 December 31, 2016 Loans, excluding PCI loans PCI Loans Total Loans, excluding PCI loans PCI Loans Total (in thousands) Commercial business $ 2,735,206 $ 13,662 $ 2,748,868 $ 2,551,054 $ 20,185 $ 2,571,239 Real estate: One-to-four family residential 176,487 14,325 190,812 170,331 17,862 188,193 Commercial and multifamily residential 2,825,794 79,336 2,905,130 2,719,830 89,231 2,809,061 Total real estate 3,002,281 93,661 3,095,942 2,890,161 107,093 2,997,254 Real estate construction: One-to-four family residential 145,419 377 145,796 121,887 832 122,719 Commercial and multifamily residential 213,939 958 214,897 209,118 1,565 210,683 Total real estate construction 359,358 1,335 360,693 331,005 2,397 333,402 Consumer 323,913 11,819 335,732 329,261 15,985 345,246 Less: Net unearned income (29,229 ) — (29,229 ) (33,718 ) — (33,718 ) Total loans, net of unearned income 6,391,529 120,477 6,512,006 6,067,763 145,660 6,213,423 Less: Allowance for loan and lease losses (64,272 ) (7,344 ) (71,616 ) (59,528 ) (10,515 ) (70,043 ) Total loans, net $ 6,327,257 $ 113,133 $ 6,440,390 $ 6,008,235 $ 135,145 $ 6,143,380 Loans held for sale $ 7,802 $ — $ 7,802 $ 5,846 $ — $ 5,846 At September 30, 2017 and December 31, 2016 , 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 $10.1 million at both September 30, 2017 and December 31, 2016 . During the first nine months of 2017 , there were $203 thousand in advances and $253 thousand in repayments. At September 30, 2017 and December 31, 2016 , $2.26 billion and $2.29 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 $69.8 million and $54.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at September 30, 2017 and December 31, 2016 , respectively. The following is an analysis of nonaccrual loans as of September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Recorded Unpaid Principal Recorded Unpaid Principal (in thousands) Commercial business: Secured $ 25,187 $ 35,843 $ 11,524 $ 21,503 Unsecured 26 1,342 31 303 Real estate: One-to-four family residential 816 2,904 568 1,302 Commercial & multifamily residential: Commercial land 2,333 2,629 934 922 Income property 3,586 4,702 4,005 4,247 Owner occupied 3,224 4,712 6,248 9,030 Real estate construction: One-to-four family residential: Land and acquisition 26 803 14 102 Residential construction 213 2,568 549 549 Consumer 4,906 5,418 3,883 4,331 Total $ 40,317 $ 60,921 $ 27,756 $ 42,289 Loans, excluding purchased credit impaired loans The following is an aging of the recorded investment of the loan portfolio as of September 30, 2017 and December 31, 2016 : Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans September 30, 2017 (in thousands) Commercial business: Secured $ 2,607,265 $ 2,292 $ 1,302 $ — $ 3,594 $ 25,187 $ 2,636,046 Unsecured 93,879 1 18 — 19 26 93,924 Real estate: One-to-four family residential 171,936 330 1,408 — 1,738 816 174,490 Commercial & multifamily residential: Commercial land 283,321 — — — — 2,333 285,654 Income property 1,375,163 1,493 2,656 — 4,149 3,586 1,382,898 Owner occupied 1,135,584 1,410 390 — 1,800 3,224 1,140,608 Real estate construction: One-to-four family residential: Land and acquisition 6,787 — — — — 26 6,813 Residential construction 137,707 — — — — 213 137,920 Commercial & multifamily residential: Income property 172,112 — — — — — 172,112 Owner occupied 39,561 — — — — — 39,561 Consumer 315,688 552 357 — 909 4,906 321,503 Total $ 6,339,003 $ 6,078 $ 6,131 $ — $ 12,209 $ 40,317 $ 6,391,529 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2016 (in thousands) Commercial business: Secured $ 2,439,250 $ 806 $ 10 $ — $ 816 $ 11,524 $ 2,451,590 Unsecured 94,118 287 301 — 588 31 94,737 Real estate: One-to-four family residential 164,416 2,448 500 — 2,948 568 167,932 Commercial & multifamily residential: Commercial land 269,816 64 — — 64 934 270,814 Income property 1,365,150 480 111 — 591 4,005 1,369,746 Owner occupied 1,052,078 1,652 — — 1,652 6,248 1,059,978 Real estate construction: One-to-four family residential: Land and acquisition 11,542 — — — — 14 11,556 Residential construction 109,080 — — — — 549 109,629 Commercial & multifamily residential: Income property 103,779 — — — — — 103,779 Owner occupied 103,480 — — — — — 103,480 Consumer 318,369 2,035 235 — 2,270 3,883 324,522 Total $ 6,031,078 $ 7,772 $ 1,157 $ — $ 8,929 $ 27,756 $ 6,067,763 The following is an analysis of impaired loans as of September 30, 2017 and December 31, 2016 : Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid September 30, 2017 (in thousands) Commercial business: Secured $ 2,614,647 $ 21,399 $ — $ — $ — $ 21,399 $ 26,655 Unsecured 93,924 — — — — — — Real estate: One-to-four family residential 173,562 928 459 736 26 469 1,030 Commercial & multifamily residential: Commercial land 283,355 2,299 — — — 2,299 2,287 Income property 1,378,127 4,771 519 523 25 4,252 4,570 Owner occupied 1,134,945 5,663 — — — 5,663 8,573 Real estate construction: One-to-four family residential: Land and acquisition 6,813 — — — — — — Residential construction 137,920 — — — — — — Commercial & multifamily residential: Income property 172,112 — — — — — — Owner occupied 35,511 4,050 — — — 4,050 4,050 Consumer 315,038 6,465 5,692 5,982 51 773 914 Total $ 6,345,954 $ 45,575 $ 6,670 $ 7,241 $ 102 $ 38,905 $ 48,079 Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid December 31, 2016 (in thousands) Commercial business: Secured $ 2,442,772 $ 8,818 $ 2,414 $ 2,484 $ 664 $ 6,404 $ 12,831 Unsecured 94,737 — — — — — — Real estate: One-to-four family residential 167,403 529 435 693 12 94 291 Commercial & multifamily residential: Commercial land 270,106 708 — — — 708 687 Income property 1,365,321 4,425 540 544 27 3,885 4,148 Owner occupied 1,054,564 5,414 — — — 5,414 8,102 Real estate construction: One-to-four family residential: Land and acquisition 11,542 14 14 102 1 — — Residential construction 109,293 336 — — — 336 336 Commercial & multifamily residential: Income property 103,779 — — — — — — Owner occupied 103,480 — — — — — — Consumer 319,307 5,215 4,464 4,558 57 751 833 Total $ 6,042,304 $ 25,459 $ 7,867 $ 8,381 $ 761 $ 17,592 $ 27,228 The following table provides additional information on impaired loans for the three and nine month periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized (in thousands) Commercial business: Secured $ 22,395 $ 2 $ 6,909 $ 15 $ 15,349 $ 25 $ 9,506 $ 48 Unsecured — — — — — — — — Real estate: One-to-four family residential 856 15 617 5 688 37 796 8 Commercial & multifamily residential: Commercial land 2,549 — 708 — 2,026 — 354 — Income property 4,214 21 1,939 8 4,137 27 2,010 19 Owner occupied 4,530 127 4,486 — 4,496 319 5,001 — Real estate construction: One-to-four family residential: Land and acquisition — — 103 1 4 — 245 4 Residential construction — — 449 — 84 — 506 — Commercial & multifamily residential: Owner occupied 2,025 151 — — 1,012 151 — — Consumer 6,054 58 3,345 25 5,712 105 2,084 46 Total $ 42,623 $ 374 $ 18,556 $ 54 $ 33,508 $ 664 $ 20,502 $ 125 The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and nine months ended September 30, 2017 and 2016 : Three months ended September 30, 2017 Three months ended September 30, 2016 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 2 $ 808 $ 808 2 $ 90 $ 90 Real estate: One-to-four family residential 2 201 201 1 85 85 Commercial and multifamily residential: Income property 1 1,152 1,152 — — — Owner occupied 1 78 78 — — — Real estate construction: Commercial and multifamily residential: Owner occupied 1 4,050 4,050 — — — Consumer 17 1,672 1,672 10 731 731 Total 24 $ 7,961 $ 7,961 13 $ 906 $ 906 Nine months ended September 30, 2017 Nine months ended September 30, 2016 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 7 $ 2,586 $ 2,586 7 $ 1,753 $ 1,753 Real estate: One-to-four family residential 3 583 583 2 115 115 Commercial and multifamily residential: Income property 1 1,152 1,152 — — — Owner occupied 1 78 78 1 250 250 Real estate construction: Commercial and multifamily residential: Owner occupied 1 4,050 4,050 — — — Consumer 35 4,033 4,033 28 3,442 3,442 Total 48 $ 12,482 $ 12,482 38 $ 5,560 $ 5,560 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 $529 thousand of additional funds on loans classified as TDR as of September 30, 2017 . The Company had $508 thousand of such commitments at December 31, 2016 . The Company did not have any loans modified as TDR that defaulted within twelve months of being modified as TDR during the three or nine months ended September 30, 2017 and 2016 . 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 September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (in thousands) Commercial business $ 14,895 $ 21,606 Real estate: One-to-four family residential 16,698 20,643 Commercial and multifamily residential 83,082 94,795 Total real estate 99,780 115,438 Real estate construction: One-to-four family residential 377 832 Commercial and multifamily residential 1,059 1,726 Total real estate construction 1,436 2,558 Consumer 13,039 17,649 Subtotal of PCI loans 129,150 157,251 Less: Valuation discount resulting from acquisition accounting 8,673 11,591 Allowance for loan losses 7,344 10,515 PCI loans, net of allowance for loan losses $ 113,133 $ 135,145 The following table shows the changes in accretable yield for PCI loans for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ 35,706 $ 52,909 $ 45,191 $ 58,981 Accretion (2,766 ) (4,902 ) (9,830 ) (12,905 ) Disposals — (178 ) (158 ) (157 ) Reclassifications from (to) nonaccretable difference (892 ) 1,034 (3,155 ) 2,944 Balance at end of period $ 32,048 $ 48,863 $ 32,048 $ 48,863

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2017 and 2016 . The following tables show a detailed analysis of the allowance for the three and nine months ended September 30, 2017 and 2016 : Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Three months ended September 30, 2017 (in thousands) Commercial business: Secured $ 39,539 $ (1,362 ) $ 550 $ (969 ) $ 37,758 $ — $ 37,758 Unsecured 1,147 — 138 (298 ) 987 — 987 Real estate: One-to-four family residential 628 — 40 3 671 26 645 Commercial & multifamily residential: Commercial land 2,356 — 45 (97 ) 2,304 — 2,304 Income property 6,854 — 9 241 7,104 25 7,079 Owner occupied 6,512 — 4 306 6,822 — 6,822 Real estate construction: One-to-four family residential: Land and acquisition 361 — 14 (83 ) 292 — 292 Residential construction 1,377 — 6 (272 ) 1,111 — 1,111 Commercial & multifamily residential: Income property 985 — — 279 1,264 — 1,264 Owner occupied 1,382 — — (87 ) 1,295 — 1,295 Consumer 3,551 (263 ) 343 42 3,673 51 3,622 Purchased credit impaired 8,061 (1,633 ) 1,389 (473 ) 7,344 — 7,344 Unallocated 231 — — 760 991 — 991 Total $ 72,984 $ (3,258 ) $ 2,538 $ (648 ) $ 71,616 $ 102 $ 71,514 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Nine months ended September 30, 2017 (in thousands) Commercial business: Secured $ 36,050 $ (6,071 ) $ 3,750 $ 4,029 $ 37,758 $ — $ 37,758 Unsecured 960 (18 ) 247 (202 ) 987 — 987 Real estate: One-to-four family residential 599 (460 ) 380 152 671 26 645 Commercial & multifamily residential: Commercial land 1,797 — 45 462 2,304 — 2,304 Income property 7,342 — 104 (342 ) 7,104 25 7,079 Owner occupied 6,439 — 114 269 6,822 — 6,822 Real estate construction: One-to-four family residential: Land and acquisition 316 (14 ) 61 (71 ) 292 — 292 Residential construction 669 — 46 396 1,111 — 1,111 Commercial & multifamily residential: Income property 404 — — 860 1,264 — 1,264 Owner occupied 1,192 — — 103 1,295 — 1,295 Consumer 3,534 (1,156 ) 876 419 3,673 51 3,622 Purchased credit impaired 10,515 (5,372 ) 3,737 (1,536 ) 7,344 — 7,344 Unallocated 226 — — 765 991 — 991 Total $ 70,043 $ (13,091 ) $ 9,360 $ 5,304 $ 71,616 $ 102 $ 71,514 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Three months ended September 30, 2016 (in thousands) Commercial business: Secured $ 31,808 $ (2,128 ) $ 787 $ 2,008 $ 32,475 $ 873 $ 31,602 Unsecured 1,265 (31 ) 67 (128 ) 1,173 — 1,173 Real estate: One-to-four family residential 675 — 81 221 977 353 624 Commercial & multifamily residential: Commercial land 1,422 — — 92 1,514 — 1,514 Income property 8,046 — 10 149 8,205 28 8,177 Owner occupied 6,336 — 10 487 6,833 — 6,833 Real estate construction: One-to-four family residential: Land and acquisition 587 — 2 (134 ) 455 — 455 Residential construction 1,376 — 19 (393 ) 1,002 — 1,002 Commercial & multifamily residential: Income property 904 — 107 (480 ) 531 — 531 Owner occupied 1,384 — — 57 1,441 — 1,441 Consumer 3,559 (383 ) 399 168 3,743 46 3,697 Purchased credit impaired 11,781 (2,062 ) 2,216 (433 ) 11,502 — 11,502 Unallocated 161 — — 252 413 — 413 Total $ 69,304 $ (4,604 ) $ 3,698 $ 1,866 $ 70,264 $ 1,300 $ 68,964 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Nine months ended September 30, 2016 (in thousands) Commercial business: Secured $ 32,321 $ (8,798 ) $ 2,126 $ 6,826 $ 32,475 $ 873 $ 31,602 Unsecured 1,299 (75 ) 143 (194 ) 1,173 — 1,173 Real estate: One-to-four family residential 916 (35 ) 142 (46 ) 977 353 624 Commercial & multifamily residential: Commercial land 1,178 (26 ) 2 360 1,514 — 1,514 Income property 6,616 — 191 1,398 8,205 28 8,177 Owner occupied 5,550 — 26 1,257 6,833 — 6,833 Real estate construction: One-to-four family residential: Land and acquisition 339 — 55 61 455 — 455 Residential construction 733 — 225 44 1,002 — 1,002 Commercial & multifamily residential: Income property 388 — 109 34 531 — 531 Owner occupied 1,006 — — 435 1,441 — 1,441 Consumer 3,531 (983 ) 765 430 3,743 46 3,697 Purchased credit impaired 13,726 (7,826 ) 5,291 311 11,502 — 11,502 Unallocated 569 — — (156 ) 413 — 413 Total $ 68,172 $ (17,743 ) $ 9,075 $ 10,760 $ 70,264 $ 1,300 $ 68,964 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 Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ 3,555 $ 2,780 $ 2,705 $ 2,930 Net changes in the allowance for unfunded commitments and letters of credit (75 ) 125 775 (25 ) Balance at end of period $ 3,480 $ 2,905 $ 3,480 $ 2,905 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 September 30, 2017 and December 31, 2016 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2017 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 2,464,772 $ 69,577 $ 101,697 $ — $ — $ 2,636,046 Unsecured 92,881 — 1,043 — — 93,924 Real estate: One-to-four family residential 171,362 1,195 1,933 — — 174,490 Commercial and multifamily residential: Commercial land 276,675 5,527 3,452 — — 285,654 Income property 1,356,196 1,797 24,905 — — 1,382,898 Owner occupied 1,101,139 14,275 25,194 — — 1,140,608 Real estate construction: One-to-four family residential: Land and acquisition 6,787 — 26 — — 6,813 Residential construction 135,965 406 1,549 — — 137,920 Commercial and multifamily residential: Income property 156,727 15,385 — — — 172,112 Owner occupied 35,511 — 4,050 — — 39,561 Consumer 312,828 — 8,675 — — 321,503 Total $ 6,110,843 $ 108,162 $ 172,524 $ — $ — 6,391,529 Less: Allowance for loan and lease losses 64,272 Loans, excluding PCI loans, net $ 6,327,257 Pass Special Mention Substandard Doubtful Loss Total December 31, 2016 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 2,289,307 $ 65,846 $ 96,437 $ — $ — $ 2,451,590 Unsecured 93,721 800 216 — — 94,737 Real estate: One-to-four family residential 164,797 395 2,740 — — 167,932 Commercial and multifamily residential: Commercial land 263,195 3,228 4,391 — — 270,814 Income property 1,341,978 17,902 9,866 — — 1,369,746 Owner occupied 1,027,019 6,608 26,351 — — 1,059,978 Real estate construction: One-to-four family residential: Land and acquisition 11,541 — 15 — — 11,556 Residential construction 108,941 — 688 — — 109,629 Commercial and multifamily residential: Income property 103,779 — — — — 103,779 Owner occupied 98,948 88 4,444 — — 103,480 Consumer 317,728 — 6,794 — — 324,522 Total $ 5,820,954 $ 94,867 $ 151,942 $ — $ — 6,067,763 Less: Allowance for loan and lease losses 59,528 Loans, excluding PCI loans, net $ 6,008,235 The following is an analysis of the credit quality of our PCI loan portfolio as of September 30, 2017 and December 31, 2016 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2017 (in thousands) PCI loans: Commercial business: Secured $ 13,353 $ — $ 761 $ — $ — $ 14,114 Unsecured 714 — 67 — — 781 Real estate: One-to-four family residential 15,883 — 815 — — 16,698 Commercial and multifamily residential: Commercial land 9,854 — — — — 9,854 Income property 26,174 — — — — 26,174 Owner occupied 46,265 — 789 — — 47,054 Real estate construction: One-to-four family residential: Land and acquisition 319 — 58 — — 377 Commercial and multifamily residential: Income property 773 — — — — 773 Owner occupied 286 — — — — 286 Consumer 12,321 — 718 — — 13,039 Total $ 125,942 $ — $ 3,208 $ — $ — 129,150 Less: Valuation discount resulting from acquisition accounting 8,673 Allowance for loan losses 7,344 PCI loans, net $ 113,133 Pass Special Mention Substandard Doubtful Loss Total December 31, 2016 (in thousands) PCI loans: Commercial business: Secured $ 18,824 $ 92 $ 1,954 $ — $ — $ 20,870 Unsecured 736 — — — — 736 Real estate: One-to-four family residential 19,293 — 1,350 — — 20,643 Commercial and multifamily residential: Commercial land 7,333 — 213 — — 7,546 Income property 31,042 — 1,678 — — 32,720 Owner occupied 53,623 — 906 — — 54,529 Real estate construction: One-to-four family residential: Land and acquisition 744 — 88 — — 832 Commercial and multifamily residential: Income property 1,217 — — — — 1,217 Owner occupied 509 — — — — 509 Consumer 17,202 — 447 — — 17,649 Total $ 150,523 $ 92 $ 6,636 $ — $ — 157,251 Less: Valuation discount resulting from acquisition accounting 11,591 Allowance for loan losses 10,515 PCI loans, net $ 135,145

Other Real Estate Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance, beginning of period $ 4,058 $ 10,613 $ 5,998 $ 13,738 Transfers in 74 891 74 1,202 Valuation adjustments (138 ) (14 ) (364 ) (290 ) Proceeds from sale of OREO property (182 ) (2,569 ) (1,901 ) (5,845 ) Gain (loss) on sale of OREO, net (130 ) 73 (125 ) 189 Balance, end of period $ 3,682 $ 8,994 $ 3,682 $ 8,994 At September 30, 2017 , there were $74 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 $686 thousand .

Covered Assets and FDIC Loss-sh

Covered Assets and FDIC Loss-sharing Asset	9 Months Ended
	Sep. 30, 2017
Covered Assets And FDIC Loss Sharing Asset
Covered Assets and FDIC Loss sharing Asset	FDIC Loss-sharing Asset and Covered Assets During the second quarter of 2017, we entered into an agreement with the FDIC to terminate all loss-sharing agreements ahead of their contractual maturities. These loss-sharing agreements were entered into in 2010 and 2011 in conjunction with our acquisitions of (1) Columbia River Bank in January 2010, (2) American Marine Bank in January 2010, (3) Summit Bank in May 2011 and (4) First Heritage Bank in May 2011. Under the early termination, all rights and obligations of the Company and the FDIC have been resolved and completed. The Company paid the FDIC $4.7 million as consideration for early termination. The early termination was recorded in the Company’s financial statements by removing the remaining FDIC loss-sharing asset of $3.1 million and the remaining FDIC clawback liability of $5.4 million and recording a one-time, pre-tax charge on termination of $2.4 million , recorded to “Other” noninterest expense. Prior to entering into the termination agreement, the Company had $74.0 million of non-single family covered assets and $26.4 million of single family covered assets at March 31, 2017. As a result of the termination agreement, the Company will benefit from all future recoveries, and be responsible for all future losses and expenses related to the assets previously subject to the loss-sharing agreements. The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ — $ 4,266 $ 3,535 $ 6,568 Adjustments not reflected in income: Cash paid to (received from) the FDIC, net — 20 184 (23 ) FDIC shared recoveries, net — (590 ) (149 ) (756 ) Termination of FDIC loss-sharing agreements — — (3,123 ) — Adjustments reflected in noninterest income (1): Amortization, net — (315 ) (414 ) (2,530 ) Loan impairment — 266 40 393 Sale of other real estate — (49 ) 18 71 Valuation adjustments of other real estate owned — — — (22 ) Other — (6 ) (91 ) (109 ) Balance at end of period $ — $ 3,592 $ — $ 3,592 __________ (1) Amounts shown in the table above for adjustments reflected in noninterest income include only those adjustments recorded to the noninterest income line item “Change in FDIC loss-sharing asset” in the Consolidated Statements of Income and do not include the charge related to the termination of the FDIC loss-sharing agreements.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2017
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 Company performed an annual impairment assessment as of July 31, 2017 and concluded that there was no impairment. 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 September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Goodwill Total goodwill $ 382,762 $ 382,762 $ 382,762 $ 382,762 Other intangible assets, net Core deposit intangible: Gross core deposit intangible balance at beginning of period 58,598 58,598 58,598 58,598 Accumulated amortization at beginning of period (44,484 ) (39,006 ) (41,886 ) (35,940 ) Core deposit intangible, net at beginning of period 14,114 19,592 16,712 22,658 CDI current period amortization (1,188 ) (1,460 ) (3,786 ) (4,526 ) Total core deposit intangible, net at end of period 12,926 18,132 12,926 18,132 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 13,845 19,051 13,845 19,051 Total goodwill and other intangible assets at end of period $ 396,607 $ 401,813 $ 396,607 $ 401,813 The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2017 and the succeeding four years: Amount (in thousands) Year ending December 31, 2017 $ 1,127 2018 3,855 2019 2,951 2020 2,048 2021 1,440

Derivatives and Balance Sheet O

Derivatives and Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 was $380.0 million and $309.3 million , respectively. During the three and nine months ended September 30, 2017 , mark-to-market gain s of $6 thousand and $12 thousand were recorded to “Other” noninterest expense. During the three and nine months ended September 30, 2016 , mark-to-market gain s of $9 thousand and $2 thousand were recorded to “Other” noninterest expense. The following table presents the fair value of derivatives not designated as hedging instruments at September 30, 2017 and December 31, 2016 : Asset Derivatives Liability Derivatives September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Interest rate contracts Other assets $ 8,992 Other assets $ 9,012 Other liabilities $ 9,004 Other liabilities $ 9,036 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 September 30, 2017 (in thousands) Assets Interest rate contracts $ 8,992 $ — $ 8,992 $ — $ 8,992 Liabilities Interest rate contracts $ 9,004 $ — $ 9,004 $ (9,004 ) $ — Repurchase agreements $ 40,933 $ — $ 40,933 $ (40,933 ) $ — December 31, 2016 Assets Interest rate contracts $ 9,012 $ — $ 9,012 $ — $ 9,012 Liabilities Interest rate contracts $ 9,036 $ — $ 9,036 $ (9,036 ) $ — Repurchase agreements $ 80,822 $ — $ 80,822 $ (80,822 ) $ — 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 September 30, 2017 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 15,933 $ — $ — $ 25,000 $ 40,933 Gross amount of recognized liabilities for repurchase agreements 40,933 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 term wholesale repurchase agreement, which matures in 2018, is monitored on a monthly basis and additional capital is pledged when necessary. The pledged collateral related to the Company’s 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.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2017
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 2017 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. Sale-leaseback transactions: On August 11, 2017 , the Company sold one of its Idaho facilities and leased back the portion of the facility utilized for branch operations. The lease term is through August 2027, with monthly payments of approximately $26 thousand . The resulting gain on sale of $509 thousand was deferred in accordance with the Leases topic of the FASB ASC and is being amortized over the life of the respective lease. At September 30, 2017 , the deferred gain was $501 thousand and is included in “Other liabilities” on the Consolidated Balance Sheets. On August 24, 2016 , the Company sold one of its Washington facilities and leased back the portion of the facility utilized for branch operations. The lease term is through July 2026, with monthly payments of approximately $12 thousand . The resulting gain on sale of $742 thousand was deferred in accordance with the Leases topic of the FASB ASC and is being amortized over the life of the respective lease. At September 30, 2017 , the deferred gain was $661 thousand and is a component of "Other liabilities" in the Consolidated Balance Sheets. 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 September 30, 2017 and December 31, 2016 , the Company’s loan commitments amounted to $2.23 billion and $2.17 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 $50.1 million and $49.7 million at September 30, 2017 and December 31, 2016 , respectively. In addition, commitments under commercial letters of credit used to facilitate customers’ trade transactions and other off-balance sheet liabilities amounted to $2.9 million and $3.4 million at September 30, 2017 and December 31, 2016 , 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.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Preferred Stock: In conjunction with the 2013 acquisition of West Coast Bancorp, the Company issued 8,782 shares of mandatorily convertible cumulative participating preferred stock, Series B (“Series B Preferred Stock”). On January 12, 2017 , all outstanding shares of Series B Preferred Stock were converted to Company common stock. Dividends: On January 26, 2017 , the Company declared a quarterly cash dividend of $0.22 per common share payable on February 22, 2017 to shareholders of record at the close of business on February 8, 2017 . On April 27, 2017 , the Company declared a regular quarterly cash dividend of $0.22 per common share payable on May 24, 2017 to shareholders of record at the close of business on May 10, 2017 . On July 27, 2017 , the Company declared a regular quarterly cash dividend of $0.22 per common share payable on August 23, 2017 to shareholders of record at the close of business on August 9, 2017 . Subsequent to quarter end, on October 19, 2017 , the Company declared a regular quarterly cash dividend of $0.22 per common share payable on November 14, 2017 to shareholders of record at the close of business on October 31, 2017 . 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.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
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 and nine month periods ended September 30, 2017 and 2016 : Unrealized Gains and Losses on Available-for-Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Total (1) Three months ended September 30, 2017 (in thousands) Beginning balance $ (4,969 ) $ (1,559 ) $ (6,528 ) Other comprehensive income before reclassifications 549 — 549 Amounts reclassified from accumulated other comprehensive income — 46 46 Net current-period other comprehensive income 549 46 595 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Three months ended September 30, 2016 Beginning balance $ 27,280 $ (6,469 ) $ 20,811 Other comprehensive loss before reclassifications (4,049 ) — (4,049 ) Amounts reclassified from accumulated other comprehensive income (loss) (364 ) 107 (257 ) Net current-period other comprehensive income (loss) (4,413 ) 107 (4,306 ) Ending balance $ 22,867 $ (6,362 ) $ 16,505 Nine months ended September 30, 2017 Beginning balance $ (12,704 ) $ (6,295 ) $ (18,999 ) Other comprehensive income before reclassifications 8,284 4,604 12,888 Amounts reclassified from accumulated other comprehensive income — 178 178 Net current-period other comprehensive income 8,284 4,782 13,066 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Nine months ended September 30, 2016 Beginning balance $ 386 $ (6,681 ) $ (6,295 ) Other comprehensive income before reclassifications 23,229 — 23,229 Amounts reclassified from accumulated other comprehensive income (loss) (748 ) 319 (429 ) Net current-period other comprehensive income 22,481 319 22,800 Ending balance $ 22,867 $ (6,362 ) $ 16,505 __________ (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 and nine month periods ended September 30, 2017 and 2016 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, Affected line Item in the Consolidated 2017 2016 2017 2016 Statement of Income (in thousands) Unrealized gains and losses on available-for-sale securities Investment securities gains $ — $ 572 $ — $ 1,174 Investment securities gains, net — 572 — 1,174 Total before tax — (208 ) — (426 ) Income tax provision $ — $ 364 $ — $ 748 Net of tax Amortization of pension plan liability Actuarial losses $ (72 ) $ (167 ) $ (279 ) $ (501 ) Compensation and employee benefits (72 ) (167 ) (279 ) (501 ) Total before tax 26 60 101 182 Income tax benefit $ (46 ) $ (107 ) $ (178 ) $ (319 ) Net of tax

Fair Value Accounting and Measu

Fair Value Accounting and Measurement	9 Months Ended
	Sep. 30, 2017
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, 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 September 30, 2017 and December 31, 2016 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 September 30, 2017 (in thousands) Assets Securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,377,417 $ — $ 1,377,417 $ — State and municipal debt securities 483,488 — 483,488 — U.S. government agency and government-sponsored enterprise securities 341,604 — 341,604 — U.S. government securities 250 250 — — Other securities 5,114 — 5,114 — Total securities available for sale $ 2,207,873 $ 250 $ 2,207,623 $ — Other assets (Interest rate contracts) $ 8,992 $ — $ 8,992 $ — Liabilities Other liabilities (Interest rate contracts) $ 9,004 $ — $ 9,004 $ — Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2016 (in thousands) Assets Securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,465,732 $ — $ 1,465,732 $ — State and municipal debt securities 475,060 — 475,060 — U.S. government agency and government-sponsored enterprise securities 331,902 — 331,902 — U.S. government securities 800 800 — — Other securities 5,083 — 5,083 — Total securities available for sale $ 2,278,577 $ 800 $ 2,277,777 $ — Other assets (Interest rate contracts) $ 9,012 $ — $ 9,012 $ — Liabilities Other liabilities (Interest rate contracts) $ 9,036 $ — $ 9,036 $ — There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the nine month periods ended September 30, 2017 and 2016 . 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 Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended Level 1 Level 2 Level 3 (in thousands) Impaired loans $ 843 $ — $ — $ 843 $ 170 $ 170 OREO 625 — — 625 138 138 $ 1,468 $ — $ — $ 1,468 $ 308 $ 308 Fair value at Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended September 30, 2016 Level 1 Level 2 Level 3 (in thousands) Impaired loans $ 2,304 $ — $ — $ 2,304 $ 647 $ 3,285 OREO 335 — — 335 14 14 $ 2,639 $ — $ — $ 2,639 $ 661 $ 3,299 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 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Impaired loans - collateral-dependent (3) $ 715 Fair Market Value of Collateral Adjustment to Stated Value N/A (2) Impaired loans - other (4) $ 128 Discounted Cash Flow Discount Rate 7.75% OREO $ 625 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount rate used in discounted cash flow valuation. (2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period. (3) Collateral consists of a government agency guarantee. (4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided. Fair value at Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Impaired loans - collateral-dependent (3) $ 943 Fair Market Value of Collateral Adjustment to Stated Value N/A (2) Impaired loans - other $ 1,361 Discounted Cash Flow Discount Rate 2.85% - 6.50% (3.85%) OREO $ 335 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount rate used in discounted cash flow valuation. (2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period. (3) Collateral consists of fixed assets and accounts receivable. Fair value of financial instruments Because broadly traded markets do not exist for most of the Company’s financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. These determinations are subjective in nature, involve uncertainties and matters of significant judgment and do not include tax ramifications; therefore, the results cannot be determined with precision, substantiated by comparison to independent markets and may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein do not represent, and should not be construed to represent, the underlying value of the Company. The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value: Cash and due from banks and interest-earning deposits with banks —The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value that approximates carrying value (Level 1). Securities available for sale —Securities at fair value, other than U.S. Treasury Notes, are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors (Level 2). U.S. Treasury Notes are priced using quotes in active markets (Level 1). Federal Home Loan Bank stock —The fair value is based upon the par value of the stock which equates to its carrying value (Level 2). Loans held for sale —The carrying amount of loans held for sale approximates their fair values due to the short period of time between the origination and sale dates (Level 2). Loans —Loans are not recorded at fair value on a recurring basis . Nonrecurring fair value adjustments are periodically recorded on impaired loans that are measured for impairment based on the fair value of collateral. For most performing loans, fair value is estimated using expected duration and lending rates that would have been offered on September 30, 2017 or December 31, 2016 , for loans which mirror the attributes of the loans with similar rate structures and average maturities. The fair values resulting from these calculations are reduced by an amount representing the change in estimated fair value attributable to changes in borrowers’ credit quality since the loans were originated. For nonperforming loans, fair value is estimated by applying a valuation discount based upon loan sales data from the FDIC. For PCI loans, fair value is estimated by discounting the expected future cash flows using a lending rate that would have been offered on September 30, 2017 (Level 3). FDIC loss-sharing asset —The fair value of the FDIC loss-sharing asset was estimated based on discounting the expected future cash flows using an estimated market rate (Level 3). Interest rate contracts —Interest rate swap positions are valued in discounted cash flow models, which use readily observable market parameters as their basis (Level 2). Deposits —For deposits with no contractual maturity, the fair value is equal to the carrying value (Level 1). The fair value of fixed maturity deposits is based on discounted cash flows using the difference between the deposit rate and current market rates for deposits of similar remaining maturities (Level 2). FHLB advances —The fair value of FHLB advances is estimated based on discounting the future cash flows using the market rate currently offered (Level 2). Repurchase Agreements —The fair value of term repurchase agreements is estimated based on discounting the future cash flows using the market rate currently offered. The carrying amount of sweep repurchase agreements approximates their fair values due to the short period of time between repricing dates (Level 2). Other Financial Instruments —The majority of our commitments to extend credit and standby letters of credit carry current market interest rates if converted to loans, as such, carrying value is assumed to equal fair value. The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at September 30, 2017 and December 31, 2016 : September 30, 2017 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 186,116 $ 186,116 $ 186,116 $ — $ — Interest-earning deposits with banks 136,578 136,578 136,578 — — Securities available for sale 2,207,873 2,207,873 250 2,207,623 — FHLB stock 10,240 10,240 — 10,240 — Loans held for sale 7,802 7,802 — 7,802 — Loans 6,440,390 6,309,449 — — 6,309,449 Interest rate contracts 8,992 8,992 — 8,992 — Liabilities Deposits $ 8,341,717 $ 8,337,145 $ 7,960,870 $ 376,275 $ — FHLB advances 6,465 7,367 — 7,367 — Repurchase agreements 40,933 40,987 — 40,987 — Interest rate contracts 9,004 9,004 — 9,004 — December 31, 2016 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 193,038 $ 193,038 $ 193,038 $ — $ — Interest-earning deposits with banks 31,200 31,200 31,200 — — Securities available for sale 2,278,577 2,278,577 800 2,277,777 — FHLB stock 10,240 10,240 — 10,240 — Loans held for sale 5,846 5,846 — 5,846 — Loans 6,143,380 6,040,439 — — 6,040,439 FDIC loss-sharing asset 3,535 867 — — 867 Interest rate contracts 9,012 9,012 — 9,012 — Liabilities Deposits $ 8,059,415 $ 8,055,168 $ 7,653,122 $ 402,046 $ — FHLB advances 6,493 7,070 — 7,070 — Repurchase agreements 80,822 81,131 — 81,131 — Interest rate contracts 9,036 9,036 — 9,036 —

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands except per share) Basic EPS: Net income $ 40,769 $ 27,484 $ 97,100 $ 74,148 Less: Earnings allocated to participating securities: Preferred shares — 48 4 131 Nonvested restricted shares 558 378 1,325 953 Earnings allocated to common shareholders $ 40,211 $ 27,058 $ 95,771 $ 73,064 Weighted average common shares outstanding 57,566 57,215 57,459 57,173 Basic earnings per common share $ 0.70 $ 0.47 $ 1.67 $ 1.28 Diluted EPS: Earnings allocated to common shareholders $ 40,211 $ 27,058 $ 95,771 $ 73,064 Weighted average common shares outstanding 57,566 57,215 57,459 57,173 Dilutive effect of equity awards 5 10 6 10 Weighted average diluted common shares outstanding 57,571 57,225 57,465 57,183 Diluted earnings per common share $ 0.70 $ 0.47 $ 1.67 $ 1.28 Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive 12 15 13 20

Subsequent event

Subsequent event	9 Months Ended
	Sep. 30, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On November 1, 2017 , the Company completed its previously announced acquisition of Pacific Continental Corporation ("Pacific Continental"), for total consideration of approximately $644.8 million . The Company acquired 100% of the voting 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 operating results of the Company for the nine months ended September 30, 2017 do not include the operating results produced by Pacific Continental as the acquisition did not close until November 1, 2017. It is not practical to present other financial information related to the acquisition at this time because the fair value measurement of assets acquired and liabilities assumed has not been finalized.

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2017
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 securities available for sale: Amortized Gross Gross Fair Value (in thousands) September 30, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,391,636 $ 3,143 $ (17,362 ) $ 1,377,417 State and municipal securities 476,702 9,047 (2,261 ) 483,488 U.S. government agency and government-sponsored enterprise securities 341,462 1,372 (1,230 ) 341,604 U.S. government securities 251 — (1 ) 250 Other securities 5,284 82 (252 ) 5,114 Total $ 2,215,335 $ 13,644 $ (21,106 ) $ 2,207,873 December 31, 2016 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,486,690 $ 2,760 $ (23,718 ) $ 1,465,732 State and municipal securities 473,914 6,343 (5,197 ) 475,060 U.S. government agency and government-sponsored enterprise securities 332,348 1,065 (1,511 ) 331,902 U.S. government securities 801 — (1 ) 800 Other securities 5,284 63 (264 ) 5,083 Total $ 2,299,037 $ 10,231 $ (30,691 ) $ 2,278,577
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 the sales of securities for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands) Proceeds from sales of available for sale securities $ — $ 37,390 $ — $ 120,800 Gross realized gains $ — $ 572 $ — $ 1,174 Gross realized losses — — — — Net realized gains $ — $ 572 $ — $ 1,174
Schedule of Contractual Maturities of Investment Securities Available for Sale	The scheduled contractual maturities of investment securities available for sale at September 30, 2017 are presented as follows: September 30, 2017 Amortized Cost Fair Value (in thousands) Due within one year $ 108,477 $ 108,462 Due after one year through five years 506,439 509,784 Due after five years through ten years 672,288 671,188 Due after ten years 922,847 913,325 Other securities with no stated maturity 5,284 5,114 Total investment securities available-for-sale $ 2,215,335 $ 2,207,873
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: September 30, 2017 (in thousands) Washington and Oregon State to secure public deposits $ 242,188 Federal Reserve Bank to secure borrowings 54,723 Other securities pledged 122,392 Total securities pledged as collateral $ 419,303
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 investments 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 September 30, 2017 and December 31, 2016 : Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) September 30, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 537,162 $ (4,765 ) $ 456,330 $ (12,597 ) $ 993,492 $ (17,362 ) State and municipal securities 75,499 (700 ) 45,328 (1,561 ) 120,827 (2,261 ) U.S. government agency and government-sponsored enterprise securities 173,027 (665 ) 21,517 (565 ) 194,544 (1,230 ) U.S. government securities 250 (1 ) — — 250 (1 ) Other securities 2,278 (36 ) 2,740 (216 ) 5,018 (252 ) Total $ 788,216 $ (6,167 ) $ 525,915 $ (14,939 ) $ 1,314,131 $ (21,106 ) December 31, 2016 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,029,116 $ (18,788 ) $ 159,046 $ (4,930 ) $ 1,188,162 $ (23,718 ) State and municipal securities 211,342 (5,064 ) 3,384 (133 ) 214,726 (5,197 ) U.S. government agency and government-sponsored enterprise securities 218,811 (1,511 ) — — 218,811 (1,511 ) U.S. government securities 251 (1 ) — — 251 (1 ) Other securities 2,263 (51 ) 2,743 (213 ) 5,006 (264 ) Total $ 1,461,783 $ (25,415 ) $ 165,173 $ (5,276 ) $ 1,626,956 $ (30,691 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2017
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): September 30, 2017 December 31, 2016 Loans, excluding PCI loans PCI Loans Total Loans, excluding PCI loans PCI Loans Total (in thousands) Commercial business $ 2,735,206 $ 13,662 $ 2,748,868 $ 2,551,054 $ 20,185 $ 2,571,239 Real estate: One-to-four family residential 176,487 14,325 190,812 170,331 17,862 188,193 Commercial and multifamily residential 2,825,794 79,336 2,905,130 2,719,830 89,231 2,809,061 Total real estate 3,002,281 93,661 3,095,942 2,890,161 107,093 2,997,254 Real estate construction: One-to-four family residential 145,419 377 145,796 121,887 832 122,719 Commercial and multifamily residential 213,939 958 214,897 209,118 1,565 210,683 Total real estate construction 359,358 1,335 360,693 331,005 2,397 333,402 Consumer 323,913 11,819 335,732 329,261 15,985 345,246 Less: Net unearned income (29,229 ) — (29,229 ) (33,718 ) — (33,718 ) Total loans, net of unearned income 6,391,529 120,477 6,512,006 6,067,763 145,660 6,213,423 Less: Allowance for loan and lease losses (64,272 ) (7,344 ) (71,616 ) (59,528 ) (10,515 ) (70,043 ) Total loans, net $ 6,327,257 $ 113,133 $ 6,440,390 $ 6,008,235 $ 135,145 $ 6,143,380 Loans held for sale $ 7,802 $ — $ 7,802 $ 5,846 $ — $ 5,846
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 September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 Recorded Unpaid Principal Recorded Unpaid Principal (in thousands) Commercial business: Secured $ 25,187 $ 35,843 $ 11,524 $ 21,503 Unsecured 26 1,342 31 303 Real estate: One-to-four family residential 816 2,904 568 1,302 Commercial & multifamily residential: Commercial land 2,333 2,629 934 922 Income property 3,586 4,702 4,005 4,247 Owner occupied 3,224 4,712 6,248 9,030 Real estate construction: One-to-four family residential: Land and acquisition 26 803 14 102 Residential construction 213 2,568 549 549 Consumer 4,906 5,418 3,883 4,331 Total $ 40,317 $ 60,921 $ 27,756 $ 42,289
Analysis of the Aged Loan Portfolio	The following is an aging of the recorded investment of the loan portfolio as of September 30, 2017 and December 31, 2016 : Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans September 30, 2017 (in thousands) Commercial business: Secured $ 2,607,265 $ 2,292 $ 1,302 $ — $ 3,594 $ 25,187 $ 2,636,046 Unsecured 93,879 1 18 — 19 26 93,924 Real estate: One-to-four family residential 171,936 330 1,408 — 1,738 816 174,490 Commercial & multifamily residential: Commercial land 283,321 — — — — 2,333 285,654 Income property 1,375,163 1,493 2,656 — 4,149 3,586 1,382,898 Owner occupied 1,135,584 1,410 390 — 1,800 3,224 1,140,608 Real estate construction: One-to-four family residential: Land and acquisition 6,787 — — — — 26 6,813 Residential construction 137,707 — — — — 213 137,920 Commercial & multifamily residential: Income property 172,112 — — — — — 172,112 Owner occupied 39,561 — — — — — 39,561 Consumer 315,688 552 357 — 909 4,906 321,503 Total $ 6,339,003 $ 6,078 $ 6,131 $ — $ 12,209 $ 40,317 $ 6,391,529 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2016 (in thousands) Commercial business: Secured $ 2,439,250 $ 806 $ 10 $ — $ 816 $ 11,524 $ 2,451,590 Unsecured 94,118 287 301 — 588 31 94,737 Real estate: One-to-four family residential 164,416 2,448 500 — 2,948 568 167,932 Commercial & multifamily residential: Commercial land 269,816 64 — — 64 934 270,814 Income property 1,365,150 480 111 — 591 4,005 1,369,746 Owner occupied 1,052,078 1,652 — — 1,652 6,248 1,059,978 Real estate construction: One-to-four family residential: Land and acquisition 11,542 — — — — 14 11,556 Residential construction 109,080 — — — — 549 109,629 Commercial & multifamily residential: Income property 103,779 — — — — — 103,779 Owner occupied 103,480 — — — — — 103,480 Consumer 318,369 2,035 235 — 2,270 3,883 324,522 Total $ 6,031,078 $ 7,772 $ 1,157 $ — $ 8,929 $ 27,756 $ 6,067,763
Impaired Financing Receivables	The following is an analysis of impaired loans as of September 30, 2017 and December 31, 2016 : Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid September 30, 2017 (in thousands) Commercial business: Secured $ 2,614,647 $ 21,399 $ — $ — $ — $ 21,399 $ 26,655 Unsecured 93,924 — — — — — — Real estate: One-to-four family residential 173,562 928 459 736 26 469 1,030 Commercial & multifamily residential: Commercial land 283,355 2,299 — — — 2,299 2,287 Income property 1,378,127 4,771 519 523 25 4,252 4,570 Owner occupied 1,134,945 5,663 — — — 5,663 8,573 Real estate construction: One-to-four family residential: Land and acquisition 6,813 — — — — — — Residential construction 137,920 — — — — — — Commercial & multifamily residential: Income property 172,112 — — — — — — Owner occupied 35,511 4,050 — — — 4,050 4,050 Consumer 315,038 6,465 5,692 5,982 51 773 914 Total $ 6,345,954 $ 45,575 $ 6,670 $ 7,241 $ 102 $ 38,905 $ 48,079 Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid December 31, 2016 (in thousands) Commercial business: Secured $ 2,442,772 $ 8,818 $ 2,414 $ 2,484 $ 664 $ 6,404 $ 12,831 Unsecured 94,737 — — — — — — Real estate: One-to-four family residential 167,403 529 435 693 12 94 291 Commercial & multifamily residential: Commercial land 270,106 708 — — — 708 687 Income property 1,365,321 4,425 540 544 27 3,885 4,148 Owner occupied 1,054,564 5,414 — — — 5,414 8,102 Real estate construction: One-to-four family residential: Land and acquisition 11,542 14 14 102 1 — — Residential construction 109,293 336 — — — 336 336 Commercial & multifamily residential: Income property 103,779 — — — — — — Owner occupied 103,480 — — — — — — Consumer 319,307 5,215 4,464 4,558 57 751 833 Total $ 6,042,304 $ 25,459 $ 7,867 $ 8,381 $ 761 $ 17,592 $ 27,228 The following table provides additional information on impaired loans for the three and nine month periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized (in thousands) Commercial business: Secured $ 22,395 $ 2 $ 6,909 $ 15 $ 15,349 $ 25 $ 9,506 $ 48 Unsecured — — — — — — — — Real estate: One-to-four family residential 856 15 617 5 688 37 796 8 Commercial & multifamily residential: Commercial land 2,549 — 708 — 2,026 — 354 — Income property 4,214 21 1,939 8 4,137 27 2,010 19 Owner occupied 4,530 127 4,486 — 4,496 319 5,001 — Real estate construction: One-to-four family residential: Land and acquisition — — 103 1 4 — 245 4 Residential construction — — 449 — 84 — 506 — Commercial & multifamily residential: Owner occupied 2,025 151 — — 1,012 151 — — Consumer 6,054 58 3,345 25 5,712 105 2,084 46 Total $ 42,623 $ 374 $ 18,556 $ 54 $ 33,508 $ 664 $ 20,502 $ 125
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 and nine months ended September 30, 2017 and 2016 : Three months ended September 30, 2017 Three months ended September 30, 2016 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 2 $ 808 $ 808 2 $ 90 $ 90 Real estate: One-to-four family residential 2 201 201 1 85 85 Commercial and multifamily residential: Income property 1 1,152 1,152 — — — Owner occupied 1 78 78 — — — Real estate construction: Commercial and multifamily residential: Owner occupied 1 4,050 4,050 — — — Consumer 17 1,672 1,672 10 731 731 Total 24 $ 7,961 $ 7,961 13 $ 906 $ 906 Nine months ended September 30, 2017 Nine months ended September 30, 2016 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 7 $ 2,586 $ 2,586 7 $ 1,753 $ 1,753 Real estate: One-to-four family residential 3 583 583 2 115 115 Commercial and multifamily residential: Income property 1 1,152 1,152 — — — Owner occupied 1 78 78 1 250 250 Real estate construction: Commercial and multifamily residential: Owner occupied 1 4,050 4,050 — — — Consumer 35 4,033 4,033 28 3,442 3,442 Total 48 $ 12,482 $ 12,482 38 $ 5,560 $ 5,560
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 September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (in thousands) Commercial business $ 14,895 $ 21,606 Real estate: One-to-four family residential 16,698 20,643 Commercial and multifamily residential 83,082 94,795 Total real estate 99,780 115,438 Real estate construction: One-to-four family residential 377 832 Commercial and multifamily residential 1,059 1,726 Total real estate construction 1,436 2,558 Consumer 13,039 17,649 Subtotal of PCI loans 129,150 157,251 Less: Valuation discount resulting from acquisition accounting 8,673 11,591 Allowance for loan losses 7,344 10,515 PCI loans, net of allowance for loan losses $ 113,133 $ 135,145
Changes in Accretable Yield for Acquired Loans	The following table shows the changes in accretable yield for PCI loans for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ 35,706 $ 52,909 $ 45,191 $ 58,981 Accretion (2,766 ) (4,902 ) (9,830 ) (12,905 ) Disposals — (178 ) (158 ) (157 ) Reclassifications from (to) nonaccretable difference (892 ) 1,034 (3,155 ) 2,944 Balance at end of period $ 32,048 $ 48,863 $ 32,048 $ 48,863

Allowance for Loan and Lease 26

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Three months ended September 30, 2017 (in thousands) Commercial business: Secured $ 39,539 $ (1,362 ) $ 550 $ (969 ) $ 37,758 $ — $ 37,758 Unsecured 1,147 — 138 (298 ) 987 — 987 Real estate: One-to-four family residential 628 — 40 3 671 26 645 Commercial & multifamily residential: Commercial land 2,356 — 45 (97 ) 2,304 — 2,304 Income property 6,854 — 9 241 7,104 25 7,079 Owner occupied 6,512 — 4 306 6,822 — 6,822 Real estate construction: One-to-four family residential: Land and acquisition 361 — 14 (83 ) 292 — 292 Residential construction 1,377 — 6 (272 ) 1,111 — 1,111 Commercial & multifamily residential: Income property 985 — — 279 1,264 — 1,264 Owner occupied 1,382 — — (87 ) 1,295 — 1,295 Consumer 3,551 (263 ) 343 42 3,673 51 3,622 Purchased credit impaired 8,061 (1,633 ) 1,389 (473 ) 7,344 — 7,344 Unallocated 231 — — 760 991 — 991 Total $ 72,984 $ (3,258 ) $ 2,538 $ (648 ) $ 71,616 $ 102 $ 71,514 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Nine months ended September 30, 2017 (in thousands) Commercial business: Secured $ 36,050 $ (6,071 ) $ 3,750 $ 4,029 $ 37,758 $ — $ 37,758 Unsecured 960 (18 ) 247 (202 ) 987 — 987 Real estate: One-to-four family residential 599 (460 ) 380 152 671 26 645 Commercial & multifamily residential: Commercial land 1,797 — 45 462 2,304 — 2,304 Income property 7,342 — 104 (342 ) 7,104 25 7,079 Owner occupied 6,439 — 114 269 6,822 — 6,822 Real estate construction: One-to-four family residential: Land and acquisition 316 (14 ) 61 (71 ) 292 — 292 Residential construction 669 — 46 396 1,111 — 1,111 Commercial & multifamily residential: Income property 404 — — 860 1,264 — 1,264 Owner occupied 1,192 — — 103 1,295 — 1,295 Consumer 3,534 (1,156 ) 876 419 3,673 51 3,622 Purchased credit impaired 10,515 (5,372 ) 3,737 (1,536 ) 7,344 — 7,344 Unallocated 226 — — 765 991 — 991 Total $ 70,043 $ (13,091 ) $ 9,360 $ 5,304 $ 71,616 $ 102 $ 71,514 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Three months ended September 30, 2016 (in thousands) Commercial business: Secured $ 31,808 $ (2,128 ) $ 787 $ 2,008 $ 32,475 $ 873 $ 31,602 Unsecured 1,265 (31 ) 67 (128 ) 1,173 — 1,173 Real estate: One-to-four family residential 675 — 81 221 977 353 624 Commercial & multifamily residential: Commercial land 1,422 — — 92 1,514 — 1,514 Income property 8,046 — 10 149 8,205 28 8,177 Owner occupied 6,336 — 10 487 6,833 — 6,833 Real estate construction: One-to-four family residential: Land and acquisition 587 — 2 (134 ) 455 — 455 Residential construction 1,376 — 19 (393 ) 1,002 — 1,002 Commercial & multifamily residential: Income property 904 — 107 (480 ) 531 — 531 Owner occupied 1,384 — — 57 1,441 — 1,441 Consumer 3,559 (383 ) 399 168 3,743 46 3,697 Purchased credit impaired 11,781 (2,062 ) 2,216 (433 ) 11,502 — 11,502 Unallocated 161 — — 252 413 — 413 Total $ 69,304 $ (4,604 ) $ 3,698 $ 1,866 $ 70,264 $ 1,300 $ 68,964 Beginning Charge-offs Recoveries Provision (Recovery) Ending Specific General Nine months ended September 30, 2016 (in thousands) Commercial business: Secured $ 32,321 $ (8,798 ) $ 2,126 $ 6,826 $ 32,475 $ 873 $ 31,602 Unsecured 1,299 (75 ) 143 (194 ) 1,173 — 1,173 Real estate: One-to-four family residential 916 (35 ) 142 (46 ) 977 353 624 Commercial & multifamily residential: Commercial land 1,178 (26 ) 2 360 1,514 — 1,514 Income property 6,616 — 191 1,398 8,205 28 8,177 Owner occupied 5,550 — 26 1,257 6,833 — 6,833 Real estate construction: One-to-four family residential: Land and acquisition 339 — 55 61 455 — 455 Residential construction 733 — 225 44 1,002 — 1,002 Commercial & multifamily residential: Income property 388 — 109 34 531 — 531 Owner occupied 1,006 — — 435 1,441 — 1,441 Consumer 3,531 (983 ) 765 430 3,743 46 3,697 Purchased credit impaired 13,726 (7,826 ) 5,291 311 11,502 — 11,502 Unallocated 569 — — (156 ) 413 — 413 Total $ 68,172 $ (17,743 ) $ 9,075 $ 10,760 $ 70,264 $ 1,300 $ 68,964
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 Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ 3,555 $ 2,780 $ 2,705 $ 2,930 Net changes in the allowance for unfunded commitments and letters of credit (75 ) 125 775 (25 ) Balance at end of period $ 3,480 $ 2,905 $ 3,480 $ 2,905
Financing Receivable Credit Quality Indicators	The following is an analysis of the credit quality of our loan portfolio, excluding PCI loans, as of September 30, 2017 and December 31, 2016 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2017 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 2,464,772 $ 69,577 $ 101,697 $ — $ — $ 2,636,046 Unsecured 92,881 — 1,043 — — 93,924 Real estate: One-to-four family residential 171,362 1,195 1,933 — — 174,490 Commercial and multifamily residential: Commercial land 276,675 5,527 3,452 — — 285,654 Income property 1,356,196 1,797 24,905 — — 1,382,898 Owner occupied 1,101,139 14,275 25,194 — — 1,140,608 Real estate construction: One-to-four family residential: Land and acquisition 6,787 — 26 — — 6,813 Residential construction 135,965 406 1,549 — — 137,920 Commercial and multifamily residential: Income property 156,727 15,385 — — — 172,112 Owner occupied 35,511 — 4,050 — — 39,561 Consumer 312,828 — 8,675 — — 321,503 Total $ 6,110,843 $ 108,162 $ 172,524 $ — $ — 6,391,529 Less: Allowance for loan and lease losses 64,272 Loans, excluding PCI loans, net $ 6,327,257 Pass Special Mention Substandard Doubtful Loss Total December 31, 2016 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 2,289,307 $ 65,846 $ 96,437 $ — $ — $ 2,451,590 Unsecured 93,721 800 216 — — 94,737 Real estate: One-to-four family residential 164,797 395 2,740 — — 167,932 Commercial and multifamily residential: Commercial land 263,195 3,228 4,391 — — 270,814 Income property 1,341,978 17,902 9,866 — — 1,369,746 Owner occupied 1,027,019 6,608 26,351 — — 1,059,978 Real estate construction: One-to-four family residential: Land and acquisition 11,541 — 15 — — 11,556 Residential construction 108,941 — 688 — — 109,629 Commercial and multifamily residential: Income property 103,779 — — — — 103,779 Owner occupied 98,948 88 4,444 — — 103,480 Consumer 317,728 — 6,794 — — 324,522 Total $ 5,820,954 $ 94,867 $ 151,942 $ — $ — 6,067,763 Less: Allowance for loan and lease losses 59,528 Loans, excluding PCI loans, net $ 6,008,235 The following is an analysis of the credit quality of our PCI loan portfolio as of September 30, 2017 and December 31, 2016 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2017 (in thousands) PCI loans: Commercial business: Secured $ 13,353 $ — $ 761 $ — $ — $ 14,114 Unsecured 714 — 67 — — 781 Real estate: One-to-four family residential 15,883 — 815 — — 16,698 Commercial and multifamily residential: Commercial land 9,854 — — — — 9,854 Income property 26,174 — — — — 26,174 Owner occupied 46,265 — 789 — — 47,054 Real estate construction: One-to-four family residential: Land and acquisition 319 — 58 — — 377 Commercial and multifamily residential: Income property 773 — — — — 773 Owner occupied 286 — — — — 286 Consumer 12,321 — 718 — — 13,039 Total $ 125,942 $ — $ 3,208 $ — $ — 129,150 Less: Valuation discount resulting from acquisition accounting 8,673 Allowance for loan losses 7,344 PCI loans, net $ 113,133 Pass Special Mention Substandard Doubtful Loss Total December 31, 2016 (in thousands) PCI loans: Commercial business: Secured $ 18,824 $ 92 $ 1,954 $ — $ — $ 20,870 Unsecured 736 — — — — 736 Real estate: One-to-four family residential 19,293 — 1,350 — — 20,643 Commercial and multifamily residential: Commercial land 7,333 — 213 — — 7,546 Income property 31,042 — 1,678 — — 32,720 Owner occupied 53,623 — 906 — — 54,529 Real estate construction: One-to-four family residential: Land and acquisition 744 — 88 — — 832 Commercial and multifamily residential: Income property 1,217 — — — — 1,217 Owner occupied 509 — — — — 509 Consumer 17,202 — 447 — — 17,649 Total $ 150,523 $ 92 $ 6,636 $ — $ — 157,251 Less: Valuation discount resulting from acquisition accounting 11,591 Allowance for loan losses 10,515 PCI loans, net $ 135,145

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance, beginning of period $ 4,058 $ 10,613 $ 5,998 $ 13,738 Transfers in 74 891 74 1,202 Valuation adjustments (138 ) (14 ) (364 ) (290 ) Proceeds from sale of OREO property (182 ) (2,569 ) (1,901 ) (5,845 ) Gain (loss) on sale of OREO, net (130 ) 73 (125 ) 189 Balance, end of period $ 3,682 $ 8,994 $ 3,682 $ 8,994

Covered Assets and FDIC Loss-28

Covered Assets and FDIC Loss-sharing Asset (Tables)	9 Months Ended
	Sep. 30, 2017
Covered Assets And FDIC Loss Sharing Asset [Line Items]
FDIC Loss-sharing Asset	The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and nine months ended September 30, 2017 and 2016 : Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Balance at beginning of period $ — $ 4,266 $ 3,535 $ 6,568 Adjustments not reflected in income: Cash paid to (received from) the FDIC, net — 20 184 (23 ) FDIC shared recoveries, net — (590 ) (149 ) (756 ) Termination of FDIC loss-sharing agreements — — (3,123 ) — Adjustments reflected in noninterest income (1): Amortization, net — (315 ) (414 ) (2,530 ) Loan impairment — 266 40 393 Sale of other real estate — (49 ) 18 71 Valuation adjustments of other real estate owned — — — (22 ) Other — (6 ) (91 ) (109 ) Balance at end of period $ — $ 3,592 $ — $ 3,592 __________ (1) Amounts shown in the table above for adjustments reflected in noninterest income include only those adjustments recorded to the noninterest income line item “Change in FDIC loss-sharing asset” in the Consolidated Statements of Income and do not include the charge related to the termination of the FDIC loss-sharing agreements.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, Nine Months Ended September 30, 2017 2016 2017 2016 (in thousands) Goodwill Total goodwill $ 382,762 $ 382,762 $ 382,762 $ 382,762 Other intangible assets, net Core deposit intangible: Gross core deposit intangible balance at beginning of period 58,598 58,598 58,598 58,598 Accumulated amortization at beginning of period (44,484 ) (39,006 ) (41,886 ) (35,940 ) Core deposit intangible, net at beginning of period 14,114 19,592 16,712 22,658 CDI current period amortization (1,188 ) (1,460 ) (3,786 ) (4,526 ) Total core deposit intangible, net at end of period 12,926 18,132 12,926 18,132 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 13,845 19,051 13,845 19,051 Total goodwill and other intangible assets at end of period $ 396,607 $ 401,813 $ 396,607 $ 401,813
Estimated Future Amortization Expense of Core Deposit Intangibles	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2017 and the succeeding four years: Amount (in thousands) Year ending December 31, 2017 $ 1,127 2018 3,855 2019 2,951 2020 2,048 2021 1,440

Derivatives and Balance Sheet30

Derivatives and Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 (in thousands) Assets Interest rate contracts $ 8,992 $ — $ 8,992 $ — $ 8,992 Liabilities Interest rate contracts $ 9,004 $ — $ 9,004 $ (9,004 ) $ — Repurchase agreements $ 40,933 $ — $ 40,933 $ (40,933 ) $ — December 31, 2016 Assets Interest rate contracts $ 9,012 $ — $ 9,012 $ — $ 9,012 Liabilities Interest rate contracts $ 9,036 $ — $ 9,036 $ (9,036 ) $ — Repurchase agreements $ 80,822 $ — $ 80,822 $ (80,822 ) $ —
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: September 30, 2017 (in thousands) Washington and Oregon State to secure public deposits $ 242,188 Federal Reserve Bank to secure borrowings 54,723 Other securities pledged 122,392 Total securities pledged as collateral $ 419,303
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 September 30, 2017 and December 31, 2016 : Asset Derivatives Liability Derivatives September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Interest rate contracts Other assets $ 8,992 Other assets $ 9,012 Other liabilities $ 9,004 Other liabilities $ 9,036
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 September 30, 2017 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 15,933 $ — $ — $ 25,000 $ 40,933 Gross amount of recognized liabilities for repurchase agreements 40,933 Amounts related to agreements not included in offsetting disclosure $ —

Accumulated Other Comprehensi31

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine month periods ended September 30, 2017 and 2016 : Unrealized Gains and Losses on Available-for-Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Total (1) Three months ended September 30, 2017 (in thousands) Beginning balance $ (4,969 ) $ (1,559 ) $ (6,528 ) Other comprehensive income before reclassifications 549 — 549 Amounts reclassified from accumulated other comprehensive income — 46 46 Net current-period other comprehensive income 549 46 595 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Three months ended September 30, 2016 Beginning balance $ 27,280 $ (6,469 ) $ 20,811 Other comprehensive loss before reclassifications (4,049 ) — (4,049 ) Amounts reclassified from accumulated other comprehensive income (loss) (364 ) 107 (257 ) Net current-period other comprehensive income (loss) (4,413 ) 107 (4,306 ) Ending balance $ 22,867 $ (6,362 ) $ 16,505 Nine months ended September 30, 2017 Beginning balance $ (12,704 ) $ (6,295 ) $ (18,999 ) Other comprehensive income before reclassifications 8,284 4,604 12,888 Amounts reclassified from accumulated other comprehensive income — 178 178 Net current-period other comprehensive income 8,284 4,782 13,066 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Nine months ended September 30, 2016 Beginning balance $ 386 $ (6,681 ) $ (6,295 ) Other comprehensive income before reclassifications 23,229 — 23,229 Amounts reclassified from accumulated other comprehensive income (loss) (748 ) 319 (429 ) Net current-period other comprehensive income 22,481 319 22,800 Ending balance $ 22,867 $ (6,362 ) $ 16,505 __________ (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 and nine month periods ended September 30, 2017 and 2016 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, Affected line Item in the Consolidated 2017 2016 2017 2016 Statement of Income (in thousands) Unrealized gains and losses on available-for-sale securities Investment securities gains $ — $ 572 $ — $ 1,174 Investment securities gains, net — 572 — 1,174 Total before tax — (208 ) — (426 ) Income tax provision $ — $ 364 $ — $ 748 Net of tax Amortization of pension plan liability Actuarial losses $ (72 ) $ (167 ) $ (279 ) $ (501 ) Compensation and employee benefits (72 ) (167 ) (279 ) (501 ) Total before tax 26 60 101 182 Income tax benefit $ (46 ) $ (107 ) $ (178 ) $ (319 ) Net of tax

Fair Value Accounting and Mea32

Fair Value Accounting and Measurement (Tables)	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 and December 31, 2016 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 September 30, 2017 (in thousands) Assets Securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,377,417 $ — $ 1,377,417 $ — State and municipal debt securities 483,488 — 483,488 — U.S. government agency and government-sponsored enterprise securities 341,604 — 341,604 — U.S. government securities 250 250 — — Other securities 5,114 — 5,114 — Total securities available for sale $ 2,207,873 $ 250 $ 2,207,623 $ — Other assets (Interest rate contracts) $ 8,992 $ — $ 8,992 $ — Liabilities Other liabilities (Interest rate contracts) $ 9,004 $ — $ 9,004 $ — Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2016 (in thousands) Assets Securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,465,732 $ — $ 1,465,732 $ — State and municipal debt securities 475,060 — 475,060 — U.S. government agency and government-sponsored enterprise securities 331,902 — 331,902 — U.S. government securities 800 800 — — Other securities 5,083 — 5,083 — Total securities available for sale $ 2,278,577 $ 800 $ 2,277,777 $ — Other assets (Interest rate contracts) $ 9,012 $ — $ 9,012 $ — Liabilities Other liabilities (Interest rate contracts) $ 9,036 $ — $ 9,036 $ —
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 Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended Level 1 Level 2 Level 3 (in thousands) Impaired loans $ 843 $ — $ — $ 843 $ 170 $ 170 OREO 625 — — 625 138 138 $ 1,468 $ — $ — $ 1,468 $ 308 $ 308 Fair value at Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended September 30, 2016 Level 1 Level 2 Level 3 (in thousands) Impaired loans $ 2,304 $ — $ — $ 2,304 $ 647 $ 3,285 OREO 335 — — 335 14 14 $ 2,639 $ — $ — $ 2,639 $ 661 $ 3,299
Fair Value, by Balance Sheet Grouping	The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at September 30, 2017 and December 31, 2016 : September 30, 2017 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 186,116 $ 186,116 $ 186,116 $ — $ — Interest-earning deposits with banks 136,578 136,578 136,578 — — Securities available for sale 2,207,873 2,207,873 250 2,207,623 — FHLB stock 10,240 10,240 — 10,240 — Loans held for sale 7,802 7,802 — 7,802 — Loans 6,440,390 6,309,449 — — 6,309,449 Interest rate contracts 8,992 8,992 — 8,992 — Liabilities Deposits $ 8,341,717 $ 8,337,145 $ 7,960,870 $ 376,275 $ — FHLB advances 6,465 7,367 — 7,367 — Repurchase agreements 40,933 40,987 — 40,987 — Interest rate contracts 9,004 9,004 — 9,004 — December 31, 2016 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 193,038 $ 193,038 $ 193,038 $ — $ — Interest-earning deposits with banks 31,200 31,200 31,200 — — Securities available for sale 2,278,577 2,278,577 800 2,277,777 — FHLB stock 10,240 10,240 — 10,240 — Loans held for sale 5,846 5,846 — 5,846 — Loans 6,143,380 6,040,439 — — 6,040,439 FDIC loss-sharing asset 3,535 867 — — 867 Interest rate contracts 9,012 9,012 — 9,012 — Liabilities Deposits $ 8,059,415 $ 8,055,168 $ 7,653,122 $ 402,046 $ — FHLB advances 6,493 7,070 — 7,070 — Repurchase agreements 80,822 81,131 — 81,131 — Interest rate contracts 9,036 9,036 — 9,036 —
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 Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Impaired loans - collateral-dependent (3) $ 715 Fair Market Value of Collateral Adjustment to Stated Value N/A (2) Impaired loans - other (4) $ 128 Discounted Cash Flow Discount Rate 7.75% OREO $ 625 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount rate used in discounted cash flow valuation. (2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period. (3) Collateral consists of a government agency guarantee. (4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided. Fair value at Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Impaired loans - collateral-dependent (3) $ 943 Fair Market Value of Collateral Adjustment to Stated Value N/A (2) Impaired loans - other $ 1,361 Discounted Cash Flow Discount Rate 2.85% - 6.50% (3.85%) OREO $ 335 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount rate used in discounted cash flow valuation. (2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period. (3) Collateral consists of fixed assets and accounts receivable.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 : Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 (in thousands except per share) Basic EPS: Net income $ 40,769 $ 27,484 $ 97,100 $ 74,148 Less: Earnings allocated to participating securities: Preferred shares — 48 4 131 Nonvested restricted shares 558 378 1,325 953 Earnings allocated to common shareholders $ 40,211 $ 27,058 $ 95,771 $ 73,064 Weighted average common shares outstanding 57,566 57,215 57,459 57,173 Basic earnings per common share $ 0.70 $ 0.47 $ 1.67 $ 1.28 Diluted EPS: Earnings allocated to common shareholders $ 40,211 $ 27,058 $ 95,771 $ 73,064 Weighted average common shares outstanding 57,566 57,215 57,459 57,173 Dilutive effect of equity awards 5 10 6 10 Weighted average diluted common shares outstanding 57,571 57,225 57,465 57,183 Diluted earnings per common share $ 0.70 $ 0.47 $ 1.67 $ 1.28 Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive 12 15 13 20

Basis of Presentation and Sig34

Basis of Presentation and Significant Accounting Policies Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain on sale of merchant card services portfolio	$ 14,000,000		$ 0	$ 14,000,000	$ 0
Merchant Card Services Agreement [Member]
Net carrying amount of merchant card services portfolio upon sale		$ 0
Net revenue share - merchant card services	438,000
Gain on sale of merchant card services portfolio	$ 14,000,000

Accounting Pronouncements Rec35

Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - Accounting Standards Update 2016-09 [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 67
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 22	$ 1,300
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share		$ 0.02
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			(117)
Common Stock [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 184

Securities (Securities Availabl

Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 0	$ 37,390	$ 0	$ 120,800
Securities available-for-sale, amortized cost	2,215,335		2,215,335		$ 2,299,037
Available-for-sale Debt Securities Gross Unrealized Gain, instant	13,644		13,644		10,231
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(21,106)		(21,106)		(30,691)
Securities available for sale	2,207,873		2,207,873		2,278,577
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	1,391,636		1,391,636		1,486,690
Available-for-sale Debt Securities Gross Unrealized Gain, instant	3,143		3,143		2,760
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(17,362)		(17,362)		(23,718)
Securities available for sale	1,377,417		1,377,417		1,465,732
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	476,702		476,702		473,914
Available-for-sale Debt Securities Gross Unrealized Gain, instant	9,047		9,047		6,343
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2,261)		(2,261)		(5,197)
Securities available for sale	483,488		483,488		475,060
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	341,462		341,462		332,348
Available-for-sale Debt Securities Gross Unrealized Gain, instant	1,372		1,372		1,065
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1,230)		(1,230)		(1,511)
Securities available for sale	341,604		341,604		331,902
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	251		251		801
Available-for-sale Debt Securities Gross Unrealized Gain, instant	0		0		0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(1)		(1)		(1)
Securities available for sale	250		250		800
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available-for-sale, amortized cost	5,284		5,284		5,284
Available-for-sale Debt Securities Gross Unrealized Gain, instant	82		82		63
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(252)		(252)		(264)
Securities available for sale	$ 5,114		$ 5,114		$ 5,083

Securities (Schedule of Contrac

Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Available-for-sale Securities [Abstract]
Due within one year, Amortized Cost	$ 108,477
Due after one year through five years, Amortized Cost	506,439
Due after five years through ten years, Amortized Cost	672,288
Due after ten years, Amortized Cost	922,847
No stated maturity date, Amortized Cost Basis	5,284
Total investment securities available-for-sale, Amortized Cost	2,215,335
Due within one year, Fair Value	108,462
Due after one year through five years, Fair Value	509,784
Due after five years through ten years, Fair Value	671,188
Due after ten years, Fair Value	913,325
No stated maturity date, Fair Value	5,114
Total investment securities available-for-sale, Fair Value	$ 2,207,873

Securities (Carrying Value of S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	$ 419,303
Washington and Oregon State Public Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	242,188
Federal Reserve Bank Advances [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	54,723
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying amount of securities pledged as collateral	$ 122,392

Securities (Summary of Gross Un

Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain, instant	$ 13,644	$ 10,231
Less than 12 Months Fair Value	788,216	1,461,783
Less than 12 Months Unrealized Losses	(6,167)	(25,415)
12 Months or More Fair Value	525,915	165,173
12 Months or More Unrealized Losses	(14,939)	(5,276)
Total Fair Value	1,314,131	1,626,956
Total Unrealized Losses	(21,106)	(30,691)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	21,106	30,691
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 Debt Securities Gross Unrealized Gain, instant	3,143	2,760
Less than 12 Months Fair Value	537,162	1,029,116
Less than 12 Months Unrealized Losses	(4,765)	(18,788)
12 Months or More Fair Value	456,330	159,046
12 Months or More Unrealized Losses	(12,597)	(4,930)
Total Fair Value	993,492	1,188,162
Total Unrealized Losses	(17,362)	(23,718)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	17,362	23,718
State and Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain, instant	9,047	6,343
Less than 12 Months Fair Value	75,499	211,342
Less than 12 Months Unrealized Losses	(700)	(5,064)
12 Months or More Fair Value	45,328	3,384
12 Months or More Unrealized Losses	(1,561)	(133)
Total Fair Value	120,827	214,726
Total Unrealized Losses	(2,261)	(5,197)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,261	5,197
US Government Corporations and Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain, instant	1,372	1,065
Less than 12 Months Fair Value	173,027	218,811
Less than 12 Months Unrealized Losses	(665)	(1,511)
12 Months or More Fair Value	21,517	0
12 Months or More Unrealized Losses	(565)	0
Total Fair Value	194,544	218,811
Total Unrealized Losses	(1,230)	(1,511)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,230	1,511
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain, instant	0	0
Less than 12 Months Fair Value	250	251
Less than 12 Months Unrealized Losses	(1)	(1)
12 Months or More Fair Value	0	0
12 Months or More Unrealized Losses	0	0
Total Fair Value	250	251
Total Unrealized Losses	(1)	(1)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1	1
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain, instant	82	63
Less than 12 Months Fair Value	2,278	2,263
Less than 12 Months Unrealized Losses	(36)	(51)
12 Months or More Fair Value	2,740	2,743
12 Months or More Unrealized Losses	(216)	(213)
Total Fair Value	5,018	5,006
Total Unrealized Losses	(252)	(264)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 252	$ 264

Securities (Narrative) (Details

Securities (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)security	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)security	Sep. 30, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $	$ 0	$ 37,390	$ 0	$ 120,800
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	168		168
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	84		84
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	107		107
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	40		40
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	22		22
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	5		5
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		0
Number Of Securities In Unrealized Loss Position	1		1
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	2		2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1		1

Securities Securities (Summary

Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 0	$ 37,390	$ 0	$ 120,800
Available-for-sale Securities, Gross Realized Gains	0	572	0	1,174
Available-for-sale Securities, Gross Realized Losses	0	0	0	0
Investment securities gains, net	$ 0	$ 572	$ 0	$ 1,174

Loans (Narrative) (Details)

Loans (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)contract	Sep. 30, 2016contract	Sep. 30, 2017USD ($)contract	Sep. 30, 2016contract	Dec. 31, 2016USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans to related parties	$ 10,100		$ 10,100		$ 10,100
Loans and Leases Receivable, Related Parties, Additions			203
Repayments on related party loans			$ 253
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	0	0
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 2,260,000		$ 2,260,000		2,290,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 69,800		$ 69,800		$ 54,200

Loans (Analysis of Loan Portfol

Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	$ (29,229)		$ (33,718)
Recorded Investment	6,512,006		6,213,423
Allowance for loan losses	(71,616)	$ (72,984)	(70,043)	$ (70,264)	$ (69,304)	$ (68,172)
Loans, net	6,440,390		6,143,380
Loans held for sale	7,802		5,846
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	(29,229)		(33,718)
Recorded Investment	6,391,529		6,067,763
Allowance for loan losses	(64,272)		(59,528)
Loans, net	6,327,257		6,008,235
Loans held for sale	7,802		5,846
Loans and Leases Receivable, Gross	6,391,529		6,067,763
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	0		0
Recorded Investment	120,477		145,660
Allowance for loan losses	(7,344)		(10,515)
Loans, net	113,133		135,145
Loans held for sale	0		0
Loans and Leases Receivable, Gross	129,150		157,251
Acquisition Accounting Valuation Discount on Covered Loans	8,673		11,591
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,059		1,726
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	190,812		188,193
Loans and Leases Receivable, Gross, Consumer, Construction	145,796		122,719
Allowance for loan losses	(671)	(628)	(599)	(977)	(675)	(916)
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	176,487		170,331
Loans and Leases Receivable, Gross, Consumer, Construction	145,419		121,887
Loans and Leases Receivable, Gross	174,490		167,932
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	14,325		17,862
Loans and Leases Receivable, Gross, Consumer, Construction	377		832
Loans and Leases Receivable, Gross	16,698		20,643
Commercial and Multifamily Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	2,905,130		2,809,061
Loans Receivable, Gross, Commercial, Construction	214,897		210,683
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	2,825,794		2,719,830
Loans Receivable, Gross, Commercial, Construction	213,939		209,118
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	79,336		89,231
Loans Receivable, Gross, Commercial, Construction	958		1,565
Loans and Leases Receivable, Gross	83,082		94,795
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	2,748,868		2,571,239
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	2,735,206		2,551,054
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	13,662		20,185
Loans and Leases Receivable, Gross	14,895		21,606
Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	3,095,942		2,997,254
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	3,002,281		2,890,161
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	93,661		107,093
Loans and Leases Receivable, Gross	99,780		115,438
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	377		832
Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	360,693		333,402
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	359,358		331,005
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	1,335		2,397
Loans and Leases Receivable, Gross	1,436		2,558
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	335,732		345,246
Allowance for loan losses	(3,673)	$ (3,551)	(3,534)	$ (3,743)	$ (3,559)	$ (3,531)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	323,913		329,261
Loans and Leases Receivable, Gross	321,503		324,522
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	11,819		15,985
Loans and Leases Receivable, Gross	$ 13,039		$ 17,649

Loans (Analysis of Nonaccrual L

Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 40,317	$ 27,756
Unpaid Principal Balance Nonaccrual Loans	60,921	42,289
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	25,187	11,524
Unpaid Principal Balance Nonaccrual Loans	35,843	21,503
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	26	31
Unpaid Principal Balance Nonaccrual Loans	1,342	303
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	816	568
Unpaid Principal Balance Nonaccrual Loans	2,904	1,302
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,333	934
Unpaid Principal Balance Nonaccrual Loans	2,629	922
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,586	4,005
Unpaid Principal Balance Nonaccrual Loans	4,702	4,247
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	3,224	6,248
Unpaid Principal Balance Nonaccrual Loans	4,712	9,030
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	26	14
Unpaid Principal Balance Nonaccrual Loans	803	102
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	213	549
Unpaid Principal Balance Nonaccrual Loans	2,568	549
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	4,906	3,883
Unpaid Principal Balance Nonaccrual Loans	$ 5,418	$ 4,331

Loans (Analysis of the Aged Loa

Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 40,317	$ 27,756
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	6,339,003	6,031,078
Past Due Loans	12,209	8,929
Nonaccrual Loans	40,317	27,756
Loans Receivable, Net	6,391,529	6,067,763
Secured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	25,187	11,524
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	2,607,265	2,439,250
Past Due Loans	3,594	816
Nonaccrual Loans	25,187	11,524
Loans Receivable, Net	2,636,046	2,451,590
Unsecured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	26	31
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	93,879	94,118
Past Due Loans	19	588
Nonaccrual Loans	26	31
Loans Receivable, Net	93,924	94,737
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	816	568
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	171,936	164,416
Past Due Loans	1,738	2,948
Nonaccrual Loans	816	568
Loans Receivable, Net	174,490	167,932
Commercial Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	2,333	934
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	283,321	269,816
Past Due Loans	0	64
Nonaccrual Loans	2,333	934
Loans Receivable, Net	285,654	270,814
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	3,586	4,005
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,375,163	1,365,150
Past Due Loans	4,149	591
Nonaccrual Loans	3,586	4,005
Loans Receivable, Net	1,382,898	1,369,746
Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	3,224	6,248
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,135,584	1,052,078
Past Due Loans	1,800	1,652
Nonaccrual Loans	3,224	6,248
Loans Receivable, Net	1,140,608	1,059,978
Land And Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	26	14
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	6,787	11,542
Past Due Loans	0	0
Nonaccrual Loans	26	14
Loans Receivable, Net	6,813	11,556
Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	213	549
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	137,707	109,080
Past Due Loans	0	0
Nonaccrual Loans	213	549
Loans Receivable, Net	137,920	109,629
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	172,112	103,779
Past Due Loans	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	172,112	103,779
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	39,561	103,480
Past Due Loans	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	39,561	103,480
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	4,906	3,883
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	315,688	318,369
Past Due Loans	909	2,270
Nonaccrual Loans	4,906	3,883
Loans Receivable, Net	321,503	324,522
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	6,131	1,157
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	1,302	10
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	18	301
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	1,408	500
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	2,656	111
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	390	0
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	0	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	357	235
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	6,078	7,772
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	2,292	806
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	1	287
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	330	2,448
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	0	64
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	1,493	480
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	1,410	1,652
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	0	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	0	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	0	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	552	2,035
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	0
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	0
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

Loans (Analysis of Impaired Loa

Loans (Analysis of Impaired Loans) (Details) - Loans, Excluding Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 6,345,954		$ 6,345,954		$ 6,042,304
Recorded Investment of Loans Individually Measured for Specific Impairment	45,575		45,575		25,459
Recorded Investment	38,905		38,905		17,592
Unpaid Principal Balance	48,079		48,079		27,228
Related Allowance	102		102		761
Average Recorded Investment Impaired Loans	42,623	$ 18,556	33,508	$ 20,502
Interest Recognized on Impaired Loans	374	54	664	125
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	2,614,647		2,614,647		2,442,772
Recorded Investment of Loans Individually Measured for Specific Impairment	21,399		21,399		8,818
Recorded Investment	0		0		2,414
Unpaid Principal Balance	0		0		2,484
Related Allowance	0		0		664
Average Recorded Investment Impaired Loans	22,395	6,909	15,349	9,506
Interest Recognized on Impaired Loans	2	15	25	48
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	93,924		93,924		94,737
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	0	0	0	0
Interest Recognized on Impaired Loans	0	0	0	0
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	173,562		173,562		167,403
Recorded Investment of Loans Individually Measured for Specific Impairment	928		928		529
Recorded Investment	459		459		435
Unpaid Principal Balance	736		736		693
Related Allowance	26		26		12
Average Recorded Investment Impaired Loans	856	617	688	796
Interest Recognized on Impaired Loans	15	5	37	8
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	283,355		283,355		270,106
Recorded Investment of Loans Individually Measured for Specific Impairment	2,299		2,299		708
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	2,549	708	2,026	354
Interest Recognized on Impaired Loans	0	0	0	0
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,378,127		1,378,127		1,365,321
Recorded Investment of Loans Individually Measured for Specific Impairment	4,771		4,771		4,425
Recorded Investment	519		519		540
Unpaid Principal Balance	523		523		544
Related Allowance	25		25		27
Average Recorded Investment Impaired Loans	4,214	1,939	4,137	2,010
Interest Recognized on Impaired Loans	21	8	27	19
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,134,945		1,134,945		1,054,564
Recorded Investment of Loans Individually Measured for Specific Impairment	5,663		5,663		5,414
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	4,530	4,486	4,496	5,001
Interest Recognized on Impaired Loans	127	0	319	0
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	6,813		6,813		11,542
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		14
Recorded Investment	0		0		14
Unpaid Principal Balance	0		0		102
Related Allowance	0		0		1
Average Recorded Investment Impaired Loans	0	103	4	245
Interest Recognized on Impaired Loans	0	1	0	4
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	137,920		137,920		109,293
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		336
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	0	449	84	506
Interest Recognized on Impaired Loans	0	0	0	0
Income Property Multifamily Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	172,112		172,112		103,779
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Owner Occupied Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	35,511		35,511		103,480
Recorded Investment of Loans Individually Measured for Specific Impairment	4,050		4,050		0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	2,025	0	1,012	0
Interest Recognized on Impaired Loans	151	0	151	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	315,038		315,038		319,307
Recorded Investment of Loans Individually Measured for Specific Impairment	6,465		6,465		5,215
Recorded Investment	5,692		5,692		4,464
Unpaid Principal Balance	5,982		5,982		4,558
Related Allowance	51		51		57
Average Recorded Investment Impaired Loans	6,054	3,345	5,712	2,084
Interest Recognized on Impaired Loans	58	$ 25	105	$ 46
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	6,670		6,670		7,867
Unpaid Principal Balance	7,241		7,241		8,381
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	21,399		21,399		6,404
Unpaid Principal Balance	26,655		26,655		12,831
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	469		469		94
Unpaid Principal Balance	1,030		1,030		291
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,299		2,299		708
Unpaid Principal Balance	2,287		2,287		687
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,252		4,252		3,885
Unpaid Principal Balance	4,570		4,570		4,148
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	5,663		5,663		5,414
Unpaid Principal Balance	8,573		8,573		8,102
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0		336
Unpaid Principal Balance	0		0		336
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,050		4,050		0
Unpaid Principal Balance	4,050		4,050		0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	773		773		751
Unpaid Principal Balance	$ 914		$ 914		$ 833

Loans Loans (Analysis of Troubl

Loans Loans (Analysis of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)Modificationscontract	Sep. 30, 2016USD ($)Modificationscontract	Sep. 30, 2017USD ($)Modificationscontract	Sep. 30, 2016USD ($)Modificationscontract	Dec. 31, 2016USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	0	0
Loans and Leases Receivable, Related Parties	$ 10,100		$ 10,100		$ 10,100
Financing Receivable Modifications Additional Commitment To Lend	$ 529		$ 529		$ 508
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	24	13	48	38
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 7,961	$ 906	$ 12,482	$ 5,560
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 7,961	$ 906	$ 12,482	$ 5,560
Loans, Excluding Purchased Credit Impaired Loans [Member] | Secured Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	2	2	7	7
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 808	$ 90	$ 2,586	$ 1,753
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 808	$ 90	$ 2,586	$ 1,753
Loans, Excluding Purchased Credit Impaired Loans [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	2	1	3	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 201	$ 85	$ 583	$ 115
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 201	$ 85	$ 583	$ 115
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	1	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,152	$ 0	$ 1,152	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,152	$ 0	$ 1,152	$ 0
Loans, Excluding Purchased Credit Impaired Loans [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	1	0	1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 78	$ 0	$ 78	$ 250
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 78	$ 0	$ 78	$ 250
Loans, Excluding Purchased Credit Impaired Loans [Member] | Owner Occupied Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	1	0	1	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 4,050	$ 0	$ 4,050	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 4,050	$ 0	$ 4,050	$ 0
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	17	10	35	28
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,672	$ 731	$ 4,033	$ 3,442
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,672	$ 731	$ 4,033	$ 3,442

Loans Loans (Analysis of Purcha

Loans Loans (Analysis of Purchased Credit Impaired Loans - Accretable Yield Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Loans, Analysis of Purchased Credit Impaired Loans, Accretable Yield Rollforward [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 32,048	$ 48,863	$ 32,048	$ 48,863	$ 35,706	$ 45,191	$ 52,909	$ 58,981
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	2,766	4,902	9,830	12,905
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	0	178	158	157
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	$ (892)	$ 1,034	$ (3,155)	$ 2,944

Allowance for Loan and Lease 49

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (recapture) for loan and lease losses	$ (648)	$ 1,866	$ 5,304	$ 10,760

Allowance for Loan and Lease 50

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 72,984	$ 69,304	$ 70,043	$ 68,172
Charged-offs	(3,258)	(4,604)	(13,091)	(17,743)
Recoveries	2,538	3,698	9,360	9,075
Provision (recapture) for loan and lease losses	(648)	1,866	5,304	10,760
Ending balance	71,616	70,264	71,616	70,264
Specific Reserve	102	1,300	102	1,300
General Allocation	71,514	68,964	71,514	68,964
Secured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	39,539	31,808	36,050	32,321
Charged-offs	(1,362)	(2,128)	(6,071)	(8,798)
Recoveries	550	787	3,750	2,126
Provision (recapture) for loan and lease losses	(969)	2,008	4,029	6,826
Ending balance	37,758	32,475	37,758	32,475
Specific Reserve	0	873	0	873
General Allocation	37,758	31,602	37,758	31,602
Unsecured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,147	1,265	960	1,299
Charged-offs	0	(31)	(18)	(75)
Recoveries	138	67	247	143
Provision (recapture) for loan and lease losses	(298)	(128)	(202)	(194)
Ending balance	987	1,173	987	1,173
Specific Reserve	0	0	0	0
General Allocation	987	1,173	987	1,173
One-to-Four Family Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	628	675	599	916
Charged-offs	0	0	(460)	(35)
Recoveries	40	81	380	142
Provision (recapture) for loan and lease losses	3	221	152	(46)
Ending balance	671	977	671	977
Specific Reserve	26	353	26	353
General Allocation	645	624	645	624
Commercial Land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,356	1,422	1,797	1,178
Charged-offs	0	0	0	(26)
Recoveries	45	0	45	2
Provision (recapture) for loan and lease losses	(97)	92	462	360
Ending balance	2,304	1,514	2,304	1,514
Specific Reserve	0	0	0	0
General Allocation	2,304	1,514	2,304	1,514
Income Property Multifamily [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,854	8,046	7,342	6,616
Charged-offs	0	0	0	0
Recoveries	9	10	104	191
Provision (recapture) for loan and lease losses	241	149	(342)	1,398
Ending balance	7,104	8,205	7,104	8,205
Specific Reserve	25	28	25	28
General Allocation	7,079	8,177	7,079	8,177
Owner Occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,512	6,336	6,439	5,550
Charged-offs	0	0	0	0
Recoveries	4	10	114	26
Provision (recapture) for loan and lease losses	306	487	269	1,257
Ending balance	6,822	6,833	6,822	6,833
Specific Reserve	0	0	0	0
General Allocation	6,822	6,833	6,822	6,833
Land And Acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	361	587	316	339
Charged-offs	0	0	(14)	0
Recoveries	14	2	61	55
Provision (recapture) for loan and lease losses	(83)	(134)	(71)	61
Ending balance	292	455	292	455
Specific Reserve	0	0	0	0
General Allocation	292	455	292	455
Residential Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,377	1,376	669	733
Charged-offs	0	0	0	0
Recoveries	6	19	46	225
Provision (recapture) for loan and lease losses	(272)	(393)	396	44
Ending balance	1,111	1,002	1,111	1,002
Specific Reserve	0	0	0	0
General Allocation	1,111	1,002	1,111	1,002
Income Property Multifamily Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	985	904	404	388
Charged-offs	0	0	0	0
Recoveries	0	107	0	109
Provision (recapture) for loan and lease losses	279	(480)	860	34
Ending balance	1,264	531	1,264	531
Specific Reserve	0	0	0	0
General Allocation	1,264	531	1,264	531
Owner Occupied Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,382	1,384	1,192	1,006
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (recapture) for loan and lease losses	(87)	57	103	435
Ending balance	1,295	1,441	1,295	1,441
Specific Reserve	0	0	0	0
General Allocation	1,295	1,441	1,295	1,441
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,551	3,559	3,534	3,531
Charged-offs	(263)	(383)	(1,156)	(983)
Recoveries	343	399	876	765
Provision (recapture) for loan and lease losses	42	168	419	430
Ending balance	3,673	3,743	3,673	3,743
Specific Reserve	51	46	51	46
General Allocation	3,622	3,697	3,622	3,697
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,061	11,781	10,515	13,726
Charged-offs	(1,633)	(2,062)	(5,372)	(7,826)
Recoveries	1,389	2,216	3,737	5,291
Provision (recapture) for loan and lease losses	(473)	(433)	(1,536)	311
Ending balance	7,344	11,502	7,344	11,502
Specific Reserve	0	0	0	0
General Allocation	7,344	11,502	7,344	11,502
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	231	161	226	569
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (recapture) for loan and lease losses	760	252	765	(156)
Ending balance	991	413	991	413
Specific Reserve	0	0	0	0
General Allocation	$ 991	$ 413	$ 991	$ 413

Allowance for Loan and Lease 51

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit
Beginning balance	$ 3,555	$ 2,780	$ 2,705	$ 2,930
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	(75)	125	775	(25)
Ending balance	$ 3,480	$ 2,905	$ 3,480	$ 2,905

Allowance for Loan and Lease 52

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	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	$ 71,616	$ 72,984	$ 70,043	$ 70,264	$ 69,304	$ 68,172
Loans, net	6,440,390		6,143,380
Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,391,529		6,067,763
Less: allowance for loan and lease losses	64,272		59,528
Loans, net	6,327,257		6,008,235
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	129,150		157,251
Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans	8,673		11,591
Less: allowance for loan and lease losses	7,344		10,515
Loans, net	113,133		135,145
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,110,843		5,820,954
Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	125,942		150,523
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	108,162		94,867
Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		92
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	172,524		151,942
Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,208		6,636
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	37,758	39,539	36,050	32,475	31,808	32,321
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	2,636,046		2,451,590
Secured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	14,114		20,870
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	2,464,772		2,289,307
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	13,353		18,824
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	69,577		65,846
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		92
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	101,697		96,437
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	761		1,954
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	987	1,147	960	1,173	1,265	1,299
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	93,924		94,737
Unsecured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	781		736
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	92,881		93,721
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	714		736
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		800
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	1,043		216
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	67		0
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	671	628	599	977	675	916
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	174,490		167,932
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	16,698		20,643
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	171,362		164,797
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	15,883		19,293
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	1,195		395
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	1,933		2,740
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	815		1,350
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	2,304	2,356	1,797	1,514	1,422	1,178
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	285,654		270,814
Commercial Land [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	9,854		7,546
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	276,675		263,195
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	9,854		7,333
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	5,527		3,228
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		0
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	3,452		4,391
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		213
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	7,104	6,854	7,342	8,205	8,046	6,616
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	1,382,898		1,369,746
Income Property Multifamily [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	26,174		32,720
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	1,356,196		1,341,978
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	26,174		31,042
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	1,797		17,902
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	24,905		9,866
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		1,678
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	6,822	6,512	6,439	6,833	6,336	5,550
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	1,140,608		1,059,978
Owner Occupied [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	47,054		54,529
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	1,101,139		1,027,019
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	46,265		53,623
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	14,275		6,608
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	25,194		26,351
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	789		906
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	292	361	316	455	587	339
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	6,813		11,556
Land And Acquisition [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	377		832
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	6,787		11,541
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	319		744
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	26		15
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	58		88
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	1,111	1,377	669	1,002	1,376	733
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	137,920		109,629
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	135,965		108,941
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	406		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	1,549		688
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	1,264	985	404	531	904	388
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	172,112		103,779
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	773		1,217
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	156,727		103,779
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	773		1,217
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	15,385		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	0		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	1,295	1,382	1,192	1,441	1,384	1,006
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	39,561		103,480
Owner Occupied Construction [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	286		509
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	35,511		98,948
Owner Occupied Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	286		509
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		88
Owner Occupied 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
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	4,050		4,444
Owner Occupied 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
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] | 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 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
Owner Occupied 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
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	3,673	$ 3,551	3,534	$ 3,743	$ 3,559	$ 3,531
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	321,503		324,522
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	13,039		17,649
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	312,828		317,728
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	12,321		17,202
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	8,675		6,794
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	718		447
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

Other Real Estate Owned (Summar

Other Real Estate Owned (Summary of Other Real Estate Owned) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 4,058	$ 10,613	$ 5,998	$ 13,738
Transfers in	74	891	74	1,202
Valuation adjustments	(138)	(14)	(364)	(290)
Proceeds from Sale of OREO Property	182	2,569	1,901	5,845
Gain (loss) on sale of OREO, net	(130)	73	(125)	189
Total OREO, end of period	3,682	$ 8,994	3,682	$ 8,994
Mortgage Loans in Process of Foreclosure, Amount	686		686
One-to-Four Family Residential [Member]
Other Real Estate Owned [Line Items]
Total OREO, end of period	$ 74		$ 74

Covered Assets and FDIC Loss-54

Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Payment from (to) FDIC to terminate loss-sharing agreements				$ 4,666	$ 0
FDIC indemnification asset settlement	$ 0	$ 3,123	$ 0		0
FDIC clawback liability removal upon termination of loss-sharing agreements		$ 5,400
FDIC loss-sharing agreement early termination, pretax charge				$ 2,409	$ 0
Non-Single Family Covered Assets						$ 74,000
Single Family Covered Assets						$ 26,400

Covered Assets and FDIC Loss-55

Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Balance at beginning of period	$ 0		$ 4,266	$ 3,535	$ 6,568
Cash paid to (received from) the FDIC, net	0		20	184	(23)
FDIC reimbursable losses, net	0		(590)	(149)	(756)
FDIC indemnification asset settlement	0	$ (3,123)	0		0
Payment from (to) FDIC to terminate loss-sharing agreements				(4,666)	0
Amortization, net	0		(315)	(414)	(2,530)
Loan impairment	0		266	40	393
Sale of other real estate	0		(49)	18	71
Valuation adjustments of other real estate owned	0		0	0	(22)
Other	0		6	91	109
Balance at end of period	$ 0	$ 0	$ 3,592	$ 0	$ 3,592
Non-Single Family Covered Assets						$ 74,000
Single Family Covered Assets						$ 26,400

Goodwill and Intangible Asset56

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, beginning of period			$ 382,762
Total goodwill, end of period	$ 382,762	$ 382,762	382,762	$ 382,762
CDI current period amortization	(1,188)	(1,460)	(3,786)	(4,526)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	919	919	919	919
Other intangible assets, net	13,845	19,051	13,845	19,051		$ 17,631
Total goodwill and intangible assets, end of period	396,607	401,813	$ 396,607	401,813
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					$ 58,598	58,598	$ 58,598	$ 58,598
Accumulated amortization at beginning of period					$ (44,484)	$ (41,886)	$ (39,006)	$ (35,940)
Core deposit intangible, net, beginning of period	14,114	19,592	$ 16,712	22,658
CDI current period amortization	(1,188)	(1,460)	(3,786)	(4,526)
Total core deposit intangible, end of period	$ 12,926	$ 18,132	$ 12,926	$ 18,132

Goodwill and Intangible Asset57

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Future Amortization Expense For Core Deposit Intangibles
2,016	$ 1,127
2,017	3,855
2,018	2,951
2,019	2,048
2,020	$ 1,440

Derivatives and Balance Sheet58

Derivatives and Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 6	$ 9	$ 12	$ 2
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	40,933		40,933
Secured Borrowings, Gross, Difference, Amount	0		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	40,933		40,933
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	15,933		15,933
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		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		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	25,000		25,000
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	380,000		380,000		$ 309,300
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of asset derivative instruments	8,992		8,992		9,012
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of liability derivative instruments	$ 9,004		$ 9,004		$ 9,036

Derivatives and Balance Sheet59

Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Offsetting [Line Items]
Repurchase agreements, amounts offset in balance sheet	$ 0	$ 0
Repurchase agreements, net amount presented in statement of financial position	40,933	80,822
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(40,933)	(80,822)
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	8,992	9,012
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8,992	9,012
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	9,004	9,036
Derivative, Collateral, Right to Reclaim Securities	(9,004)	(9,036)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	0
Available-for-sale Securities [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	40,933	80,822
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Assets [Member]
Balance Sheet Offsetting [Line Items]
Fair value of asset derivative instruments	8,992	9,012
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Balance Sheet Offsetting [Line Items]
Fair value of liability derivative instruments	$ 9,004	$ 9,036

Commitments and Contingent Li60

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Aug. 11, 2017	Aug. 24, 2016	Sep. 30, 2017	Dec. 31, 2016
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability			$ 2,230,000	$ 2,170,000
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability			50,100	49,700
Commercial Letter of Credit and other off-balance sheet liabilities [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability			2,900	$ 3,400
IDAHO
Other Commitments [Line Items]
Sale Leaseback Transaction, Date	August 11, 2017
Sale Leaseback Transaction, Monthly Rental Payments			26
Sale Leaseback Transaction, Deferred Gain, Gross	$ 509
Sale Leaseback Transaction, Deferred Gain, Net			501
WASHINGTON
Other Commitments [Line Items]
Sale Leaseback Transaction, Date		August 24, 2016
Sale Leaseback Transaction, Monthly Rental Payments			12
Sale Leaseback Transaction, Deferred Gain, Gross		$ 742
Sale Leaseback Transaction, Deferred Gain, Net			$ 661

Shareholders' Equity (Details)

Shareholders' Equity (Details) - $ / shares	Oct. 19, 2017	Jul. 27, 2017	Apr. 27, 2017	Jan. 26, 2017
Subsequent Event [Line Items]
Declared quarterly cash dividend		$ 0.22	$ 0.22	$ 0.22
Subsequent Event [Member]
Subsequent Event [Line Items]
Declared quarterly cash dividend	$ 0.22

Accumulated Other Comprehensi62

Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (6,528)	$ 20,811	$ (18,999)	$ (6,295)
Other comprehensive income before reclassifications	[1]	549	(4,049)	12,888	23,229
Amounts reclassified from accumulated other comprehensive income	[1]	46	(257)	178	(429)
Net current-period other comprehensive income	[1]	595	(4,306)	13,066	22,800
Ending balance		(5,933)	16,505	(5,933)	16,505
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(4,969)	27,280	(12,704)	386
Other comprehensive income before reclassifications	[1]	549	(4,049)	8,284	23,229
Amounts reclassified from accumulated other comprehensive income	[1]	0	(364)	0	(748)
Net current-period other comprehensive income	[1]	549	(4,413)	8,284	22,481
Ending balance		(4,420)	22,867	(4,420)	22,867
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(1,559)	(6,469)	(6,295)	(6,681)
Other comprehensive income before reclassifications	[1]	0	0	4,604	0
Amounts reclassified from accumulated other comprehensive income	[1]	46	107	178	319
Net current-period other comprehensive income	[1]	46	107	4,782	319
Ending balance		$ (1,513)	$ (6,362)	$ (1,513)	$ (6,362)
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Accumulated Other Comprehensi63

Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net			$ 0	$ 1,174
Compensation and employee benefits	$ 39,983	$ 38,476	119,201	112,086
Total before tax	59,107	39,608	137,132	106,746
Income tax provision	(18,338)	(12,124)	(40,032)	(32,598)
Net income	40,769	27,484	97,100	74,148
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	0	572	0	1,174
Total before tax	0	572	0	1,174
Income tax provision	0	(208)	0	(426)
Net income	0	364	0	748
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	(72)	(167)	(279)	(501)
Total before tax	(72)	(167)	(279)	(501)
Income tax provision	26	60	101	182
Net income	$ (46)	$ (107)	$ (178)	$ (319)

Fair Value Accounting and Mea64

Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 2,207,873	$ 2,278,577
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	$ 2,207,873	2,278,577
Other assets (Interest rate contracts)	8,992	9,012
Other liabilities (Interest rate contracts)	9,004	9,036
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	250	800
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	2,207,623	2,277,777
Other assets (Interest rate contracts)	8,992	9,012
Other liabilities (Interest rate contracts)	9,004	9,036
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
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	1,377,417	1,465,732
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	1,377,417	1,465,732
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	483,488	475,060
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	483,488	475,060
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	341,604	331,902
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	341,604	331,902
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	250	800
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	250	800
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
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,114	5,083
Other 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
Other 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	5,114	5,083
Other 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

Fair Value Accounting and Mea65

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 843	$ 2,304	$ 843	$ 2,304
Fair Value, Option, Changes in Fair Value, Gain (Loss)	308	661	308	3,299
OREO	625	335	625	335
Assets, Fair Value Disclosure	1,468	2,639	1,468	2,639
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0	0	0
OREO	0	0	0	0
Assets, Fair Value Disclosure	0	0	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0	0	0
OREO	0	0	0	0
Assets, Fair Value Disclosure	0	0	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	843	2,304	843	2,304
OREO	625	335	625	335
Assets, Fair Value Disclosure	1,468	2,639	1,468	2,639
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)	170	647	170	3,285
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)	$ 138	$ 14	$ 138	$ 14

Fair Value Accounting and Mea66

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
	Sep. 30, 2017	Sep. 30, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 843	$ 2,304
OREO	625	335
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	843	2,304
OREO	625	335
Collateral Pledged [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	715	943
Uncollateralized [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 128	$ 1,361
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	7.75%	2.85%
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	7.75%	6.50%
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	7.75%	3.85%

Fair Value Accounting and Mea67

Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Interest-earning deposits with banks	$ 136,578	$ 31,200
Securities available for sale	2,207,873	2,278,577
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets
Cash and due from banks	186,116	193,038
Interest-earning deposits with banks	136,578	31,200
Securities available for sale	2,207,873	2,278,577
FHLB stock	10,240	10,240
Loans held for sale	7,802	5,846
Loans	6,440,390	6,143,380
FDIC loss-sharing asset		3,535
Interest rate contracts	8,992	9,012
Liabilities
Deposits	8,341,717	8,059,415
FHLB Advances	6,465	6,493
Repurchase agreements	40,933	80,822
Interest rate contracts	9,004	9,036
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets
Cash and due from banks	186,116	193,038
Interest-earning deposits with banks	136,578	31,200
Securities available for sale	2,207,873	2,278,577
FHLB stock	10,240	10,240
Loans held for sale	7,802	5,846
Loans	6,309,449	6,040,439
FDIC loss-sharing asset		867
Interest rate contracts	8,992	9,012
Liabilities
Deposits	8,337,145	8,055,168
FHLB Advances	7,367	7,070
Repurchase agreements	40,987	81,131
Interest rate contracts	9,004	9,036
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets
Cash and due from banks	186,116	193,038
Interest-earning deposits with banks	136,578	31,200
Securities available for sale	250	800
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
FDIC loss-sharing asset		0
Interest rate contracts	0	0
Liabilities
Deposits	7,960,870	7,653,122
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Securities available for sale	2,207,623	2,277,777
FHLB stock	10,240	10,240
Loans held for sale	7,802	5,846
Loans	0	0
FDIC loss-sharing asset		0
Interest rate contracts	8,992	9,012
Liabilities
Deposits	376,275	402,046
FHLB Advances	7,367	7,070
Repurchase agreements	40,987	81,131
Interest rate contracts	9,004	9,036
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Securities available for sale	0	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	6,309,449	6,040,439
FDIC loss-sharing asset		867
Interest rate contracts	0	0
Liabilities
Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	$ 0	$ 0

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 40,769	$ 27,484	$ 97,100	$ 74,148
Earnings allocated to participating securities - preferred shares	0	48	4	131
Earnings allocated to participating securities - nonvested restricted shares	558	378	1,325	953
Earnings allocated to common shareholders, Basic	$ 40,211	$ 27,058	$ 95,771	$ 73,064
Weighted average common shares outstanding	57,566	57,215	57,459	57,173
Basic earnings per common share	$ 0.70	$ 0.47	$ 1.67	$ 1.28
Earnings allocated to common shareholders, Diluted	$ 40,211	$ 27,058	$ 95,771	$ 73,064
Dilutive effect of equity awards and warrants	5	10	6	10
Weighted average diluted common shares outstanding	57,571	57,225	57,465	57,183
Diluted earnings per common share	$ 0.70	$ 0.47	$ 1.67	$ 1.28
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	12	15	13	20

Subsequent event (Details)

Subsequent event (Details) - Pacific Continental [Member] - Subsequent Event [Member] $ in Millions	Nov. 01, 2017USD ($)
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	Nov. 1, 2017
Business Combination, total consideration estimate	$ 644.8
Business Acquisition, Percentage of Voting Interests Acquired	100.00%