Columbia Banking System (COLB) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
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		73,257,775

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2018		Dec. 31, 2017
ASSETS
Cash and due from banks	$ 220,706		$ 244,615
Interest-earning deposits with banks	21,456		97,918
Total cash and cash equivalents	242,162		342,533
Debt Securities, Available-for-sale	2,921,114		2,737,751
Equity securities at fair value	4,901		5,080
Federal Home Loan Bank stock at cost	16,640		10,440
Loans held for sale	5,275		5,766
Loans, net of unearned income	8,514,317		8,358,657
Less: allowance for loan and lease losses	83,787		75,646
Loans, net	8,430,530		8,283,011
Interest receivable	48,476		40,881
Premises and equipment, net	169,681		169,490
Other real estate owned	7,331		13,298
Goodwill	765,842	[1]	765,842
Other intangible assets, net	48,827		58,173
Other assets	295,817		284,621
Total assets	12,956,596		12,716,886
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing	5,250,222		5,081,901
Interest-bearing	5,353,735		5,450,184
Total deposits	10,603,957		10,532,085
Federal Home Loan Bank advances	166,536		11,579
Securities sold under agreements to repurchase	62,197		79,059
Subordinated Debt	35,508		35,647
Junior Subordinated Notes	0		8,248
Other liabilities	107,003		100,346
Total liabilities	10,975,201		10,766,964
Commitments and contingent liabilities (Note 12)
Shareholders' equity:
Authorized shares	115,000		115,000
Common Stock Shares Issued And Outstanding	73,260		73,020
Common Stock (no par value)	$ 1,640,140		$ 1,634,705
Retained earnings	411,264		337,442
Accumulated other comprehensive loss	(70,009)		(22,225)
Total shareholders’ equity	1,981,395		1,949,922
Total liabilities and shareholders’ equity	$ 12,956,596		$ 12,716,886
[1]	See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - shares shares in Thousands	Sep. 30, 2018	Dec. 31, 2017
Authorized shares	115,000	115,000
Common stock, shares outstanding	73,260	73,020

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest Income
Loans	$ 109,748	$ 78,641	$ 318,187	$ 228,340
Taxable securities	14,654	8,718	39,285	29,172
Tax-exempt securities	3,069	2,718	9,196	8,125
Deposits in banks	104	226	600	268
Total interest income	127,575	90,303	367,268	265,905
Interest Expense
Deposits	3,193	1,083	8,274	2,778
Federal Home Loan Bank advances	966	163	2,351	979
Subordinated debentures	468	0	1,404	0
Other borrowings	152	128	288	383
Total interest expense	4,779	1,374	12,317	4,140
Net Interest Income	122,796	88,929	354,951	261,765
Provision (recapture) for loan and lease losses	3,153	(648)	12,980	5,304
Net interest income after provision (recapture) for loan and lease losses	119,643	89,577	341,971	256,461
Noninterest Income
Deposit account and treasury management fees	9,266	7,685	26,689	22,368
Card revenue	3,714	6,735	16,143	18,660
Financial services and trust revenue	2,975	2,645	8,924	8,520
Loan revenue	3,282	3,154	9,522	9,736
Merchant processing revenue	0	0	0	4,283
Bank owned life insurance	1,402	1,290	4,540	4,003
Gain (Loss) on Investments	(62)	0	(73)	0
Change in FDIC loss-sharing asset	0	0	0	(447)
Gain on sale of merchant card services portfolio	0	14,000	0	14,000
Other	442	1,558	2,109	4,938
Total noninterest income	21,019	37,067	67,854	86,061
Noninterest Expense
Compensation and employee benefits	49,419	39,983	148,938	119,201
Occupancy	8,321	8,085	27,718	22,853
Merchant processing expense	0	0	0	2,196
Advertising and promotion	1,472	969	4,523	2,923
Data processing	4,466	4,122	14,957	13,071
Legal and professional fees	4,695	2,880	12,103	9,196
Taxes, licenses and fees	1,562	1,505	4,547	3,494
Regulatory premiums	904	782	2,778	2,299
Net cost (benefit) of operation of other real estate owned	485	271	1,244	422
Amortization of intangibles	3,070	1,188	9,346	3,786
Other	8,447	7,752	27,317	25,949
Total noninterest expense	82,841	67,537	253,471	205,390
Income before income taxes	57,821	59,107	156,354	137,132
Income tax provision	11,406	18,338	28,220	40,032
Net Income	$ 46,415	$ 40,769	$ 128,134	$ 97,100
Earnings per common share
Basic ($ per share)	$ 0.63	$ 0.70	$ 1.75	$ 1.67
Diluted ($ per share)	0.63	0.70	1.75	1.67
Dividends declared per common share	$ 0.26	$ 0.22	$ 0.74	$ 0.66
Weighted average number of common shares outstanding	72,427	57,566	72,370	57,459
Weighted average number of diluted common shares outstanding	72,432	57,571	72,374	57,465

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income		$ 46,415	$ 40,769	$ 128,134	$ 97,100
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		(14,149)	549	(48,043)	8,284
Reclassification adjustment of net gain from sale of available for sale securities included in income				(81)	0
Net unrealized gain from securities, net of reclassification adjustment		(14,149)	549	(48,124)	8,284
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				0	4,604
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		61	46	183	178
Pension plan liability adjustment, net		61	46	183	4,782
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	(14,088)	595	(47,941)	13,066
Total comprehensive income		$ 32,327	$ 41,364	$ 80,193	$ 110,166
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$ 4,286	$ (312)	$ 14,554	$ (4,716)
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	0	0	25	0
Net unrealized loss from unfunded defined benefit plan liability arising during the period, tax	0	0	0	(2,622)
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	$ (19)	$ (26)	$ (56)	$ (101)

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Preferred Stock [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member]	$ 67	$ 184	$ (117)
Balance, value at Dec. 31, 2016	1,251,012	$ 995,837	271,957	$ (18,999)	$ 2,217
Balance, shares at Dec. 31, 2016		58,042			9
Net income	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
Issuance of common stock - restricted stock awards, net of cancelled awards, value	5,915	$ 5,915
Conversion of Stock, Shares Converted					(9)
Conversion of Stock, Amount Converted					$ (2,217)
Conversion of Stock, New Issuance		102
Conversion of Stock, Amount Issued	0	$ 2,217
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		238
Stock Repurchased and Retired During Period, Value	(2,246)	$ (2,246)
Stock Repurchased During Period, Shares		(55)
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			0
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	0		(157)	157
Balance, value at Dec. 31, 2017	1,949,922	$ 1,634,705	337,442	(22,225)	$ 0
Balance, shares at Dec. 31, 2017		73,020			0
Net income	128,134		128,134
Other comprehensive income	(47,941)			(47,941)
Issuance of common stock - stock option and other plans, value	1,857	$ 1,857
Issuance of common stock - stock option and other plans, shares		45
Issuance of common stock - restricted stock awards, net of cancelled awards, value	6,231	$ 6,231
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		257
Stock Repurchased and Retired During Period, Value	(2,660)	$ (2,660)
Stock Repurchased During Period, Shares		(62)
Cash dividends paid on common stock	(54,155)		(54,155)
Balance, value at Sep. 30, 2018	1,981,395	$ 1,640,140	$ 411,264	$ (70,009)	$ 0
Balance, shares at Sep. 30, 2018		73,260			0
Stock Adjustment Deferred Compensation - Shares		0
Stock Adjustment Value Deferred Compensation	$ 7	$ 7

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net income	$ 128,134	$ 97,100
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan and lease losses	12,980	5,304
Stock-based compensation expense	6,231	5,915
Depreciation, amortization and accretion	25,807	21,483
Investment securities losses, net	(73)	0
Net realized (gain) loss on sale of premises and equipment, loans held for investment and other assets	(142)	189
Net realized loss on sale and valuation adjustments of other real estate owned	(1,299)	(489)
Gain on sale of merchant card services portfolio	0	14,000
Gain on bank owned life insurance death benefit	0	2,980
FDIC loss-sharing agreement early termination, pretax charge	0	2,409
Originations of loans held for sale	103,614	99,130
Proceeds from sales of loans held for sale	104,105	97,174
Net change in:
Interest receivable	(7,595)	(6,089)
Interest payable	618	(21)
Other assets	(2,599)	(4,406)
Other liabilities	5,662	(2,624)
Net cash provided by operating activities	171,243	100,435
Cash Flows From Investing Activities
Loans originated, net of principal collected	(168,382)	(304,831)
Purchases of securities available for sale	(606,052)	(130,906)
Purchases of premises and equipment	(8,253)	(4,380)
Payments to Acquire Federal Home Loan Bank Stock	(136,120)	(92,040)
Proceeds from FDIC for reimbursement on loss-sharing asset	0	26
Proceeds from sales of securities available for sale	32,330	0
Proceeds from principal repayments and maturities of securities available for sale	311,956	200,470
Proceeds from Sales of Assets, Investing Activities	14,956	12,157
Proceeds from sale of merchant card services portfolio	0	14,000
Proceeds from Sale of Federal Home Loan Bank Stock	129,920	92,040
Proceeds from sales of other real estate and other personal property owned	5,868	1,901
Proceeds from Life Insurance Policy	5,074	10,745
Payment from (to) FDIC to terminate loss-sharing agreements	0	(4,666)
Payments to FDIC related to loss-sharing asset	0	(210)
Net cash used in investing activities	(418,703)	(205,694)
Cash Flows From Financing Activities
Net increase in deposits	72,151	282,336
Net decrease in sweep repurchase agreements	(16,862)	(39,889)
Proceeds from Federal Home Loan Bank advances	3,403,000	2,301,000
Federal Reserve Bank borrowings	5,010	10
Proceeds from exercise of stock options	1,857	1,980
Repayment of Federal Home Loan Bank advances	(3,248,000)	(2,301,000)
Repayment of Federal Reserve Bank borrowings	5,010	10
Payment of common stock dividends	(54,149)	(38,466)
Repayments of junior subordinated debt	8,248	0
Purchase and retirement of common stock	2,660	2,246
Net cash provided by financing activities	147,089	203,715
Increase (decrease) in cash and cash equivalents	(100,371)	98,456
Cash and cash equivalents at beginning of period	342,533	224,238
Cash and cash equivalents at end of period	242,162	322,694
Supplemental Information:
Cash paid for interest	11,699	4,161
Cash paid for income tax	12,768	37,701
Non-cash investing and financing activities
Loans transferred to other real estate owned	1,200	74
Premises and equipment expenditures incurred but not yet paid	464	0
Change in dividends payable on unvested shares	$ 6	$ 0

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Basis of Presentation And Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies	Basis of Presentation, Significant Accounting Policies and Reclassifications 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, 2018 are not necessarily indicative of results to be anticipated for the year ending December 31, 2018 . The accompanying interim unaudited Consolidated Financial Statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2017 Annual Report on Form 10-K. Significant Accounting Policies The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2017 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2017 Form 10-K disclosure for the year ended December 31, 2017 . Reclassifications Certain amounts reported in prior periods have been reclassified in the Consolidated Financial Statements to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

Accounting Pronouncements Recen

Accounting Pronouncements Recently Issued $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Pronouncements Recently Issued	Accounting Pronouncements Recently Issued In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract . The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments also require the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, including reasonably certain renewal periods. The amendments in ASU 2018-15 are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. The Company is assessing the impact that this guidance will have on its Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments . The amendments in this ASU provide specific guidance on several statement of cash flow classification issues to reduce diversity in practice. The amendments in ASU 2016-15 are effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. The Company has reclassified items in the Statement of Cash Flows for the nine months ended September 30, 2017 to conform with its current presentation based on its adoption of ASU 2016-15. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments . The amendments included in this ASU require an entity to reflect its current estimate of all expected credit losses for assets held at an amortized cost basis. For available for sale debt securities, credit losses will be measured in a manner similar to current GAAP, however, this ASU will require that credit losses be presented as an allowance rather than as a write-down. The amendments in ASU 2016-13 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and are required to be adopted through a modified retrospective approach, with a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the ASU is effective. Currently, the Company cannot reasonably estimate the impact that adoption of ASU 2016-13 will have on its Consolidated Financial Statements; however, the impact may be significant. That assessment is based upon the fact that, unlike the incurred loss models in existing GAAP, the current expected credit loss (“CECL”) model in ASU 2016-13 does not specify a threshold for the recognition of an impairment allowance. Rather, the Company will recognize an impairment allowance equal to its estimate of lifetime expected credit losses, adjusted for prepayments, for in-scope financial instruments as of the end of the reporting period. Accordingly, the impairment allowance measured under the CECL model could increase significantly from the impairment allowance measured under the Company’s existing incurred loss model. The Company has engaged a third-party vendor to assist in the CECL calculation and has developed an internal governance framework to oversee the CECL implementation. Other significant CECL implementation matters being addressed by the Company include selecting loss estimation methodologies, identifying, sourcing and storing data, addressing data gaps, defining a reasonable and supportable forecast period, selecting historical loss information which will be reverted to, documenting the CECL estimation process, assessing the impact to internal controls over financial reporting, capital planning and seeking process approval from audit and regulatory stakeholders. In February 2016, the FASB issued ASU 2016-02, Leases . The amendments included in this ASU create a new accounting model for both lessees and lessors. The new guidance requires lessees to recognize lease liabilities, initially measured as the present value of future lease payments, and corresponding right-of-use assets for all leases with lease terms greater than 12 months. This model differs from the current lease accounting model, which does not require such lease liabilities and corresponding right-of-use assets to be recorded for operating leases. The amendments in ASU 2016-02 must be adopted using the modified retrospective approach and will be effective for the first interim or annual period beginning after December 15, 2018. The FASB subsequently issued ASU 2018-11, which allows for an additional (optional) transition method. Early adoption is permitted. During 2017, the Company selected a third-party lease accounting application to assist in the implementation of this new guidance. Significant implementation matters to be addressed by the Company include assessing the impact to our internal controls over financial reporting and documenting the new lease accounting process. At September 30, 2018 the Company’s estimate of right-of-use assets and lease liabilities that would be recorded on its January 1, 2019 Consolidated Balance Sheet upon adoption of ASU 2016-02 was between $40.0 million and $50.0 million . This estimate may change depending on the Company’s lease activity. Additionally, the Company expects to recognize a cumulative effect adjustment upon adoption to increase the beginning balance of retained earnings as of January 1, 2019 for any remaining deferred gains on sale-leaseback transactions which occurred prior to the date of adoption. The Company had $1.0 million of deferred gains on sale-leaseback transactions as of September 30, 2018. We do not expect a material impact to our Consolidated Statement of Income as a result of this ASU. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities . The amendments in ASU 2016-01 require all equity investments to be measured at fair value with changes in the fair value recognized through net income. The amendments in ASU 2016-01 also require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. In addition, the amendments in this update eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet for public business entities. The amendments in ASU 2016-01 are effective for the first interim or annual period beginning after December 15, 2017. The Company adopted the amendments of ASU 2016-01 effective January 1, 2018 and recorded a cumulative effect adjustment of $157 thousand to retained earnings related to the unrealized holding losses on equity securities with readily determinable fair value included in accumulated other comprehensive loss. The Company also added a separate line item on the Consolidated Balance Sheet for equity securities at fair value and reclassified amounts previously included in securities available for sale at fair value to conform to current period presentation. In addition, as required by the ASU, the fair value disclosure for loans is computed using an exit price notion and deposits with no stated maturity are no longer included in the fair value disclosures in Note 15, “Fair Value Accounting and Measurement.” In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers , which provides revenue recognition guidance that is intended to create greater consistency with respect to how and when revenue from contracts with customers is shown in the income statement. The guidance requires that revenue from contracts with customers be recognized when transfer of control over goods or services is passed to customers in the amount of consideration expected to be received. Subsequent Accounting Standard Updates have been issued clarifying the original pronouncement (ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20). The majority of the Company’s revenue is comprised of interest income from financial assets, which is specifically outside the scope of ASU 2014-09. On January 1, 2018, we adopted the accounting guidance in ASU 2014-09 and all the related amendments (“Topic 606”) using the modified retrospective method for all contracts that have not been completed (i.e. open contracts). Therefore, the comparative information has not been adjusted and continues to be reported under Topic 605. There was no cumulative effect adjustment as of January 1, 2018, and there were no material changes to the timing or amount of revenue recognized for the nine months ended September 30, 2018; however, additional disclosures were incorporated in the footnotes upon adoption. See Note 17, “Revenue from Contracts with Customers,” for more information.
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 40
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 50

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2018
Business Acquisition [Line Items]
Business Combination Disclosure [Text Block]	Business Combinations On November 1, 2017 , the Company completed its acquisition of Pacific Continental Corporation (“Pacific Continental”) and its wholly-owned banking subsidiary Pacific Continental Bank. The Company acquired 100% of the equity interests of Pacific Continental. The primary reasons for the acquisition were to expand in the Eugene, Oregon market and improve branch network efficiencies in the Seattle and Portland markets. The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting. The assets and liabilities, both tangible and intangible, were recorded at their fair values as of the November 1, 2017 acquisition date. The application of the acquisition method of accounting resulted in the recognition of goodwill of $383.1 million and a core deposit intangible of $46.9 million , or 2.34% of core deposits. The goodwill represents the excess of the purchase price over the fair value of the net assets acquired. The goodwill is not deductible for income tax purposes. The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed: November 1, 2017 (in thousands) Merger consideration $ 637,103 Identifiable net assets acquired, at fair value Assets acquired Cash and cash equivalents $ 81,190 Investment securities 449,291 Federal Home Loan Bank stock 7,084 Loans 1,873,987 Interest receivable 7,827 Premises and equipment 27,343 Other real estate owned 10,279 Core deposit intangible 46,875 Other assets 50,638 Total assets acquired 2,554,514 Liabilities assumed Deposits (2,118,982 ) Federal Home Loan Bank advances (101,127 ) Subordinated debentures (35,678 ) Junior subordinated debentures (14,434 ) Securities sold under agreements to repurchase (1,617 ) Other liabilities (28,653 ) Total liabilities assumed (2,300,491 ) Total fair value of identifiable net assets 254,023 Goodwill $ 383,080 See Note 8, “Goodwill and Other Intangible Assets,” for further discussion of the accounting for goodwill and other intangible assets. The operating results of the Company reported herein include the operating results produced by the acquired assets and assumed liabilities for the period January 1, 2018 to September 30, 2018 . Disclosure of the amount of Pacific Continental’s revenue and net income (excluding integration costs) included in Columbia’s Consolidated Statements of Income is impracticable due to the integration of the operations and accounting for this acquisition. For illustrative purposes only, the following table presents certain unaudited pro forma information for the nine months ended September 30, 2017 . This unaudited, estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented. Unaudited Pro Forma Nine Months Ended September 30, 2017 (in thousands except per share) Total revenues (net interest income plus noninterest income) $ 432,060 Net income $ 122,410 Earnings per share - basic $ 1.70 Earnings per share - diluted $ 1.70 The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Noninterest Expense Compensation and employee benefits $ 923 $ 3 $ 3,410 $ 3 Occupancy 29 593 1,619 945 Advertising and promotion — 184 534 201 Data processing 20 66 941 539 Legal and professional fees 102 157 893 1,587 Taxes, licenses and fees — — — 3 Other 7 168 771 280 Total impact of acquisition-related costs to noninterest expense $ 1,081 $ 1,171 $ 8,168 $ 3,558

Securities

Securities	9 Months Ended
	Sep. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Securities	Securities The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale: Amortized Gross Gross Fair Value September 30, 2018 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,997,736 $ 295 $ (69,199 ) $ 1,928,832 State and municipal securities 578,132 1,927 (12,241 ) 567,818 U.S. government agency and government-sponsored enterprise securities 433,267 37 (9,087 ) 424,217 U.S. government securities 251 — (4 ) 247 Total $ 3,009,386 $ 2,259 $ (90,531 ) $ 2,921,114 December 31, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,752,236 $ 1,815 $ (27,326 ) $ 1,726,725 State and municipal securities 593,940 6,023 (3,959 ) 596,004 U.S. government agency and government-sponsored enterprise securities 416,894 642 (2,762 ) 414,774 U.S. government securities 251 — (3 ) 248 Total $ 2,763,321 $ 8,480 $ (34,050 ) $ 2,737,751 The following table provides the proceeds and both gross realized gains and losses on sales of debt securities available for sale as well as other securities gains and losses for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 (in thousands) Proceeds from sales of debt securities available for sale $ — $ — $ 32,330 $ — Gross realized gains from sales of debt securities available for sale $ — $ — $ 235 $ — Gross realized losses from sales of debt securities available for sale — — (129 ) — Other securities losses, net (1) (62 ) — (179 ) — Investment securities losses, net $ (62 ) $ — $ (73 ) $ — __________ (1) Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented. The scheduled contractual maturities of debt securities available for sale at September 30, 2018 are presented as follows: September 30, 2018 Amortized Cost Fair Value (in thousands) Due within one year $ 126,071 $ 126,253 Due after one year through five years 612,279 598,770 Due after five years through ten years 1,144,161 1,113,290 Due after ten years 1,126,875 1,082,801 Total debt securities available for sale $ 3,009,386 $ 2,921,114 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, 2018 (in thousands) Washington and Oregon State to secure public deposits $ 256,078 Federal Reserve Bank to secure borrowings 51,843 Other securities pledged 119,981 Total securities pledged as collateral $ 427,902 The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2018 and December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized September 30, 2018 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,084,529 $ (26,966 ) $ 834,985 $ (42,233 ) $ 1,919,514 $ (69,199 ) State and municipal securities 333,523 (6,833 ) 96,018 (5,408 ) 429,541 (12,241 ) U.S. government agency and government-sponsored enterprise securities 300,519 (6,269 ) 120,102 (2,818 ) 420,621 (9,087 ) U.S. government securities — — 247 (4 ) 247 (4 ) Total $ 1,718,571 $ (40,068 ) $ 1,051,352 $ (50,463 ) $ 2,769,923 $ (90,531 ) December 31, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 816,678 $ (6,710 ) $ 717,211 $ (20,616 ) $ 1,533,889 $ (27,326 ) State and municipal securities 220,019 (1,723 ) 75,172 (2,236 ) 295,191 (3,959 ) U.S. government agency and government-sponsored enterprise securities 184,046 (1,006 ) 155,983 (1,756 ) 340,029 (2,762 ) U.S. government securities 249 (3 ) — — 249 (3 ) Total $ 1,220,992 $ (9,442 ) $ 948,366 $ (24,608 ) $ 2,169,358 $ (34,050 ) At September 30, 2018 , there were 481 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 153 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, 2018 . At September 30, 2018 , there were 458 state and municipal government securities in an unrealized loss position, of which 92 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, 2018 , none of the rated obligations of state and local government entities held by the Company had a below investment grade credit rating. Because the credit quality of these securities are investment grade and the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2018 . At September 30, 2018 , there were 54 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, of which 14 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, 2018 . At September 30, 2018 , there was one U.S. government security in an unrealized loss position, which was also 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, 2018 .

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Loans Receivable, Net [Abstract]
Loans	Loans The Company’s loan portfolio includes originated and purchased loans. Originated loans and purchased loans for which there was no evidence of credit deterioration at their acquisition date and it was probable that we would be able to collect all contractually required payments are referred to collectively as loans, excluding purchased credit impaired loans. Purchased loans for which there was, at acquisition date, evidence of credit deterioration since their origination and it was probable that we would be unable to collect all contractually required payments are referred to as purchased credit impaired loans, or “PCI loans.” The following is an analysis of the loan portfolio by segment (net of unearned income): September 30, 2018 December 31, 2017 Loans, excluding PCI loans PCI Loans Total Loans, excluding PCI loans PCI Loans Total (in thousands) Commercial business $ 3,554,147 $ 11,164 $ 3,565,311 $ 3,377,324 $ 12,628 $ 3,389,952 Real estate: One-to-four family residential 232,924 8,356 241,280 188,396 12,395 200,791 Commercial and multifamily residential 3,786,615 66,748 3,853,363 3,825,739 75,594 3,901,333 Total real estate 4,019,539 75,104 4,094,643 4,014,135 87,989 4,102,124 Real estate construction: One-to-four family residential 211,629 159 211,788 200,518 177 200,695 Commercial and multifamily residential 349,328 579 349,907 371,931 607 372,538 Total real estate construction 560,957 738 561,695 572,449 784 573,233 Consumer 327,863 8,930 336,793 334,190 11,269 345,459 Less: Net unearned income (44,125 ) — (44,125 ) (52,111 ) — (52,111 ) Total loans, net of unearned income 8,418,381 95,936 8,514,317 8,245,987 112,670 8,358,657 Less: Allowance for loan and lease losses (79,770 ) (4,017 ) (83,787 ) (68,739 ) (6,907 ) (75,646 ) Total loans, net $ 8,338,611 $ 91,919 $ 8,430,530 $ 8,177,248 $ 105,763 $ 8,283,011 Loans held for sale $ 5,275 $ — $ 5,275 $ 5,766 $ — $ 5,766 At September 30, 2018 and December 31, 2017 , the Company had no material foreign activities. Substantially all of the Company’s loans and unfunded commitments are geographically concentrated in its service areas within the states of Washington, Oregon and Idaho. The Company has made loans to executive officers and directors of the Company and related interests. These loans are made on the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons and do not involve more than the normal risk of collectability. The aggregate dollar amount of these loans was $9.7 million and $10.0 million at September 30, 2018 and December 31, 2017 , respectively. During the first nine months of 2018 , there were $14 thousand in advances and $226 thousand in repayments. At September 30, 2018 and December 31, 2017 , $3.18 billion and $2.25 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank of Des Moines (“FHLB”) borrowings and additional borrowing capacity. The Company has also pledged $76.2 million and $70.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at September 30, 2018 and December 31, 2017 , respectively. The following is an analysis of nonaccrual loans as of September 30, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 Recorded Unpaid Principal Recorded Unpaid Principal (in thousands) Commercial business: Secured $ 45,753 $ 57,049 $ 45,410 $ 56,865 Unsecured — — 50 49 Real estate: One-to-four family residential 501 508 785 1,182 Commercial & multifamily residential: Commercial land 2,461 2,470 2,628 2,623 Income property 1,873 2,523 4,284 5,410 Owner occupied 6,678 6,992 7,029 7,270 Real estate construction: One-to-four family residential: Land and acquisition 318 318 25 26 Residential construction — — 1,829 1,828 Consumer 2,748 2,937 4,149 4,633 Total $ 60,332 $ 72,797 $ 66,189 $ 79,886 Loans, excluding purchased credit impaired loans The following is an aging of the recorded investment of the loan portfolio as of September 30, 2018 and December 31, 2017 : Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans September 30, 2018 (in thousands) Commercial business: Secured $ 3,365,159 $ 7,141 $ 2,258 $ — $ 9,399 $ 45,753 $ 3,420,311 Unsecured 117,801 1,118 — — 1,118 — 118,919 Real estate: One-to-four family residential 229,685 341 784 — 1,125 501 231,311 Commercial & multifamily residential: Commercial land 278,777 — — — — 2,461 281,238 Income property 1,880,405 3,339 2,073 — 5,412 1,873 1,887,690 Owner occupied 1,588,662 1,929 — — 1,929 6,678 1,597,269 Real estate construction: One-to-four family residential: Land and acquisition 5,320 325 — — 325 318 5,963 Residential construction 200,484 4,144 — — 4,144 — 204,628 Commercial & multifamily residential: Income property 253,470 — 166 — 166 — 253,636 Owner occupied 90,511 — — — — — 90,511 Consumer 322,085 1,788 284 — 2,072 2,748 326,905 Total $ 8,332,359 $ 20,125 $ 5,565 $ — $ 25,690 $ 60,332 $ 8,418,381 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2017 (in thousands) Commercial business: Secured $ 3,185,321 $ 2,530 $ 2,400 $ — $ 4,930 $ 45,410 $ 3,235,661 Unsecured 123,524 100 501 — 601 50 124,175 Real estate: One-to-four family residential 184,256 1,111 402 — 1,513 785 186,554 Commercial & multifamily residential: Commercial land 292,680 92 — 581 673 2,628 295,981 Income property 1,898,655 2,426 971 — 3,397 4,284 1,906,336 Owner occupied 1,590,004 2,485 468 — 2,953 7,029 1,599,986 Real estate construction: One-to-four family residential: Land and acquisition 9,882 — — — — 25 9,907 Residential construction 187,862 — — — — 1,829 189,691 Commercial & multifamily residential: Income property 293,028 — — — — — 293,028 Owner occupied 72,443 — — — — — 72,443 Consumer 325,928 1,446 702 — 2,148 4,149 332,225 Total $ 8,163,583 $ 10,190 $ 5,444 $ 581 $ 16,215 $ 66,189 $ 8,245,987 The following is an analysis of impaired loans as of September 30, 2018 and December 31, 2017 : Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid September 30, 2018 (in thousands) Commercial business: Secured $ 3,379,535 $ 40,776 $ 7,402 $ 7,875 $ 1,139 $ 33,374 $ 38,293 Unsecured 118,897 22 — — — 22 21 Real estate: One-to-four family residential 230,915 396 337 606 8 59 256 Commercial & multifamily residential: Commercial land 279,008 2,230 — — — 2,230 2,274 Income property 1,884,936 2,754 110 175 1 2,644 2,789 Owner occupied 1,587,550 9,719 3,274 4,693 71 6,445 6,692 Real estate construction: One-to-four family residential: Land and acquisition 5,963 — — — — — — Residential construction 204,628 — — — — — — Commercial & multifamily residential: Income property 253,636 — — — — — — Owner occupied 86,461 4,050 — — — 4,050 4,050 Consumer 322,162 4,743 3,702 3,953 36 1,041 1,056 Total $ 8,353,691 $ 64,690 $ 14,825 $ 17,302 $ 1,255 $ 49,865 $ 55,431 Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid December 31, 2017 (in thousands) Commercial business: Secured $ 3,195,649 $ 40,012 $ 3,808 $ 3,937 $ 1,867 $ 36,204 $ 42,314 Unsecured 124,150 25 25 24 3 — — Real estate: One-to-four family residential 185,659 895 867 1,408 103 28 337 Commercial & multifamily residential: Commercial land 293,694 2,287 — — — 2,287 2,282 Income property 1,901,313 5,023 2,768 3,328 185 2,255 2,601 Owner occupied 1,591,298 8,688 77 80 3 8,611 10,077 Real estate construction: One-to-four family residential: Land and acquisition 9,907 — — — — — — Residential construction 188,481 1,210 — — — 1,210 1,210 Commercial & multifamily residential: Income property 293,028 — — — — — — Owner occupied 68,393 4,050 — — — 4,050 4,050 Consumer 325,210 7,015 5,303 5,568 199 1,712 1,864 Total $ 8,176,782 $ 69,205 $ 12,848 $ 14,345 $ 2,360 $ 56,357 $ 64,735 The following table provides additional information on impaired loans for the three and nine month periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized (in thousands) Commercial business: Secured $ 43,805 $ 2 $ 22,395 $ 2 $ 43,055 $ 43 $ 15,349 $ 25 Unsecured 444 — — — 234 1 — — Real estate: One-to-four family residential 545 12 856 15 713 30 688 37 Commercial & multifamily residential: Commercial land 2,246 26 2,549 — 2,407 26 2,026 — Income property 2,443 34 4,214 21 3,367 96 4,137 27 Owner occupied 9,349 124 4,530 127 8,986 333 4,496 319 Real estate construction: One-to-four family residential: Land and acquisition — — — — — — 4 — Residential construction — — — — 605 — 84 — Commercial & multifamily residential: Owner occupied 4,050 72 2,025 151 4,050 174 1,012 151 Consumer 5,646 44 6,054 58 6,135 110 5,712 105 Total $ 68,528 $ 314 $ 42,623 $ 374 $ 69,552 $ 813 $ 33,508 $ 664 The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and nine months ended September 30, 2018 and 2017 : Three months ended September 30, 2018 Three months ended September 30, 2017 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 1 $ 14,511 $ 14,511 2 $ 808 $ 808 Real estate: One-to-four family residential — — — 2 201 201 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 3 123 123 17 1,672 1,672 Total 4 $ 14,634 $ 14,634 24 $ 7,961 $ 7,961 Nine months ended September 30, 2018 Nine months ended September 30, 2017 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 9 $ 17,605 $ 17,605 7 $ 2,586 $ 2,586 Real estate: One-to-four family residential — — — 3 583 583 Commercial and multifamily residential: Income property 1 891 891 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 18 2,540 2,540 35 4,033 4,033 Total 28 $ 21,036 $ 21,036 48 $ 12,482 $ 12,482 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 $16.2 million of additional funds on loans classified as TDR as of September 30, 2018 . The Company had $506 thousand of such commitments at December 31, 2017 . The Company did not have any loans modified as TDR that defaulted within 12 months of being modified as TDR during the three and nine months ended September 30, 2018 and 2017 . Purchased Credit Impaired Loans Purchased credit impaired (“PCI”) loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis. Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows. Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix, which utilizes probability values of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages, and recovery lags are based upon the collateral within the loan pools. The excess of cash flows expected to be collected over the initial fair value of purchased credit impaired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates. The following is an analysis of our PCI loans, net of related allowance for losses and remaining valuation discounts as of September 30, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 (in thousands) Commercial business $ 11,603 $ 13,753 Real estate: One-to-four family residential 10,243 14,610 Commercial and multifamily residential 70,344 79,211 Total real estate 80,587 93,821 Real estate construction: One-to-four family residential 159 177 Commercial and multifamily residential 552 595 Total real estate construction 711 772 Consumer 9,880 12,412 Subtotal of PCI loans 102,781 120,758 Less: Valuation discount resulting from acquisition accounting 6,845 8,088 Allowance for loan losses 4,017 6,907 PCI loans, net of allowance for loan losses $ 91,919 $ 105,763 The following table shows the changes in accretable yield for PCI loans for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 25,350 $ 35,706 $ 31,176 $ 45,191 Accretion (2,233 ) (2,766 ) (6,435 ) (9,830 ) Disposals (221 ) — (387 ) (158 ) Reclassifications from (to) nonaccretable difference 279 (892 ) (1,179 ) (3,155 ) Balance at end of period $ 23,175 $ 32,048 $ 23,175 $ 32,048

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit	9 Months Ended
	Sep. 30, 2018
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit Text Block	Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit We record an allowance for loan and lease losses (the “allowance”) to recognize management’s estimate of credit losses incurred in the loan portfolio at each balance sheet date. We have used the same methodology for allowance calculations during the nine months ended September 30, 2018 and 2017 . The following tables show a detailed analysis of the allowance for the three and nine months ended September 30, 2018 and 2017 : Beginning Charge-offs Recoveries Provision (Recapture) Ending Specific General Three months ended September 30, 2018 (in thousands) Commercial business: Secured $ 40,350 $ (576 ) $ 496 $ 2,912 $ 43,182 $ 1,139 $ 42,043 Unsecured 2,443 (30 ) 51 (41 ) 2,423 — 2,423 Real estate: One-to-four family residential 461 — 21 (110 ) 372 8 364 Commercial & multifamily residential: Commercial land 3,278 — 8 (87 ) 3,199 — 3,199 Income property 4,102 — 202 (292 ) 4,012 1 4,011 Owner occupied 4,356 — 3 316 4,675 71 4,604 Real estate construction: One-to-four family residential: Land and acquisition 848 — 582 (742 ) 688 — 688 Residential construction 4,572 — 1 660 5,233 — 5,233 Commercial & multifamily residential: Income property 7,367 — — 573 7,940 — 7,940 Owner occupied 2,299 — — 138 2,437 — 2,437 Consumer 5,292 (277 ) 266 (258 ) 5,023 36 4,987 Purchased credit impaired 4,782 (1,208 ) 945 (502 ) 4,017 — 4,017 Unallocated — — — 586 586 — 586 Total $ 80,150 $ (2,091 ) $ 2,575 $ 3,153 $ 83,787 $ 1,255 $ 82,532 Beginning Charge-offs Recoveries Provision (Recapture) Ending Specific General Nine months ended September 30, 2018 (in thousands) Commercial business: Secured $ 29,341 $ (8,741 ) $ 2,536 $ 20,046 $ 43,182 $ 1,139 $ 42,043 Unsecured 2,000 (117 ) 356 184 2,423 — 2,423 Real estate: One-to-four family residential 701 — 389 (718 ) 372 8 364 Commercial & multifamily residential: Commercial land 4,265 — 92 (1,158 ) 3,199 — 3,199 Income property 5,672 (223 ) 901 (2,338 ) 4,012 1 4,011 Owner occupied 5,459 — 19 (803 ) 4,675 71 4,604 Real estate construction: One-to-four family residential: Land and acquisition 963 — 610 (885 ) 688 — 688 Residential construction 3,709 — 6 1,518 5,233 — 5,233 Commercial & multifamily residential: Income property 7,053 — — 887 7,940 — 7,940 Owner occupied 4,413 — — (1,976 ) 2,437 — 2,437 Consumer 5,163 (773 ) 796 (163 ) 5,023 36 4,987 Purchased credit impaired 6,907 (3,786 ) 3,096 (2,200 ) 4,017 — 4,017 Unallocated — — — 586 586 — 586 Total $ 75,646 $ (13,640 ) $ 8,801 $ 12,980 $ 83,787 $ 1,255 $ 82,532 Beginning Charge-offs Recoveries Provision (Recapture) 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 (Recapture) 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 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, 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 3,680 $ 3,555 $ 3,130 $ 2,705 Net changes in the allowance for unfunded commitments and letters of credit 275 (75 ) 825 775 Balance at end of period $ 3,955 $ 3,480 $ 3,955 $ 3,480 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 reviewed 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, 2018 and December 31, 2017 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2018 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 3,202,147 $ 83,986 $ 134,178 $ — $ — $ 3,420,311 Unsecured 118,885 33 1 — — 118,919 Real estate: One-to-four family residential 229,704 — 1,607 — — 231,311 Commercial and multifamily residential: Commercial land 272,838 3,423 4,977 — — 281,238 Income property 1,857,338 19,474 10,878 — — 1,887,690 Owner occupied 1,532,093 27,182 37,994 — — 1,597,269 Real estate construction: One-to-four family residential: Land and acquisition 5,645 — 318 — — 5,963 Residential construction 204,628 — — — — 204,628 Commercial and multifamily residential: Income property 253,636 — — — — 253,636 Owner occupied 86,461 — 4,050 — — 90,511 Consumer 322,595 — 4,310 — — 326,905 Total $ 8,085,970 $ 134,098 $ 198,313 $ — $ — 8,418,381 Less: Allowance for loan and lease losses 79,770 Loans, excluding PCI loans, net $ 8,338,611 Pass Special Mention Substandard Doubtful Loss Total December 31, 2017 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 3,049,031 $ 64,600 $ 122,030 $ — $ — $ 3,235,661 Unsecured 123,621 — 554 — — 124,175 Real estate: One-to-four family residential 183,312 1,186 2,056 — — 186,554 Commercial and multifamily residential: Commercial land 283,673 5,204 7,104 — — 295,981 Income property 1,857,832 17,181 31,323 — — 1,906,336 Owner occupied 1,546,775 7,380 45,831 — — 1,599,986 Real estate construction: One-to-four family residential: Land and acquisition 9,882 — 25 — — 9,907 Residential construction 187,863 — 1,828 — — 189,691 Commercial and multifamily residential: Income property 293,028 — — — — 293,028 Owner occupied 68,393 — 4,050 — — 72,443 Consumer 323,129 — 9,096 — — 332,225 Total $ 7,926,539 $ 95,551 $ 223,897 $ — $ — 8,245,987 Less: Allowance for loan and lease losses 68,739 Loans, excluding PCI loans, net $ 8,177,248 The following is an analysis of the credit quality of our PCI loan portfolio as of September 30, 2018 and December 31, 2017 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2018 (in thousands) PCI loans: Commercial business: Secured $ 9,732 $ — $ 947 $ — $ — $ 10,679 Unsecured 824 — 100 — — 924 Real estate: One-to-four family residential 10,021 — 222 — — 10,243 Commercial and multifamily residential: Commercial land 10,583 — — — — 10,583 Income property 20,444 — 1,898 — — 22,342 Owner occupied 37,042 — 377 — — 37,419 Real estate construction: One-to-four family residential: Land and acquisition 155 — 4 — — 159 Residential construction — — — — — — Commercial and multifamily residential: Income property 552 — — — — 552 Owner occupied — — — — — — Consumer 9,638 — 242 — — 9,880 Total $ 98,991 $ — $ 3,790 $ — $ — 102,781 Less: Valuation discount resulting from acquisition accounting 6,845 Allowance for loan losses 4,017 PCI loans, net $ 91,919 Pass Special Mention Substandard Doubtful Loss Total December 31, 2017 (in thousands) PCI loans: Commercial business: Secured $ 11,918 $ — $ 723 $ — $ — $ 12,641 Unsecured 1,045 — 67 — — 1,112 Real estate: One-to-four family residential 13,817 — 793 — — 14,610 Commercial and multifamily residential: Commercial land 9,460 349 — — — 9,809 Income property 25,981 — 35 — — 26,016 Owner occupied 42,617 — 769 — — 43,386 Real estate construction: One-to-four family residential: Land and acquisition 169 — 8 — — 177 Residential construction — — — — — — Commercial and multifamily residential: Income property 595 — — — — 595 Owner occupied — — — — — — Consumer 11,705 — 707 — — 12,412 Total $ 117,307 $ 349 $ 3,102 $ — $ — 120,758 Less: Valuation discount resulting from acquisition accounting 8,088 Allowance for loan losses 6,907 PCI loans, net $ 105,763

Other Real Estate Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2018
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Real Estate Owned	Other Real Estate Owned (“OREO”) The following tables set forth activity in OREO for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Balance, beginning of period $ 7,080 $ 4,058 $ 13,298 $ 5,998 Transfers in 794 74 1,200 74 Valuation adjustments (495 ) (138 ) (697 ) (364 ) Proceeds from sale of OREO property (47 ) (182 ) (5,868 ) (1,901 ) Loss on sale of OREO, net (1 ) (130 ) (602 ) (125 ) Balance, end of period $ 7,331 $ 3,682 $ 7,331 $ 3,682 At September 30, 2018 , there were $60 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 $736 thousand .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Other Intangible Assets In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an annual impairment assessment as of July 31, 2018 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, 2018 2017 2018 2017 (in thousands) Goodwill Total goodwill (1) $ 765,842 $ 382,762 $ 765,842 $ 382,762 Other intangible assets, net Core deposit intangible: Gross core deposit intangible balance at beginning of period 105,473 58,598 105,473 58,598 Accumulated amortization at beginning of period (54,495 ) (44,484 ) (48,219 ) (41,886 ) Core deposit intangible, net at beginning of period 50,978 14,114 57,254 16,712 CDI current period amortization (3,070 ) (1,188 ) (9,346 ) (3,786 ) Total core deposit intangible, net at end of period 47,908 12,926 47,908 12,926 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 48,827 13,845 48,827 13,845 Total goodwill and other intangible assets at end of period $ 814,669 $ 396,607 $ 814,669 $ 396,607 __________ (1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017. The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2018 and the succeeding four years: Amount (in thousands) Year ending December 31, 2018 $ 2,890 2019 10,479 2020 8,724 2021 7,264 2022 5,880

Subordinated debentures

Subordinated debentures	9 Months Ended
	Sep. 30, 2018
Subordinated Borrowing [Line Items]
Subordinated Borrowings Disclosure [Text Block]	Subordinated Debentures On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $35.0 million in aggregate principal amount of fixed-to-floating rate subordinated debentures (the “Notes”). The Notes are callable at par on June 30, 2021, have a stated maturity of June 30, 2026 and bear interest at a fixed annual rate of 5.875% per year, from and including June 27, 2016, but excluding June 30, 2021. From and including June 30, 2021 through the maturity date or early redemption date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR plus 471.5 basis points.

Junior subordinated debt

Junior subordinated debt	9 Months Ended
	Sep. 30, 2018
Junior subordinated debt [Abstract]
Junior subordinated debentures [Text Block]	Junior Subordinated Debentures On November 1, 2017, with its acquisition of Pacific Continental, the Company assumed $14.4 million of trust preferred obligations. The Company redeemed $6.2 million of these obligations during 2017. The remaining $8.2 million of obligations were redeemed in January 2018.

Derivatives and Balance Sheet O

Derivatives and Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2018
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivatives and Hedging Activities	Derivatives and Balance Sheet Offsetting The Company periodically enters into certain commercial loan interest rate swap agreements in order to provide commercial loan customers the ability to convert from variable to fixed interest rates. Under these agreements, the Company enters into a variable-rate loan agreement with a customer in addition to a swap agreement. This swap agreement effectively converts the customer’s variable rate loan into a fixed rate. The Company then enters into a corresponding swap agreement with a third-party in order to offset its exposure on the variable and fixed components of the customer agreement. As the interest rate swap agreements with the customers and third parties are not designated as hedges under the Derivatives and Hedging topic of the FASB ASC, the instruments are marked to market in earnings. The notional amount of open interest rate swap agreements at September 30, 2018 and December 31, 2017 was $368.1 million and $384.7 million , respectively. During the three and nine months ended September 30, 2018 , mark-to-market gain s of $1 thousand and $9 thousand , respectively, were recorded to “Other” noninterest expense. During the three and nine months ended September 30, 2017 , mark-to-market gain s of $6 thousand and $12 thousand , respectively, were recorded to “Other” noninterest expense. The following table presents the fair value of derivatives not designated as hedging instruments at September 30, 2018 and December 31, 2017 : Asset Derivatives Liability Derivatives September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Interest rate contracts Other assets $ 10,479 Other assets $ 6,707 Other liabilities $ 10,478 Other liabilities $ 6,714 The Company is party to interest rate contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or 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, 2018 (in thousands) Assets Interest rate contracts $ 10,479 $ — $ 10,479 $ — $ 10,479 Liabilities Interest rate contracts $ 10,478 $ — $ 10,478 $ (9,595 ) $ 883 Repurchase agreements $ 62,197 $ — $ 62,197 $ (62,197 ) $ — December 31, 2017 Assets Interest rate contracts $ 6,707 $ — $ 6,707 $ — $ 6,707 Liabilities Interest rate contracts $ 6,714 $ — $ 6,714 $ (6,714 ) $ — Repurchase agreements $ 79,059 $ — $ 79,059 $ (79,059 ) $ — The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements: Remaining contractual maturity of the agreements Overnight and continuous Up to 30 days 30 - 90 days Greater than 90 days Total September 30, 2018 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 62,197 $ — $ — $ — $ 62,197 Gross amount of recognized liabilities for repurchase agreements 62,197 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 $62.2 million sweep repurchase agreements, which mature on an overnight basis, is monitored on a daily basis as the underlying sweep accounts can have frequent transaction activity and the amount of pledged collateral is adjusted as necessary.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingent Liabilities Lease Commitments: The Company’s lease commitments consist primarily of leased locations under various non-cancellable operating leases that expire between 2018 and 2043 . The majority of the leases contain renewal options and provisions for increases in rental rates based on an agreed upon index or predetermined escalation schedule. Financial Instruments with Off-Balance Sheet Risk: In the normal course of business, the Company makes loan commitments (typically unfunded loans and unused lines of credit) and issues standby letters of credit to accommodate the financial needs of its customers. At September 30, 2018 and December 31, 2017 , the Company’s loan commitments amounted to $2.50 billion and $2.62 billion , respectively. Standby letters of credit commit the Company to make payments on behalf of customers under specified conditions. Historically, no significant losses have been incurred by the Company under standby letters of credit. Both arrangements have credit risk essentially the same as that involved in extending loans to customers and are subject to the Company’s normal credit policies, including collateral requirements, where appropriate. Standby letters of credit were $41.8 million and $51.3 million at September 30, 2018 and December 31, 2017 , respectively. In addition, commitments under commercial letters of credit used to facilitate customers’ trade transactions and other off-balance sheet liabilities amounted to $104 thousand and $159 thousand at September 30, 2018 and December 31, 2017 , respectively. Legal Proceedings: The Company and its subsidiaries are from time to time defendants in and are threatened with various legal proceedings arising from their regular business activities. Management, after consulting with legal counsel, is of the opinion that the ultimate liability, if any, resulting from these pending or threatened actions and proceedings will not have a material effect on the financial statements of the Company.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Dividends: On January 25, 2018 , the Company declared a regular quarterly cash dividend of $0.22 per common share payable on February 21, 2018 to shareholders of record at the close of business on February 7, 2018 . On April 25, 2018 , the Company declared a regular quarterly cash dividend of $0.26 per common share payable on May 23, 2018 to shareholders of record at the close of business on May 9, 2018 . On July 25, 2018 , the Company declared a regular quarterly cash dividend of $0.26 per common share payable on August 22, 2018 to shareholders of record at the close of business on August 8, 2018 . Subsequent to quarter end, on October 25, 2018 , the Company declared a regular quarterly cash dividend of $0.26 per common share and a special cash dividend of $0.14 per common share payable on November 21, 2018 to shareholders of record at the close of business on November 7, 2018 . The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Loss The following table shows changes in accumulated other comprehensive income (loss) by component for the three and nine month periods ended September 30, 2018 and 2017 : Unrealized Gains and Losses on Available-for-Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Total (1) Three months ended September 30, 2018 (in thousands) Beginning balance $ (53,597 ) $ (2,324 ) $ (55,921 ) Other comprehensive loss before reclassifications (14,149 ) — (14,149 ) Amounts reclassified from accumulated other comprehensive loss — 61 61 Net current-period other comprehensive income (loss) (14,149 ) 61 (14,088 ) Ending balance $ (67,746 ) $ (2,263 ) $ (70,009 ) Three months ended September 30, 2017 Beginning balance $ (4,969 ) $ (1,559 ) $ (6,528 ) Other comprehensive income before reclassifications 549 — 549 Amounts reclassified from accumulated other comprehensive loss — 46 46 Net current-period other comprehensive income 549 46 595 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Nine months ended September 30, 2018 Beginning balance $ (19,779 ) $ (2,446 ) $ (22,225 ) Adjustment pursuant to adoption of ASU 2016-01 157 — 157 Other comprehensive loss before reclassifications (48,043 ) — (48,043 ) Amounts reclassified from accumulated other comprehensive loss (81 ) 183 102 Net current-period other comprehensive income (loss) (48,124 ) 183 (47,941 ) Ending balance $ (67,746 ) $ (2,263 ) $ (70,009 ) 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 loss — 178 178 Net current-period other comprehensive income 8,284 4,782 13,066 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) __________ (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, 2018 and 2017 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, Affected line Item in the Consolidated 2018 2017 2018 2017 Statement of Income (in thousands) Unrealized gains and losses on available-for-sale debt securities Investment securities gains, net $ — $ — $ 106 $ — Investment securities losses, net — — 106 — Total before tax — — (25 ) — Income tax provision $ — $ — $ 81 $ — Net of tax Amortization of pension plan liability Actuarial losses $ (80 ) $ (72 ) $ (239 ) $ (279 ) Compensation and employee benefits (80 ) (72 ) (239 ) (279 ) Total before tax 19 26 56 101 Income tax benefit $ (61 ) $ (46 ) $ (183 ) $ (178 ) Net of tax

Fair Value Accounting and Measu

Fair Value Accounting and Measurement	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Accounting and Measurement	Fair Value Accounting and Measurement The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available. The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy: Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date. Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable. Fair values are determined as follows: Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury Notes and equity securities, which are considered a Level 1 input method. Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy. The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at September 30, 2018 and December 31, 2017 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 September 30, 2018 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,928,832 $ — $ 1,928,832 $ — State and municipal debt securities 567,818 — 567,818 — U.S. government agency and government-sponsored enterprise securities 424,217 — 424,217 — U.S. government securities 247 247 — — Total debt securities available for sale $ 2,921,114 $ 247 $ 2,920,867 $ — Equity securities $ 4,901 $ 4,901 $ — $ — Other assets (Interest rate contracts) $ 10,479 $ — $ 10,479 $ — Liabilities Other liabilities (Interest rate contracts) $ 10,478 $ — $ 10,478 $ — Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2017 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,726,725 $ — $ 1,726,725 $ — State and municipal debt securities 596,004 — 596,004 — U.S. government agency and government-sponsored enterprise securities 414,774 — 414,774 — U.S. government securities 248 248 — — Total debt securities available for sale $ 2,737,751 $ 248 $ 2,737,503 $ — Equity securities $ 5,080 $ 5,080 $ — $ — Other assets (Interest rate contracts) $ 6,707 $ — $ 6,707 $ — Liabilities Other liabilities (Interest rate contracts) $ 6,714 $ — $ 6,714 $ — There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the nine month periods ended September 30, 2018 and 2017 . The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period. Nonrecurring Measurements Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument: Impaired loans —A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. 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 $ 14,616 $ — $ — $ 14,616 $ 1,208 $ 1,208 OREO 1,240 — — 1,240 445 445 $ 15,856 $ — $ — $ 15,856 $ 1,653 $ 1,653 Fair value at September 30, 2017 Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended September 30, 2017 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 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) $ 14,616 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 54.51% (6.66%) OREO $ 1,240 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount applied to appraisal value or stated value (in the case of accounts receivable, fixed assets, and inventory). (2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values. (3) Collateral consists of accounts receivable, fixed assets, inventory, cash, real estate and state guarantee. Fair value at September 30, 2017 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 government agency guarantee. (4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided. The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at September 30, 2018 and December 31, 2017 : September 30, 2018 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 220,706 $ 220,706 $ 220,706 $ — $ — Interest-earning deposits with banks 21,456 21,456 21,456 — — Debt securities available for sale 2,921,114 2,921,114 247 2,920,867 — Equity securities 4,901 4,901 4,901 — — FHLB stock 16,640 16,640 — 16,640 — Loans held for sale 5,275 5,275 — 5,275 — Loans 8,430,530 8,425,433 — — 8,425,433 Interest rate contracts 10,479 10,479 — 10,479 — Liabilities Time deposits $ 431,496 $ 423,165 $ — $ 423,165 $ — FHLB advances 166,536 166,999 — 166,999 — Repurchase agreements 62,197 62,197 — 62,197 — Subordinated debentures 35,508 35,001 — 35,001 — Interest rate contracts 10,478 10,478 — 10,478 — December 31, 2017 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 244,615 $ 244,615 $ 244,615 $ — $ — Interest-earning deposits with banks 97,918 97,918 97,918 — — Debt securities available for sale 2,737,751 2,737,751 248 2,737,503 — Equity securities 5,080 5,080 5,080 — — FHLB stock 10,440 10,440 — 10,440 — Loans held for sale 5,766 5,766 — 5,766 — Loans 8,283,011 8,055,817 — — 8,055,817 Interest rate contracts 6,707 6,707 — 6,707 — Liabilities Time deposits $ 491,045 $ 483,095 $ — $ 483,095 $ — FHLB advances 11,579 12,281 — 12,281 — Repurchase agreements 79,059 79,070 — 79,070 — Subordinated debentures 35,647 35,895 — 35,895 — Junior subordinated debentures 8,248 8,248 — 8,248 — Interest rate contracts 6,714 6,714 — 6,714 —

Earnings per Common Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings per Common Share The Company applies the two-class method of computing basic and diluted EPS. Under the two-class method, EPS is determined for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. The Company issues restricted shares under share-based compensation plans and preferred shares which qualify as participating securities. The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 (in thousands except per share) Basic EPS: Net income $ 46,415 $ 40,769 $ 128,134 $ 97,100 Less: Earnings allocated to participating securities: Preferred shares — — — 4 Nonvested restricted shares 504 558 1,413 1,325 Earnings allocated to common shareholders $ 45,911 $ 40,211 $ 126,721 $ 95,771 Weighted average common shares outstanding 72,427 57,566 72,370 57,459 Basic earnings per common share $ 0.63 $ 0.70 $ 1.75 $ 1.67 Diluted EPS: Earnings allocated to common shareholders $ 45,911 $ 40,211 $ 126,721 $ 95,771 Weighted average common shares outstanding 72,427 57,566 72,370 57,459 Dilutive effect of equity awards 5 5 4 6 Weighted average diluted common shares outstanding 72,432 57,571 72,374 57,465 Diluted earnings per common share $ 0.63 $ 0.70 $ 1.75 $ 1.67 Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive — 12 5 13

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers Revenue in the scope of Topic 606, Revenue from Contracts with Customers is measured based on the consideration specified in the contract with a customer and excludes amounts collected on behalf of third parties. The vast majority of the Company’s revenue is specifically outside the scope of Topic 606. For in-scope revenue, the following is a description of principal activities, separated by the timing of revenue recognition from which the Company generates its revenue from contracts with customers. a. Revenue earned at a point in time - Examples of revenue earned at a point in time are ATM transaction fees, wire transfer fees, overdraft fees, interchange fees and foreign exchange transaction fees. Revenue is primarily based on the number and type of transactions and is generally derived from transactional information accumulated by our systems and is recognized immediately as the transactions occur or upon providing the service to complete the customer’s transaction. The Company is the principal in each of these contracts, with the exception of interchange fees, in which case we are acting as the agent and record revenue net of expenses paid to the principal. b. Revenue earned over time - The Company earns revenue from contracts with customers in a variety of ways where the revenue is earned over a period of time - generally monthly. Examples of this type of revenue are deposit account maintenance fees, investment advisory fees, merchant revenue and safe deposit box fees. Revenue is generally derived from transactional information accumulated by our systems or those of third-parties and is recognized as the related transactions occur or services are rendered to the customer. The Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered and our contracts generally do not include multiple performance obligations. As a result, there are no contract balances as payments and services are rendered simultaneously. Payment is generally collected at the time services are rendered, monthly or quarterly. Unsatisfied performance obligations at the report date are not material to our consolidated financial statements. In certain cases, other parties are involved with providing products and services to our customers. If the Company is principal in the transaction (providing goods or services itself), revenues are reported based on the gross consideration received from the customer and any related expenses are reported gross in noninterest expense. If the Company is an agent in the transaction (arranging for another party to provide goods or services), the Company reports its net fee or commission retained as revenue. Rebates, waivers and reversals are recorded as a reduction of the transaction price either when the revenue is recognized by the Company or at the time the rebate, waiver or reversal is earned by the customer. Practical expedients The Company applies the practical expedient in paragraph 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service will be one year or less. The Company pays sales commissions to its employees in accordance with certain incentive plans and in connection with obtaining certain contracts with customers. The Company applies the practical expedient in paragraph 340-40-25-4 and expenses such sales commissions when incurred if the amortization period of the asset the Company otherwise would have recognized is one year or less. Sales commissions are included in compensation and employee benefits expense. For the Company’s contracts that have an original expected duration of one year or less, the Company uses the practical expedient in paragraph 606-10-50-14 and has not disclosed the amount of the transaction price allocated to unsatisfied performance obligations as of the end of each reporting period or when the Company expects to recognize this revenue. Disaggregation of revenue The following table shows the disaggregation of revenue from contracts with customers for the three and nine month periods ended September 30, 2018 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2018 (dollars in thousands) Noninterest income: Revenue from contracts with customers: Deposit account and treasury management fees $ 9,266 $ 26,689 Card revenue 3,714 16,143 Financial services and trust revenue 2,975 8,924 Total revenue from contracts with customers 15,955 51,756 Other sources of noninterest income 5,064 16,098 Total noninterest income $ 21,019 $ 67,854

Business Combinations (Tables)

Business Combinations (Tables) - Pacific Continental [Member]	9 Months Ended
	Sep. 30, 2018
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed: November 1, 2017 (in thousands) Merger consideration $ 637,103 Identifiable net assets acquired, at fair value Assets acquired Cash and cash equivalents $ 81,190 Investment securities 449,291 Federal Home Loan Bank stock 7,084 Loans 1,873,987 Interest receivable 7,827 Premises and equipment 27,343 Other real estate owned 10,279 Core deposit intangible 46,875 Other assets 50,638 Total assets acquired 2,554,514 Liabilities assumed Deposits (2,118,982 ) Federal Home Loan Bank advances (101,127 ) Subordinated debentures (35,678 ) Junior subordinated debentures (14,434 ) Securities sold under agreements to repurchase (1,617 ) Other liabilities (28,653 ) Total liabilities assumed (2,300,491 ) Total fair value of identifiable net assets 254,023 Goodwill $ 383,080
Business Acquisition, Pro Forma Information [Table Text Block]	For illustrative purposes only, the following table presents certain unaudited pro forma information for the nine months ended September 30, 2017 . This unaudited, estimated pro forma financial information was calculated as if Pacific Continental had been acquired as of the beginning of the year prior to the date of acquisition. This unaudited pro forma information combines the historical results of Pacific Continental with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred as of the beginning of the year prior to the acquisition. In particular, no adjustments have been made to eliminate the impact of other-than-temporary impairment losses and losses recognized on the sale of securities that may not have been necessary had the investment securities been recorded at fair value as of the beginning of the year prior to the date of acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value. Additionally, Columbia expects to achieve further operating cost savings and other business synergies, including revenue growth as a result of the acquisition, which are not reflected in the pro forma amounts that follow. As a result, actual amounts would have differed from the unaudited pro forma information presented. Unaudited Pro Forma Nine Months Ended September 30, 2017 (in thousands except per share) Total revenues (net interest income plus noninterest income) $ 432,060 Net income $ 122,410 Earnings per share - basic $ 1.70 Earnings per share - diluted $ 1.70
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]	The following table shows the impact of the acquisition-related expenses related to the acquisition of Pacific Continental for the periods indicated to the various components of noninterest expense: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Noninterest Expense Compensation and employee benefits $ 923 $ 3 $ 3,410 $ 3 Occupancy 29 593 1,619 945 Advertising and promotion — 184 534 201 Data processing 20 66 941 539 Legal and professional fees 102 157 893 1,587 Taxes, licenses and fees — — — 3 Other 7 168 771 280 Total impact of acquisition-related costs to noninterest expense $ 1,081 $ 1,171 $ 8,168 $ 3,558

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Securities Available for Sale	The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of debt securities available for sale: Amortized Gross Gross Fair Value September 30, 2018 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,997,736 $ 295 $ (69,199 ) $ 1,928,832 State and municipal securities 578,132 1,927 (12,241 ) 567,818 U.S. government agency and government-sponsored enterprise securities 433,267 37 (9,087 ) 424,217 U.S. government securities 251 — (4 ) 247 Total $ 3,009,386 $ 2,259 $ (90,531 ) $ 2,921,114 December 31, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,752,236 $ 1,815 $ (27,326 ) $ 1,726,725 State and municipal securities 593,940 6,023 (3,959 ) 596,004 U.S. government agency and government-sponsored enterprise securities 416,894 642 (2,762 ) 414,774 U.S. government securities 251 — (3 ) 248 Total $ 2,763,321 $ 8,480 $ (34,050 ) $ 2,737,751
Schedule of gross realized gains and losses on sales and calls of securities available for sale	The following table provides the proceeds and both gross realized gains and losses on sales of debt securities available for sale as well as other securities gains and losses for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 (in thousands) Proceeds from sales of debt securities available for sale $ — $ — $ 32,330 $ — Gross realized gains from sales of debt securities available for sale $ — $ — $ 235 $ — Gross realized losses from sales of debt securities available for sale — — (129 ) — Other securities losses, net (1) (62 ) — (179 ) — Investment securities losses, net $ (62 ) $ — $ (73 ) $ — __________ (1) Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.
Schedule of Contractual Maturities of Investment Securities Available for Sale	The scheduled contractual maturities of debt securities available for sale at September 30, 2018 are presented as follows: September 30, 2018 Amortized Cost Fair Value (in thousands) Due within one year $ 126,071 $ 126,253 Due after one year through five years 612,279 598,770 Due after five years through ten years 1,144,161 1,113,290 Due after ten years 1,126,875 1,082,801 Total debt securities available for sale $ 3,009,386 $ 2,921,114
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, 2018 (in thousands) Washington and Oregon State to secure public deposits $ 256,078 Federal Reserve Bank to secure borrowings 51,843 Other securities pledged 119,981 Total securities pledged as collateral $ 427,902
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses	The following table shows the gross unrealized losses and fair value of the Company’s debt securities available for sale with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2018 and December 31, 2017 : Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized September 30, 2018 (in thousands) U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 1,084,529 $ (26,966 ) $ 834,985 $ (42,233 ) $ 1,919,514 $ (69,199 ) State and municipal securities 333,523 (6,833 ) 96,018 (5,408 ) 429,541 (12,241 ) U.S. government agency and government-sponsored enterprise securities 300,519 (6,269 ) 120,102 (2,818 ) 420,621 (9,087 ) U.S. government securities — — 247 (4 ) 247 (4 ) Total $ 1,718,571 $ (40,068 ) $ 1,051,352 $ (50,463 ) $ 2,769,923 $ (90,531 ) December 31, 2017 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 816,678 $ (6,710 ) $ 717,211 $ (20,616 ) $ 1,533,889 $ (27,326 ) State and municipal securities 220,019 (1,723 ) 75,172 (2,236 ) 295,191 (3,959 ) U.S. government agency and government-sponsored enterprise securities 184,046 (1,006 ) 155,983 (1,756 ) 340,029 (2,762 ) U.S. government securities 249 (3 ) — — 249 (3 ) Total $ 1,220,992 $ (9,442 ) $ 948,366 $ (24,608 ) $ 2,169,358 $ (34,050 )

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Analysis of Loan Portfolio by Major Types of Loans	The following is an analysis of the loan portfolio by segment (net of unearned income): September 30, 2018 December 31, 2017 Loans, excluding PCI loans PCI Loans Total Loans, excluding PCI loans PCI Loans Total (in thousands) Commercial business $ 3,554,147 $ 11,164 $ 3,565,311 $ 3,377,324 $ 12,628 $ 3,389,952 Real estate: One-to-four family residential 232,924 8,356 241,280 188,396 12,395 200,791 Commercial and multifamily residential 3,786,615 66,748 3,853,363 3,825,739 75,594 3,901,333 Total real estate 4,019,539 75,104 4,094,643 4,014,135 87,989 4,102,124 Real estate construction: One-to-four family residential 211,629 159 211,788 200,518 177 200,695 Commercial and multifamily residential 349,328 579 349,907 371,931 607 372,538 Total real estate construction 560,957 738 561,695 572,449 784 573,233 Consumer 327,863 8,930 336,793 334,190 11,269 345,459 Less: Net unearned income (44,125 ) — (44,125 ) (52,111 ) — (52,111 ) Total loans, net of unearned income 8,418,381 95,936 8,514,317 8,245,987 112,670 8,358,657 Less: Allowance for loan and lease losses (79,770 ) (4,017 ) (83,787 ) (68,739 ) (6,907 ) (75,646 ) Total loans, net $ 8,338,611 $ 91,919 $ 8,430,530 $ 8,177,248 $ 105,763 $ 8,283,011 Loans held for sale $ 5,275 $ — $ 5,275 $ 5,766 $ — $ 5,766
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Analysis of Nonaccrual Loans	The following is an analysis of nonaccrual loans as of September 30, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 Recorded Unpaid Principal Recorded Unpaid Principal (in thousands) Commercial business: Secured $ 45,753 $ 57,049 $ 45,410 $ 56,865 Unsecured — — 50 49 Real estate: One-to-four family residential 501 508 785 1,182 Commercial & multifamily residential: Commercial land 2,461 2,470 2,628 2,623 Income property 1,873 2,523 4,284 5,410 Owner occupied 6,678 6,992 7,029 7,270 Real estate construction: One-to-four family residential: Land and acquisition 318 318 25 26 Residential construction — — 1,829 1,828 Consumer 2,748 2,937 4,149 4,633 Total $ 60,332 $ 72,797 $ 66,189 $ 79,886
Analysis of the Aged Loan Portfolio	The following is an aging of the recorded investment of the loan portfolio as of September 30, 2018 and December 31, 2017 : Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans September 30, 2018 (in thousands) Commercial business: Secured $ 3,365,159 $ 7,141 $ 2,258 $ — $ 9,399 $ 45,753 $ 3,420,311 Unsecured 117,801 1,118 — — 1,118 — 118,919 Real estate: One-to-four family residential 229,685 341 784 — 1,125 501 231,311 Commercial & multifamily residential: Commercial land 278,777 — — — — 2,461 281,238 Income property 1,880,405 3,339 2,073 — 5,412 1,873 1,887,690 Owner occupied 1,588,662 1,929 — — 1,929 6,678 1,597,269 Real estate construction: One-to-four family residential: Land and acquisition 5,320 325 — — 325 318 5,963 Residential construction 200,484 4,144 — — 4,144 — 204,628 Commercial & multifamily residential: Income property 253,470 — 166 — 166 — 253,636 Owner occupied 90,511 — — — — — 90,511 Consumer 322,085 1,788 284 — 2,072 2,748 326,905 Total $ 8,332,359 $ 20,125 $ 5,565 $ — $ 25,690 $ 60,332 $ 8,418,381 Current 30 - 59 60 - 89 Greater Total Nonaccrual Total Loans December 31, 2017 (in thousands) Commercial business: Secured $ 3,185,321 $ 2,530 $ 2,400 $ — $ 4,930 $ 45,410 $ 3,235,661 Unsecured 123,524 100 501 — 601 50 124,175 Real estate: One-to-four family residential 184,256 1,111 402 — 1,513 785 186,554 Commercial & multifamily residential: Commercial land 292,680 92 — 581 673 2,628 295,981 Income property 1,898,655 2,426 971 — 3,397 4,284 1,906,336 Owner occupied 1,590,004 2,485 468 — 2,953 7,029 1,599,986 Real estate construction: One-to-four family residential: Land and acquisition 9,882 — — — — 25 9,907 Residential construction 187,862 — — — — 1,829 189,691 Commercial & multifamily residential: Income property 293,028 — — — — — 293,028 Owner occupied 72,443 — — — — — 72,443 Consumer 325,928 1,446 702 — 2,148 4,149 332,225 Total $ 8,163,583 $ 10,190 $ 5,444 $ 581 $ 16,215 $ 66,189 $ 8,245,987
Impaired Financing Receivables	The following is an analysis of impaired loans as of September 30, 2018 and December 31, 2017 : Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid September 30, 2018 (in thousands) Commercial business: Secured $ 3,379,535 $ 40,776 $ 7,402 $ 7,875 $ 1,139 $ 33,374 $ 38,293 Unsecured 118,897 22 — — — 22 21 Real estate: One-to-four family residential 230,915 396 337 606 8 59 256 Commercial & multifamily residential: Commercial land 279,008 2,230 — — — 2,230 2,274 Income property 1,884,936 2,754 110 175 1 2,644 2,789 Owner occupied 1,587,550 9,719 3,274 4,693 71 6,445 6,692 Real estate construction: One-to-four family residential: Land and acquisition 5,963 — — — — — — Residential construction 204,628 — — — — — — Commercial & multifamily residential: Income property 253,636 — — — — — — Owner occupied 86,461 4,050 — — — 4,050 4,050 Consumer 322,162 4,743 3,702 3,953 36 1,041 1,056 Total $ 8,353,691 $ 64,690 $ 14,825 $ 17,302 $ 1,255 $ 49,865 $ 55,431 Recorded Investment Recorded Investment Impaired Loans With Impaired Loans Without Recorded Unpaid Related Recorded Unpaid December 31, 2017 (in thousands) Commercial business: Secured $ 3,195,649 $ 40,012 $ 3,808 $ 3,937 $ 1,867 $ 36,204 $ 42,314 Unsecured 124,150 25 25 24 3 — — Real estate: One-to-four family residential 185,659 895 867 1,408 103 28 337 Commercial & multifamily residential: Commercial land 293,694 2,287 — — — 2,287 2,282 Income property 1,901,313 5,023 2,768 3,328 185 2,255 2,601 Owner occupied 1,591,298 8,688 77 80 3 8,611 10,077 Real estate construction: One-to-four family residential: Land and acquisition 9,907 — — — — — — Residential construction 188,481 1,210 — — — 1,210 1,210 Commercial & multifamily residential: Income property 293,028 — — — — — — Owner occupied 68,393 4,050 — — — 4,050 4,050 Consumer 325,210 7,015 5,303 5,568 199 1,712 1,864 Total $ 8,176,782 $ 69,205 $ 12,848 $ 14,345 $ 2,360 $ 56,357 $ 64,735 The following table provides additional information on impaired loans for the three and nine month periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized Average Recorded Interest Recognized (in thousands) Commercial business: Secured $ 43,805 $ 2 $ 22,395 $ 2 $ 43,055 $ 43 $ 15,349 $ 25 Unsecured 444 — — — 234 1 — — Real estate: One-to-four family residential 545 12 856 15 713 30 688 37 Commercial & multifamily residential: Commercial land 2,246 26 2,549 — 2,407 26 2,026 — Income property 2,443 34 4,214 21 3,367 96 4,137 27 Owner occupied 9,349 124 4,530 127 8,986 333 4,496 319 Real estate construction: One-to-four family residential: Land and acquisition — — — — — — 4 — Residential construction — — — — 605 — 84 — Commercial & multifamily residential: Owner occupied 4,050 72 2,025 151 4,050 174 1,012 151 Consumer 5,646 44 6,054 58 6,135 110 5,712 105 Total $ 68,528 $ 314 $ 42,623 $ 374 $ 69,552 $ 813 $ 33,508 $ 664
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, 2018 and 2017 : Three months ended September 30, 2018 Three months ended September 30, 2017 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 1 $ 14,511 $ 14,511 2 $ 808 $ 808 Real estate: One-to-four family residential — — — 2 201 201 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 3 123 123 17 1,672 1,672 Total 4 $ 14,634 $ 14,634 24 $ 7,961 $ 7,961 Nine months ended September 30, 2018 Nine months ended September 30, 2017 Number of TDR Modifications Pre-Modification Post-Modification Number of TDR Modifications Pre-Modification Post-Modification (dollars in thousands) Commercial business: Secured 9 $ 17,605 $ 17,605 7 $ 2,586 $ 2,586 Real estate: One-to-four family residential — — — 3 583 583 Commercial and multifamily residential: Income property 1 891 891 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 18 2,540 2,540 35 4,033 4,033 Total 28 $ 21,036 $ 21,036 48 $ 12,482 $ 12,482
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, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 (in thousands) Commercial business $ 11,603 $ 13,753 Real estate: One-to-four family residential 10,243 14,610 Commercial and multifamily residential 70,344 79,211 Total real estate 80,587 93,821 Real estate construction: One-to-four family residential 159 177 Commercial and multifamily residential 552 595 Total real estate construction 711 772 Consumer 9,880 12,412 Subtotal of PCI loans 102,781 120,758 Less: Valuation discount resulting from acquisition accounting 6,845 8,088 Allowance for loan losses 4,017 6,907 PCI loans, net of allowance for loan losses $ 91,919 $ 105,763
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, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 25,350 $ 35,706 $ 31,176 $ 45,191 Accretion (2,233 ) (2,766 ) (6,435 ) (9,830 ) Disposals (221 ) — (387 ) (158 ) Reclassifications from (to) nonaccretable difference 279 (892 ) (1,179 ) (3,155 ) Balance at end of period $ 23,175 $ 32,048 $ 23,175 $ 32,048

Allowance for Loan and Lease _2

Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)	9 Months Ended
	Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Credit Losses on Financing Receivables	The following tables show a detailed analysis of the allowance for the three and nine months ended September 30, 2018 and 2017 : Beginning Charge-offs Recoveries Provision (Recapture) Ending Specific General Three months ended September 30, 2018 (in thousands) Commercial business: Secured $ 40,350 $ (576 ) $ 496 $ 2,912 $ 43,182 $ 1,139 $ 42,043 Unsecured 2,443 (30 ) 51 (41 ) 2,423 — 2,423 Real estate: One-to-four family residential 461 — 21 (110 ) 372 8 364 Commercial & multifamily residential: Commercial land 3,278 — 8 (87 ) 3,199 — 3,199 Income property 4,102 — 202 (292 ) 4,012 1 4,011 Owner occupied 4,356 — 3 316 4,675 71 4,604 Real estate construction: One-to-four family residential: Land and acquisition 848 — 582 (742 ) 688 — 688 Residential construction 4,572 — 1 660 5,233 — 5,233 Commercial & multifamily residential: Income property 7,367 — — 573 7,940 — 7,940 Owner occupied 2,299 — — 138 2,437 — 2,437 Consumer 5,292 (277 ) 266 (258 ) 5,023 36 4,987 Purchased credit impaired 4,782 (1,208 ) 945 (502 ) 4,017 — 4,017 Unallocated — — — 586 586 — 586 Total $ 80,150 $ (2,091 ) $ 2,575 $ 3,153 $ 83,787 $ 1,255 $ 82,532 Beginning Charge-offs Recoveries Provision (Recapture) Ending Specific General Nine months ended September 30, 2018 (in thousands) Commercial business: Secured $ 29,341 $ (8,741 ) $ 2,536 $ 20,046 $ 43,182 $ 1,139 $ 42,043 Unsecured 2,000 (117 ) 356 184 2,423 — 2,423 Real estate: One-to-four family residential 701 — 389 (718 ) 372 8 364 Commercial & multifamily residential: Commercial land 4,265 — 92 (1,158 ) 3,199 — 3,199 Income property 5,672 (223 ) 901 (2,338 ) 4,012 1 4,011 Owner occupied 5,459 — 19 (803 ) 4,675 71 4,604 Real estate construction: One-to-four family residential: Land and acquisition 963 — 610 (885 ) 688 — 688 Residential construction 3,709 — 6 1,518 5,233 — 5,233 Commercial & multifamily residential: Income property 7,053 — — 887 7,940 — 7,940 Owner occupied 4,413 — — (1,976 ) 2,437 — 2,437 Consumer 5,163 (773 ) 796 (163 ) 5,023 36 4,987 Purchased credit impaired 6,907 (3,786 ) 3,096 (2,200 ) 4,017 — 4,017 Unallocated — — — 586 586 — 586 Total $ 75,646 $ (13,640 ) $ 8,801 $ 12,980 $ 83,787 $ 1,255 $ 82,532 Beginning Charge-offs Recoveries Provision (Recapture) 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 (Recapture) 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
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, 2018 2017 2018 2017 (in thousands) Balance at beginning of period $ 3,680 $ 3,555 $ 3,130 $ 2,705 Net changes in the allowance for unfunded commitments and letters of credit 275 (75 ) 825 775 Balance at end of period $ 3,955 $ 3,480 $ 3,955 $ 3,480
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, 2018 and December 31, 2017 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2018 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 3,202,147 $ 83,986 $ 134,178 $ — $ — $ 3,420,311 Unsecured 118,885 33 1 — — 118,919 Real estate: One-to-four family residential 229,704 — 1,607 — — 231,311 Commercial and multifamily residential: Commercial land 272,838 3,423 4,977 — — 281,238 Income property 1,857,338 19,474 10,878 — — 1,887,690 Owner occupied 1,532,093 27,182 37,994 — — 1,597,269 Real estate construction: One-to-four family residential: Land and acquisition 5,645 — 318 — — 5,963 Residential construction 204,628 — — — — 204,628 Commercial and multifamily residential: Income property 253,636 — — — — 253,636 Owner occupied 86,461 — 4,050 — — 90,511 Consumer 322,595 — 4,310 — — 326,905 Total $ 8,085,970 $ 134,098 $ 198,313 $ — $ — 8,418,381 Less: Allowance for loan and lease losses 79,770 Loans, excluding PCI loans, net $ 8,338,611 Pass Special Mention Substandard Doubtful Loss Total December 31, 2017 (in thousands) Loans, excluding PCI loans: Commercial business: Secured $ 3,049,031 $ 64,600 $ 122,030 $ — $ — $ 3,235,661 Unsecured 123,621 — 554 — — 124,175 Real estate: One-to-four family residential 183,312 1,186 2,056 — — 186,554 Commercial and multifamily residential: Commercial land 283,673 5,204 7,104 — — 295,981 Income property 1,857,832 17,181 31,323 — — 1,906,336 Owner occupied 1,546,775 7,380 45,831 — — 1,599,986 Real estate construction: One-to-four family residential: Land and acquisition 9,882 — 25 — — 9,907 Residential construction 187,863 — 1,828 — — 189,691 Commercial and multifamily residential: Income property 293,028 — — — — 293,028 Owner occupied 68,393 — 4,050 — — 72,443 Consumer 323,129 — 9,096 — — 332,225 Total $ 7,926,539 $ 95,551 $ 223,897 $ — $ — 8,245,987 Less: Allowance for loan and lease losses 68,739 Loans, excluding PCI loans, net $ 8,177,248 The following is an analysis of the credit quality of our PCI loan portfolio as of September 30, 2018 and December 31, 2017 : Pass Special Mention Substandard Doubtful Loss Total September 30, 2018 (in thousands) PCI loans: Commercial business: Secured $ 9,732 $ — $ 947 $ — $ — $ 10,679 Unsecured 824 — 100 — — 924 Real estate: One-to-four family residential 10,021 — 222 — — 10,243 Commercial and multifamily residential: Commercial land 10,583 — — — — 10,583 Income property 20,444 — 1,898 — — 22,342 Owner occupied 37,042 — 377 — — 37,419 Real estate construction: One-to-four family residential: Land and acquisition 155 — 4 — — 159 Residential construction — — — — — — Commercial and multifamily residential: Income property 552 — — — — 552 Owner occupied — — — — — — Consumer 9,638 — 242 — — 9,880 Total $ 98,991 $ — $ 3,790 $ — $ — 102,781 Less: Valuation discount resulting from acquisition accounting 6,845 Allowance for loan losses 4,017 PCI loans, net $ 91,919 Pass Special Mention Substandard Doubtful Loss Total December 31, 2017 (in thousands) PCI loans: Commercial business: Secured $ 11,918 $ — $ 723 $ — $ — $ 12,641 Unsecured 1,045 — 67 — — 1,112 Real estate: One-to-four family residential 13,817 — 793 — — 14,610 Commercial and multifamily residential: Commercial land 9,460 349 — — — 9,809 Income property 25,981 — 35 — — 26,016 Owner occupied 42,617 — 769 — — 43,386 Real estate construction: One-to-four family residential: Land and acquisition 169 — 8 — — 177 Residential construction — — — — — — Commercial and multifamily residential: Income property 595 — — — — 595 Owner occupied — — — — — — Consumer 11,705 — 707 — — 12,412 Total $ 117,307 $ 349 $ 3,102 $ — $ — 120,758 Less: Valuation discount resulting from acquisition accounting 8,088 Allowance for loan losses 6,907 PCI loans, net $ 105,763

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	9 Months Ended
	Sep. 30, 2018
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Summary of Other Real Estate Owned	The following tables set forth activity in OREO for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Balance, beginning of period $ 7,080 $ 4,058 $ 13,298 $ 5,998 Transfers in 794 74 1,200 74 Valuation adjustments (495 ) (138 ) (697 ) (364 ) Proceeds from sale of OREO property (47 ) (182 ) (5,868 ) (1,901 ) Loss on sale of OREO, net (1 ) (130 ) (602 ) (125 ) Balance, end of period $ 7,331 $ 3,682 $ 7,331 $ 3,682

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	The following table sets forth activity for goodwill and other intangible assets for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Goodwill Total goodwill (1) $ 765,842 $ 382,762 $ 765,842 $ 382,762 Other intangible assets, net Core deposit intangible: Gross core deposit intangible balance at beginning of period 105,473 58,598 105,473 58,598 Accumulated amortization at beginning of period (54,495 ) (44,484 ) (48,219 ) (41,886 ) Core deposit intangible, net at beginning of period 50,978 14,114 57,254 16,712 CDI current period amortization (3,070 ) (1,188 ) (9,346 ) (3,786 ) Total core deposit intangible, net at end of period 47,908 12,926 47,908 12,926 Intangible assets not subject to amortization 919 919 919 919 Other intangible assets, net at end of period 48,827 13,845 48,827 13,845 Total goodwill and other intangible assets at end of period $ 814,669 $ 396,607 $ 814,669 $ 396,607 __________ (1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.
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, 2018 and the succeeding four years: Amount (in thousands) Year ending December 31, 2018 $ 2,890 2019 10,479 2020 8,724 2021 7,264 2022 5,880

Derivatives and Balance Sheet_2

Derivatives and Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative [Line Items]
Balance Sheet Offsetting [Table Text Block]	The following tables show the gross interest rate swap agreements and repurchase agreements in the Consolidated Balance Sheets and the respective collateral received or pledged in the form of cash or 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, 2018 (in thousands) Assets Interest rate contracts $ 10,479 $ — $ 10,479 $ — $ 10,479 Liabilities Interest rate contracts $ 10,478 $ — $ 10,478 $ (9,595 ) $ 883 Repurchase agreements $ 62,197 $ — $ 62,197 $ (62,197 ) $ — December 31, 2017 Assets Interest rate contracts $ 6,707 $ — $ 6,707 $ — $ 6,707 Liabilities Interest rate contracts $ 6,714 $ — $ 6,714 $ (6,714 ) $ — Repurchase agreements $ 79,059 $ — $ 79,059 $ (79,059 ) $ —
Carrying Value of Securities Pledged As Collateral	The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law: September 30, 2018 (in thousands) Washington and Oregon State to secure public deposits $ 256,078 Federal Reserve Bank to secure borrowings 51,843 Other securities pledged 119,981 Total securities pledged as collateral $ 427,902
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, 2018 and December 31, 2017 : Asset Derivatives Liability Derivatives September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value Balance Sheet Fair Value (in thousands) Interest rate contracts Other assets $ 10,479 Other assets $ 6,707 Other liabilities $ 10,478 Other liabilities $ 6,714
Available-for-sale Securities [Member]
Derivative [Line Items]
Carrying Value of Securities Pledged As Collateral	The following table presents the class of collateral pledged for repurchase agreements as well as the remaining contractual maturity of the repurchase agreements: Remaining contractual maturity of the agreements Overnight and continuous Up to 30 days 30 - 90 days Greater than 90 days Total September 30, 2018 (in thousands) Class of collateral pledged for repurchase agreements U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations $ 62,197 $ — $ — $ — $ 62,197 Gross amount of recognized liabilities for repurchase agreements 62,197 Amounts related to agreements not included in offsetting disclosure $ —

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table shows changes in accumulated other comprehensive income (loss) by component for the three and nine month periods ended September 30, 2018 and 2017 : Unrealized Gains and Losses on Available-for-Sale Securities (1) Unrealized Gains and Losses on Pension Plan Liability (1) Total (1) Three months ended September 30, 2018 (in thousands) Beginning balance $ (53,597 ) $ (2,324 ) $ (55,921 ) Other comprehensive loss before reclassifications (14,149 ) — (14,149 ) Amounts reclassified from accumulated other comprehensive loss — 61 61 Net current-period other comprehensive income (loss) (14,149 ) 61 (14,088 ) Ending balance $ (67,746 ) $ (2,263 ) $ (70,009 ) Three months ended September 30, 2017 Beginning balance $ (4,969 ) $ (1,559 ) $ (6,528 ) Other comprehensive income before reclassifications 549 — 549 Amounts reclassified from accumulated other comprehensive loss — 46 46 Net current-period other comprehensive income 549 46 595 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) Nine months ended September 30, 2018 Beginning balance $ (19,779 ) $ (2,446 ) $ (22,225 ) Adjustment pursuant to adoption of ASU 2016-01 157 — 157 Other comprehensive loss before reclassifications (48,043 ) — (48,043 ) Amounts reclassified from accumulated other comprehensive loss (81 ) 183 102 Net current-period other comprehensive income (loss) (48,124 ) 183 (47,941 ) Ending balance $ (67,746 ) $ (2,263 ) $ (70,009 ) 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 loss — 178 178 Net current-period other comprehensive income 8,284 4,782 13,066 Ending balance $ (4,420 ) $ (1,513 ) $ (5,933 ) __________ (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, 2018 and 2017 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Three Months Ended September 30, Nine Months Ended September 30, Affected line Item in the Consolidated 2018 2017 2018 2017 Statement of Income (in thousands) Unrealized gains and losses on available-for-sale debt securities Investment securities gains, net $ — $ — $ 106 $ — Investment securities losses, net — — 106 — Total before tax — — (25 ) — Income tax provision $ — $ — $ 81 $ — Net of tax Amortization of pension plan liability Actuarial losses $ (80 ) $ (72 ) $ (239 ) $ (279 ) Compensation and employee benefits (80 ) (72 ) (239 ) (279 ) Total before tax 19 26 56 101 Income tax benefit $ (61 ) $ (46 ) $ (183 ) $ (178 ) Net of tax

Fair Value Accounting and Mea_2

Fair Value Accounting and Measurement (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Assets, Quantitative Information	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, 2018 and December 31, 2017 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement: Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 September 30, 2018 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,928,832 $ — $ 1,928,832 $ — State and municipal debt securities 567,818 — 567,818 — U.S. government agency and government-sponsored enterprise securities 424,217 — 424,217 — U.S. government securities 247 247 — — Total debt securities available for sale $ 2,921,114 $ 247 $ 2,920,867 $ — Equity securities $ 4,901 $ 4,901 $ — $ — Other assets (Interest rate contracts) $ 10,479 $ — $ 10,479 $ — Liabilities Other liabilities (Interest rate contracts) $ 10,478 $ — $ 10,478 $ — Fair value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 December 31, 2017 (in thousands) Assets Debt securities available for sale: U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations $ 1,726,725 $ — $ 1,726,725 $ — State and municipal debt securities 596,004 — 596,004 — U.S. government agency and government-sponsored enterprise securities 414,774 — 414,774 — U.S. government securities 248 248 — — Total debt securities available for sale $ 2,737,751 $ 248 $ 2,737,503 $ — Equity securities $ 5,080 $ 5,080 $ — $ — Other assets (Interest rate contracts) $ 6,707 $ — $ 6,707 $ — Liabilities Other liabilities (Interest rate contracts) $ 6,714 $ — $ 6,714 $ —
Financial Assets Accounted For Fair Value On Nonrecurring Basis	The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods: Fair value at 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 $ 14,616 $ — $ — $ 14,616 $ 1,208 $ 1,208 OREO 1,240 — — 1,240 445 445 $ 15,856 $ — $ — $ 15,856 $ 1,653 $ 1,653 Fair value at September 30, 2017 Fair Value Measurements at Reporting Date Using Losses During the Three Months Ended Losses During the Nine Months Ended September 30, 2017 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, by Balance Sheet Grouping	The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at September 30, 2018 and December 31, 2017 : September 30, 2018 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 220,706 $ 220,706 $ 220,706 $ — $ — Interest-earning deposits with banks 21,456 21,456 21,456 — — Debt securities available for sale 2,921,114 2,921,114 247 2,920,867 — Equity securities 4,901 4,901 4,901 — — FHLB stock 16,640 16,640 — 16,640 — Loans held for sale 5,275 5,275 — 5,275 — Loans 8,430,530 8,425,433 — — 8,425,433 Interest rate contracts 10,479 10,479 — 10,479 — Liabilities Time deposits $ 431,496 $ 423,165 $ — $ 423,165 $ — FHLB advances 166,536 166,999 — 166,999 — Repurchase agreements 62,197 62,197 — 62,197 — Subordinated debentures 35,508 35,001 — 35,001 — Interest rate contracts 10,478 10,478 — 10,478 — December 31, 2017 Carrying Fair Level 1 Level 2 Level 3 (in thousands) Assets Cash and due from banks $ 244,615 $ 244,615 $ 244,615 $ — $ — Interest-earning deposits with banks 97,918 97,918 97,918 — — Debt securities available for sale 2,737,751 2,737,751 248 2,737,503 — Equity securities 5,080 5,080 5,080 — — FHLB stock 10,440 10,440 — 10,440 — Loans held for sale 5,766 5,766 — 5,766 — Loans 8,283,011 8,055,817 — — 8,055,817 Interest rate contracts 6,707 6,707 — 6,707 — Liabilities Time deposits $ 491,045 $ 483,095 $ — $ 483,095 $ — FHLB advances 11,579 12,281 — 12,281 — Repurchase agreements 79,059 79,070 — 79,070 — Subordinated debentures 35,647 35,895 — 35,895 — Junior subordinated debentures 8,248 8,248 — 8,248 — Interest rate contracts 6,714 6,714 — 6,714 —
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Assets, Quantitative Information	The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table: Fair value at Valuation Technique Unobservable Input Range (Weighted Average) (1) (dollars in thousands) Impaired loans - collateral-dependent (3) $ 14,616 Fair Market Value of Collateral Adjustment to Stated Value 0.00% - 54.51% (6.66%) OREO $ 1,240 Fair Market Value of Collateral Adjustment to Appraisal Value N/A (2) (1) Discount applied to appraisal value or stated value (in the case of accounts receivable, fixed assets, and inventory). (2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values. (3) Collateral consists of accounts receivable, fixed assets, inventory, cash, real estate and state guarantee. Fair value at September 30, 2017 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 government agency guarantee. (4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended Nine Months Ended September 30, September 30, 2018 2017 2018 2017 (in thousands except per share) Basic EPS: Net income $ 46,415 $ 40,769 $ 128,134 $ 97,100 Less: Earnings allocated to participating securities: Preferred shares — — — 4 Nonvested restricted shares 504 558 1,413 1,325 Earnings allocated to common shareholders $ 45,911 $ 40,211 $ 126,721 $ 95,771 Weighted average common shares outstanding 72,427 57,566 72,370 57,459 Basic earnings per common share $ 0.63 $ 0.70 $ 1.75 $ 1.67 Diluted EPS: Earnings allocated to common shareholders $ 45,911 $ 40,211 $ 126,721 $ 95,771 Weighted average common shares outstanding 72,427 57,566 72,370 57,459 Dilutive effect of equity awards 5 5 4 6 Weighted average diluted common shares outstanding 72,432 57,571 72,374 57,465 Diluted earnings per common share $ 0.63 $ 0.70 $ 1.75 $ 1.67 Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive — 12 5 13

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	Disaggregation of revenue The following table shows the disaggregation of revenue from contracts with customers for the three and nine month periods ended September 30, 2018 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2018 (dollars in thousands) Noninterest income: Revenue from contracts with customers: Deposit account and treasury management fees $ 9,266 $ 26,689 Card revenue 3,714 16,143 Financial services and trust revenue 2,975 8,924 Total revenue from contracts with customers 15,955 51,756 Other sources of noninterest income 5,064 16,098 Total noninterest income $ 21,019 $ 67,854

Accounting Pronouncements Rec_2

Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Sale Leaseback Transaction, Deferred Gain, Net	$ 1,000
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 0
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 67
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (157)
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			(117)
Common Stock [Member] | Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 184
Minimum [Member]
Operating Lease, Right-of-Use Asset	40,000
Maximum [Member]
Operating Lease, Right-of-Use Asset	$ 50,000

Business Combinations (Details)

Business Combinations (Details) - Pacific Continental [Member] - USD ($) $ / shares in Units, $ in Thousands	Nov. 01, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		$ 1,081	$ 1,171	$ 8,168	$ 3,558
Business Acquisition, Pro Forma Revenue					432,060
Business Combination, Consideration Transferred	$ 637,103
Business Acquisition, Effective Date of Acquisition	Nov. 1, 2017
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Purchase Price Allocation, Goodwill Amount	$ 383,080
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets	46,875
Business Combination, Purchase Price Allocation, Other Assets	50,638
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	2,554,514
Business Combination, Purchase Price Allocation, Liabilities, Deposits	(2,118,982)
Business Combination, Purchase Price Allocation, Federal Home Loan bank advances	(101,127)
Business Combination, Purchase Price Allocation, Subordinated Debt	(35,678)
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures	(14,434)
Business combination, purchase price allocation, securities sold under agreements to repurchase	(1,617)
Business Combination, Purchase Price Allocation, Other Liabilities	(28,653)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(2,300,491)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 254,023
business combinations, core deposit intangible percentage of core deposits	2.34%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 81,190
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	449,291
Business Combination, Purchase Price Allocation, FHLB Stock	7,084
Business Combination, Acquired Receivable, Fair Value	1,873,987
Business Combination, Purchase Price Allocation, Accrued Interest Receivable	7,827
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	27,343
Business Combination, Purchase Price Allocation, Other Real Estate Owned	$ 10,279
Business Acquisition, Pro Forma Net Income (Loss)					$ 122,410
Business Acquisition, Pro Forma Earnings Per Share, Basic					$ 1.70
Business Acquisition, Pro Forma Earnings Per Share, Diluted					$ 1.70
Compensation and employee benefits [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		923	3	3,410	$ 3
Occupancy [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		29	593	1,619	945
Advertising and promotion [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		0	184	534	201
Data processing [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		20	66	941	539
Legal and professional fees [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		102	157	893	1,587
Taxes, licenses and fees [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		0	0	0	3
Other noninterest expenses [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs		$ 7	$ 168	$ 771	$ 280

Securities (Securities Availabl

Securities (Securities Available for Sale) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 0	$ 0	$ 32,330	$ 0
Securities available-for-sale, amortized cost	3,009,386		3,009,386		$ 2,763,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,259		2,259		8,480
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	90,531		90,531		34,050
Debt Securities, Available-for-sale	2,921,114		2,921,114		2,737,751
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, amortized cost	1,997,736		1,997,736		1,752,236
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	295		295		1,815
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	69,199		69,199		27,326
Debt Securities, Available-for-sale	1,928,832		1,928,832		1,726,725
State and Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, amortized cost	578,132		578,132		593,940
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,927		1,927		6,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	12,241		12,241		3,959
Debt Securities, Available-for-sale	567,818		567,818		596,004
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, amortized cost	433,267		433,267		416,894
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	37		37		642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	9,087		9,087		2,762
Debt Securities, Available-for-sale	424,217		424,217		414,774
US Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, amortized cost	251		251		251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0		0		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4		4		3
Debt Securities, Available-for-sale	$ 247		$ 247		$ 248

Securities (Schedule of Contrac

Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Due within one year, Amortized Cost	$ 126,071
Due after one year through five years, Amortized Cost	612,279
Due after five years through ten years, Amortized Cost	1,144,161
Due after ten years, Amortized Cost	1,126,875
Securities available-for-sale, amortized cost	3,009,386	$ 2,763,321
Due within one year, Fair Value	126,253
Due after one year through five years, Fair Value	598,770
Due after five years through ten years, Fair Value	1,113,290
Due after ten years, Fair Value	1,082,801
Total investment securities available-for-sale, Fair Value	$ 2,921,114	$ 2,737,751

Securities (Carrying Value of S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) $ in Thousands	Sep. 30, 2018USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 427,902
Washington and Oregon State Public Deposits [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	256,078
Federal Reserve Bank Advances [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	51,843
Other Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Restricted	$ 119,981

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, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	$ 1,718,571	$ 1,220,992
Less than 12 Months Unrealized Losses	(40,068)	(9,442)
12 Months or More Fair Value	1,051,352	948,366
12 Months or More Unrealized Losses	(50,463)	(24,608)
Total Fair Value	2,769,923	2,169,358
Total Unrealized Losses	(90,531)	(34,050)
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	1,084,529	816,678
Less than 12 Months Unrealized Losses	(26,966)	(6,710)
12 Months or More Fair Value	834,985	717,211
12 Months or More Unrealized Losses	(42,233)	(20,616)
Total Fair Value	1,919,514	1,533,889
Total Unrealized Losses	(69,199)	(27,326)
State and Municipal Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	333,523	220,019
Less than 12 Months Unrealized Losses	(6,833)	(1,723)
12 Months or More Fair Value	96,018	75,172
12 Months or More Unrealized Losses	(5,408)	(2,236)
Total Fair Value	429,541	295,191
Total Unrealized Losses	(12,241)	(3,959)
US Government Corporations and Agencies Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	300,519	184,046
Less than 12 Months Unrealized Losses	(6,269)	(1,006)
12 Months or More Fair Value	120,102	155,983
12 Months or More Unrealized Losses	(2,818)	(1,756)
Total Fair Value	420,621	340,029
Total Unrealized Losses	(9,087)	(2,762)
US Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months Fair Value	0	249
Less than 12 Months Unrealized Losses	0	(3)
12 Months or More Fair Value	247	0
12 Months or More Unrealized Losses	(4)	0
Total Fair Value	247	249
Total Unrealized Losses	$ (4)	$ (3)

Securities (Narrative) (Details

Securities (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)security	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)security	Sep. 30, 2017USD ($)
Debt Securities, Available-for-sale [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale | $	$ 0	$ 0	$ 32,330	$ 0
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	481		481
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	153		153
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	458		458
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	92		92
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	54		54
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	14		14
US Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Number Of Securities In Continuous Loss Position For Twelve Months or More	1		1
Number Of Securities In Unrealized Loss Position	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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale of Debt Securities, Available-for-sale		$ 0	$ 0	$ 32,330	$ 0
Available-for-sale Securities, Gross Realized Gains		0	0	235	0
Available-for-sale Securities, Gross Realized Losses		0	0	(129)	0
Equity Securities, FV-NI, Unrealized Gain (Loss)	[1]	(62)	0	(179)	0
Gain (Loss) on Investments		$ (62)	$ 0	$ (73)	$ 0
[1]	Other securities losses, net includes net unrealized loss activity associated with equity securities. There were no sales of equity securities during the periods presented.

Loans (Narrative) (Details)

Loans (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017contract	Sep. 30, 2018USD ($)contract	Sep. 30, 2017contract	Dec. 31, 2017USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans to related parties	$ 9,700		$ 9,700		$ 10,000
Loans and Leases Receivable, Related Parties, Additions			14
Repayments on related party loans			$ 226
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	$ 3,180,000		$ 3,180,000		2,250,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 76,200		$ 76,200		$ 70,200

Loans (Analysis of Loan Portfol

Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	$ (44,125)		$ (52,111)
Recorded Investment	8,514,317		8,358,657
Allowance for loan losses	(83,787)	$ (80,150)	(75,646)	$ (71,616)	$ (72,984)	$ (70,043)
Loans, net	8,430,530		8,283,011
Loans held for sale	5,275		5,766
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	(44,125)		(52,111)
Recorded Investment	8,418,381		8,245,987
Allowance for loan losses	(79,770)		(68,739)
Loans, net	8,338,611		8,177,248
Loans held for sale	5,275		5,766
Loans and Leases Receivable, Gross	8,418,381		8,245,987
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: unearned income on loans	0		0
Recorded Investment	95,936		112,670
Allowance for loan losses	(4,017)		(6,907)
Loans, net	91,919		105,763
Loans held for sale	0		0
Loans and Leases Receivable, Gross	102,781		120,758
Acquisition Accounting Valuation Discount on Covered Loans	6,845		8,088
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	552		595
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	241,280		200,791
Loans and Leases Receivable, Gross, Consumer, Construction	211,788		200,695
Allowance for loan losses	(372)	(461)	(701)	(671)	(628)	(599)
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	232,924		188,396
Loans and Leases Receivable, Gross, Consumer, Construction	211,629		200,518
Loans and Leases Receivable, Gross	231,311		186,554
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer, Mortgage	8,356		12,395
Loans and Leases Receivable, Gross, Consumer, Construction	159		177
Loans and Leases Receivable, Gross	10,243		14,610
Commercial and Multifamily Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	3,853,363		3,901,333
Loans Receivable, Gross, Commercial, Construction	349,907		372,538
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	3,786,615		3,825,739
Loans Receivable, Gross, Commercial, Construction	349,328		371,931
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial, Mortgage	66,748		75,594
Loans Receivable, Gross, Commercial, Construction	579		607
Loans and Leases Receivable, Gross	70,344		79,211
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	3,565,311		3,389,952
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	3,554,147		3,377,324
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable, Gross, Commercial and Industrial	11,164		12,628
Loans and Leases Receivable, Gross	11,603		13,753
Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	4,094,643		4,102,124
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	4,019,539		4,014,135
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Mortgage	75,104		87,989
Loans and Leases Receivable, Gross	80,587		93,821
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	159		177
Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	561,695		573,233
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	560,957		572,449
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable Real Estate Construction	738		784
Loans and Leases Receivable, Gross	711		772
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	336,793		345,459
Allowance for loan losses	(5,023)	$ (5,292)	(5,163)	$ (3,673)	$ (3,551)	$ (3,534)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	327,863		334,190
Loans and Leases Receivable, Gross	326,905		332,225
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Consumer	8,930		11,269
Loans and Leases Receivable, Gross	$ 9,880		$ 12,412

Loans (Analysis of Nonaccrual L

Loans (Analysis of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	$ 60,332	$ 66,189
Unpaid Principal Balance Nonaccrual Loans	72,797	79,886
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	45,753	45,410
Unpaid Principal Balance Nonaccrual Loans	57,049	56,865
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	50
Unpaid Principal Balance Nonaccrual Loans	0	49
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	501	785
Unpaid Principal Balance Nonaccrual Loans	508	1,182
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,461	2,628
Unpaid Principal Balance Nonaccrual Loans	2,470	2,623
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	1,873	4,284
Unpaid Principal Balance Nonaccrual Loans	2,523	5,410
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	6,678	7,029
Unpaid Principal Balance Nonaccrual Loans	6,992	7,270
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	318	25
Unpaid Principal Balance Nonaccrual Loans	318	26
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	0	1,829
Unpaid Principal Balance Nonaccrual Loans	0	1,828
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment Nonaccrual Loans	2,748	4,149
Unpaid Principal Balance Nonaccrual Loans	$ 2,937	$ 4,633

Loans (Analysis of the Aged Loa

Loans (Analysis of the Aged Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 60,332	$ 66,189
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	8,332,359	8,163,583
Past Due Loans	25,690	16,215
Nonaccrual Loans	60,332	66,189
Loans Receivable, Net	8,418,381	8,245,987
Secured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	45,753	45,410
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	3,365,159	3,185,321
Past Due Loans	9,399	4,930
Nonaccrual Loans	45,753	45,410
Loans Receivable, Net	3,420,311	3,235,661
Unsecured Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	0	50
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	117,801	123,524
Past Due Loans	1,118	601
Nonaccrual Loans	0	50
Loans Receivable, Net	118,919	124,175
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	501	785
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	229,685	184,256
Past Due Loans	1,125	1,513
Nonaccrual Loans	501	785
Loans Receivable, Net	231,311	186,554
Commercial Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	2,461	2,628
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	278,777	292,680
Past Due Loans	0	673
Nonaccrual Loans	2,461	2,628
Loans Receivable, Net	281,238	295,981
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,873	4,284
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,880,405	1,898,655
Past Due Loans	5,412	3,397
Nonaccrual Loans	1,873	4,284
Loans Receivable, Net	1,887,690	1,906,336
Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	6,678	7,029
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	1,588,662	1,590,004
Past Due Loans	1,929	2,953
Nonaccrual Loans	6,678	7,029
Loans Receivable, Net	1,597,269	1,599,986
Land And Acquisition [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	318	25
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	5,320	9,882
Past Due Loans	325	0
Nonaccrual Loans	318	25
Loans Receivable, Net	5,963	9,907
Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	0	1,829
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	200,484	187,862
Past Due Loans	4,144	0
Nonaccrual Loans	0	1,829
Loans Receivable, Net	204,628	189,691
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	253,470	293,028
Past Due Loans	166	0
Nonaccrual Loans	0	0
Loans Receivable, Net	253,636	293,028
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	90,511	72,443
Past Due Loans	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	90,511	72,443
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	2,748	4,149
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	322,085	325,928
Past Due Loans	2,072	2,148
Nonaccrual Loans	2,748	4,149
Loans Receivable, Net	326,905	332,225
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	5,565	5,444
Financing Receivables, 60 to 89 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	2,258	2,400
Financing Receivables, 60 to 89 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	501
Financing Receivables, 60 to 89 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	784	402
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	2,073	971
Financing Receivables, 60 to 89 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	468
Financing Receivables, 60 to 89 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	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	166	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	284	702
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	20,125	10,190
Financing Receivables, 30 to 59 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	7,141	2,530
Financing Receivables, 30 to 59 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	1,118	100
Financing Receivables, 30 to 59 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	341	1,111
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	92
Financing Receivables, 30 to 59 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	3,339	2,426
Financing Receivables, 30 to 59 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	1,929	2,485
Financing Receivables, 30 to 59 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	325	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	4,144	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	1,788	1,446
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	581
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	581
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due Loans	$ 0	$ 0

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 8,353,691		$ 8,353,691		$ 8,176,782
Recorded Investment of Loans Individually Measured for Specific Impairment	64,690		64,690		69,205
Recorded Investment	49,865		49,865		56,357
Unpaid Principal Balance	55,431		55,431		64,735
Related Allowance	1,255		1,255		2,360
Average Recorded Investment Impaired Loans	68,528	$ 42,623	69,552	$ 33,508
Interest Recognized on Impaired Loans	314	374	813	664
Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	3,379,535		3,379,535		3,195,649
Recorded Investment of Loans Individually Measured for Specific Impairment	40,776		40,776		40,012
Recorded Investment	7,402		7,402		3,808
Unpaid Principal Balance	7,875		7,875		3,937
Related Allowance	1,139		1,139		1,867
Average Recorded Investment Impaired Loans	43,805	22,395	43,055	15,349
Interest Recognized on Impaired Loans	2	2	43	25
Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	118,897		118,897		124,150
Recorded Investment of Loans Individually Measured for Specific Impairment	22		22		25
Recorded Investment	0		0		25
Unpaid Principal Balance	0		0		24
Related Allowance	0		0		3
Average Recorded Investment Impaired Loans	444	0	234	0
Interest Recognized on Impaired Loans	0	0	1	0
One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	230,915		230,915		185,659
Recorded Investment of Loans Individually Measured for Specific Impairment	396		396		895
Recorded Investment	337		337		867
Unpaid Principal Balance	606		606		1,408
Related Allowance	8		8		103
Average Recorded Investment Impaired Loans	545	856	713	688
Interest Recognized on Impaired Loans	12	15	30	37
Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	279,008		279,008		293,694
Recorded Investment of Loans Individually Measured for Specific Impairment	2,230		2,230		2,287
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	2,246	2,549	2,407	2,026
Interest Recognized on Impaired Loans	26	0	26	0
Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,884,936		1,884,936		1,901,313
Recorded Investment of Loans Individually Measured for Specific Impairment	2,754		2,754		5,023
Recorded Investment	110		110		2,768
Unpaid Principal Balance	175		175		3,328
Related Allowance	1		1		185
Average Recorded Investment Impaired Loans	2,443	4,214	3,367	4,137
Interest Recognized on Impaired Loans	34	21	96	27
Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,587,550		1,587,550		1,591,298
Recorded Investment of Loans Individually Measured for Specific Impairment	9,719		9,719		8,688
Recorded Investment	3,274		3,274		77
Unpaid Principal Balance	4,693		4,693		80
Related Allowance	71		71		3
Average Recorded Investment Impaired Loans	9,349	4,530	8,986	4,496
Interest Recognized on Impaired Loans	124	127	333	319
Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	5,963		5,963		9,907
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	4
Interest Recognized on Impaired Loans	0	0	0	0
Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	204,628		204,628		188,481
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0		1,210
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	0	0	605	84
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	253,636		253,636		293,028
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	86,461		86,461		68,393
Recorded Investment of Loans Individually Measured for Specific Impairment	4,050		4,050		4,050
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Investment Impaired Loans	4,050	2,025	4,050	1,012
Interest Recognized on Impaired Loans	72	151	174	151
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	322,162		322,162		325,210
Recorded Investment of Loans Individually Measured for Specific Impairment	4,743		4,743		7,015
Recorded Investment	3,702		3,702		5,303
Unpaid Principal Balance	3,953		3,953		5,568
Related Allowance	36		36		199
Average Recorded Investment Impaired Loans	5,646	6,054	6,135	5,712
Interest Recognized on Impaired Loans	44	$ 58	110	$ 105
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	14,825		14,825		12,848
Unpaid Principal Balance	17,302		17,302		14,345
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	33,374		33,374		36,204
Unpaid Principal Balance	38,293		38,293		42,314
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	22		22		0
Unpaid Principal Balance	21		21		0
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	59		59		28
Unpaid Principal Balance	256		256		337
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,230		2,230		2,287
Unpaid Principal Balance	2,274		2,274		2,282
Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,644		2,644		2,255
Unpaid Principal Balance	2,789		2,789		2,601
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	6,445		6,445		8,611
Unpaid Principal Balance	6,692		6,692		10,077
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		1,210
Unpaid Principal Balance	0		0		1,210
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		4,050
Unpaid Principal Balance	4,050		4,050		4,050
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,041		1,041		1,712
Unpaid Principal Balance	$ 1,056		$ 1,056		$ 1,864

Loans Loans (Analysis of Troubl

Loans Loans (Analysis of Troubled Debt Restructurings) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)Modificationscontract	Sep. 30, 2017USD ($)Modificationscontract	Sep. 30, 2018USD ($)Modificationscontract	Sep. 30, 2017USD ($)Modificationscontract	Dec. 31, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	0	0	0
Loans and Leases Receivable, Related Parties	$ 9,700		$ 9,700		$ 10,000
Financing Receivable Modifications Additional Commitment To Lend	$ 16,200		$ 16,200		$ 506
Loans, Excluding Purchased Credit Impaired Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	4	24	28	48
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 14,634	$ 7,961	$ 21,036	$ 12,482
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 14,634	$ 7,961	$ 21,036	$ 12,482
Loans, Excluding Purchased Credit Impaired Loans [Member] | Secured Loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	1	2	9	7
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 14,511	$ 808	$ 17,605	$ 2,586
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 14,511	$ 808	$ 17,605	$ 2,586
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	0	2	0	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 201	$ 0	$ 583
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 201	$ 0	$ 583
Loans, Excluding Purchased Credit Impaired Loans [Member] | Income Property Multifamily [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	0	1	1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 1,152	$ 891	$ 1,152
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 1,152	$ 891	$ 1,152
Loans, Excluding Purchased Credit Impaired Loans [Member] | Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	0	1	0	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 78	$ 0	$ 78
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 78	$ 0	$ 78
Loans, Excluding Purchased Credit Impaired Loans [Member] | Owner Occupied Construction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	0	1	0	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 4,050	$ 0	$ 4,050
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 4,050	$ 0	$ 4,050
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | Modifications	3	17	18	35
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 123	$ 1,672	$ 2,540	$ 4,033
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 123	$ 1,672	$ 2,540	$ 4,033

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans, Analysis of Purchased Credit Impaired Loans, Accretable Yield Rollforward [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 23,175	$ 32,048	$ 23,175	$ 32,048	$ 25,350	$ 31,176	$ 35,706	$ 45,191
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	2,233	2,766	6,435	9,830
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	221	0	387	158
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	$ 279	$ (892)	$ (1,179)	$ (3,155)

Allowance for Loan and Lease _3

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (recapture) for loan and lease losses	$ 3,153	$ (648)	$ 12,980	$ 5,304

Allowance for Loan and Lease _4

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 80,150	$ 72,984	$ 75,646	$ 70,043
Charged-offs	(2,091)	(3,258)	(13,640)	(13,091)
Recoveries	2,575	2,538	8,801	9,360
Provision (recapture) for loan and lease losses	3,153	(648)	12,980	5,304
Ending balance	83,787	71,616	83,787	71,616
Specific Reserve	1,255	102	1,255	102
General Allocation	82,532	71,514	82,532	71,514
Secured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	40,350	39,539	29,341	36,050
Charged-offs	(576)	(1,362)	(8,741)	(6,071)
Recoveries	496	550	2,536	3,750
Provision (recapture) for loan and lease losses	2,912	(969)	20,046	4,029
Ending balance	43,182	37,758	43,182	37,758
Specific Reserve	1,139	0	1,139	0
General Allocation	42,043	37,758	42,043	37,758
Unsecured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,443	1,147	2,000	960
Charged-offs	(30)	0	(117)	(18)
Recoveries	51	138	356	247
Provision (recapture) for loan and lease losses	(41)	(298)	184	(202)
Ending balance	2,423	987	2,423	987
Specific Reserve	0	0	0	0
General Allocation	2,423	987	2,423	987
One-to-Four Family Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	461	628	701	599
Charged-offs	0	0	0	(460)
Recoveries	21	40	389	380
Provision (recapture) for loan and lease losses	(110)	3	(718)	152
Ending balance	372	671	372	671
Specific Reserve	8	26	8	26
General Allocation	364	645	364	645
Commercial Land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,278	2,356	4,265	1,797
Charged-offs	0	0	0	0
Recoveries	8	45	92	45
Provision (recapture) for loan and lease losses	(87)	(97)	(1,158)	462
Ending balance	3,199	2,304	3,199	2,304
Specific Reserve	0	0	0	0
General Allocation	3,199	2,304	3,199	2,304
Income Property Multifamily [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,102	6,854	5,672	7,342
Charged-offs	0	0	(223)	0
Recoveries	202	9	901	104
Provision (recapture) for loan and lease losses	(292)	241	(2,338)	(342)
Ending balance	4,012	7,104	4,012	7,104
Specific Reserve	1	25	1	25
General Allocation	4,011	7,079	4,011	7,079
Owner Occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,356	6,512	5,459	6,439
Charged-offs	0	0	0	0
Recoveries	3	4	19	114
Provision (recapture) for loan and lease losses	316	306	(803)	269
Ending balance	4,675	6,822	4,675	6,822
Specific Reserve	71	0	71	0
General Allocation	4,604	6,822	4,604	6,822
Land And Acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	848	361	963	316
Charged-offs	0	0	0	(14)
Recoveries	582	14	610	61
Provision (recapture) for loan and lease losses	(742)	(83)	(885)	(71)
Ending balance	688	292	688	292
Specific Reserve	0	0	0	0
General Allocation	688	292	688	292
Residential Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,572	1,377	3,709	669
Charged-offs	0	0	0	0
Recoveries	1	6	6	46
Provision (recapture) for loan and lease losses	660	(272)	1,518	396
Ending balance	5,233	1,111	5,233	1,111
Specific Reserve	0	0	0	0
General Allocation	5,233	1,111	5,233	1,111
Income Property Multifamily Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,367	985	7,053	404
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (recapture) for loan and lease losses	573	279	887	860
Ending balance	7,940	1,264	7,940	1,264
Specific Reserve	0	0	0	0
General Allocation	7,940	1,264	7,940	1,264
Owner Occupied Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,299	1,382	4,413	1,192
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (recapture) for loan and lease losses	138	(87)	(1,976)	103
Ending balance	2,437	1,295	2,437	1,295
Specific Reserve	0	0	0	0
General Allocation	2,437	1,295	2,437	1,295
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,292	3,551	5,163	3,534
Charged-offs	(277)	(263)	(773)	(1,156)
Recoveries	266	343	796	876
Provision (recapture) for loan and lease losses	(258)	42	(163)	419
Ending balance	5,023	3,673	5,023	3,673
Specific Reserve	36	51	36	51
General Allocation	4,987	3,622	4,987	3,622
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,782	8,061	6,907	10,515
Charged-offs	(1,208)	(1,633)	(3,786)	(5,372)
Recoveries	945	1,389	3,096	3,737
Provision (recapture) for loan and lease losses	(502)	(473)	(2,200)	(1,536)
Ending balance	4,017	7,344	4,017	7,344
Specific Reserve	0	0	0	0
General Allocation	4,017	7,344	4,017	7,344
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	231	0	226
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (recapture) for loan and lease losses	586	760	586	765
Ending balance	586	991	586	991
Specific Reserve	0	0	0	0
General Allocation	$ 586	$ 991	$ 586	$ 991

Allowance for Loan and Lease _5

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit
Beginning balance	$ 3,680	$ 3,555	$ 3,130	$ 2,705
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	275	(75)	825	775
Ending balance	$ 3,955	$ 3,480	$ 3,955	$ 3,480

Allowance for Loan and Lease _6

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, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	$ 83,787	$ 80,150	$ 75,646	$ 71,616	$ 72,984	$ 70,043
Loans, net	8,430,530		8,283,011
Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,418,381		8,245,987
Less: allowance for loan and lease losses	79,770		68,739
Loans, net	8,338,611		8,177,248
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	102,781		120,758
Acquisition Accounting Valuation Discount on Purchased Credit Impaired Loans	6,845		8,088
Less: allowance for loan and lease losses	4,017		6,907
Loans, net	91,919		105,763
Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,085,970		7,926,539
Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	98,991		117,307
Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	134,098		95,551
Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		349
Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	198,313		223,897
Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,790		3,102
Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	43,182	40,350	29,341	37,758	39,539	36,050
Secured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,420,311		3,235,661
Secured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,679		12,641
Secured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,202,147		3,049,031
Secured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	9,732		11,918
Secured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	83,986		64,600
Secured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	134,178		122,030
Secured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	947		723
Secured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	2,423	2,443	2,000	987	1,147	960
Unsecured Loans [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	118,919		124,175
Unsecured Loans [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	924		1,112
Unsecured Loans [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	118,885		123,621
Unsecured Loans [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	824		1,045
Unsecured Loans [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	33		0
Unsecured Loans [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1		554
Unsecured Loans [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	100		67
Unsecured Loans [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	372	461	701	671	628	599
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	231,311		186,554
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,243		14,610
One-to-Four Family Residential [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	229,704		183,312
One-to-Four Family Residential [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,021		13,817
One-to-Four Family Residential [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		1,186
One-to-Four Family Residential [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,607		2,056
One-to-Four Family Residential [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	222		793
One-to-Four Family Residential [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	3,199	3,278	4,265	2,304	2,356	1,797
Commercial Land [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	281,238		295,981
Commercial Land [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,583		9,809
Commercial Land [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	272,838		283,673
Commercial Land [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,583		9,460
Commercial Land [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,423		5,204
Commercial Land [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		349
Commercial Land [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,977		7,104
Commercial Land [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	4,012	4,102	5,672	7,104	6,854	7,342
Income Property Multifamily [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,887,690		1,906,336
Income Property Multifamily [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	22,342		26,016
Income Property Multifamily [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,857,338		1,857,832
Income Property Multifamily [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	20,444		25,981
Income Property Multifamily [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	19,474		17,181
Income Property Multifamily [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,878		31,323
Income Property Multifamily [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,898		35
Income Property Multifamily [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	4,675	4,356	5,459	6,822	6,512	6,439
Owner Occupied [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,597,269		1,599,986
Owner Occupied [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	37,419		43,386
Owner Occupied [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,532,093		1,546,775
Owner Occupied [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	37,042		42,617
Owner Occupied [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	27,182		7,380
Owner Occupied [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	37,994		45,831
Owner Occupied [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	377		769
Owner Occupied [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	688	848	963	292	361	316
Land And Acquisition [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,963		9,907
Land And Acquisition [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	159		177
Land And Acquisition [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,645		9,882
Land And Acquisition [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	155		169
Land And Acquisition [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	318		25
Land And Acquisition [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4		8
Land And Acquisition [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	5,233	4,572	3,709	1,111	1,377	669
Residential Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	204,628		189,691
Residential Construction [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] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	204,628		187,863
Residential Construction [Member] | Pass [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] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Residential Construction [Member] | 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
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	0		1,828
Residential 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
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] | Doubtful [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] | 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
Residential 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
Income Property Multifamily Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan and lease losses	7,940	7,367	7,053	1,264	985	404
Income Property Multifamily Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	253,636		293,028
Income Property Multifamily Construction [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	552		595
Income Property Multifamily Construction [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	253,636		293,028
Income Property Multifamily Construction [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	552		595
Income Property Multifamily Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily Construction [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily Construction [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	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	2,437	2,299	4,413	1,295	1,382	1,192
Owner Occupied Construction [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	90,511		72,443
Owner Occupied Construction [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] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	86,461		68,393
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	0		0
Owner Occupied Construction [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied Construction [Member] | 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		4,050
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	5,023	$ 5,292	5,163	$ 3,673	$ 3,551	$ 3,534
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	326,905		332,225
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	9,880		12,412
Consumer Portfolio Segment [Member] | Pass [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	322,595		323,129
Consumer Portfolio Segment [Member] | Pass [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	9,638		11,705
Consumer Portfolio Segment [Member] | Special Mention [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Special Mention [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Substandard [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,310		9,096
Consumer Portfolio Segment [Member] | Substandard [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	242		707
Consumer Portfolio Segment [Member] | Doubtful [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Doubtful [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 0		$ 0

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 7,080	$ 4,058	$ 13,298	$ 5,998
Transfers in	794	74	1,200	74
Valuation adjustments	(495)	(138)	(697)	(364)
Proceeds from Sale of OREO Property	47	182	5,868	1,901
Loss on sale of OREO, net	(1)	(130)	(602)	(125)
Total OREO, end of period	7,331	$ 3,682	7,331	$ 3,682
Mortgage Loans in Process of Foreclosure, Amount	736		736
One-to-Four Family Residential [Member]
Other Real Estate Owned [Line Items]
Total OREO, end of period	$ 60		$ 60

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets [Roll Forward]
Total goodwill, beginning of period				$ 765,842
Total goodwill, end of period	$ 765,842	[1]	$ 382,762	765,842	[1]	$ 382,762
CDI current period amortization	(3,070)		(1,188)	(9,346)		(3,786)
Indefinite-lived Intangible Assets (Excluding Goodwill)	919		919	919		919
Other intangible assets, net	48,827		13,845	48,827		13,845		$ 58,173
Total goodwill and intangible assets, end of period	814,669		396,607	$ 814,669		396,607
Core Deposits [Member]
Goodwill and Intangible Assets [Line Items]
Estimated life of CDI, in years				10 years
Goodwill and Intangible Assets [Roll Forward]
Gross core deposit intangible balance, beginning of period							$ 105,473	105,473	$ 58,598	$ 58,598
Accumulated amortization at beginning of period							$ (54,495)	$ (48,219)	$ (44,484)	$ (41,886)
Core deposit intangible, net, beginning of period	50,978		14,114	$ 57,254		16,712
CDI current period amortization	(3,070)		(1,188)	(9,346)		(3,786)
Total core deposit intangible, end of period	$ 47,908		$ 12,926	$ 47,908		$ 12,926
[1]	See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) $ in Thousands	Sep. 30, 2018USD ($)
Future Amortization Expense For Core Deposit Intangibles
2,018	$ 2,890
2,019	10,479
2,020	8,724
2,021	7,264
2,022	$ 5,880

Subordinated debentures (Detail

Subordinated debentures (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Nov. 01, 2017
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Interest Rate	5.875%
Debt Instrument, Interest Rate Terms	471.5
Pacific Continental [Member]
Subordinated Borrowing [Line Items]
Business Combination, Purchase Price Allocation, Subordinated Debt		$ 35

Junior subordinated debt (Detai

Junior subordinated debt (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Nov. 01, 2017
junior subordinated debentures [Line Items]
Junior Subordinated Notes	$ 0		$ 8,248
Repayments of junior subordinated debt	$ 8,248	$ 0	$ 6,200
Pacific Continental [Member]
junior subordinated debentures [Line Items]
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures				$ 14,434

Derivatives and Balance Sheet_3

Derivatives and Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 1	$ 6	$ 9	$ 12
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	62,197		62,197
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	62,197		62,197
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	62,197		62,197
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	0		0
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative, Notional Amount	368,100		368,100		$ 384,700
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of asset derivative instruments	10,479		10,479		6,707
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Fair value of liability derivative instruments	$ 10,478		$ 10,478		$ 6,714

Derivatives and Balance Sheet_4

Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 62,197
Repurchase agreements, amounts offset in balance sheet	0	$ 0
Repurchase agreements, net amount presented in statement of financial position	62,197	79,059
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(62,197)	(79,059)
Securities sold under agreements to repurchase, amount not offset	0	0
Interest Rate Contracts [Member]
Balance Sheet Offsetting [Line Items]
Derivative Assets, Gross Amounts Offset in the Balance Sheets	0	0
Derivative Asset	10,479	6,707
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	10,479	6,707
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	10,478	6,714
Derivative, Collateral, Right to Reclaim Securities	(9,595)	(6,714)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	883	0
Available-for-sale Securities [Member]
Balance Sheet Offsetting [Line Items]
Securities Sold under Agreements to Repurchase, Gross	62,197	79,059
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Assets [Member]
Balance Sheet Offsetting [Line Items]
Fair value of asset derivative instruments	10,479	6,707
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Balance Sheet Offsetting [Line Items]
Fair value of liability derivative instruments	10,478	$ 6,714
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	62,197
Maturity Overnight [Member] | U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Balance Sheet Offsetting [Line Items]
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement	$ 62,197

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 2,500,000	$ 2,620,000
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	41,800	51,300
Commercial Letter of Credit and other off-balance sheet liabilities [Member]
Other Commitments [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 104	$ 159

Shareholders' Equity (Details)

Shareholders' Equity (Details) - $ / shares	Oct. 25, 2018	Jul. 25, 2018	Apr. 25, 2018	Jan. 25, 2018
Subsequent Event [Line Items]
Declared quarterly cash dividend		$ 0.26	$ 0.26	$ 0.22
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Special Cash Dividends, Per Share, Declared	$ 0.14
Declared quarterly cash dividend	$ 0.26

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (55,921)	$ (6,528)	$ (22,225)	$ (18,999)
Other comprehensive loss before reclassifications	[1]	(14,149)	549	(48,043)	12,888
Amounts reclassified from accumulated other comprehensive loss	[1]	61	46	102	178
Net current-period other comprehensive income (loss)	[1]	(14,088)	595	(47,941)	13,066
Ending balance		(70,009)	(5,933)	(70,009)	(5,933)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(53,597)	(4,969)	(19,779)	(12,704)
Other comprehensive loss before reclassifications	[1]	(14,149)	549	(48,043)	8,284
Amounts reclassified from accumulated other comprehensive loss	[1]	0	0	(81)	0
Net current-period other comprehensive income (loss)	[1]	(14,149)	549	(48,124)	8,284
Ending balance		(67,746)	(4,420)	(67,746)	(4,420)
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(2,324)	(1,559)	(2,446)	(6,295)
Other comprehensive loss before reclassifications	[1]	0	0	0	4,604
Amounts reclassified from accumulated other comprehensive loss	[1]	61	46	183	178
Net current-period other comprehensive income (loss)	[1]	61	46	183	4,782
Ending balance		$ (2,263)	$ (1,513)	$ (2,263)	$ (1,513)
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 0
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						157
Accounting Standards Update 2016-01 [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						0
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 157
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains, net			$ (73)	$ 0
Compensation and employee benefits	$ 49,419	$ 39,983	148,938	119,201
Total before tax	57,821	59,107	156,354	137,132
Income tax provision	(11,406)	(18,338)	(28,220)	(40,032)
Net income	46,415	40,769	128,134	97,100
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	0	106	0
Total before tax	0	0	106	0
Income tax provision	0	0	(25)	0
Net income	0	0	81	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Compensation and employee benefits	(80)	(72)	(239)	(279)
Total before tax	(80)	(72)	(239)	(279)
Income tax provision	19	26	56	101
Net income	$ (61)	$ (46)	$ (183)	$ (178)

Fair Value Accounting and Mea_3

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, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	$ 4,901	$ 5,080
Fair Value, Level 2 to level 1 Transfers, Amount	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 2,921,114	2,737,751
Equity Securities, FV-NI	4,901	5,080
Other assets (Interest rate contracts)	10,479	6,707
Other liabilities (Interest rate contracts)	10,478	6,714
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
Equity Securities, FV-NI	4,901	5,080
Other assets (Interest rate contracts)	0	0
Other liabilities (Interest rate contracts)	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,920,867	2,737,503
Equity Securities, FV-NI	0	0
Other assets (Interest rate contracts)	10,479	6,707
Other liabilities (Interest rate contracts)	10,478	6,714
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Equity Securities, FV-NI	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	1,928,832	1,726,725
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,928,832	1,726,725
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
State and Municipal Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	567,818	596,004
State and Municipal Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
State and Municipal Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	567,818	596,004
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	424,217	414,774
U.S. Government Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
U.S. Government Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	424,217	414,774
U.S. Government Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
US Government Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
US Government Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	247	248
US Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
US Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

Fair Value Accounting and Mea_4

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 14,616	$ 843	$ 14,616	$ 843
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1,653	308	1,653	308
Other Real Estate Owned, Fair Value Disclosure	1,240	625	1,240	625
Assets, Fair Value Disclosure	15,856	1,468	15,856	1,468
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
Other Real Estate Owned, Fair Value Disclosure	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
Other Real Estate Owned, Fair Value Disclosure	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	14,616	843	14,616	843
Other Real Estate Owned, Fair Value Disclosure	1,240	625	1,240	625
Assets, Fair Value Disclosure	15,856	1,468	15,856	1,468
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)	1,208	170	1,208	170
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)	$ 445	$ 138	$ 445	$ 138

Fair Value Accounting and Mea_5

Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Fair Value, Measurements, Nonrecurring [Member] $ in Thousands	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired loans	$ 14,616	$ 843
Other Real Estate Owned, Fair Value Disclosure	1,240	625
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired loans	14,616	843
Other Real Estate Owned, Fair Value Disclosure	1,240	625
Collateral Pledged [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired loans	$ 14,616	715
Collateral Pledged [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input	0
Collateral Pledged [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input	0.5451
Collateral Pledged [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input	0.0666
Uncollateralized [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired loans		$ 128
Uncollateralized [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input		0
Uncollateralized [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input		0
Uncollateralized [Member] | Valuation, Market Approach [Member] | Impaired Loans [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Impaired Loans, Measurement Input		0.0775

Fair Value Accounting and Mea_6

Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Interest-earning deposits with banks	$ 21,456	$ 97,918
Debt Securities, Available-for-sale	2,921,114	2,737,751
Equity Securities, FV-NI	4,901	5,080
Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	220,706	244,615
Interest-earning deposits with banks	21,456	97,918
Debt Securities, Available-for-sale	2,921,114	2,737,751
Equity Securities, FV-NI	4,901	5,080
FHLB stock	16,640	10,440
Loans held for sale	5,275	5,766
Loans	8,425,433	8,055,817
Interest rate contracts	10,479	6,707
Liabilities
Deposits	423,165	483,095
FHLB Advances	166,999	12,281
Repurchase agreements	62,197	79,070
Interest rate contracts	10,478	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,001	35,895
Junior subordinated debentures, fair value disclosure		8,248
Reported Value Measurement [Member]
Assets
Cash and due from banks	220,706	244,615
Interest-earning deposits with banks	21,456	97,918
Debt Securities, Available-for-sale	2,921,114	2,737,751
Equity Securities, FV-NI	4,901	5,080
FHLB stock	16,640	10,440
Loans held for sale	5,275	5,766
Loans	8,430,530	8,283,011
Interest rate contracts	10,479	6,707
Liabilities
Deposits	431,496	491,045
FHLB Advances	166,536	11,579
Repurchase agreements	62,197	79,059
Interest rate contracts	10,478	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,508	35,647
Junior subordinated debentures, fair value disclosure		8,248
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	220,706	244,615
Interest-earning deposits with banks	21,456	97,918
Debt Securities, Available-for-sale	247	248
Equity Securities, FV-NI	4,901	5,080
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
Interest rate contracts	0	0
Liabilities
Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Subordinated Debt Obligations, Fair Value Disclosure	0	0
Junior subordinated debentures, fair value disclosure		0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	2,920,867	2,737,503
Equity Securities, FV-NI	0	0
FHLB stock	16,640	10,440
Loans held for sale	5,275	5,766
Loans	0	0
Interest rate contracts	10,479	6,707
Liabilities
Deposits	423,165	483,095
FHLB Advances	166,999	12,281
Repurchase agreements	62,197	79,070
Interest rate contracts	10,478	6,714
Subordinated Debt Obligations, Fair Value Disclosure	35,001	35,895
Junior subordinated debentures, fair value disclosure		8,248
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Assets
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Debt Securities, Available-for-sale	0	0
Equity Securities, FV-NI	0	0
FHLB stock	0	0
Loans held for sale	0	0
Loans	8,425,433	8,055,817
Interest rate contracts	0	0
Liabilities
Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Subordinated Debt Obligations, Fair Value Disclosure	$ 0	0
Junior subordinated debentures, fair value disclosure		$ 0

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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net Income	$ 46,415	$ 40,769	$ 128,134	$ 97,100
Earnings allocated to participating securities - preferred shares	0	0	0	4
Earnings allocated to participating securities - nonvested restricted shares	504	558	1,413	1,325
Earnings allocated to common shareholders, Basic	$ 45,911	$ 40,211	$ 126,721	$ 95,771
Weighted average common shares outstanding	72,427	57,566	72,370	57,459
Basic earnings per common share	$ 0.63	$ 0.70	$ 1.75	$ 1.67
Earnings allocated to common shareholders, Diluted	$ 45,911	$ 40,211	$ 126,721	$ 95,771
Dilutive effect of equity awards and warrants	5	5	4	6
Weighted average diluted common shares outstanding	72,432	57,571	72,374	57,465
Diluted earnings per common share	$ 0.63	$ 0.70	$ 1.75	$ 1.67
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	0	12	5	13

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from Contract with Customer [Abstract]
Deposit account and treasury management fees	$ 9,266	$ 7,685	$ 26,689	$ 22,368
Card revenue	3,714	6,735	16,143	18,660
Financial services and trust revenue	2,975	2,645	8,924	8,520
Loan revenue	3,282	3,154	9,522	9,736
Revenue from contracts with customers	15,955		51,756
Noninterest income, excluding revenue from contracts with customers	5,064		16,098
Noninterest Income	$ 21,019	$ 37,067	$ 67,854	$ 86,061