Columbia Banking System (COLB) 10-Q 6 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Entity Registrant Name	'COLUMBIA BANKING SYSTEM INC	'
Entity Central Index Key	'0000887343	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	52,651,886

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'		'
Cash and due from banks	$193,816		$165,030
Interest-earning deposits with banks	30,646		14,531
Total cash and cash equivalents	224,462		179,561
Securities available for sale at fair value (amortized cost of $1,581,989 and $1,680,491, respectively)	1,590,017		1,664,111
Federal Home Loan Bank stock at cost	31,912		32,529
Loans held for sale	750		735
Loans, net	4,645,280		4,444,842
FDIC loss sharing asset	27,981		39,846
Interest receivable	22,183		22,206
Premises and equipment, net	156,645		154,732
Other real estate owned ($13,051 and $12,093 covered by FDIC loss share, respectively)	28,254		35,927
Goodwill	343,952		343,952
Intangible Assets, Net (Excluding Goodwill)	22,792		25,852
Other assets	203,230		217,289
Total Assets	7,297,458		7,161,582
LIABILITIES AND SHAREHOLDERS' EQUITY	'		'
Noninterest-bearing	2,190,161		2,171,703
Interest-bearing	3,794,908		3,787,772
Total deposits	5,985,069		5,959,475
Federal Home Loan Bank advances	110,587		36,606
Securities sold under agreements to repurchase	25,000		25,000
Other liabilities	84,651		87,252
Total liabilities	6,205,307		6,108,333
Commitments and contingent liabilities	'		'
Shareholders' equity:	'		'
Preferred Stock, Shares Authorized	2,000		2,000
Preferred Stock, Shares Issued	9		9
Preferred Stock, Value, Issued	2,217		2,217
Authorized shares	63,033		63,033
Common Stock Shares Issued And Outstanding	52,635		51,265
Common Stock (no par value)	861,609		860,562
Retained earnings	224,765		202,514
Accumulated other comprehensive income	3,560	[1]	-12,044	[1]
Total shareholders' equity	1,092,151		1,053,249
Total Liabilities and Shareholders' Equity	7,297,458		7,161,582
Noncovered Loans [Member]	'		'
ASSETS	'		'
Loans held for sale	750		735
Loans, excluding covered loans, net of unearned income of ($57,126) and ($68,282), respectively	4,452,674		4,219,451
Loans and Leases Receivable, Allowance	49,494		52,280
Loans, net	4,403,180		4,167,171
Other real estate owned ($13,051 and $12,093 covered by FDIC loss share, respectively)	15,203		23,834
Covered Loans [Member]	'		'
ASSETS	'		'
Loans and Leases Receivable, Allowance	19,801		20,174
Loans, net	242,100		277,671
Other real estate owned ($13,051 and $12,093 covered by FDIC loss share, respectively)	$13,051		$12,093
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Securities available-for-sale, amortized cost	$1,581,989	$1,680,491
Less: Unearned income on loans	-57,126	-68,282
Other real estate owned covered by FDIC loss share	28,254	35,927
Common stock, par value	$0	$0
Common stock, shares authorized	63,033	63,033
Common stock, shares outstanding	52,635	51,265
Covered Loans [Member]	'	'
Allowance for losses on covered loans	-19,801	-20,174
Other real estate owned covered by FDIC loss share	$13,051	$12,093

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Net of tax	$21,227		$14,591		$41,071		$26,767
Unrealized gain from securities:	'		'		'		'
Net unrealized holding loss from available for sale securities arising during the period	8,768		-25,930		15,887		-28,423
Reclassification adjustment of net gain from sale of available for sale securities included in income	-189		-59		-331		-299
Net unrealized gain from securities, net of reclassification adjustment	8,579		-25,989		15,556		-28,722
Pension plan liability adjustment:	'		'		'		'
Unrecognized net actuarial gain (loss) during the period	'		'		0		-756
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost	24		60		48		119
Pension plan liability adjustment, net	24		60		48		-637
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8,603	[1]	-25,929	[1]	15,604	[1]	-29,359	[1]
Total comprehensive income	$29,830		($11,338)		$56,675		($2,592)
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest Income	'	'	'	'
Loans	$67,004	$74,837	$132,545	$122,865
Taxable securities	6,382	4,890	13,134	9,124
Tax-exempt securities	2,671	2,508	5,289	4,806
Federal funds sold and deposits in banks	30	33	44	234
Total interest income	76,087	82,268	151,012	137,029
Interest Expense	'	'	'	'
Deposits	729	1,054	1,481	2,143
Federal Home Loan Bank advances	115	-699	229	-628
Prepayment charge on Federal Home Loan Bank advances	0	1,548	0	1,548
Other borrowings	119	376	238	495
Total interest expense	963	2,279	1,948	3,558
Net Interest Income	75,124	79,989	149,064	133,471
Provision for loan and lease losses	'	'	4,039	268
Net interest income after provision for loan and lease losses	73,007	79,701	145,025	133,203
Noninterest Income (Loss)	'	'	'	'
Service charges and other fees	13,790	13,560	26,726	21,154
Merchant services fees	2,040	2,013	3,910	3,864
Investment securities gains, net	296	92	519	462
Bank owned life insurance	976	1,008	1,941	1,706
Change in FDIC loss sharing asset	-5,050	-13,137	-9,869	-23,620
Other	2,575	3,272	5,408	4,900
Total noninterest income (loss)	14,627	6,808	28,635	8,466
Noninterest Expense	'	'	'	'
Compensation and employee benefits	31,064	35,657	62,402	57,310
Occupancy	8,587	7,543	16,831	12,296
Merchant processing	998	852	1,978	1,709
Advertising and promotion	950	1,160	1,719	2,030
Data processing and communications	3,680	3,638	7,200	6,218
Legal and professional fees	2,303	5,504	4,472	7,554
Taxes, licenses and fees	1,051	1,204	2,231	2,591
Regulatory premiums	1,073	1,177	2,249	2,034
Net cost (benefit) of operation of other real estate owned	-97	-2,828	49	-5,329
Amortization of intangibles	1,480	1,693	3,060	2,722
Other	6,675	8,904	12,959	13,418
Total noninterest expense	57,764	64,504	115,150	102,553
Income before income taxes	29,870	22,005	58,510	39,116
Income tax provision	8,643	7,414	17,439	12,349
Net Income	21,227	14,591	41,071	26,767
Earnings per common share	'	'	'	'
Basic ($ per share)	$0.40	$0.28	$0.79	$0.59
Diluted ($ per share)	$0.40	$0.28	$0.77	$0.58
Dividends paid per common share	$0.24	$0.10	$0.36	$0.20
Weighted average number of common shares outstanding	52,088	50,788	51,600	45,099
Weighted average number of diluted common shares outstanding	52,494	52,125	52,463	45,758
Noncovered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	600	2,000	100	1,000
Covered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	$1,517	($1,712)	$3,939	($732)

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	($4,992)	$14,116	($9,041)	$15,473
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	107	33	188	163
Net unrealized gain from unfunded defined benefit plan liability arising during the period, tax	0	0	0	412
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	($13)	($32)	($26)	($65)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Preferred Stock [Member]
In Thousands
Balance, value at Dec. 31, 2012	$764,008	$581,471	$162,388	$20,149	$0
Balance, shares at Dec. 31, 2012	'	39,686	'	'	0
Net Income	26,767	'	26,767	'	'
Other comprehensive income	-29,359	'	'	-29,359	'
Issuance of common stock - stock option and other plans, value	774	774	'	'	'
Issuance of common stock - stock option and other plans, shares	'	43	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,280	1,280	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, shares	'	144	'	'	'
Stock Repurchased During Period, Shares	'	-16	'	'	'
Stock Repurchased and Retired During Period, Value	-391	-391	'	'	'
Dividends, Preferred Stock, Cash	-10	'	'	'	'
Cash dividends paid on common stock	9,093	'	9,093	'	'
Balance, value at Jun. 30, 2013	1,030,674	857,615	180,052	-9,210	2,217
Balance, shares at Jun. 30, 2013	'	51,237	'	'	9
Balance, value at Dec. 31, 2013	1,053,249	860,562	202,514	-12,044	2,217
Balance, shares at Dec. 31, 2013	'	51,265	'	'	9
Stock Adjustment Value Deferred Compensation	-1	'	'	'	'
Net Income	41,071	'	41,071	'	'
Other comprehensive income	15,604	'	'	15,604	'
Issuance of common stock - cashless exercise of warrants, shares	'	1,140	'	'	'
Issuance of common stock - cashless exercise of warrants, value	0	0	'	'	'
Stock Adjustment Deferred Compensation - Shares	0	'	'	'	'
Issuance of common stock - stock option and other plans, value	425	425	'	'	'
Issuance of common stock - stock option and other plans, shares	'	21	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,224	1,224	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, shares	'	233	'	'	'
Stock Repurchased During Period, Shares	'	-24	'	'	'
Stock Repurchased and Retired During Period, Value	-601	-601	'	'	'
Dividends, Preferred Stock, Cash	-37	'	'	'	'
Cash dividends paid on common stock	18,783	'	18,783	'	'
Balance, value at Jun. 30, 2014	$1,092,151	$861,609	$224,765	$3,560	$2,217
Balance, shares at Jun. 30, 2014	'	52,635	'	'	9

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Payments for (Proceeds from) Other Investing Activities	$0	$1,026
Payments to Acquire Businesses, Net of Cash Acquired	0	-154,170
Payments to Acquire Intangible Assets	0	913
Cash Flows From Operating Activities	'	'
Net Income	41,071	26,767
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for loan and lease losses and losses on covered loans	4,039	268
Stock-based compensation expense	1,224	1,280
Depreciation, amortization and accretion	17,057	22,527
Net realized gain on sale of securities	519	462
Net realized gain on sale of other assets	453	-73
Net realized (gain) loss on sale of other real estate owned	-2,972	-6,291
Write-down on other real estate owned	2,554	664
Net change in:	'	'
Loans held for sale	-15	413
Interest receivable	23	-8,850
Interest payable	-20	-12
Other assets	3,062	6,285
Other liabilities	-2,589	-12,662
Net cash provided by operating activities	63,368	29,854
Cash Flows From Investing Activities	'	'
Loans originated and acquired, net of principal collected	201,162	194,322
Purchases of securities available for sale	-22,804	-162,018
Purchases of premises and equipment	-8,383	-8,071
Proceeds from FDIC reimbursement on loss-sharing asset	3,982	6,387
Proceeds from sales of securities available for sale	30,704	166,881
Proceeds from principal repayments and maturities of securities available for sale	83,788	167,736
Proceeds from Sales of Assets, Investing Activities	1,095	806
Proceeds from sales of covered other real estate owned	5,634	13,814
Proceeds from sales of other real estate and other personal property owned	10,298	6,076
Payment to FDIC Related to Loss-Sharing Asset	-2,217	0
Net cash provided by (used in) investing activities	-99,065	-158,820
Cash Flows From Financing Activities	'	'
Net increase (decrease) in deposits	25,594	-177,631
Proceeds from Federal Home Loan Bank advances	1,168,000	756,100
Proceeds from Federal Reserve Bank borrowings	50	50
Proceeds from exercise of stock options	425	774
Repayment of Federal Home Loan Bank advances	-1,094,000	-711,000
Repayment of Federal Reserve Bank borrowings	-50	-50
Payment of common stock dividends	-18,783	-9,093
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-37	-10
Repayments of Subordinated Debt	0	51,000
Purchase and retirement of common stock	601	391
Net cash used by financing activities	80,598	-192,251
Increase (Decrease) in cash and cash equivalents	44,901	-321,217
Cash and cash equivalents at beginning of period	179,561	513,926
Cash and cash equivalents at end of period	224,462	192,709
Supplemental Information:	'	'
Cash paid for interest	1,968	2,155
Cash paid for income tax	8,200	9,589
Non-cash investing and financing activities	'	'
Loans transferred to other real estate owned	7,841	9,307
Stock Issued	$0	$276,181

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Basis of Presentation And Significant Accounting Policies	'
Basis of Presentation and Significant Accounting Policies	'
	Basis of Presentation and Significant Accounting Policies
	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 West Coast Trust Company, Inc. (“West Coast 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 six months ended June 30, 2014 are not necessarily indicative of results to be anticipated for the year ending December 31, 2014. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2013 Annual Report on Form 10-K.
	Due to the timing of the acquisition of West Coast Bancorp (“West Coast”), our results of operations for the six month period ended June 30, 2014 include the acquisition for the full six month period, however the prior year period only includes the acquisition for three months of the six month period. See Note 3, Business Combinations, for further information regarding this acquisition.
	Significant Accounting Policies
	The significant accounting policies used in preparation of our consolidated financial statements are disclosed in our 2013 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2013 Form 10-K disclosure for the year ended December 31, 2013.

Accounting_Pronouncements_Rece

Accounting Pronouncements Recently Issued	6 Months Ended
	Jun. 30, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Accounting Pronouncements Recently Issued	'
	Accounting Pronouncements Recently Issued
	In June 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Services Period. The amendments in ASU 2014-12 provide guidance for determining compensation cost under specific circumstances when an employee is eligible to vest in an award regardless of whether the employee is rendering service on the date the performance target is achieved. ASU 2014-12 becomes effective for annual and interim periods beginning after December 15, 2015 with early adoption permitted. As of June 30, 2014, the Company did not have any share-based payment awards that include performance targets that could be achieved after the requisite service period. As such, the adoption of ASU No. 2014-12 is not expected to have a material impact on the Company’s consolidated financial statements.
	In June 2014, the FASB issued ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in ASU 2014-11 change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with accounting for other repurchase agreements. Additionally, the amendment requires new disclosures on transfers accounted for as sales in transactions that are economically similar to repurchase agreements and requires increased transparency on collateral pledged in secured borrowings. The amendments in this update will be effective for the first interim or annual period beginning after December 31, 2014, with the exception of the collateral disclosures which will be effective for interim periods beginning after March 15, 2015. Early application is not permitted. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-04 No. 2014-09, Revenue from Contracts with Customers. The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the codification. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements.
	In April 2014, the the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. It is effective for annual periods beginning on or after December 15, 2014. Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company is assessing the impact of the new guidance on its consolidated financial statements.
	In January 2014, the FASB issued ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure. The Update clarifies when a creditor would be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that all or a portion of the loan would be derecognized and the real estate property recognized. Under the guidance, a consumer loan collateralized by residential real estate should be reclassified to other real estate owned when (1) the creditor obtains legal title to the residential property or (2) the borrower conveys all interest in the property to the creditor to satisfy the loan by completing a deed in lieu of foreclosure or similar agreement. In addition, an entity is required to disclose the amount of residential real estate meeting the conditions above, and the recorded investment in consumer mortgage loans secured by residential real estate that are in the process of foreclosure. ASU 2014-04 is effective for annual and interim reporting periods within those annual periods, beginning after December 15, 2014. Adoption of the new guidance is not expected to have a significant impact on the Company’s consolidated financial statements.
	In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The Update provides guidance on accounting for investments by a reporting entity in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for the low-income housing tax credit. The amendments in this Update permit the reporting entity to make an accounting policy election to account for its investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the cost of the investment is amortized each reporting period in proportion to the tax credits received. Under the new guidance, classification of the amortization would change from noninterest expense to income tax expense. ASU 2014-01 is effective for annual and interim reporting periods within those annual periods, beginning after December 15, 2014. The guidance is to be applied retrospectively to all periods presented. The Company is assessing the impact of the new guidance on its consolidated financial statements.

Business_combinations

Business combinations	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Combination Disclosure [Text Block]	'
	Business Combinations
	On April 1, 2013, the Company completed its acquisition of West Coast. The Company paid $540.8 million in total consideration to acquire 100% of the voting equity interests of West Coast. The primary reason for the acquisition was to expand the Company’s geographic footprint consistent with its ongoing growth strategy. The fair value of the net assets acquired totaled $312.4 million, including $1.88 billion of deposits, $1.41 billion of loans and $15.3 million of other intangible assets. Goodwill of $228.4 million was recorded as part of the acquisition. The goodwill is not deductible for income tax purposes.
	The operating results of the Company include the operating results produced by the acquired assets and assumed liabilities for the period April 1, 2013 to June 30, 2014. Disclosure of the amount of West Coast’s revenue and net income (excluding integration costs) included in Columbia’s consolidated income statement is impracticable due to the integration of the operations and accounting for this acquisition.
	The following table presents certain unaudited pro forma information for the six month period ended June 30, 2013, for illustrative purposes only. This unaudited pro forma information was calculated as if West Coast had been acquired as of the beginning of the year prior to the acquisition. The unaudited estimated pro forma information combines the historical results of West Coast 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 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
		Six Months Ended June 30,
		2013
		(in thousands)
	Total revenues (net interest income plus noninterest income)	$	177,970
	Net income	$	43,256
	Earnings per share - basic	$	0.85
	Earnings per share - diluted	$	0.83
	In connection with the West Coast acquisition, Columbia recognized $672 thousand and $9.2 million of acquisition-related expenses for the three month periods ended June 30, 2014 and 2013, respectively, and $1.6 million and $10.0 million for the six month periods ended June 30, 2014 and 2013, respectively.
	See Note 2, Business Combinations, in Item 8 of our 2013 Form 10-K for additional details related to the West Coast acquisition.

Securities

Securities	6 Months Ended
	Jun. 30, 2014
Available-for-sale Securities [Abstract]	'
Securities	'
	Securities
	The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:
		Amortized		Gross			Gross			Fair Value
		Cost		Unrealized			Unrealized
				Gains			Losses
		(in thousands)
	June 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	862,248	$	11,858		$	(11,488	)	$	862,618
	State and municipal securities	368,221		13,783			(1,498		)	380,506
	U.S. government agency and government-sponsored enterprise securities	325,341		492			(4,444		)	321,389
	U.S. government securities	20,895		1			(559		)	20,337
	Other securities	5,284		22			(139		)	5,167
	Total	$	1,581,989	$	26,156		$	(18,128	)	$	1,590,017
	December 31, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	961,442	$	10,640		$	(23,674	)	$	948,408
	State and municipal securities	357,013		11,450			(3,993		)	364,470
	U.S. government agency and government-sponsored enterprise securities	335,671		434			(10,066		)	326,039
	U.S. government securities	21,081		—			(967		)	20,114
	Other securities	5,284		27			(231		)	5,080
	Total	$	1,680,491	$	22,551		$	(38,931	)	$	1,664,111
	The scheduled contractual maturities of investment securities available for sale at June 30, 2014 are presented as follows:
		June 30, 2014
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	21,359	$	21,470
	Due after one year through five years	332,516		333,068
	Due after five years through ten years	431,423		432,434
	Due after ten years	791,407		797,878
	Other securities with no stated maturity	5,284		5,167
	Total investment securities available-for-sale	$	1,581,989	$	1,590,017
	The following table summarizes, as of June 30, 2014, the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		Carrying Amount
		(in thousands)
	Washington and Oregon State to secure public deposits	$	291,729
	Federal Reserve Bank to secure borrowings	42,582
	Other securities pledged	43,994
	Total securities pledged as collateral	$	378,305
	The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2014 and December 31, 2013:
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(in thousands)
	June 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	70,725	$	(160	)	$	296,832		$	(11,328	)	$	367,557	$	(11,488	)
	State and municipal securities	26,340		(101		)	61,424			(1,397		)	87,764		(1,498		)
	U.S. government agency and government-sponsored enterprise securities	16,231		(2		)	246,776			(4,442		)	263,007		(4,444		)
	U.S. government securities	—		—			19,288			(559		)	19,288		(559		)
	Other securities	—		—			5,131			(139		)	5,131		(139		)
	Total	$	113,296	$	(263	)	$	629,451		$	(17,865	)	$	742,747	$	(18,128	)
	December 31, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	492,921	$	(10,991	)	$	121,303		$	(12,684	)	$	614,224	$	(23,675	)
	State and municipal securities	112,400		(3,069		)	13,815			(923		)	126,215		(3,992		)
	U.S. government agency and government-sponsored enterprise securities	260,001		(8,063		)	28,447			(2,003		)	288,448		(10,066		)
	U.S. government securities	20,114		(967		)	—			—			20,114		(967		)
	Other securities	2,257		(58		)	2,783			(173		)	5,040		(231		)
	Total	$	887,693	$	(23,148	)	$	166,348		$	(15,783	)	$	1,054,041	$	(38,931	)
	At June 30, 2014, there were 54 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 45 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 June 30, 2014.
	At June 30, 2014, there were 88 state and municipal government securities in an unrealized loss position, of which 64 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 June 30, 2014, 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 June 30, 2014.
	At June 30, 2014, there were 27 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, 22 of which 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 June 30, 2014.
	At June 30, 2014, there were two U.S. government securities in an unrealized loss position, both of which 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 June 30, 2014.
	At June 30, 2014, there were two other securities in an unrealized loss position, both of which were in a continuous unrealized loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates and the additional risk premium investors are demanding for investment securities with these characteristics. The Company does not consider these investments to be other-than-temporarily impaired at June 30, 2014 as it has the intent and ability to hold the investments for sufficient time to allow for recovery in the market value.

Noncovered_Loans

Noncovered Loans	6 Months Ended
	Jun. 30, 2014
Noncovered Loans [Abstract]	'
Noncovered Loans	'
	Noncovered Loans
	Noncovered loans include loans originated through our branch network and loan departments as well as acquired loans that are not subject to Federal Deposit Insurance Corporation (“FDIC”) loss-sharing agreements.
	The following is an analysis of the noncovered loan portfolio by major types of loans (net of unearned income):
		June 30,				December 31,
		2014				2013
	Noncovered loans:	(in thousands)
	Commercial business	$	1,735,588			$	1,561,782
	Real estate:
	One-to-four family residential	102,632				108,317
	Commercial and multifamily residential	2,127,520				2,080,075
	Total real estate	2,230,152				2,188,392
	Real estate construction:
	One-to-four family residential	61,481				54,155
	Commercial and multifamily residential	134,140				126,390
	Total real estate construction	195,621				180,545
	Consumer	348,439				357,014
	Less: Net unearned income	(57,126		)		(68,282		)
	Total noncovered loans, net of unearned income	4,452,674				4,219,451
	Less: Allowance for loan and lease losses	(49,494		)		(52,280		)
	Total noncovered loans, net	$	4,403,180			$	4,167,171
	Loans held for sale	$	750			$	735
	At June 30, 2014 and December 31, 2013, 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 and Oregon.
	The Company has granted 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 $11.6 million at June 30, 2014 and $14.2 million at December 31, 2013. During the first six months of 2014, advances on related party loans totaled $1.1 million and repayments totaled $3.7 million.
	At June 30, 2014 and December 31, 2013, $1.07 billion and $1.08 billion of commercial and residential real estate loans were pledged as collateral on Federal Home Loan Bank borrowings and additional borrowing capacity. The Company has also pledged $43.9 million and $45.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at June 30, 2014 and December 31, 2013, respectively.
	The following is an analysis of noncovered, nonaccrual loans as of June 30, 2014 and December 31, 2013:
		June 30, 2014								December 31, 2013
		Recorded				Unpaid Principal				Recorded			Unpaid Principal
		Investment				Balance				Investment			Balance
		Nonaccrual				Nonaccrual				Nonaccrual			Nonaccrual
		Loans				Loans				Loans			Loans
	Noncovered loans:	(in thousands)
	Commercial business:
	Secured	$	11,190			$	15,739			$	12,433		$	19,186
	Unsecured	294				326				176			202
	Real estate:
	One-to-four family residential	3,024				5,125				2,667			4,678
	Commercial & multifamily residential:
	Commercial land	658				998				442			783
	Income property	5,062				7,648				4,267			5,383
	Owner occupied	5,319				7,388				6,334			7,486
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	581				1,761				3,246			6,601
	Residential construction	459				1,928				459			1,928
	Consumer	4,026				5,758				3,991			6,187
	Total	$	30,613			$	46,671			$	34,015		$	52,434
	The following is an aging of the recorded investment of the noncovered loan portfolio as of June 30, 2014 and December 31, 2013:
		Current				30 - 59				60 - 89			Greater				Total				Nonaccrual		Total Loans
		Loans				Days				Days			than 90				Past Due				Loans
						Past Due				Past Due			Days Past
													Due
	June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,640,938			$	3,046			$	2,602		$	—			$	5,648			$	11,190	$	1,657,776
	Unsecured	72,749				142				67			—				209				294		73,252
	Real estate:
	One-to-four family residential	95,653				1,415				570			—				1,985				3,024		100,662
	Commercial & multifamily residential:
	Commercial land	148,163				—				—			—				—				658		148,821
	Income property	1,191,882				1,336				9			—				1,345				5,062		1,198,289
	Owner occupied	746,217				410				2,575			—				2,985				5,319		754,521
	Real estate construction:
One-to-four family residential:
Land and acquisition	10,899				—				—			—				—				581		11,480
Residential construction	48,699				393				—			—				393				459		49,551
Commercial & multifamily residential:
Income property	87,603				—				—			—				—				—		87,603
Owner occupied	45,951				—				—			—				—				—		45,951
Consumer	319,958				717				67			—				784				4,026		324,768
Total	$	4,408,712			$	7,459			$	5,890		$	—			$	13,349			$	30,613	$	4,452,674
	Current				30 - 59				60 - 89			Greater				Total				Nonaccrual		Total Loans
	Loans				Days				Days			than 90				Past Due				Loans
					Past Due				Past Due			Days Past
												Due
December 31, 2013	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	1,457,820			$	12,713			$	681		$	—			$	13,394			$	12,433	$	1,483,647
Unsecured	72,255				156				17			—				173				176		72,604
Real estate:
One-to-four family residential	100,591				1,993				641			—				2,634				2,667		105,892
Commercial & multifamily residential:
Commercial land	142,034				—				358			—				358				442		142,834
Income property	1,138,732				144				3,289			—				3,433				4,267		1,146,432
Owner occupied	749,561				4,714				—			—				4,714				6,334		760,609
Real estate construction:
One-to-four family residential:
Land and acquisition	8,225				199				—			—				199				3,246		11,670
Residential construction	41,533				—				—			—				—				459		41,992
Commercial & multifamily residential:
Income property	86,521				—				—			—				—				—		86,521
Owner occupied	38,916				—				—			—				—				—		38,916
Consumer	322,685				835				823			—				1,658				3,991		328,334
Total	$	4,158,873			$	20,754			$	5,809		$	—			$	26,563			$	34,015	$	4,219,451
The following is an analysis of impaired loans as of June 30, 2014 and December 31, 2013:
	Recorded Investment				Recorded Investment				Impaired Loans With											Impaired Loans Without
	of Loans				of Loans				Recorded Allowance											Recorded Allowance
	Collectively Measured				Individually
	for Contingency				Measured for
	Provision				Specific
					Impairment				Recorded			Unpaid				Related				Recorded		Unpaid
									Investment			Principal				Allowance				Investment		Principal
												Balance										Balance
June 30, 2014	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	1,651,286			$	6,490			$	1,332		$	2,450			$	128			$	5,158	$	5,929
Unsecured	73,233				19				19			19				19				—		—
Real estate:
One-to-four family residential	98,616				2,046				432			472				128				1,614		2,794
Commercial & multifamily residential:
Commercial land	148,722				99				—			—				—				99		398
Income property	1,190,323				7,966				—			—				—				7,966		12,518
Owner occupied	745,351				9,170				588			588				35				8,582		13,020
Real estate construction:
One-to-four family residential:
Land and acquisition	11,368				112				112			111				69				—		—
Residential construction	49,551				—				—			—				—				—		—
Commercial & multifamily residential:
Income property	87,603				—				—			—				—				—		—
Owner occupied	45,951				—				—			—				—				—		—
Consumer	324,616				152				20			26				1				132		199
Total	$	4,426,620			$	26,054			$	2,503		$	3,666			$	380			$	23,551	$	34,858
	Recorded Investment				Recorded Investment				Impaired Loans With											Impaired Loans Without
	of Loans				of Loans				Recorded Allowance											Recorded Allowance
	Collectively Measured				Individually
	for Contingency				Measured for
	Provision				Specific
					Impairment				Recorded			Unpaid				Related				Recorded		Unpaid
									Investment			Principal				Allowance				Investment		Principal
												Balance										Balance
December 31, 2013	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	1,478,560			$	5,087			$	2,866		$	2,885			$	343			$	2,221	$	2,560
Unsecured	72,569				35				35			35				35				—		—
Real estate:
One-to-four family residential	104,272				1,620				442			479				138				1,178		2,119
Commercial & multifamily residential:
Commercial land	142,719				115				—			—				—				115		398
Income property	1,140,019				6,413				918			933				26				5,495		7,885
Owner occupied	749,601				11,008				3,802			3,817				1,073				7,206		10,464
Real estate construction:
One-to-four family residential:
Land and acquisition	9,726				1,944				113			113				71				1,831		2,587
Residential construction	41,992				—				—			—				—				—		—
Commercial & multifamily residential:
Income property	86,521				—				—			—				—				—		—
Owner occupied	38,916				—				—			—				—				—		—
Consumer	328,167				167				23			27				4				144		210
Total	$	4,193,062			$	26,389			$	8,199		$	8,289			$	1,690			$	18,190	$	26,223
The following table provides additional information on impaired loans for the three and six month periods indicated.
	Three Months Ended June 30,															Six Months Ended June 30,
	2014								2013							2014						2013
	Average Recorded				Interest Recognized				Average Recorded			Interest Recognized				Average Recorded				Interest Recognized		Average Recorded		Interest Recognized
	Investment				on				Investment			on				Investment				on		Investment		on
	Impaired Loans				Impaired Loans				Impaired Loans			Impaired Loans				Impaired Loans				Impaired Loans		Impaired Loans		Impaired Loans
Noncovered loans:	(in thousands)
Commercial business:
Secured	$	6,933			$	17			$	6,481		$	4			$	6,318			$	33	$	5,941	$	8
Unsecured	23				—				68			1				27				1		76		1
Real estate:
One-to-four family residential	2,069				11				1,538			27				1,920				23		1,722		31
Commercial & multifamily residential:
Commercial land	103				—				2,559			—				107				—		2,591		—
Income property	7,213				74				10,478			133				6,946				136		9,704		161
Owner occupied	9,222				235				10,437			230				9,817				476		10,926		510
Real estate construction:
One-to-four family residential:
Land and acquisition	653				1				2,931			1				1,083				3		2,894		3
Residential construction	—				—				72			—				—				—		701		—
Consumer	155				3				425			2				159				5		326		3
Total	$	26,371			$	341			$	34,989		$	398			$	26,377			$	677	$	34,881	$	717
The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and six months ended June 30, 2014 and 2013:
	Three months ended June 30, 2014										Three months ended June 30, 2013
	Number of TDR Modifications			Pre-Modification				Post-Modification			Number of TDR Modifications			Pre-Modification				Post-Modification
				Outstanding				Outstanding						Outstanding				Outstanding
				Recorded				Recorded						Recorded				Recorded
				Investment				Investment						Investment				Investment
Noncovered loans:	(dollars in thousands)
Commercial business:
Secured	2			$	546			$	546		1			$	343			$	343
Commercial and multifamily residential:
Commercial land	—			—				—			1			137				137
Income property	—			—				—			3			943				943
Owner occupied	—			—				—			1			172				172
Total	2			$	546			$	546		6			$	1,595			$	1,595
	Six months ended June 30, 2014										Six months ended June 30, 2013
	Number of TDR Modifications			Pre-Modification				Post-Modification			Number of TDR Modifications			Pre-Modification				Post-Modification
				Outstanding				Outstanding						Outstanding				Outstanding
				Recorded				Recorded						Recorded				Recorded
				Investment				Investment						Investment				Investment
Noncovered loans:	(dollars in thousands)
Commercial business:
Secured	4			$	759			$	759		1			$	343			$	343
Real estate:
One-to-four family residential	2			494				494			—			—				—
Commercial and multifamily residential:
Commercial land	—			—				—			1			137				137
Income property	1			143				126			3			943				943
Owner occupied	—			—				—			1			172				172
Real estate construction:
One-to-four family residential:
Land and acquisition	—			—				—			1			117				117
Total	7			$	1,396			$	1,379		7			$	1,712			$	1,712
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 completed in the six month periods ending June 30, 2014 and 2013 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 $269 thousand of additional funds on loans classified as TDR as of June 30, 2014, but had no commitments to lend additional funds on loans classified as TDR as of December 31, 2013. The Company did not have any loans modified as TDR that defaulted within twelve months of being modified as TDR during the six month periods ended June 30, 2014 and 2013.

Allowance_for_Noncovered_Loan_

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit	6 Months Ended
	Jun. 30, 2014
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 Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit
	We maintain an allowance for loan and lease losses (“ALLL”) to absorb losses inherent in the loan portfolio. The size of the ALLL is determined through quarterly assessments of the probable estimated losses in the loan portfolio. Our methodology for making such assessments and determining the adequacy of the ALLL includes the following key elements:
	1	General valuation allowance consistent with the Contingencies topic of the FASB Accounting Standards Codification (“ASC”).
	2	Classified loss reserves on specific relationships. Specific allowances for identified problem loans are determined in accordance with the Receivables topic of the FASB ASC.
	3	The unallocated allowance provides for other factors inherent in our loan portfolio that may not have been contemplated in the general and specific components of the allowance. This unallocated amount generally comprises less than 5% of the allowance. The unallocated amount is reviewed quarterly based on trends in credit losses, the results of credit reviews and overall economic trends.
	The general valuation allowance is systematically calculated quarterly using quantitative and qualitative information about specific loan classes. The minimum required level with respect to which an entity develops a methodology to determine its allowance for loan and lease losses is by general categories of loans, such as commercial business, real estate, and consumer. However, the Company’s methodology in determining its allowance for loan and lease losses is prepared in a more detailed manner at the loan class level, utilizing specific categories such as commercial business secured, commercial business unsecured, real estate commercial land, and real estate income property multifamily.
	The quantitative information uses historical losses from a specific loan class and incorporates the loan’s risk rating migration from origination to the point of loss based upon the consideration of an appropriate look back period. A loan’s risk rating is primarily determined based upon the borrower’s ability to fulfill its debt obligation from a cash flow perspective. In the event there is financial deterioration of the borrower, the borrower’s other sources of income or repayment are also considered, including recent appraisal values for collateral dependent loans. The qualitative information takes into account general economic and business conditions affecting our marketplace, seasoning of the loan portfolio, duration of the business cycle, etc. to ensure our methodologies reflect the current economic environment and other factors as using historical loss information exclusively may not give an accurate estimate of inherent losses within the Company’s loan portfolio.
	When a loan is deemed to be impaired, the Company has to determine if a specific valuation allowance is required for that loan. The specific valuation allowance is a reserve, calculated at the individual loan level, for each loan determined to be both impaired and containing a value less than its recorded investment. The Company measures the impairment based on the discounted expected future cash flows, observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent or if foreclosure is probable. The specific reserve for each loan is equal to the difference between the recorded investment in the loan and its determined impairment value.
	The ALLL is increased by provisions for loan and lease losses (“provision”) charged to expense, and is reduced by loans charged off, net of recoveries or a recovery of previous provisions. While the Company’s management believes the best information available is used to determine the ALLL, changes in market conditions could result in adjustments to the ALLL, affecting net income, if circumstances differ from the assumptions used in determining the ALLL.
	We have used the same methodology for ALLL calculations during the six months ended June 30, 2014 and 2013. Adjustments to the percentages of the ALLL allocated to loan categories are made based on trends with respect to delinquencies and problem loans within each class of loans. The Company reviews the ALLL quantitative and qualitative methodology on a quarterly basis and makes adjustments when appropriate. The Company continues to strive towards maintaining a conservative approach to credit quality and will continue to prudently adjust our ALLL as necessary in order to maintain adequate reserves. The Company carefully monitors the loan portfolio and continues to emphasize the importance of credit quality.
	Once it is determined that all or a portion of a loan balance is uncollectable, and the amount can be reasonably estimated, the uncollectable portion of the loan is charged-off.
	The following tables show a detailed analysis of the allowance for loan and lease losses for noncovered loans for the three and six months ended June 30, 2014 and 2013:
			Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
			Balance												Balance		Reserve		Allocation
	Three months ended June 30, 2014		(in thousands)
	Noncovered loans:
	Commercial business:
	Secured		$	28,801		$	(1,642	)	$	1,435		$	(3,077	)	$	25,517	$	128	$	25,389
	Unsecured		746			(75		)	277			(194		)	754		19		735
	Real estate:
	One-to-four family residential		1,194			—			12			(123		)	1,083		128		955
	Commercial & multifamily residential:
	Commercial land		579			(29		)	2			(82		)	470		—		470
	Income property		10,107			(1,934		)	505			1,833			10,511		—		10,511
	Owner occupied		4,560			—			30			399			4,989		35		4,954
	Real estate construction:
	One-to-four family residential:
	Land and acquisition		580			—			2			(179		)	403		69		334
	Residential construction		696			—			440			(459		)	677		—		677
	Commercial & multifamily residential:
	Income property		320			—			—			94			414		—		414
	Owner occupied		154			—			—			12			166		—		166
	Consumer		2,637			(909		)	338			577			2,643		1		2,642
	Unallocated		68			—			—			1,799			1,867		—		1,867
	Total		$	50,442		$	(4,589	)	$	3,041		$	600		$	49,494	$	380	$	49,114
			Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
			Balance												Balance		Reserve		Allocation
	Six months ended June 30, 2014		(in thousands)
	Noncovered loans:
	Commercial business:
	Secured		$	31,027		$	(1,840	)	$	1,883		$	(5,553	)	$	25,517	$	128	$	25,389
	Unsecured		696			(110		)	319			(151		)	754		19		735
	Real estate:
	One-to-four family residential		1,252			(207		)	40			(2		)	1,083		128		955
	Commercial & multifamily residential:
	Commercial land		489			(29		)	19			(9		)	470		—		470
	Income property		9,234			(1,934		)	518			2,693			10,511		—		10,511
	Owner occupied		3,605			(1,023		)	39			2,368			4,989		35		4,954
	Real estate construction:
	One-to-four family residential:
	Land and acquisition		610			—			41			(248		)	403		69		334
	Residential construction		822			—			443			(588		)	677		—		677
	Commercial & multifamily residential:
	Income property		285			—			—			129			414		—		414
	Owner occupied		58			—			—			108			166		—		166
	Consumer		2,547			(1,636		)	591			1,141			2,643		1		2,642
	Unallocated		1,655			—			—			212			1,867		—		1,867
	Total		$	52,280		$	(6,779	)	$	3,893		$	100		$	49,494	$	380	$	49,114
			Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
			Balance												Balance		Reserve		Allocation
	Three months ended June 30, 2013		(in thousands)
	Noncovered loans:
	Commercial business:
Secured		$	26,871		$	(856	)	$	312		$	4,245		$	30,572	$	242	$	30,330
Unsecured		750			(105		)	40			136			821		51		770
Real estate:
One-to-four family residential		657			(28		)	141			(98		)	672		105		567
Commercial & multifamily residential:
Commercial land		433			(11		)	17			252			691		262		429
Income property		9,411			(35		)	27			292			9,695		76		9,619
Owner occupied		5,458			(568		)	40			(415		)	4,515		30		4,485
Real estate construction:
One-to-four family residential:
Land and acquisition		990			—			35			(256		)	769		73		696
Residential construction		538			—			14			(348		)	204		—		204
Commercial & multifamily residential:
Income property		382			—			—			(141		)	241		—		241
Owner occupied		108			—			—			(28		)	80		—		80
Consumer		2,364			(638		)	194			535			2,455		—		2,455
Unallocated		3,157			—			—			(2,174		)	983		—		983
Total		$	51,119		$	(2,241	)	$	820		$	2,000		$	51,698	$	839	$	50,859
		Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
		Balance												Balance		Reserve		Allocation
Six months ended June 30, 2013		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	27,270		$	(1,844	)	$	392		$	4,754		$	30,572	$	242	$	30,330
Unsecured		753			(431		)	73			426			821		51		770
Real estate:
One-to-four family residential		694			(144		)	141			(19		)	672		105		567
Commercial & multifamily residential:
Commercial land		460			(11		)	27			215			691		262		429
Income property		11,033			(818		)	106			(626		)	9,695		76		9,619
Owner occupied		6,362			(568		)	44			(1,323		)	4,515		30		4,485
Real estate construction:
One-to-four family residential:
Land and acquisition		1,171			(32		)	2,174			(2,544		)	769		73		696
Residential construction		635			(101		)	14			(344		)	204		—		204
Commercial & multifamily residential:
Income property		316			—			—			(75		)	241		—		241
Owner occupied		102			—			—			(22		)	80		—		80
Consumer		2,437			(809		)	241			586			2,455		—		2,455
Unallocated		1,011			—			—			(28		)	983		—		983
Total		$	52,244		$	(4,758	)	$	3,212		$	1,000		$	51,698	$	839	$	50,859
Changes in the allowance for unfunded commitments and letters of credit, a component of other liabilities in the consolidated balance sheet, are summarized as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(in thousands)
Balance at beginning of period		$	2,455		$	1,915		$	2,505		$	1,915
Net changes in the allowance for unfunded commitments and letters of credit		(100		)	550			(150		)	550
Balance at end of period		$	2,355		$	2,465		$	2,355		$	2,465
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, 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 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 loans have potential weaknesses that, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans with a risk rating of Substandard or worse are reported as classified loans in our allowance for loan and lease losses analysis. We review these loans to assess the ability of our borrowers to service all interest and principal obligations and, as a result, the risk rating may be adjusted accordingly. Substandard loans reflect loans where a loss is possible if loan weaknesses are not corrected. Doubtful loans have a high probability of loss, however, the amount of loss has not yet been determined. Loss loans are considered uncollectable and when identified, are charged off.
The following is an analysis of the credit quality of our noncovered loan portfolio as of June 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
June 30, 2014		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	1,572,391		$	41,465		$	43,920		$	—		$	—	$	1,657,776
Unsecured		72,825			199			228			—			—		73,252
Real estate:
One-to-four family residential		95,647			55			4,960			—			—		100,662
Commercial and multifamily residential:
Commercial land		145,901			—			2,920			—			—		148,821
Income property		1,173,006			4,455			20,828			—			—		1,198,289
Owner occupied		742,585			2,996			8,940			—			—		754,521
Real estate construction:
One-to-four family residential:
Land and acquisition		9,758			—			1,722			—			—		11,480
Residential construction		46,335			—			3,216			—			—		49,551
Commercial and multifamily residential:
Income property		87,603			—			—			—			—		87,603
Owner occupied		45,538			413			—			—			—		45,951
Consumer		319,518			5			5,245			—			—		324,768
Total		$	4,311,107		$	49,588		$	91,979		$	—		$	—	4,452,674
Less:
Allowance for loan and lease losses																49,494
Noncovered loans, net																$	4,403,180
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
December 31, 2013		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	1,372,038		$	43,309		$	68,300		$	—		$	—	$	1,483,647
Unsecured		72,226			199			179			—			—		72,604
Real estate:
One-to-four family residential		98,626			1,567			5,699			—			—		105,892
Commercial and multifamily residential:
Commercial land		137,850			—			4,984			—			—		142,834
Income property		1,108,033			5,473			32,926			—			—		1,146,432
Owner occupied		748,725			—			11,884			—			—		760,609
Real estate construction:
One-to-four family residential:
Land and acquisition		7,526			—			4,144			—			—		11,670
Residential construction		36,270			2,352			3,370			—			—		41,992
Commercial and multifamily residential:
Income property		86,206			—			315			—			—		86,521
Owner occupied		38,916			—			—			—			—		38,916
Consumer		321,348			331			6,188			467			—		328,334
Total		$	4,027,764		$	53,231		$	137,989		$	467		$	—	4,219,451
Less:
Allowance for loan and lease losses																52,280
Noncovered loans, net																$	4,167,171

Changes_in_Noncovered_Other_Re

Changes in Noncovered Other Real Estate Owned	6 Months Ended
	Jun. 30, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'
Changes in Noncovered Other Real Estate Owned	'
	Changes in Noncovered Other Real Estate Owned (“OREO”)
	The following tables set forth activity in noncovered OREO for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	15,841		$	11,916		$	23,834		$	10,676
	Established through acquisitions	—			14,708			—			14,708
	Transfers in, net of write-downs ($0, $11, $0 and $43, respectively)	2,090			2,067			2,334			4,777
	Additional OREO write-downs	(636		)	(477		)	(1,565		)	(570		)
	Proceeds from sale of OREO property	(2,196		)	(4,057		)	(10,298		)	(5,622		)
	Gain on sale of OREO, net	104			182			898			370
	Total noncovered OREO at end of period	$	15,203		$	24,339		$	15,203		$	24,339

Covered_Assets_and_FDIC_Losssh

Covered Assets and FDIC Loss-sharing Asset	6 Months Ended
	Jun. 30, 2014
Covered Assets And FDIC Loss Sharing Asset	'
Covered Assets and FDIC Loss sharing Asset	'
	Covered Assets and FDIC Loss-sharing Asset
	Covered Assets
	Covered assets consist of loans and OREO acquired in certain FDIC-assisted acquisitions during 2010 and 2011, for which the Bank entered into loss-sharing agreements, whereby the FDIC will cover a substantial portion of future losses on loans (and related unfunded loan commitments), OREO and certain accrued interest on loans during the terms of the agreements. Under the terms of the loss-sharing agreements, the FDIC will absorb 80% of losses and share in 80% of loss recoveries up to specified amounts. With respect to loss-sharing agreements for two acquisitions completed in 2010, after those specified amounts, the FDIC will absorb 95% of losses and share in 95% of loss recoveries. The loss-sharing provisions of the agreements for commercial and single-family mortgage loans are in effect for five and ten years, respectively, from the acquisition dates and the loss recovery provisions are in effect for eight and ten years, respectively, from the acquisition dates.
	Ten years and forty-five days after the acquisition dates, the Bank must pay to the FDIC a clawback in the event the losses from the acquisitions fail to reach stated levels. The amount of the clawback is determined by a formula specified in each individual loss-sharing agreement. As of June 30, 2014, the net present value of the Bank’s estimated clawback liability is $4.0 million, which is included in other liabilities on the consolidated balance sheets.
	The following is an analysis of our covered loans, net of related allowance for losses as of June 30, 2014 and December 31, 2013:
		June 30, 2014			December 31, 2013
	Covered loans:	(in thousands)
	Commercial business	$	60,287		$	72,870
	Real estate:
	One-to-four family residential	36,711			41,642
	Commercial and multifamily residential	153,765			170,879
	Total real estate	190,476			212,521
	Real estate construction:
	One-to-four family residential	9,444			14,781
	Commercial and multifamily residential	3,910			6,869
	Total real estate construction	13,354			21,650
	Consumer	30,755			34,101
	Subtotal of covered loans	294,872			341,142
	Less:
	Valuation discount resulting from acquisition accounting	32,971			43,297
	Allowance for loan losses	19,801			20,174
	Covered loans, net of allowance for loan losses	$	242,100		$	277,671
	Acquired impaired 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. Acquired 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. The transition matrix is a matrix of probability values that specifies the probability 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.
	Acquired impaired loans are also subject to the Company’s internal and external credit review and are risk rated using the same criteria as loans originated by the Company. However, risk ratings are not a clear indicator of losses on acquired loans as the loans were acquired with a significant discount and a majority of the losses are recoverable from the FDIC under the loss-sharing agreements.
	Losses attributable to draws on acquired loans, advanced subsequent to the loan acquisition date, are accounted for under ASC 450-20 and those amounts are also subject to the Company’s internal and external credit review. An allowance for loan losses is estimated in a similar manner as the originated loan portfolio, and a provision for loan losses is charged to earnings as necessary.
	The excess of cash flows expected to be collected over the initial fair value of acquired 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 table shows the changes in accretable yield for acquired loans for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	101,543		$	158,786		$	103,907		$	166,888
	Accretion	(10,055		)	(13,520		)	(20,624		)	(27,997		)
	Disposals	—			(1,998		)	(2,826		)	5,151
	Reclassifications (to) from nonaccretable difference	1,023			(2,757		)	12,054			(3,531		)
	Balance at end of period	$	92,511		$	140,511		$	92,511		$	140,511
	During the three months ended June 30, 2014, the Company recorded a provision for losses on covered loans of $1.5 million. Of this amount, $1.7 million was impairment calculated in accordance with ASC 310-30 and $200 thousand was a provision recapture to adjust the allowance for loss calculated under ASC 450-20 for draws on acquired loans. The impact to earnings of the $1.5 million of provision for covered loans was partially offset through noninterest income by a $1.2 million favorable adjustment to the change FDIC loss-sharing asset line item.
	The changes in the ALLL for covered loans for the three and six months ended June 30, 2014 and 2013 are summarized as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	20,129		$	29,489		$	20,174		$	30,056
	Loans charged off	(3,842		)	(2,642		)	(8,115		)	(5,024		)
	Recoveries	1,997			1,000			3,803			1,835
	Provision (recapture) for loan losses	1,517			(1,712		)	3,939			(732		)
	Balance at end of period	$	19,801		$	26,135		$	19,801		$	26,135
	The following is an analysis of the credit quality of our covered loan portfolio as of June 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	June 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	42,653		$	1,151		$	14,206		$	7		$	—	$	58,017
	Unsecured	2,168			—			102			—			—		2,270
	Real estate:
	One-to-four family residential	31,618			—			5,093			—			—		36,711
	Commercial and multifamily residential:
	Commercial land	10,410			—			7,253			—			—		17,663
	Income property	56,858			3,220			7,695			—			—		67,773
	Owner occupied	61,344			362			6,623			—			—		68,329
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	3,589			—			1,405			—			—		4,994
Residential construction	420			—			4,030			—			—		4,450
Commercial and multifamily residential:
Income property	1,478			—			1,491			—			—		2,969
Owner occupied	941			—			—			—			—		941
Consumer	27,531			—			3,224			—			—		30,755
Total	$	239,010		$	4,733		$	51,122		$	7		$	—	294,872
Less:
Valuation discount resulting from acquisition accounting															32,971
Allowance for loan losses															19,801
Covered loans, net															$	242,100
	Pass			Special Mention			Substandard			Doubtful			Loss		Total
December 31, 2013	(in thousands)
Covered loans:
Commercial business:
Secured	$	48,510		$	2,849		$	18,291		$	—		$	—	$	69,650
Unsecured	2,732			396			92			—			—		3,220
Real estate:
One-to-four family residential	35,066			1,842			4,734			—			—		41,642
Commercial and multifamily residential:
Commercial land	10,778			198			7,589			—			—		18,565
Income property	55,985			3,950			10,657			—			—		70,592
Owner occupied	67,653			111			13,958			—			—		81,722
Real estate construction:
One-to-four family residential:
Land and acquisition	4,674			2,739			1,936			—			—		9,349
Residential construction	3,008			—			2,424			—			—		5,432
Commercial and multifamily residential:
Income property	3,806			—			1,709			—			—		5,515
Owner occupied	1,074			—			280			—			—		1,354
Consumer	30,722			33			3,319			27			—		34,101
Total	$	264,008		$	12,118		$	64,989		$	27		$	—	341,142
Less:
Valuation discount resulting from acquisition accounting															43,297
Allowance for loan losses															20,174
Covered loans, net															$	277,671
The following table sets forth activity in covered OREO at carrying value for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
	(in thousands)
Covered OREO:
Balance at beginning of period	$	14,712		$	13,811		$	12,093		$	16,311
Transfers in	—			3,125			5,507			4,530
Write-downs	(338		)	(29		)	(989		)	(94		)
Proceeds from sale of OREO property	(2,530		)	(7,376		)	(5,634		)	(13,814		)
Net gain on sale of OREO	1,207			3,323			2,074			5,921
Total covered OREO at end of period	$	13,051		$	12,854		$	13,051		$	12,854
The covered OREO is subject to loss-sharing agreements with the FDIC in which the FDIC will share in 80% of additional write-downs, as well as gains and losses on covered OREO sales, or 95%, if applicable, of additional write-downs, as wells as gains and losses on covered OREO sales if the minimum loss share thresholds are met.
FDIC Loss-sharing Asset
At June 30, 2014, the FDIC loss-sharing asset is comprised of a $25.0 million FDIC indemnification asset and a $2.9 million FDIC receivable. The indemnification represents the cash flows the Company expects to collect from the FDIC under the loss-sharing agreements and the FDIC receivable represents the reimbursable amounts from the FDIC that have not yet been received.
For covered loans, the Company remeasures contractual and expected cash flows on a quarterly basis. When the quarterly remeasurement process results in a decrease in expected cash flows due to an increase in expected credit losses, impairment is recorded. As a result of this impairment, the indemnification asset is increased to reflect anticipated future cash to be received from the FDIC. Consistent with the loss-sharing agreements between the Company and the FDIC, the amount of the increase to the indemnification asset is measured as 80% of the resulting impairment.
Alternatively, when the quarterly remeasurement results in an increase in expected future cash flows due to a decrease in expected credit losses, the nonaccretable difference decreases and the effective yield of the related loan portfolio is increased. As a result of the improved expected cash flows, the indemnification asset would be reduced first by the amount of any impairment previously recorded and, second, by increased amortization over the remaining life of the related loss-sharing agreement.
The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and six months ended June 30, 2014 and 2013:
	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
	(in thousands)
Balance at beginning of period	$	36,837		$	83,115		$	39,846		$	96,354
Adjustments not reflected in income:
Cash payments from the FDIC	(3,442		)	(3,268		)	(1,765		)	(6,387		)
FDIC reimbursable losses (recoveries), net	(364		)	664			(231		)	1,027
Adjustments reflected in income:
Amortization, net	(5,764		)	(9,801		)	(12,216		)	(19,580		)
Loan impairment (recapture)	1,214			(1,370		)	3,151			(585		)
Sale of other real estate	(965		)	(2,251		)	(1,721		)	(3,597		)
Write-downs of other real estate	276			102			792			154
Other	189			183			125			(12		)
Balance at end of period	$	27,981		$	67,374		$	27,981		$	67,374

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Other Intangible Assets
	In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value.
	The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.
	The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Goodwill
	Goodwill at beginning of period	$	343,952		$	115,554		$	343,952		$	115,554
	Established through acquisitions (1)	—			228,398			—			228,398
	Total goodwill	343,952			343,952			343,952			343,952
	Other intangible assets, net
	Core deposit intangible:
	Gross core deposit intangible balance at beginning of period	47,698			32,441			47,698			32,441
	Accumulated amortization at beginning of period	(24,344		)	(17,748		)	(22,765		)	(16,720		)
	Core deposit intangible, net at beginning of period	23,354			14,693			24,933			15,721
	Established through acquisitions (1)	—			15,257			—			15,257
	CDI current period amortization	(1,481		)	(1,693		)	(3,060		)	(2,721		)
	Total core deposit intangible, net at end of period	21,873			28,257			21,873			28,257
	Intangible assets not subject to amortization	919			913			919			913
	Other intangible assets, net at end of period	22,792			29,170			22,792			29,170
	Total goodwill and other intangible assets at end of period	$	366,744		$	373,122		$	366,744		$	373,122
	__________
	(1) Goodwill established through acquisitions has been retrospectively adjusted for the prior year periods due to adjustments to provisional amounts made related to the West Coast acquisition. See Note 3, Business Combinations, for additional information regarding goodwill and intangible assets recorded related to the acquisition of West Coast on April 1, 2013.
	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining six months ending December 31, 2014 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2014	$	2,903
	2015	4,934
	2016	4,195
	2017	3,361
	2018	2,500

Shareholders_Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	Shareholders’ Equity
	Preferred Stock. In conjunction with the acquisition of West Coast, the Company issued 8,782 shares of mandatorily convertible cumulative participating preferred stock, Series B (“Series B Preferred Stock”). The Series B Preferred Stock is not subject to the operation of a sinking fund. The Series B Preferred Stock is not redeemable by the Company and is perpetual with no maturity. The holders of Series B Preferred Stock have no general voting rights. If the Company declares and pays a dividend to its common shareholders, it must declare and pay to its holders of Series B Preferred Stock, on the same date, a dividend in an amount per share of the Series B Preferred Stock that is intended to provide such holders dividends in the amount they would have received if shares of Series B Preferred Stock had been converted into common stock as of that date. The outstanding shares of Series B Preferred Stock are convertible into 102,363 shares of Company common stock.
	Warrants to Purchase Common Stock. In conjunction with the acquisition of West Coast, the Company issued Amended and Restated Warrants (the “Warrants”) to purchase shares of Company common stock at an exercise price of $8.58 per share. The Company’s Amended and Restated Warrants amended and restated Class C Warrants previously issued by West Coast. The Warrants were immediately exercisable and will expire on October 23, 2016. At June 30, 2014, the aggregate number of shares of Company common stock and value called for by warrants outstanding was 582,799 and $5.0 million, respectively. This reflects the exercise of 1,631,840 warrant shares during the six month period ended June 30, 2014. As the warrants contain a cashless exercise feature, the net shares issued by the Company as a result of this exercise activity was 1,139,698.
	Dividends. On January 23, 2014 the Company declared a quarterly cash dividend of $0.12 per common share and common share equivalent for holders of preferred stock, payable on February 19, 2014 to shareholders of record at the close of business February 5, 2014. On April 23, 2014, the Company declared a regular quarterly cash dividend of $0.12 per common share, and common share equivalent for holders of preferred stock, and a special, one-time cash dividend of $0.12 per common share, and common share equivalent for holders of preferred stock, both payable on May 21, 2014 to shareholders of record at the close of business May 7, 2014. Subsequent to quarter end, on July 23, 2014, the Company declared a regular quarterly cash dividend of $0.14 per common share, and common share equivalent for holders of preferred stock and a special, one-time cash dividend of $0.14 per common share, and common share equivalent for holders of preferred stock, both payable on August 20, 2014 to shareholders of record at the close of business August 6, 2014. 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_Comprehensiv

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Accumulated Other Comprehensive Income	'
	Accumulated Other Comprehensive Income (Loss)
	The following table shows changes in accumulated other comprehensive income (loss) by component for the three and six month periods ended June 30, 2014 and 2013:
		Unrealized Gains and Losses on Available-for-Sale Securities (1)			Unrealized Gains and Losses on Pension Plan Liability (1)			Total (1)
	Three months ended June 30, 2014	(in thousands)
	Beginning balance	$	(3,131	)	$	(1,912	)	$	(5,043	)
	Other comprehensive income before reclassifications	8,768			—			8,768
	Amounts reclassified from accumulated other comprehensive loss (2)	(189		)	24			(165		)
	Net current-period other comprehensive income	8,579			24			8,603
	Ending balance	$	5,448		$	(1,888	)	$	3,560
	Three months ended June 30, 2013
	Beginning balance	$	18,185		$	(1,466	)	$	16,719
	Other comprehensive loss before reclassifications	(25,930		)	—			(25,930		)
	Amounts reclassified from accumulated other comprehensive income (2)	(59		)	60			1
	Net current-period other comprehensive income (loss)	(25,989		)	60			(25,929		)
	Ending balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Six months ended June 30, 2014
	Beginning balance	$	(10,108	)	$	(1,936	)	$	(12,044	)
	Other comprehensive income before reclassifications	15,887			—			15,887
	Amounts reclassified from accumulated other comprehensive income (2)	(331		)	48			(283		)
	Net current-period other comprehensive income	15,556			48			15,604
	Ending balance	$	5,448		$	(1,888	)	$	3,560
	Six months ended June 30, 2013
	Beginning balance	$	20,918		$	(769	)	$	20,149
	Other comprehensive loss before reclassifications	(28,423		)	(756		)	(29,179		)
	Amounts reclassified from accumulated other comprehensive income (2)	(299		)	119			(180		)
	Net current-period other comprehensive loss	(28,722		)	(637		)	(29,359		)
	Ending balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	__________
	(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
	(2) See following table for details about these reclassifications.
	The following table shows details regarding the reclassifications from accumulated other comprehensive income for the three month periods ended June 30, 2014 and 2013:
		Amount Reclassified from Accumulated Other Comprehensive Loss
		Three Months Ended June 30,						Six Months Ended June 30,						Affected line Item in the Consolidated
		2014			2013			2014			2013			Statement of Income
		(in thousands)
	Unrealized gains and losses on available-for-sale securities
	Investment securities gains	$	296		$	92		$	519		$	462		Investment securities gains, net
		296			92			519			462			Total before tax
		(107		)	(33		)	(188		)	(163		)	Income tax provision
		$	189		$	59		$	331		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(37	)	$	(92	)	$	(74	)	$	(184	)	Compensation and employee benefits
		(37		)	(92		)	(74		)	(184		)	Total before tax
		13			32			26			65			Income tax benefit
		$	(24	)	$	(60	)	$	(48	)	$	(119	)	Net of tax

Derivatives_and_Balance_Sheet_

Derivatives and Balance Sheet Offsetting	6 Months Ended
	Jun. 30, 2014
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 June 30, 2014 and December 31, 2013 was $208.3 million and $179.5 million, respectively. There was no impact to the statement of income for the three month periods ending June 30, 2014 and 2013.
	The following table presents the fair value of derivatives not designated as hedging instruments at June 30, 2014 and December 31, 2013:
		Asset Derivatives									Liability Derivatives
		June 30, 2014						December 31, 2013			June 30, 2014						December 31, 2013
		Balance Sheet		Fair Value				Balance Sheet	Fair Value		Balance Sheet		Fair Value				Balance Sheet	Fair Value
		Location						Location			Location						Location
		(in thousands)
	Interest rate contracts	Other assets		$	10,559			Other assets	$	9,044	Other liabilities		$	10,559			Other liabilities	$	9,044
	The Company is party to interest rate swap agreements and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.
		Gross Amounts of Recognized Assets/Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets			Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
											Collateral Posted				Net Amount
	June 30, 2014	(in thousands)
	Assets
	Interest rate contracts	$	10,559			$	—		$	10,559	$	—			$	10,559
	Liabilities
	Interest rate contracts	$	10,559			$	—		$	10,559	$	(10,559	)		$	—
	Repurchase agreements	$	25,000			$	—		$	25,000	$	(25,000	)		$	—
	December 31, 2013
	Assets
	Interest rate contracts	$	9,044			$	—		$	9,044	$	—			$	9,044
	Liabilities
	Interest rate contracts	$	9,044			$	—		$	9,044	$	(9,044	)		$	—
	Repurchase agreements	$	25,000			$	—		$	25,000	$	(25,000	)		$	—

Fair_Value_Accounting_and_Meas

Fair Value Accounting and Measurement	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Accounting and Measurement	'
	Fair Value Accounting and Measurement
	The Fair Value Measurements and Disclosures topic of the FASB ASC defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value. We hold fixed and variable rate interest-bearing securities, investments in marketable equity securities and certain other financial instruments, which are carried at fair value. Fair value is determined based upon quoted prices when available or through the use of alternative approaches, such as matrix or model pricing, when market quotes are not readily accessible or available.
	The valuation techniques are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own market assumptions. These two types of inputs create the following fair value hierarchy:
	Level 1 – Quoted prices for identical instruments in active markets that are accessible at the measurement date.
	Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model derived valuations whose inputs are observable or whose significant value drivers are observable.
	Level 3 – Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable.
	Fair values are determined as follows:
	Securities at fair value are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors. These fair value calculations are considered a Level 2 input method under the provisions of the Fair Value Measurements and Disclosures topic of the FASB ASC for all securities other than U.S. Treasury notes, which are considered a Level 1 input method.
	Interest rate contract positions are valued in models, which use as their basis, readily observable market parameters and are classified within Level 2 of the valuation hierarchy.
	The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at June 30, 2014 and December 31, 2013 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
	June 30, 2014	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	862,618	$	—		$	862,618	$	—
	State and municipal debt securities	380,506		—			380,506		—
	U.S. government agency and government-sponsored enterprise securities	321,389		—			321,389		—
	U.S. government securities	20,337		20,337			—		—
	Other securities	5,167		—			5,167		—
	Total securities available for sale	$	1,590,017	$	20,337		$	1,569,680	$	—
	Other assets (Interest rate contracts)	$	10,559	$	—		$	10,559	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	10,559	$	—		$	10,559	$	—
		Fair value		Fair Value Measurements at Reporting Date Using
				Level 1			Level 2		Level 3
	December 31, 2013	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	948,408	$	—		$	948,408	$	—
	State and municipal debt securities	364,470		—			364,470		—
	U.S. government agency and government-sponsored enterprise securities	326,039		—			326,039		—
	U.S. government securities	20,114		20,114			—		—
	Other securities	5,080		—			5,080		—
	Total securities available for sale	$	1,664,111	$	20,114		$	1,643,997	$	—
	Other assets (Interest rate contracts)	$	9,044	$	—		$	9,044	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	9,044	$	—		$	9,044	$	—
	There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the six month periods ended June 30, 2014 and 2013. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.
	Nonrecurring Measurements
	Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:
	Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the ALLL 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 and other personal property owned (“OPPO”)—OREO and OPPO are real and personal property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO and OPPO are generally measured based on the item’s fair market value as indicated by an appraisal or a letter of intent to purchase. OREO and OPPO are recorded at the lower of carrying amount or fair value less estimated costs to sell. This amount becomes the property’s new basis. Any write-downs based on the property fair value less estimated costs to sell at the date of acquisition are charged to the allowance for loan and lease losses. Management periodically reviews OREO and OPPO in an effort to ensure the property is carried at the lower of its new basis or fair value, net of estimated costs to sell. Any write-downs subsequent to acquisition are charged to earnings. The initial and subsequent write-down 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 OPPO 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 the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the three and six month periods ended June 30, 2014 and 2013:
		Fair value at June 30, 2014		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended		Losses During the Six Months Ended
				Level 1			Level 2		Level 3		30-Jun-14		30-Jun-14
		(in thousands)
	Noncovered OREO	$	1,389	$	—		$	—	$	1,389	$	636	$	1,180
	Covered OREO	1,837		—			—		1,837		226		422
		$	3,226	$	—		$	—	$	3,226	$	862	$	1,602
		Fair value at		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended		Losses During the Six Months Ended
		June 30, 2013		Level 1			Level 2		Level 3		30-Jun-13		30-Jun-13
		(in thousands)
	Impaired loans	$	4,198	$	—		$	—	$	4,198	$	656	$	730
	Noncovered OREO	1,965		—			—		1,965		469		500
	Covered OREO	395		—			—		395		29		94
		$	6,558	$	—		$	—	$	6,558	$	1,154	$	1,324
	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 and OPPO disclosed above represent the write-downs taken at foreclosure that were charged to the allowance for loan and lease losses, as well as subsequent write-downs from updated appraisals that were charged 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 June 30, 2014		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(dollars in thousands)
	Noncovered OREO	$	1,389	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Covered OREO	1,837		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
	Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
	June 30, 2013
	(dollars in thousands)
Impaired loans	$	3,777	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Impaired loans - other collateral (3)	421		Fair Market Value of Collateral		Adjustment to Stated value	(50%) (4)
Noncovered OREO	1,965		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Covered OREO	395		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate, noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of accounts receivable and inventory.
(4) As there was only one impaired loan collateralized by other collateral, a range of discounts could not be provided.
Fair value of financial instruments
Because broadly traded markets do not exist for most of the Company’s financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. These determinations are subjective in nature, involve uncertainties and matters of significant judgment and do not include tax ramifications; therefore, the results cannot be determined with precision, substantiated by comparison to independent markets and may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein do not represent, and should not be construed to represent, the underlying value of the Company.
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash and due from banks and interest-earning deposits with banks—The fair value of financial instruments that are short-term or reprice frequently and that have little or no risk are considered to have a fair value that approximates carrying value (Level 1).
Securities available for sale—Securities at fair value, other than U.S. Treasury Notes, are priced using a combination of market activity, industry recognized information sources, yield curves, discounted cash flow models and other factors (Level 2). U.S. Treasury Notes are priced using quotes in active markets (Level 1).
Federal Home Loan Bank stock—The fair value is based upon the par value of the stock which equates to its carrying value (Level 2).
Loans—Loans are not recorded at fair value on a recurring basis. Nonrecurring fair value adjustments are periodically recorded on impaired loans that are measured for impairment based on the fair value of collateral. For most performing loans, fair value is estimated using expected duration and lending rates that would have been offered on June 30, 2014 or December 31, 2013, for loans which mirror the attributes of the loans with similar rate structures and average maturities. The fair values resulting from these calculations are reduced by an amount representing the change in estimated fair value attributable to changes in borrowers’ credit quality since the loans were originated. For nonperforming loans, fair value is estimated by applying a valuation discount based upon loan sales data from the FDIC. For covered loans, fair value is estimated by discounting the expected future cash flows using a lending rate that would have been offered on June 30, 2014 (Level 3).
FDIC loss-sharing asset —The fair value of the FDIC loss-sharing asset is estimated based on discounting the expected future cash flows using an estimated market rate (Level 3).
Interest rate contracts—Interest rate swap positions are valued in models, which use readily observable market parameters as their basis (Level 2).
Deposits—For deposits with no contractual maturity, the fair value is equal to the carrying value (Level 1). The fair value of fixed maturity deposits is based on discounted cash flows using the difference between the deposit rate and current market rates for deposits of similar remaining maturities (Level 2).
FHLB advances—The fair value of Federal Home Loan Bank of Seattle (the “FHLB”) advances is estimated based on discounting the future cash flows using the market rate currently offered (Level 2).
Repurchase Agreements—The fair value of securities sold under agreement to repurchase is estimated based on discounting the future cash flows using the market rate currently offered (Level 2).
Other Financial Instruments—The majority of our commitments to extend credit and standby letters of credit carry current market interest rates if converted to loans, as such, carrying value is assumed to equal fair value.
The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at June 30, 2014 and December 31, 2013:
	June 30, 2014
	Carrying		Fair			Level 1		Level 2		Level 3
	Amount		Value
	(in thousands)
Assets
Cash and due from banks	$	193,816	$	193,816		$	193,816	$	—	$	—
Interest-earning deposits with banks	30,646		30,646			30,646		—		—
Securities available for sale	1,590,017		1,590,017			20,338		1,569,679		—
FHLB stock	31,912		31,912			—		31,912		—
Loans	4,645,280		4,790,933			—		—		4,790,933
FDIC loss-sharing asset	27,981		9,502			—		—		9,502
Interest rate contracts	10,559		10,559			—		10,559		—
Liabilities
Deposits	$	5,985,069	$	5,983,825		$	5,513,961	$	469,864	$	—
FHLB Advances	110,587		111,060			—		111,060		—
Repurchase agreements	25,000		26,231			—		26,231		—
Interest rate contracts	10,559		10,559			—		10,559		—
	December 31, 2013
	Carrying		Fair			Level 1		Level 2		Level 3
	Amount		Value
	(in thousands)
Assets
Cash and due from banks	$	165,030	$	165,030		$	165,030	$	—	$	—
Interest-earning deposits with banks	14,531		14,531			14,531		—		—
Securities available for sale	1,664,111		1,664,111			20,114		1,643,997		—
FHLB stock	32,529		32,529			—		32,529		—
Loans held for sale	735		735			—		735		—
Loans	4,444,842		4,605,038			—		—		4,605,038
FDIC loss-sharing asset	39,846		11,248			—		—		11,248
Interest rate contracts	9,044		9,044			—		9,044		—
Liabilities
Deposits	$	5,959,475	$	5,958,747		$	5,449,546	$	509,201	$	—
FHLB Advances	36,606		35,080			—		35,080		—
Repurchase agreements	25,000		26,361			—		26,361		—
Interest rate contracts	9,044		9,044			—		9,044		—

Earnings_per_Common_Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2014
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 six months ended June 30, 2014 and 2013:
			Three Months Ended				Six Months Ended
			June 30,				June 30,
			2014		2013		2014		2013
			(in thousands except per share)
	Basic EPS:
	Net income		$	21,227	$	14,591	$	41,071	$	26,767
	Less: Earnings allocated to participating securities
	Preferred shares		41		29		79		30
	Nonvested restricted shares		206		124		378		244
	Earnings allocated to common shareholders		$	20,980	$	14,438	$	40,614	$	26,493
	Weighted average common shares outstanding		52,088		50,788		51,600		45,099
	Basic earnings per common share		$	0.4	$	0.28	$	0.79	$	0.59
	Diluted EPS:
	Earnings allocated to common shareholders (1)		$	20,981	$	14,441	$	40,617	$	26,495
	Weighted average common shares outstanding		52,088		50,788		51,600		45,099
	Dilutive effect of equity awards		406		1,337		863		659
	Weighted average diluted common shares outstanding		52,494		52,125		52,463		45,758
	Diluted earnings per common share		$	0.4	$	0.28	$	0.77	$	0.58
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive		63		143		73		76
	__________
	-1	Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.

Subsequent_Event

Subsequent Event	6 Months Ended
	Jun. 30, 2014
Subsequent Event [Line Items]	'
Subsequent Events [Text Block]	'
	Subsequent Event
	On July 23, 2014, we entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Intermountain Community Bancorp, an Idaho corporation (“Intermountain”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Intermountain will merge with and into Columbia (the “Merger”), with Columbia continuing as the surviving corporation. Immediately after the Merger, Panhandle State Bank, an Idaho state-chartered bank and wholly-owned subsidiary of Intermountain, will merge with and into our wholly-owned subsidiary, Columbia Bank. The closing of the transaction is subject to the satisfaction of certain customary conditions, including, among other things, the receipt of required regulatory approvals and the approval of Intermountain’s shareholders. Under the terms of the merger agreement, Intermountain shareholders are entitled to receive in respect of each share of Intermountain common stock, consideration in the form of cash, Columbia common stock or a unit consisting of a mix of 0.6426 of a share of Columbia common stock and $2.2930 in cash. Based on Columbia’s closing stock price as of July 23, 2014, the merger consideration was valued at $121.5 million, or approximately $18.22 per Intermountain share. The value of the merger consideration will fluctuate based on the value of Columbia’s stock until closing.

Business_combinations_Tables

Business combinations (Tables)	6 Months Ended
	Jun. 30, 2014
Business Acquisition, Supplemental Pro Forma Information [Line Items]	'
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The following table presents certain unaudited pro forma information for the six month period ended June 30, 2013, for illustrative purposes only. This unaudited pro forma information was calculated as if West Coast had been acquired as of the beginning of the year prior to the acquisition. The unaudited estimated pro forma information combines the historical results of West Coast 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 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
		Six Months Ended June 30,
		2013
		(in thousands)
	Total revenues (net interest income plus noninterest income)	$	177,970
	Net income	$	43,256
	Earnings per share - basic	$	0.85
	Earnings per share - diluted	$	0.83

Securities_Tables

Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Available-for-sale Securities [Abstract]	'
Securities Available for Sale	'
	The following table summarizes the amortized cost, gross unrealized gains and losses and the resulting fair value of securities available for sale:
		Amortized		Gross			Gross			Fair Value
		Cost		Unrealized			Unrealized
				Gains			Losses
		(in thousands)
	June 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	862,248	$	11,858		$	(11,488	)	$	862,618
	State and municipal securities	368,221		13,783			(1,498		)	380,506
	U.S. government agency and government-sponsored enterprise securities	325,341		492			(4,444		)	321,389
	U.S. government securities	20,895		1			(559		)	20,337
	Other securities	5,284		22			(139		)	5,167
	Total	$	1,581,989	$	26,156		$	(18,128	)	$	1,590,017
	December 31, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	961,442	$	10,640		$	(23,674	)	$	948,408
	State and municipal securities	357,013		11,450			(3,993		)	364,470
	U.S. government agency and government-sponsored enterprise securities	335,671		434			(10,066		)	326,039
	U.S. government securities	21,081		—			(967		)	20,114
	Other securities	5,284		27			(231		)	5,080
	Total	$	1,680,491	$	22,551		$	(38,931	)	$	1,664,111
Schedule of Contractual Maturities of Investment Securities Available for Sale	'
	The scheduled contractual maturities of investment securities available for sale at June 30, 2014 are presented as follows:
		June 30, 2014
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	21,359	$	21,470
	Due after one year through five years	332,516		333,068
	Due after five years through ten years	431,423		432,434
	Due after ten years	791,407		797,878
	Other securities with no stated maturity	5,284		5,167
	Total investment securities available-for-sale	$	1,581,989	$	1,590,017
Carrying Value of Securities Pledged As Collateral	'
	The following table summarizes, as of June 30, 2014, the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		Carrying Amount
		(in thousands)
	Washington and Oregon State to secure public deposits	$	291,729
	Federal Reserve Bank to secure borrowings	42,582
	Other securities pledged	43,994
	Total securities pledged as collateral	$	378,305
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses	'
	The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2014 and December 31, 2013:
		Less than 12 Months					12 Months or More						Total
		Fair		Unrealized			Fair			Unrealized			Fair		Unrealized
		Value		Losses			Value			Losses			Value		Losses
		(in thousands)
	June 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	70,725	$	(160	)	$	296,832		$	(11,328	)	$	367,557	$	(11,488	)
	State and municipal securities	26,340		(101		)	61,424			(1,397		)	87,764		(1,498		)
	U.S. government agency and government-sponsored enterprise securities	16,231		(2		)	246,776			(4,442		)	263,007		(4,444		)
	U.S. government securities	—		—			19,288			(559		)	19,288		(559		)
	Other securities	—		—			5,131			(139		)	5,131		(139		)
	Total	$	113,296	$	(263	)	$	629,451		$	(17,865	)	$	742,747	$	(18,128	)
	December 31, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	492,921	$	(10,991	)	$	121,303		$	(12,684	)	$	614,224	$	(23,675	)
	State and municipal securities	112,400		(3,069		)	13,815			(923		)	126,215		(3,992		)
	U.S. government agency and government-sponsored enterprise securities	260,001		(8,063		)	28,447			(2,003		)	288,448		(10,066		)
	U.S. government securities	20,114		(967		)	—			—			20,114		(967		)
	Other securities	2,257		(58		)	2,783			(173		)	5,040		(231		)
	Total	$	887,693	$	(23,148	)	$	166,348		$	(15,783	)	$	1,054,041	$	(38,931	)

Noncovered_Loans_Tables

Noncovered Loans (Tables) (Noncovered Loans [Member])	6 Months Ended
	Jun. 30, 2014
Noncovered Loans [Member]	'
Financing Receivable, Recorded Investment [Line Items]	'
Analysis of Loan Portfolio by Major Types of Loans	'
	The following is an analysis of the noncovered loan portfolio by major types of loans (net of unearned income):
		June 30,				December 31,
		2014				2013
	Noncovered loans:	(in thousands)
	Commercial business	$	1,735,588			$	1,561,782
	Real estate:
	One-to-four family residential	102,632				108,317
	Commercial and multifamily residential	2,127,520				2,080,075
	Total real estate	2,230,152				2,188,392
	Real estate construction:
	One-to-four family residential	61,481				54,155
	Commercial and multifamily residential	134,140				126,390
	Total real estate construction	195,621				180,545
	Consumer	348,439				357,014
	Less: Net unearned income	(57,126		)		(68,282		)
	Total noncovered loans, net of unearned income	4,452,674				4,219,451
	Less: Allowance for loan and lease losses	(49,494		)		(52,280		)
	Total noncovered loans, net	$	4,403,180			$	4,167,171
	Loans held for sale	$	750			$	735
Analysis of nonaccrual loans	'
	The following is an analysis of noncovered, nonaccrual loans as of June 30, 2014 and December 31, 2013:
		June 30, 2014								December 31, 2013
		Recorded				Unpaid Principal				Recorded			Unpaid Principal
		Investment				Balance				Investment			Balance
		Nonaccrual				Nonaccrual				Nonaccrual			Nonaccrual
		Loans				Loans				Loans			Loans
	Noncovered loans:	(in thousands)
	Commercial business:
	Secured	$	11,190			$	15,739			$	12,433		$	19,186
	Unsecured	294				326				176			202
	Real estate:
	One-to-four family residential	3,024				5,125				2,667			4,678
	Commercial & multifamily residential:
	Commercial land	658				998				442			783
	Income property	5,062				7,648				4,267			5,383
	Owner occupied	5,319				7,388				6,334			7,486
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	581				1,761				3,246			6,601
	Residential construction	459				1,928				459			1,928
	Consumer	4,026				5,758				3,991			6,187
	Total	$	30,613			$	46,671			$	34,015		$	52,434
Past Due Financing Receivables	'
	The following is an aging of the recorded investment of the noncovered loan portfolio as of June 30, 2014 and December 31, 2013:
		Current				30 - 59				60 - 89			Greater				Total				Nonaccrual		Total Loans
		Loans				Days				Days			than 90				Past Due				Loans
						Past Due				Past Due			Days Past
													Due
	June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,640,938			$	3,046			$	2,602		$	—			$	5,648			$	11,190	$	1,657,776
	Unsecured	72,749				142				67			—				209				294		73,252
	Real estate:
	One-to-four family residential	95,653				1,415				570			—				1,985				3,024		100,662
	Commercial & multifamily residential:
	Commercial land	148,163				—				—			—				—				658		148,821
	Income property	1,191,882				1,336				9			—				1,345				5,062		1,198,289
	Owner occupied	746,217				410				2,575			—				2,985				5,319		754,521
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	10,899				—				—			—				—				581		11,480
	Residential construction	48,699				393				—			—				393				459		49,551
	Commercial & multifamily residential:
	Income property	87,603				—				—			—				—				—		87,603
	Owner occupied	45,951				—				—			—				—				—		45,951
	Consumer	319,958				717				67			—				784				4,026		324,768
	Total	$	4,408,712			$	7,459			$	5,890		$	—			$	13,349			$	30,613	$	4,452,674
		Current				30 - 59				60 - 89			Greater				Total				Nonaccrual		Total Loans
		Loans				Days				Days			than 90				Past Due				Loans
						Past Due				Past Due			Days Past
													Due
	December 31, 2013	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,457,820			$	12,713			$	681		$	—			$	13,394			$	12,433	$	1,483,647
	Unsecured	72,255				156				17			—				173				176		72,604
	Real estate:
	One-to-four family residential	100,591				1,993				641			—				2,634				2,667		105,892
	Commercial & multifamily residential:
	Commercial land	142,034				—				358			—				358				442		142,834
	Income property	1,138,732				144				3,289			—				3,433				4,267		1,146,432
	Owner occupied	749,561				4,714				—			—				4,714				6,334		760,609
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	8,225				199				—			—				199				3,246		11,670
	Residential construction	41,533				—				—			—				—				459		41,992
	Commercial & multifamily residential:
	Income property	86,521				—				—			—				—				—		86,521
	Owner occupied	38,916				—				—			—				—				—		38,916
	Consumer	322,685				835				823			—				1,658				3,991		328,334
	Total	$	4,158,873			$	20,754			$	5,809		$	—			$	26,563			$	34,015	$	4,219,451
Impaired Financing Receivables	'
	The following is an analysis of impaired loans as of June 30, 2014 and December 31, 2013:
		Recorded Investment				Recorded Investment				Impaired Loans With											Impaired Loans Without
		of Loans				of Loans				Recorded Allowance											Recorded Allowance
		Collectively Measured				Individually
		for Contingency				Measured for
		Provision				Specific
						Impairment				Recorded			Unpaid				Related				Recorded		Unpaid
										Investment			Principal				Allowance				Investment		Principal
													Balance										Balance
	June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,651,286			$	6,490			$	1,332		$	2,450			$	128			$	5,158	$	5,929
	Unsecured	73,233				19				19			19				19				—		—
	Real estate:
	One-to-four family residential	98,616				2,046				432			472				128				1,614		2,794
	Commercial & multifamily residential:
	Commercial land	148,722				99				—			—				—				99		398
	Income property	1,190,323				7,966				—			—				—				7,966		12,518
	Owner occupied	745,351				9,170				588			588				35				8,582		13,020
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	11,368				112				112			111				69				—		—
	Residential construction	49,551				—				—			—				—				—		—
	Commercial & multifamily residential:
	Income property	87,603				—				—			—				—				—		—
	Owner occupied	45,951				—				—			—				—				—		—
	Consumer	324,616				152				20			26				1				132		199
	Total	$	4,426,620			$	26,054			$	2,503		$	3,666			$	380			$	23,551	$	34,858
		Recorded Investment				Recorded Investment				Impaired Loans With											Impaired Loans Without
		of Loans				of Loans				Recorded Allowance											Recorded Allowance
		Collectively Measured				Individually
		for Contingency				Measured for
		Provision				Specific
						Impairment				Recorded			Unpaid				Related				Recorded		Unpaid
										Investment			Principal				Allowance				Investment		Principal
													Balance										Balance
	December 31, 2013	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,478,560			$	5,087			$	2,866		$	2,885			$	343			$	2,221	$	2,560
	Unsecured	72,569				35				35			35				35				—		—
	Real estate:
	One-to-four family residential	104,272				1,620				442			479				138				1,178		2,119
	Commercial & multifamily residential:
	Commercial land	142,719				115				—			—				—				115		398
	Income property	1,140,019				6,413				918			933				26				5,495		7,885
	Owner occupied	749,601				11,008				3,802			3,817				1,073				7,206		10,464
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	9,726				1,944				113			113				71				1,831		2,587
	Residential construction	41,992				—				—			—				—				—		—
	Commercial & multifamily residential:
	Income property	86,521				—				—			—				—				—		—
	Owner occupied	38,916				—				—			—				—				—		—
	Consumer	328,167				167				23			27				4				144		210
	Total	$	4,193,062			$	26,389			$	8,199		$	8,289			$	1,690			$	18,190	$	26,223
	The following table provides additional information on impaired loans for the three and six month periods indicated.
		Three Months Ended June 30,															Six Months Ended June 30,
		2014								2013							2014						2013
		Average Recorded				Interest Recognized				Average Recorded			Interest Recognized				Average Recorded				Interest Recognized		Average Recorded		Interest Recognized
		Investment				on				Investment			on				Investment				on		Investment		on
		Impaired Loans				Impaired Loans				Impaired Loans			Impaired Loans				Impaired Loans				Impaired Loans		Impaired Loans		Impaired Loans
Noncovered loans:	(in thousands)
Commercial business:
Secured	$	6,933			$	17			$	6,481		$	4			$	6,318			$	33	$	5,941	$	8
Unsecured	23				—				68			1				27				1		76		1
Real estate:
One-to-four family residential	2,069				11				1,538			27				1,920				23		1,722		31
Commercial & multifamily residential:
Commercial land	103				—				2,559			—				107				—		2,591		—
Income property	7,213				74				10,478			133				6,946				136		9,704		161
Owner occupied	9,222				235				10,437			230				9,817				476		10,926		510
Real estate construction:
One-to-four family residential:
Land and acquisition	653				1				2,931			1				1,083				3		2,894		3
Residential construction	—				—				72			—				—				—		701		—
Consumer	155				3				425			2				159				5		326		3
Total	$	26,371			$	341			$	34,989		$	398			$	26,377			$	677	$	34,881	$	717
Analysis of loans classified as Troubled Debt Restructurings (bTDRb)	'
		Three Months Ended June 30,															Six Months Ended June 30,
		2014								2013							2014						2013
		Average Recorded				Interest Recognized				Average Recorded			Interest Recognized				Average Recorded				Interest Recognized		Average Recorded		Interest Recognized
		Investment				on				Investment			on				Investment				on		Investment		on
		Impaired Loans				Impaired Loans				Impaired Loans			Impaired Loans				Impaired Loans				Impaired Loans		Impaired Loans		Impaired Loans
	Noncovered loans:	(in thousands)
	Commercial business:
	Secured	$	6,933			$	17			$	6,481		$	4			$	6,318			$	33	$	5,941	$	8
	Unsecured	23				—				68			1				27				1		76		1
	Real estate:
	One-to-four family residential	2,069				11				1,538			27				1,920				23		1,722		31
	Commercial & multifamily residential:
	Commercial land	103				—				2,559			—				107				—		2,591		—
	Income property	7,213				74				10,478			133				6,946				136		9,704		161
	Owner occupied	9,222				235				10,437			230				9,817				476		10,926		510
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	653				1				2,931			1				1,083				3		2,894		3
	Residential construction	—				—				72			—				—				—		701		—
	Consumer	155				3				425			2				159				5		326		3
	Total	$	26,371			$	341			$	34,989		$	398			$	26,377			$	677	$	34,881	$	717
	The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and six months ended June 30, 2014 and 2013:
		Three months ended June 30, 2014										Three months ended June 30, 2013
		Number of TDR Modifications			Pre-Modification				Post-Modification			Number of TDR Modifications			Pre-Modification				Post-Modification
					Outstanding				Outstanding						Outstanding				Outstanding
					Recorded				Recorded						Recorded				Recorded
					Investment				Investment						Investment				Investment
	Noncovered loans:	(dollars in thousands)
	Commercial business:
	Secured	2			$	546			$	546		1			$	343			$	343
	Commercial and multifamily residential:
	Commercial land	—			—				—			1			137				137
	Income property	—			—				—			3			943				943
	Owner occupied	—			—				—			1			172				172
	Total	2			$	546			$	546		6			$	1,595			$	1,595
		Six months ended June 30, 2014										Six months ended June 30, 2013
		Number of TDR Modifications			Pre-Modification				Post-Modification			Number of TDR Modifications			Pre-Modification				Post-Modification
					Outstanding				Outstanding						Outstanding				Outstanding
					Recorded				Recorded						Recorded				Recorded
					Investment				Investment						Investment				Investment
	Noncovered loans:	(dollars in thousands)
	Commercial business:
	Secured	4			$	759			$	759		1			$	343			$	343
	Real estate:
	One-to-four family residential	2			494				494			—			—				—
	Commercial and multifamily residential:
	Commercial land	—			—				—			1			137				137
	Income property	1			143				126			3			943				943
	Owner occupied	—			—				—			1			172				172
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	—			—				—			1			117				117
	Total	7			$	1,396			$	1,379		7			$	1,712			$	1,712

Allowance_for_Noncovered_Loan_1

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)	6 Months Ended
	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]	'
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 sheet, are summarized as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	2,455		$	1,915		$	2,505		$	1,915
	Net changes in the allowance for unfunded commitments and letters of credit	(100		)	550			(150		)	550
	Balance at end of period	$	2,355		$	2,465		$	2,355		$	2,465
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our covered loan portfolio as of June 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	June 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	42,653		$	1,151		$	14,206		$	7		$	—	$	58,017
	Unsecured	2,168			—			102			—			—		2,270
	Real estate:
	One-to-four family residential	31,618			—			5,093			—			—		36,711
	Commercial and multifamily residential:
	Commercial land	10,410			—			7,253			—			—		17,663
	Income property	56,858			3,220			7,695			—			—		67,773
	Owner occupied	61,344			362			6,623			—			—		68,329
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	3,589			—			1,405			—			—		4,994
	Residential construction	420			—			4,030			—			—		4,450
	Commercial and multifamily residential:
	Income property	1,478			—			1,491			—			—		2,969
	Owner occupied	941			—			—			—			—		941
	Consumer	27,531			—			3,224			—			—		30,755
	Total	$	239,010		$	4,733		$	51,122		$	7		$	—	294,872
	Less:
	Valuation discount resulting from acquisition accounting															32,971
	Allowance for loan losses															19,801
	Covered loans, net															$	242,100
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	December 31, 2013	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	48,510		$	2,849		$	18,291		$	—		$	—	$	69,650
	Unsecured	2,732			396			92			—			—		3,220
	Real estate:
	One-to-four family residential	35,066			1,842			4,734			—			—		41,642
	Commercial and multifamily residential:
	Commercial land	10,778			198			7,589			—			—		18,565
	Income property	55,985			3,950			10,657			—			—		70,592
	Owner occupied	67,653			111			13,958			—			—		81,722
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	4,674			2,739			1,936			—			—		9,349
	Residential construction	3,008			—			2,424			—			—		5,432
	Commercial and multifamily residential:
	Income property	3,806			—			1,709			—			—		5,515
	Owner occupied	1,074			—			280			—			—		1,354
	Consumer	30,722			33			3,319			27			—		34,101
	Total	$	264,008		$	12,118		$	64,989		$	27		$	—	341,142
	Less:
	Valuation discount resulting from acquisition accounting															43,297
	Allowance for loan losses															20,174
	Covered loans, net															$	277,671
Noncovered Loans [Member]	'
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 loan and lease losses for noncovered loans for the three and six months ended June 30, 2014 and 2013:
		Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
		Balance												Balance		Reserve		Allocation
	Three months ended June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	28,801		$	(1,642	)	$	1,435		$	(3,077	)	$	25,517	$	128	$	25,389
	Unsecured	746			(75		)	277			(194		)	754		19		735
	Real estate:
	One-to-four family residential	1,194			—			12			(123		)	1,083		128		955
	Commercial & multifamily residential:
	Commercial land	579			(29		)	2			(82		)	470		—		470
	Income property	10,107			(1,934		)	505			1,833			10,511		—		10,511
	Owner occupied	4,560			—			30			399			4,989		35		4,954
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	580			—			2			(179		)	403		69		334
	Residential construction	696			—			440			(459		)	677		—		677
	Commercial & multifamily residential:
	Income property	320			—			—			94			414		—		414
	Owner occupied	154			—			—			12			166		—		166
	Consumer	2,637			(909		)	338			577			2,643		1		2,642
	Unallocated	68			—			—			1,799			1,867		—		1,867
	Total	$	50,442		$	(4,589	)	$	3,041		$	600		$	49,494	$	380	$	49,114
		Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
		Balance												Balance		Reserve		Allocation
	Six months ended June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	31,027		$	(1,840	)	$	1,883		$	(5,553	)	$	25,517	$	128	$	25,389
	Unsecured	696			(110		)	319			(151		)	754		19		735
	Real estate:
	One-to-four family residential	1,252			(207		)	40			(2		)	1,083		128		955
	Commercial & multifamily residential:
	Commercial land	489			(29		)	19			(9		)	470		—		470
	Income property	9,234			(1,934		)	518			2,693			10,511		—		10,511
	Owner occupied	3,605			(1,023		)	39			2,368			4,989		35		4,954
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	610			—			41			(248		)	403		69		334
	Residential construction	822			—			443			(588		)	677		—		677
	Commercial & multifamily residential:
	Income property	285			—			—			129			414		—		414
	Owner occupied	58			—			—			108			166		—		166
	Consumer	2,547			(1,636		)	591			1,141			2,643		1		2,642
	Unallocated	1,655			—			—			212			1,867		—		1,867
	Total	$	52,280		$	(6,779	)	$	3,893		$	100		$	49,494	$	380	$	49,114
		Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
		Balance												Balance		Reserve		Allocation
	Three months ended June 30, 2013	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	26,871		$	(856	)	$	312		$	4,245		$	30,572	$	242	$	30,330
	Unsecured	750			(105		)	40			136			821		51		770
	Real estate:
	One-to-four family residential	657			(28		)	141			(98		)	672		105		567
	Commercial & multifamily residential:
	Commercial land	433			(11		)	17			252			691		262		429
	Income property	9,411			(35		)	27			292			9,695		76		9,619
	Owner occupied	5,458			(568		)	40			(415		)	4,515		30		4,485
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	990			—			35			(256		)	769		73		696
Residential construction	538			—			14			(348		)	204		—		204
Commercial & multifamily residential:
Income property	382			—			—			(141		)	241		—		241
Owner occupied	108			—			—			(28		)	80		—		80
Consumer	2,364			(638		)	194			535			2,455		—		2,455
Unallocated	3,157			—			—			(2,174		)	983		—		983
Total	$	51,119		$	(2,241	)	$	820		$	2,000		$	51,698	$	839	$	50,859
	Beginning			Charge-offs			Recoveries			Provision (Recovery)			Ending		Specific		General
	Balance												Balance		Reserve		Allocation
Six months ended June 30, 2013	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	27,270		$	(1,844	)	$	392		$	4,754		$	30,572	$	242	$	30,330
Unsecured	753			(431		)	73			426			821		51		770
Real estate:
One-to-four family residential	694			(144		)	141			(19		)	672		105		567
Commercial & multifamily residential:
Commercial land	460			(11		)	27			215			691		262		429
Income property	11,033			(818		)	106			(626		)	9,695		76		9,619
Owner occupied	6,362			(568		)	44			(1,323		)	4,515		30		4,485
Real estate construction:
One-to-four family residential:
Land and acquisition	1,171			(32		)	2,174			(2,544		)	769		73		696
Residential construction	635			(101		)	14			(344		)	204		—		204
Commercial & multifamily residential:
Income property	316			—			—			(75		)	241		—		241
Owner occupied	102			—			—			(22		)	80		—		80
Consumer	2,437			(809		)	241			586			2,455		—		2,455
Unallocated	1,011			—			—			(28		)	983		—		983
Total	$	52,244		$	(4,758	)	$	3,212		$	1,000		$	51,698	$	839	$	50,859
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our noncovered loan portfolio as of June 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	June 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,572,391		$	41,465		$	43,920		$	—		$	—	$	1,657,776
	Unsecured	72,825			199			228			—			—		73,252
	Real estate:
	One-to-four family residential	95,647			55			4,960			—			—		100,662
	Commercial and multifamily residential:
	Commercial land	145,901			—			2,920			—			—		148,821
	Income property	1,173,006			4,455			20,828			—			—		1,198,289
	Owner occupied	742,585			2,996			8,940			—			—		754,521
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	9,758			—			1,722			—			—		11,480
	Residential construction	46,335			—			3,216			—			—		49,551
	Commercial and multifamily residential:
	Income property	87,603			—			—			—			—		87,603
	Owner occupied	45,538			413			—			—			—		45,951
	Consumer	319,518			5			5,245			—			—		324,768
	Total	$	4,311,107		$	49,588		$	91,979		$	—		$	—	4,452,674
	Less:
	Allowance for loan and lease losses															49,494
	Noncovered loans, net															$	4,403,180
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	December 31, 2013	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,372,038		$	43,309		$	68,300		$	—		$	—	$	1,483,647
	Unsecured	72,226			199			179			—			—		72,604
	Real estate:
	One-to-four family residential	98,626			1,567			5,699			—			—		105,892
	Commercial and multifamily residential:
	Commercial land	137,850			—			4,984			—			—		142,834
	Income property	1,108,033			5,473			32,926			—			—		1,146,432
	Owner occupied	748,725			—			11,884			—			—		760,609
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	7,526			—			4,144			—			—		11,670
	Residential construction	36,270			2,352			3,370			—			—		41,992
	Commercial and multifamily residential:
	Income property	86,206			—			315			—			—		86,521
	Owner occupied	38,916			—			—			—			—		38,916
	Consumer	321,348			331			6,188			467			—		328,334
	Total	$	4,027,764		$	53,231		$	137,989		$	467		$	—	4,219,451
	Less:
	Allowance for loan and lease losses															52,280
	Noncovered loans, net															$	4,167,171

Changes_in_Noncovered_Other_Re1

Changes in Noncovered Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]	'
Summary of Noncovered Other Real Estate Owned	'
	The following tables set forth activity in noncovered OREO for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	15,841		$	11,916		$	23,834		$	10,676
	Established through acquisitions	—			14,708			—			14,708
	Transfers in, net of write-downs ($0, $11, $0 and $43, respectively)	2,090			2,067			2,334			4,777
	Additional OREO write-downs	(636		)	(477		)	(1,565		)	(570		)
	Proceeds from sale of OREO property	(2,196		)	(4,057		)	(10,298		)	(5,622		)
	Gain on sale of OREO, net	104			182			898			370
	Total noncovered OREO at end of period	$	15,203		$	24,339		$	15,203		$	24,339

Covered_Assets_and_FDIC_Losssh1

Covered Assets and FDIC Loss-sharing Asset (Tables)	6 Months Ended
	Jun. 30, 2014
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'
Analysis and Allowance for Losses on Covered Loans	'
	The following is an analysis of our covered loans, net of related allowance for losses as of June 30, 2014 and December 31, 2013:
		June 30, 2014			December 31, 2013
	Covered loans:	(in thousands)
	Commercial business	$	60,287		$	72,870
	Real estate:
	One-to-four family residential	36,711			41,642
	Commercial and multifamily residential	153,765			170,879
	Total real estate	190,476			212,521
	Real estate construction:
	One-to-four family residential	9,444			14,781
	Commercial and multifamily residential	3,910			6,869
	Total real estate construction	13,354			21,650
	Consumer	30,755			34,101
	Subtotal of covered loans	294,872			341,142
	Less:
	Valuation discount resulting from acquisition accounting	32,971			43,297
	Allowance for loan losses	19,801			20,174
	Covered loans, net of allowance for loan losses	$	242,100		$	277,671
Changes in Accretable Yield for Acquired Loans	'
	The following table shows the changes in accretable yield for acquired loans for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	101,543		$	158,786		$	103,907		$	166,888
	Accretion	(10,055		)	(13,520		)	(20,624		)	(27,997		)
	Disposals	—			(1,998		)	(2,826		)	5,151
	Reclassifications (to) from nonaccretable difference	1,023			(2,757		)	12,054			(3,531		)
	Balance at end of period	$	92,511		$	140,511		$	92,511		$	140,511
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our covered loan portfolio as of June 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	June 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	42,653		$	1,151		$	14,206		$	7		$	—	$	58,017
	Unsecured	2,168			—			102			—			—		2,270
	Real estate:
	One-to-four family residential	31,618			—			5,093			—			—		36,711
	Commercial and multifamily residential:
	Commercial land	10,410			—			7,253			—			—		17,663
	Income property	56,858			3,220			7,695			—			—		67,773
	Owner occupied	61,344			362			6,623			—			—		68,329
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	3,589			—			1,405			—			—		4,994
	Residential construction	420			—			4,030			—			—		4,450
	Commercial and multifamily residential:
	Income property	1,478			—			1,491			—			—		2,969
	Owner occupied	941			—			—			—			—		941
	Consumer	27,531			—			3,224			—			—		30,755
	Total	$	239,010		$	4,733		$	51,122		$	7		$	—	294,872
	Less:
	Valuation discount resulting from acquisition accounting															32,971
	Allowance for loan losses															19,801
	Covered loans, net															$	242,100
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	December 31, 2013	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	48,510		$	2,849		$	18,291		$	—		$	—	$	69,650
	Unsecured	2,732			396			92			—			—		3,220
	Real estate:
	One-to-four family residential	35,066			1,842			4,734			—			—		41,642
	Commercial and multifamily residential:
	Commercial land	10,778			198			7,589			—			—		18,565
	Income property	55,985			3,950			10,657			—			—		70,592
	Owner occupied	67,653			111			13,958			—			—		81,722
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	4,674			2,739			1,936			—			—		9,349
	Residential construction	3,008			—			2,424			—			—		5,432
	Commercial and multifamily residential:
	Income property	3,806			—			1,709			—			—		5,515
	Owner occupied	1,074			—			280			—			—		1,354
	Consumer	30,722			33			3,319			27			—		34,101
	Total	$	264,008		$	12,118		$	64,989		$	27		$	—	341,142
	Less:
	Valuation discount resulting from acquisition accounting															43,297
	Allowance for loan losses															20,174
	Covered loans, net															$	277,671
Covered OREO at Carrying Value	'
	The following table sets forth activity in covered OREO at carrying value for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Covered OREO:
	Balance at beginning of period	$	14,712		$	13,811		$	12,093		$	16,311
	Transfers in	—			3,125			5,507			4,530
	Write-downs	(338		)	(29		)	(989		)	(94		)
	Proceeds from sale of OREO property	(2,530		)	(7,376		)	(5,634		)	(13,814		)
	Net gain on sale of OREO	1,207			3,323			2,074			5,921
	Total covered OREO at end of period	$	13,051		$	12,854		$	13,051		$	12,854
FDIC Loss-sharing Asset	'
	The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and six months ended June 30, 2014 and 2013:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	36,837		$	83,115		$	39,846		$	96,354
	Adjustments not reflected in income:
	Cash payments from the FDIC	(3,442		)	(3,268		)	(1,765		)	(6,387		)
	FDIC reimbursable losses (recoveries), net	(364		)	664			(231		)	1,027
	Adjustments reflected in income:
	Amortization, net	(5,764		)	(9,801		)	(12,216		)	(19,580		)
	Loan impairment (recapture)	1,214			(1,370		)	3,151			(585		)
	Sale of other real estate	(965		)	(2,251		)	(1,721		)	(3,597		)
	Write-downs of other real estate	276			102			792			154
	Other	189			183			125			(12		)
	Balance at end of period	$	27,981		$	67,374		$	27,981		$	67,374
Covered Loans [Member]	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'
Allowance for Credit Losses on Financing Receivables	'
	The changes in the ALLL for covered loans for the three and six months ended June 30, 2014 and 2013 are summarized as follows:
		Three Months Ended June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	20,129		$	29,489		$	20,174		$	30,056
	Loans charged off	(3,842		)	(2,642		)	(8,115		)	(5,024		)
	Recoveries	1,997			1,000			3,803			1,835
	Provision (recapture) for loan losses	1,517			(1,712		)	3,939			(732		)
	Balance at end of period	$	19,801		$	26,135		$	19,801		$	26,135

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2014
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 June 30,						Six Months Ended June 30,
		2014			2013			2014			2013
		(in thousands)
	Goodwill
	Goodwill at beginning of period	$	343,952		$	115,554		$	343,952		$	115,554
	Established through acquisitions (1)	—			228,398			—			228,398
	Total goodwill	343,952			343,952			343,952			343,952
	Other intangible assets, net
	Core deposit intangible:
	Gross core deposit intangible balance at beginning of period	47,698			32,441			47,698			32,441
	Accumulated amortization at beginning of period	(24,344		)	(17,748		)	(22,765		)	(16,720		)
	Core deposit intangible, net at beginning of period	23,354			14,693			24,933			15,721
	Established through acquisitions (1)	—			15,257			—			15,257
	CDI current period amortization	(1,481		)	(1,693		)	(3,060		)	(2,721		)
	Total core deposit intangible, net at end of period	21,873			28,257			21,873			28,257
	Intangible assets not subject to amortization	919			913			919			913
	Other intangible assets, net at end of period	22,792			29,170			22,792			29,170
	Total goodwill and other intangible assets at end of period	$	366,744		$	373,122		$	366,744		$	373,122
Estimated Future Amortization Expense of Core Deposit Intangibles	'
	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining six months ending December 31, 2014 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2014	$	2,903
	2015	4,934
	2016	4,195
	2017	3,361
	2018	2,500

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
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 six month periods ended June 30, 2014 and 2013:
		Unrealized Gains and Losses on Available-for-Sale Securities (1)			Unrealized Gains and Losses on Pension Plan Liability (1)			Total (1)
	Three months ended June 30, 2014	(in thousands)
	Beginning balance	$	(3,131	)	$	(1,912	)	$	(5,043	)
	Other comprehensive income before reclassifications	8,768			—			8,768
	Amounts reclassified from accumulated other comprehensive loss (2)	(189		)	24			(165		)
	Net current-period other comprehensive income	8,579			24			8,603
	Ending balance	$	5,448		$	(1,888	)	$	3,560
	Three months ended June 30, 2013
	Beginning balance	$	18,185		$	(1,466	)	$	16,719
	Other comprehensive loss before reclassifications	(25,930		)	—			(25,930		)
	Amounts reclassified from accumulated other comprehensive income (2)	(59		)	60			1
	Net current-period other comprehensive income (loss)	(25,989		)	60			(25,929		)
	Ending balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Six months ended June 30, 2014
	Beginning balance	$	(10,108	)	$	(1,936	)	$	(12,044	)
	Other comprehensive income before reclassifications	15,887			—			15,887
	Amounts reclassified from accumulated other comprehensive income (2)	(331		)	48			(283		)
	Net current-period other comprehensive income	15,556			48			15,604
	Ending balance	$	5,448		$	(1,888	)	$	3,560
	Six months ended June 30, 2013
	Beginning balance	$	20,918		$	(769	)	$	20,149
	Other comprehensive loss before reclassifications	(28,423		)	(756		)	(29,179		)
	Amounts reclassified from accumulated other comprehensive income (2)	(299		)	119			(180		)
	Net current-period other comprehensive loss	(28,722		)	(637		)	(29,359		)
	Ending balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	__________
	(1) All amounts are net of tax. Amounts in parenthesis indicate debits.
	(2) See following table for details about these reclassifications.
Schedule of reclassifications from accumulated other comprehensive income [Table Text Block]	'
	The following table shows details regarding the reclassifications from accumulated other comprehensive income for the three month periods ended June 30, 2014 and 2013:
		Amount Reclassified from Accumulated Other Comprehensive Loss
		Three Months Ended June 30,						Six Months Ended June 30,						Affected line Item in the Consolidated
		2014			2013			2014			2013			Statement of Income
		(in thousands)
	Unrealized gains and losses on available-for-sale securities
	Investment securities gains	$	296		$	92		$	519		$	462		Investment securities gains, net
		296			92			519			462			Total before tax
		(107		)	(33		)	(188		)	(163		)	Income tax provision
		$	189		$	59		$	331		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(37	)	$	(92	)	$	(74	)	$	(184	)	Compensation and employee benefits
		(37		)	(92		)	(74		)	(184		)	Total before tax
		13			32			26			65			Income tax benefit
		$	(24	)	$	(60	)	$	(48	)	$	(119	)	Net of tax

Derivatives_and_Balance_Sheet_1

Derivatives and Balance Sheet Offsetting (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative [Line Items]	'
Balance Sheet Offsetting [Table Text Block]	'
	The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.
		Gross Amounts of Recognized Assets/Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets			Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
											Collateral Posted				Net Amount
	June 30, 2014	(in thousands)
	Assets
	Interest rate contracts	$	10,559			$	—		$	10,559	$	—			$	10,559
	Liabilities
	Interest rate contracts	$	10,559			$	—		$	10,559	$	(10,559	)		$	—
	Repurchase agreements	$	25,000			$	—		$	25,000	$	(25,000	)		$	—
	December 31, 2013
	Assets
	Interest rate contracts	$	9,044			$	—		$	9,044	$	—			$	9,044
	Liabilities
	Interest rate contracts	$	9,044			$	—		$	9,044	$	(9,044	)		$	—
	Repurchase agreements	$	25,000			$	—		$	25,000	$	(25,000	)		$	—
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 June 30, 2014 and December 31, 2013:
		Asset Derivatives									Liability Derivatives
		June 30, 2014						December 31, 2013			June 30, 2014						December 31, 2013
		Balance Sheet		Fair Value				Balance Sheet	Fair Value		Balance Sheet		Fair Value				Balance Sheet	Fair Value
		Location						Location			Location						Location
		(in thousands)
	Interest rate contracts	Other assets		$	10,559			Other assets	$	9,044	Other liabilities		$	10,559			Other liabilities	$	9,044

Fair_Value_Accounting_and_Meas1

Fair Value Accounting and Measurement (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Financial Assets And Liabilities Accounted For Fair Value On Recurring Basis	'
	The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at June 30, 2014 and December 31, 2013 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
	June 30, 2014	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	862,618	$	—		$	862,618	$	—
	State and municipal debt securities	380,506		—			380,506		—
	U.S. government agency and government-sponsored enterprise securities	321,389		—			321,389		—
	U.S. government securities	20,337		20,337			—		—
	Other securities	5,167		—			5,167		—
	Total securities available for sale	$	1,590,017	$	20,337		$	1,569,680	$	—
	Other assets (Interest rate contracts)	$	10,559	$	—		$	10,559	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	10,559	$	—		$	10,559	$	—
		Fair value		Fair Value Measurements at Reporting Date Using
				Level 1			Level 2		Level 3
	December 31, 2013	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	948,408	$	—		$	948,408	$	—
	State and municipal debt securities	364,470		—			364,470		—
	U.S. government agency and government-sponsored enterprise securities	326,039		—			326,039		—
	U.S. government securities	20,114		20,114			—		—
	Other securities	5,080		—			5,080		—
	Total securities available for sale	$	1,664,111	$	20,114		$	1,643,997	$	—
	Other assets (Interest rate contracts)	$	9,044	$	—		$	9,044	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	9,044	$	—		$	9,044	$	—
Financial Assets Accounted For Fair Value On Nonrecurring Basis	'
	The following tables set forth the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the three and six month periods ended June 30, 2014 and 2013:
		Fair value at June 30, 2014		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended		Losses During the Six Months Ended
				Level 1			Level 2		Level 3		30-Jun-14		30-Jun-14
		(in thousands)
	Noncovered OREO	$	1,389	$	—		$	—	$	1,389	$	636	$	1,180
	Covered OREO	1,837		—			—		1,837		226		422
		$	3,226	$	—		$	—	$	3,226	$	862	$	1,602
		Fair value at		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended		Losses During the Six Months Ended
		June 30, 2013		Level 1			Level 2		Level 3		30-Jun-13		30-Jun-13
		(in thousands)
	Impaired loans	$	4,198	$	—		$	—	$	4,198	$	656	$	730
	Noncovered OREO	1,965		—			—		1,965		469		500
	Covered OREO	395		—			—		395		29		94
		$	6,558	$	—		$	—	$	6,558	$	1,154	$	1,324
Fair Value, by Balance Sheet Grouping	'
	The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at June 30, 2014 and December 31, 2013:
		June 30, 2014
		Carrying		Fair			Level 1		Level 2		Level 3
		Amount		Value
		(in thousands)
	Assets
	Cash and due from banks	$	193,816	$	193,816		$	193,816	$	—	$	—
	Interest-earning deposits with banks	30,646		30,646			30,646		—		—
	Securities available for sale	1,590,017		1,590,017			20,338		1,569,679		—
	FHLB stock	31,912		31,912			—		31,912		—
	Loans	4,645,280		4,790,933			—		—		4,790,933
	FDIC loss-sharing asset	27,981		9,502			—		—		9,502
	Interest rate contracts	10,559		10,559			—		10,559		—
	Liabilities
	Deposits	$	5,985,069	$	5,983,825		$	5,513,961	$	469,864	$	—
	FHLB Advances	110,587		111,060			—		111,060		—
	Repurchase agreements	25,000		26,231			—		26,231		—
	Interest rate contracts	10,559		10,559			—		10,559		—
		December 31, 2013
		Carrying		Fair			Level 1		Level 2		Level 3
		Amount		Value
		(in thousands)
	Assets
	Cash and due from banks	$	165,030	$	165,030		$	165,030	$	—	$	—
	Interest-earning deposits with banks	14,531		14,531			14,531		—		—
	Securities available for sale	1,664,111		1,664,111			20,114		1,643,997		—
	FHLB stock	32,529		32,529			—		32,529		—
	Loans held for sale	735		735			—		735		—
	Loans	4,444,842		4,605,038			—		—		4,605,038
	FDIC loss-sharing asset	39,846		11,248			—		—		11,248
	Interest rate contracts	9,044		9,044			—		9,044		—
	Liabilities
	Deposits	$	5,959,475	$	5,958,747		$	5,449,546	$	509,201	$	—
	FHLB Advances	36,606		35,080			—		35,080		—
	Repurchase agreements	25,000		26,361			—		26,361		—
	Interest rate contracts	9,044		9,044			—		9,044		—
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 June 30, 2014		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(dollars in thousands)
	Noncovered OREO	$	1,389	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Covered OREO	1,837		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
	(2) Quantitative disclosures are not provided for noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
		Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		June 30, 2013
		(dollars in thousands)
	Impaired loans	$	3,777	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Impaired loans - other collateral (3)	421		Fair Market Value of Collateral		Adjustment to Stated value	(50%) (4)
	Noncovered OREO	1,965		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Covered OREO	395		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
	(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate, noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
	(3) Other collateral consists of accounts receivable and inventory.
	(4) As there was only one impaired loan collateralized by other collateral, a range of discounts could not be provided.

Earnings_per_Common_Share_Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2014
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 six months ended June 30, 2014 and 2013:
			Three Months Ended				Six Months Ended
			June 30,				June 30,
			2014		2013		2014		2013
			(in thousands except per share)
	Basic EPS:
	Net income		$	21,227	$	14,591	$	41,071	$	26,767
	Less: Earnings allocated to participating securities
	Preferred shares		41		29		79		30
	Nonvested restricted shares		206		124		378		244
	Earnings allocated to common shareholders		$	20,980	$	14,438	$	40,614	$	26,493
	Weighted average common shares outstanding		52,088		50,788		51,600		45,099
	Basic earnings per common share		$	0.4	$	0.28	$	0.79	$	0.59
	Diluted EPS:
	Earnings allocated to common shareholders (1)		$	20,981	$	14,441	$	40,617	$	26,495
	Weighted average common shares outstanding		52,088		50,788		51,600		45,099
	Dilutive effect of equity awards		406		1,337		863		659
	Weighted average diluted common shares outstanding		52,494		52,125		52,463		45,758
	Diluted earnings per common share		$	0.4	$	0.28	$	0.77	$	0.58
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive		63		143		73		76
	__________
	-1	Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.

Business_combinations_Details

Business combinations (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 02, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Acquisition [Line Items]	'	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	'	'	'	'
Business Acquisition, Pro Forma Net Income (Loss)	'	'	'	'	$43,256,000
West Coast Bancorp [Member]	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'
Business Acquisition, Effective Date of Acquisition	1-Apr-13	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Purchase Price	540,800,000	'	'	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	312,400,000	'	'	'	'
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits	-1,880,000,000	'	'	'	'
Business Combination, Acquired Receivables, Fair Value	1,410,000,000	'	'	'	'
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	15,300,000	'	'	'	'
Business Acquisition, Purchase Price Allocation, Goodwill Amount	228,400,000	'	'	'	'
Business Acquisition, Pro Forma Revenue	'	'	'	'	177,970,000
Business Acquisition, Pro Forma Earnings Per Share, Basic	'	'	'	'	$0.85
Business Acquisition, Pro Forma Earnings Per Share, Diluted	'	'	'	'	$0.83
Business Combination, Acquisition Related Costs	'	$672,000	$9,200,000	$1,600,000	$10,000,000

Securities_Securities_Availabl

Securities (Securities Available for Sale) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$1,581,989	$1,680,491
Available-for-sale Securities, Gross Unrealized Gain, instant	26,156	22,551
Gross Unrealized Losses	18,128	38,931
Fair Value	1,590,017	1,664,111
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	862,248	961,442
Available-for-sale Securities, Gross Unrealized Gain, instant	11,858	10,640
Gross Unrealized Losses	11,488	23,674
Fair Value	862,618	948,408
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	368,221	357,013
Available-for-sale Securities, Gross Unrealized Gain, instant	13,783	11,450
Gross Unrealized Losses	1,498	3,993
Fair Value	380,506	364,470
U.S. Government and Government-Sponsored Enterprise Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	325,341	335,671
Available-for-sale Securities, Gross Unrealized Gain, instant	492	434
Gross Unrealized Losses	4,444	10,066
Fair Value	321,389	326,039
US Government Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	20,895	21,081
Available-for-sale Securities, Gross Unrealized Gain, instant	1	0
Gross Unrealized Losses	559	967
Fair Value	20,337	20,114
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	5,284	5,284
Available-for-sale Securities, Gross Unrealized Gain, instant	22	27
Gross Unrealized Losses	139	231
Fair Value	$5,167	$5,080

Securities_Schedule_of_Contrac

Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Available-for-sale Securities [Abstract]	'
Due within one year, Amortized Cost	$21,359
Due after one year through five years, Amortized Cost	332,516
Due after five years through ten years, Amortized Cost	431,423
Due after ten years, Amortized Cost	791,407
No stated maturity date, Amortized Cost Basis	5,284
Total investment securities available-for-sale, Amortized Cost	1,581,989
Due within one year, Fair Value	21,470
Due after one year through five years, Fair Value	333,068
Due after five years through ten years, Fair Value	432,434
Due after ten years, Fair Value	797,878
No stated maturity date, Fair Value	5,167
Total investment securities available-for-sale, Fair Value	$1,590,017

Securities_Carrying_Value_of_S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$378,305
Washington and Oregon State Public Deposits [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	291,729
Federal Reserve Bank Advances [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	42,582
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$43,994

Securities_Summary_of_Gross_Un

Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	($26,156)	($22,551)
Less than 12 Months Fair Value	113,296	887,693
Less than 12 Months Unrealized Losses	-263	-23,148
12 Months or More Fair Value	629,451	166,348
12 Months or More Unrealized Losses	-17,865	-15,783
Total Fair Value	742,747	1,054,041
Total Unrealized Losses	-18,128	-38,931
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-18,128	-38,931
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-11,858	-10,640
Less than 12 Months Fair Value	70,725	492,921
Less than 12 Months Unrealized Losses	-160	-10,991
12 Months or More Fair Value	296,832	121,303
12 Months or More Unrealized Losses	-11,328	-12,684
Total Fair Value	367,557	614,224
Total Unrealized Losses	-11,488	-23,675
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-11,488	-23,674
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-13,783	-11,450
Less than 12 Months Fair Value	26,340	112,400
Less than 12 Months Unrealized Losses	-101	-3,069
12 Months or More Fair Value	61,424	13,815
12 Months or More Unrealized Losses	-1,397	-923
Total Fair Value	87,764	126,215
Total Unrealized Losses	-1,498	-3,992
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-1,498	-3,993
US Government Corporations and Agencies Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-492	-434
Less than 12 Months Fair Value	16,231	260,001
Less than 12 Months Unrealized Losses	-2	-8,063
12 Months or More Fair Value	246,776	28,447
12 Months or More Unrealized Losses	-4,442	-2,003
Total Fair Value	263,007	288,448
Total Unrealized Losses	-4,444	-10,066
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-4,444	-10,066
US Government Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-1	0
Less than 12 Months Fair Value	0	20,114
Less than 12 Months Unrealized Losses	0	-967
12 Months or More Fair Value	19,288	0
12 Months or More Unrealized Losses	-559	0
Total Fair Value	19,288	20,114
Total Unrealized Losses	-559	-967
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-559	-967
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-22	-27
Less than 12 Months Fair Value	0	2,257
Less than 12 Months Unrealized Losses	0	-58
12 Months or More Fair Value	5,131	2,783
12 Months or More Unrealized Losses	-139	-173
Total Fair Value	5,131	5,040
Total Unrealized Losses	-139	-231
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	($139)	($231)

Securities_Narrative_Details

Securities (Narrative) (Details)	Jun. 30, 2014
	security
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	54
Number Of Securities In Continuous Loss Position For Twelve Months or More	45
Municipal Bonds [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	88
Number Of Securities In Continuous Loss Position For Twelve Months or More	64
U.S. Government and Government-Sponsored Enterprise Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	27
Number Of Securities In Continuous Loss Position For Twelve Months or More	22
US Government Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	2
Number Of Securities In Continuous Loss Position For Twelve Months or More	2
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	2
Number Of Securities In Continuous Loss Position For Twelve Months or More	2

Noncovered_Loans_Narrative_Det

Noncovered Loans (Narrative) (Details) (USD $)	6 Months Ended					3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	contract			Loans Receivable [Member]	Loans Receivable [Member]	Covered Loans [Member]	Covered Loans [Member]	Covered Loans [Member]	Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'	'	'	'
Provision for loan and lease losses	$4,039,000	$268,000	'	'	'	$1,517,000	($1,712,000)	$3,939,000	($732,000)
Loans to related parties	11,600,000	'	14,200,000	'	'	'	'	'	'
Loans and Leases Receivable, Related Parties, Additions	1,100,000	'	'	'	'	'	'	'	'
Repayments on related party loans	3,700,000	'	'	'	'	'	'	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	'	'	'	1,070,000,000	1,080,000,000	'	'	'	'
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	'	'	'	43,900,000	45,200,000	'	'	'	'
Additional funds committed to lend on loans classified as TDR	$269,000	'	$0	'	'	'	'	'	'
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	'	'	'	'	'	'	'	'

Noncovered_Loans_Analysis_of_L

Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	$57,126	'	$68,282	'	'	'
Loans, net	4,645,280	'	4,444,842	'	'	'
Loans held for sale	750	'	735	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	57,126	'	68,282	'	'	'
Recorded Investment	4,452,674	'	4,219,451	'	'	'
Allowance for loan losses	49,494	50,442	52,280	51,698	51,119	52,244
Loans, net	4,403,180	'	4,167,171	'	'	'
Loans held for sale	750	'	735	'	'	'
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	102,632	'	108,317	'	'	'
Loans and Leases Receivable, Gross, Consumer, Construction	61,481	'	54,155	'	'	'
Allowance for loan losses	1,083	1,194	1,252	672	657	694
Commercial and Multifamily Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial, Mortgage	2,127,520	'	2,080,075	'	'	'
Loans Receivable, Gross, Commercial, Construction	134,140	'	126,390	'	'	'
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial and Industrial	1,735,588	'	1,561,782	'	'	'
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Mortgage	2,230,152	'	2,188,392	'	'	'
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Construction	195,621	'	180,545	'	'	'
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer	348,439	'	357,014	'	'	'
Allowance for loan losses	$2,643	$2,637	$2,547	$2,455	$2,364	$2,437

Noncovered_Loans_Analysis_of_N

Noncovered Loans (Analysis of Nonaccrual Loans) (Details) (Noncovered Loans [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	$30,613	$34,015
Unpaid Principal Balance Nonaccrual Loans	46,671	52,434
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	4,026	3,991
Unpaid Principal Balance Nonaccrual Loans	5,758	6,187
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	11,190	12,433
Unpaid Principal Balance Nonaccrual Loans	15,739	19,186
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	294	176
Unpaid Principal Balance Nonaccrual Loans	326	202
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,024	2,667
Unpaid Principal Balance Nonaccrual Loans	5,125	4,678
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	658	442
Unpaid Principal Balance Nonaccrual Loans	998	783
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	5,062	4,267
Unpaid Principal Balance Nonaccrual Loans	7,648	5,383
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	5,319	6,334
Unpaid Principal Balance Nonaccrual Loans	7,388	7,486
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	581	3,246
Unpaid Principal Balance Nonaccrual Loans	1,761	6,601
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	459	459
Unpaid Principal Balance Nonaccrual Loans	$1,928	$1,928

Noncovered_Loans_Analysis_of_t

Noncovered Loans (Analysis of the Aged Loan Portfolio) (Details) (Noncovered Loans [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	$4,408,712	$4,158,873
30 - 59 Days Past Due	7,459	20,754
60 - 89 Days Past Due	5,890	5,809
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	13,349	26,563
Nonaccrual Loans	30,613	34,015
Loans Receivable, Net	4,452,674	4,219,451
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	319,958	322,685
30 - 59 Days Past Due	717	835
60 - 89 Days Past Due	67	823
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	784	1,658
Nonaccrual Loans	4,026	3,991
Loans Receivable, Net	324,768	328,334
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,640,938	1,457,820
30 - 59 Days Past Due	3,046	12,713
60 - 89 Days Past Due	2,602	681
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	5,648	13,394
Nonaccrual Loans	11,190	12,433
Loans Receivable, Net	1,657,776	1,483,647
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	72,749	72,255
30 - 59 Days Past Due	142	156
60 - 89 Days Past Due	67	17
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	209	173
Nonaccrual Loans	294	176
Loans Receivable, Net	73,252	72,604
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	95,653	100,591
30 - 59 Days Past Due	1,415	1,993
60 - 89 Days Past Due	570	641
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	1,985	2,634
Nonaccrual Loans	3,024	2,667
Loans Receivable, Net	100,662	105,892
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	148,163	142,034
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	358
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	0	358
Nonaccrual Loans	658	442
Loans Receivable, Net	148,821	142,834
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,191,882	1,138,732
30 - 59 Days Past Due	1,336	144
60 - 89 Days Past Due	9	3,289
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	1,345	3,433
Nonaccrual Loans	5,062	4,267
Loans Receivable, Net	1,198,289	1,146,432
Owner Occupied Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	45,951	38,916
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	45,951	38,916
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	746,217	749,561
30 - 59 Days Past Due	410	4,714
60 - 89 Days Past Due	2,575	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	2,985	4,714
Nonaccrual Loans	5,319	6,334
Loans Receivable, Net	754,521	760,609
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	10,899	8,225
30 - 59 Days Past Due	0	199
60 - 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	0	199
Nonaccrual Loans	581	3,246
Loans Receivable, Net	11,480	11,670
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	48,699	41,533
30 - 59 Days Past Due	393	0
60 - 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	393	0
Nonaccrual Loans	459	459
Loans Receivable, Net	49,551	41,992
Income Property Multifamily Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	87,603	86,521
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	0	0
Nonaccrual Loans	0	0
Loans Receivable, Net	$87,603	$86,521

Noncovered_Loans_Analysis_of_I

Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	$4,426,620	'	$4,426,620	'	$4,193,062
Recorded Investment of Loans Individually Measured for Specific Impairment	26,054	'	26,054	'	26,389
Recorded Investment	20	'	20	'	23
Unpaid Principal Balance	26	'	26	'	27
Related Allowance	1	'	1	'	4
Average Recorded Investment Impaired Loans	26,371	34,989	26,377	34,881	'
Interest Recognized on Impaired Loans	341	398	677	717	'
Income Property Multifamily Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	87,603	'	87,603	'	86,521
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
Consumer Portfolio Segment [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	324,616	'	324,616	'	328,167
Recorded Investment of Loans Individually Measured for Specific Impairment	152	'	152	'	167
Average Recorded Investment Impaired Loans	155	425	159	326	'
Interest Recognized on Impaired Loans	3	2	5	3	'
Residential Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	49,551	'	49,551	'	41,992
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	72	0	701	'
Interest Recognized on Impaired Loans	0	0	0	0	'
Land And Acquisition [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	11,368	'	11,368	'	9,726
Recorded Investment of Loans Individually Measured for Specific Impairment	112	'	112	'	1,944
Recorded Investment	112	'	112	'	113
Unpaid Principal Balance	111	'	111	'	113
Related Allowance	69	'	69	'	71
Average Recorded Investment Impaired Loans	653	2,931	1,083	2,894	'
Interest Recognized on Impaired Loans	1	1	3	3	'
Owner Occupied [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	745,351	'	745,351	'	749,601
Recorded Investment of Loans Individually Measured for Specific Impairment	9,170	'	9,170	'	11,008
Recorded Investment	588	'	588	'	3,802
Unpaid Principal Balance	588	'	588	'	3,817
Related Allowance	35	'	35	'	1,073
Average Recorded Investment Impaired Loans	9,222	10,437	9,817	10,926	'
Interest Recognized on Impaired Loans	235	230	476	510	'
Owner Occupied Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	45,951	'	45,951	'	38,916
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
Income Property Multifamily [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,190,323	'	1,190,323	'	1,140,019
Recorded Investment of Loans Individually Measured for Specific Impairment	7,966	'	7,966	'	6,413
Recorded Investment	0	'	0	'	918
Unpaid Principal Balance	0	'	0	'	933
Related Allowance	0	'	0	'	26
Average Recorded Investment Impaired Loans	7,213	10,478	6,946	9,704	'
Interest Recognized on Impaired Loans	74	133	136	161	'
Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	148,722	'	148,722	'	142,719
Recorded Investment of Loans Individually Measured for Specific Impairment	99	'	99	'	115
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Related Allowance	0	'	0	'	0
Average Recorded Investment Impaired Loans	103	2,559	107	2,591	'
Interest Recognized on Impaired Loans	0	0	0	0	'
One-to-Four Family Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	98,616	'	98,616	'	104,272
Recorded Investment of Loans Individually Measured for Specific Impairment	2,046	'	2,046	'	1,620
Recorded Investment	432	'	432	'	442
Unpaid Principal Balance	472	'	472	'	479
Related Allowance	128	'	128	'	138
Average Recorded Investment Impaired Loans	2,069	1,538	1,920	1,722	'
Interest Recognized on Impaired Loans	11	27	23	31	'
Unsecured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	73,233	'	73,233	'	72,569
Recorded Investment of Loans Individually Measured for Specific Impairment	19	'	19	'	35
Recorded Investment	19	'	19	'	35
Unpaid Principal Balance	19	'	19	'	35
Related Allowance	19	'	19	'	35
Average Recorded Investment Impaired Loans	23	68	27	76	'
Interest Recognized on Impaired Loans	0	1	1	1	'
Secured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,651,286	'	1,651,286	'	1,478,560
Recorded Investment of Loans Individually Measured for Specific Impairment	6,490	'	6,490	'	5,087
Recorded Investment	1,332	'	1,332	'	2,866
Unpaid Principal Balance	2,450	'	2,450	'	2,885
Related Allowance	128	'	128	'	343
Average Recorded Investment Impaired Loans	6,933	6,481	6,318	5,941	'
Interest Recognized on Impaired Loans	17	4	33	8	'
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	23,551	'	23,551	'	18,190
Unpaid Principal Balance	34,858	'	34,858	'	26,223
Impaired Loans With Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	2,503	'	2,503	'	8,199
Unpaid Principal Balance	3,666	'	3,666	'	8,289
Related Allowance	380	'	380	'	1,690
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	132	'	132	'	144
Unpaid Principal Balance	199	'	199	'	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] | Residential 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] | Land And Acquisition [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	0	'	0	'	1,831
Unpaid Principal Balance	0	'	0	'	2,587
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	8,582	'	8,582	'	7,206
Unpaid Principal Balance	13,020	'	13,020	'	10,464
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied 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] | Income Property Multifamily [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	7,966	'	7,966	'	5,495
Unpaid Principal Balance	12,518	'	12,518	'	7,885
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	99	'	99	'	115
Unpaid Principal Balance	398	'	398	'	398
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	1,614	'	1,614	'	1,178
Unpaid Principal Balance	2,794	'	2,794	'	2,119
Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	5,158	'	5,158	'	2,221
Unpaid Principal Balance	$5,929	'	$5,929	'	$2,560

Noncovered_Loans_Noncovered_Lo

Noncovered Loans Noncovered Loans (Analysis of Troubled Debt Restructurings) (Details) (Noncovered Loans [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Modifications	Modifications	Modifications	Modifications
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	2	6	7	7
Pre-Modification Outstanding Recorded Investment	$546	$1,595	$1,396	$1,712
Post-Modification Outstanding Recorded Investment	546	1,595	1,379	1,712
Secured Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	2	1	4	1
Pre-Modification Outstanding Recorded Investment	546	343	759	343
Post-Modification Outstanding Recorded Investment	546	343	759	343
One-to-Four Family Residential [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	'	'	2	0
Pre-Modification Outstanding Recorded Investment	'	'	494	0
Post-Modification Outstanding Recorded Investment	'	'	494	0
Commercial Land [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	0	1	0	1
Pre-Modification Outstanding Recorded Investment	0	137	0	137
Post-Modification Outstanding Recorded Investment	0	137	0	137
Income Property Multifamily [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	0	3	1	3
Pre-Modification Outstanding Recorded Investment	0	943	143	943
Post-Modification Outstanding Recorded Investment	0	943	126	943
Owner Occupied [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	0	1	0	1
Pre-Modification Outstanding Recorded Investment	0	172	0	172
Post-Modification Outstanding Recorded Investment	0	172	0	172
Land And Acquisition [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	'	'	0	1
Pre-Modification Outstanding Recorded Investment	'	'	0	117
Post-Modification Outstanding Recorded Investment	'	'	$0	$117

Allowance_for_Noncovered_Loan_2

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision for loan and lease losses	'	'	$4,039	$268
Maximum [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Percentage of unallocated loan amount	'	'	5.00%	'
Noncovered Loans [Member]	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision for loan and lease losses	$600	$2,000	$100	$1,000

Allowance_for_Noncovered_Loan_3

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Provision for loan and lease losses	'	'	$4,039	$268
Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	50,442	51,119	52,280	52,244
Charged-offs	-4,589	-2,241	-6,779	-4,758
Recoveries	3,041	820	3,893	3,212
Provision for loan and lease losses	600	2,000	100	1,000
Ending balance	49,494	51,698	49,494	51,698
Specific Reserve	380	839	380	839
General Allocation	49,114	50,859	49,114	50,859
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	2,637	2,364	2,547	2,437
Charged-offs	-909	-638	-1,636	-809
Recoveries	338	194	591	241
Provision for loan and lease losses	577	535	1,141	586
Ending balance	2,643	2,455	2,643	2,455
Specific Reserve	1	0	1	0
General Allocation	2,642	2,455	2,642	2,455
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	68	3,157	1,655	1,011
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	1,799	-2,174	212	-28
Ending balance	1,867	983	1,867	983
Specific Reserve	0	0	0	0
General Allocation	1,867	983	1,867	983
Secured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	28,801	26,871	31,027	27,270
Charged-offs	-1,642	-856	-1,840	-1,844
Recoveries	1,435	312	1,883	392
Provision for loan and lease losses	-3,077	4,245	-5,553	4,754
Ending balance	25,517	30,572	25,517	30,572
Specific Reserve	128	242	128	242
General Allocation	25,389	30,330	25,389	30,330
Unsecured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	746	750	696	753
Charged-offs	-75	-105	-110	-431
Recoveries	277	40	319	73
Provision for loan and lease losses	-194	136	-151	426
Ending balance	754	821	754	821
Specific Reserve	19	51	19	51
General Allocation	735	770	735	770
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	1,194	657	1,252	694
Charged-offs	0	-28	-207	-144
Recoveries	12	141	40	141
Provision for loan and lease losses	-123	-98	-2	-19
Ending balance	1,083	672	1,083	672
Specific Reserve	128	105	128	105
General Allocation	955	567	955	567
Commercial Land [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	579	433	489	460
Charged-offs	-29	-11	-29	-11
Recoveries	2	17	19	27
Provision for loan and lease losses	-82	252	-9	215
Ending balance	470	691	470	691
Specific Reserve	0	262	0	262
General Allocation	470	429	470	429
Income Property Multifamily [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	10,107	9,411	9,234	11,033
Charged-offs	-1,934	-35	-1,934	-818
Recoveries	505	27	518	106
Provision for loan and lease losses	1,833	292	2,693	-626
Ending balance	10,511	9,695	10,511	9,695
Specific Reserve	0	76	0	76
General Allocation	10,511	9,619	10,511	9,619
Owner Occupied [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	4,560	5,458	3,605	6,362
Charged-offs	0	-568	-1,023	-568
Recoveries	30	40	39	44
Provision for loan and lease losses	399	-415	2,368	-1,323
Ending balance	4,989	4,515	4,989	4,515
Specific Reserve	35	30	35	30
General Allocation	4,954	4,485	4,954	4,485
Land And Acquisition [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	580	990	610	1,171
Charged-offs	0	0	0	-32
Recoveries	2	35	41	2,174
Provision for loan and lease losses	-179	-256	-248	-2,544
Ending balance	403	769	403	769
Specific Reserve	69	73	69	73
General Allocation	334	696	334	696
Residential Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	696	538	822	635
Charged-offs	0	0	0	-101
Recoveries	440	14	443	14
Provision for loan and lease losses	-459	-348	-588	-344
Ending balance	677	204	677	204
Specific Reserve	0	0	0	0
General Allocation	677	204	677	204
Income Property Multifamily Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	320	382	285	316
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	94	-141	129	-75
Ending balance	414	241	414	241
Specific Reserve	0	0	0	0
General Allocation	414	241	414	241
Owner Occupied Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	154	108	58	102
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	12	-28	108	-22
Ending balance	166	80	166	80
Specific Reserve	0	0	0	0
General Allocation	$166	$80	$166	$80

Allowance_for_Noncovered_Loan_4

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Changes in the Allowance for Unfunded Commitments and Letters of Credit) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit	'	'	'	'
Beginning balance	$2,455	$1,915	$2,505	$1,915
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	-100	550	-150	550
Ending balance	$2,355	$2,465	$2,355	$2,465

Allowance_for_Noncovered_Loan_5

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of Noncovered Loan Portfolio) (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans, net	$4,645,280	'	$4,444,842	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,452,674	'	4,219,451	'	'	'
Recorded Investment	4,452,674	'	4,219,451	'	'	'
Loans and Leases Receivable, Allowance	49,494	50,442	52,280	51,698	51,119	52,244
Loans, net	4,403,180	'	4,167,171	'	'	'
Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,311,107	'	4,027,764	'	'	'
Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	49,588	'	53,231	'	'	'
Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	91,979	'	137,989	'	'	'
Doubtful [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	467	'	'	'
Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	324,768	'	328,334	'	'	'
Loans and Leases Receivable, Allowance	2,643	2,637	2,547	2,455	2,364	2,437
Consumer Portfolio Segment [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	319,518	'	321,348	'	'	'
Consumer Portfolio Segment [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	5	'	331	'	'	'
Consumer Portfolio Segment [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	5,245	'	6,188	'	'	'
Consumer Portfolio Segment [Member] | Doubtful [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	467	'	'	'
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Secured Loans [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,657,776	'	1,483,647	'	'	'
Loans and Leases Receivable, Allowance	25,517	28,801	31,027	30,572	26,871	27,270
Secured Loans [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,572,391	'	1,372,038	'	'	'
Secured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	41,465	'	43,309	'	'	'
Secured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	43,920	'	68,300	'	'	'
Secured Loans [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Unsecured Loans [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	73,252	'	72,604	'	'	'
Loans and Leases Receivable, Allowance	754	746	696	821	750	753
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	72,825	'	72,226	'	'	'
Unsecured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	199	'	199	'	'	'
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	228	'	179	'	'	'
Unsecured Loans [Member] | Doubtful [Member] | Noncovered 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] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	100,662	'	105,892	'	'	'
Loans and Leases Receivable, Allowance	1,083	1,194	1,252	672	657	694
One-to-Four Family Residential [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	95,647	'	98,626	'	'	'
One-to-Four Family Residential [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	55	'	1,567	'	'	'
One-to-Four Family Residential [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,960	'	5,699	'	'	'
One-to-Four Family Residential [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Commercial Land [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	148,821	'	142,834	'	'	'
Loans and Leases Receivable, Allowance	470	579	489	691	433	460
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	145,901	'	137,850	'	'	'
Commercial Land [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Commercial Land [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,920	'	4,984	'	'	'
Commercial Land [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,198,289	'	1,146,432	'	'	'
Loans and Leases Receivable, Allowance	10,511	10,107	9,234	9,695	9,411	11,033
Income Property Multifamily [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,173,006	'	1,108,033	'	'	'
Income Property Multifamily [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,455	'	5,473	'	'	'
Income Property Multifamily [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	20,828	'	32,926	'	'	'
Income Property Multifamily [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	754,521	'	760,609	'	'	'
Loans and Leases Receivable, Allowance	4,989	4,560	3,605	4,515	5,458	6,362
Owner Occupied [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	742,585	'	748,725	'	'	'
Owner Occupied [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,996	'	0	'	'	'
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	8,940	'	11,884	'	'	'
Owner Occupied [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Land And Acquisition [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	11,480	'	11,670	'	'	'
Loans and Leases Receivable, Allowance	403	580	610	769	990	1,171
Land And Acquisition [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	9,758	'	7,526	'	'	'
Land And Acquisition [Member] | Special Mention [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,722	'	4,144	'	'	'
Land And Acquisition [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Residential Construction [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	49,551	'	41,992	'	'	'
Loans and Leases Receivable, Allowance	677	696	822	204	538	635
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	46,335	'	36,270	'	'	'
Residential Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	2,352	'	'	'
Residential Construction [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,216	'	3,370	'	'	'
Residential Construction [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily Construction [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	87,603	'	86,521	'	'	'
Loans and Leases Receivable, Allowance	414	320	285	241	382	316
Income Property Multifamily Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	87,603	'	86,206	'	'	'
Income Property Multifamily Construction [Member] | Special Mention [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	315	'	'	'
Income Property Multifamily Construction [Member] | Doubtful [Member] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied Construction [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	45,951	'	38,916	'	'	'
Loans and Leases Receivable, Allowance	166	154	58	80	108	102
Owner Occupied Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	45,538	'	38,916	'	'	'
Owner Occupied Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	413	'	0	'	'	'
Owner Occupied Construction [Member] | Substandard [Member] | Noncovered 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] | Noncovered 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] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	$0	'	$0	'	'	'

Changes_in_Noncovered_Other_Re2

Changes in Noncovered Other Real Estate Owned (Summary of Noncovered Other Real Estate Owned) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Real Estate Owned [Line Items]	'	'	'	'
Other Real Estate Owned, established through acquisition	$0	$14,708	$0	$14,708
Balance, beginning of period	'	'	35,927	'
Proceeds from sale of OREO property	'	'	-10,298	-6,076
Gain (loss) on sale of OREO	'	'	2,972	6,291
Total OREO, end of period	28,254	'	28,254	'
Noncovered Loans [Member]	'	'	'	'
Other Real Estate Owned [Line Items]	'	'	'	'
Balance, beginning of period	15,841	11,916	23,834	10,676
Transfers in, net of write-downs ($0, $11, $0 and $43, respectively)	2,090	2,067	2,334	4,777
Transfers in, write-downs	0	11	0	43
Additional OREO write-down	-636	-477	-1,565	-570
Proceeds from sale of OREO property	-2,196	-4,057	-10,298	-5,622
Gain (loss) on sale of OREO	104	182	898	370
Total OREO, end of period	$15,203	$24,339	$15,203	$24,339

Covered_Assets_and_FDIC_Losssh2

Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Amount of Estimated Clawback Liability	$4,000,000	'	$4,000,000	'
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition	'	'	'10 years 45 days	'
Provision for loan and lease losses	'	'	4,039,000	268,000
Federal deposit insurance corporation loss-sharing indemnified assets	25,000,000	'	25,000,000	'
Federal deposit insurance corporation loss-sharing indemnified assets receivable	2,900,000	'	2,900,000	'
FDIC Loss-sharing Asset, Period Increase (Decrease)	1,200,000	'	'	'
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Percentage of loss shared by FDIC	80.00%	'	80.00%	'
FDIC Percentage Of Loss Recoveries	80.00%	'	80.00%	'
Percentage of loss shared by FDIC When Loss Share Thresholds Met	95.00%	'	95.00%	'
Percentage Of Loss Recoveries Shared By FDIC When Loss Share Thresholds Met	95.00%	'	95.00%	'
Provision for loan and lease losses	1,517,000	-1,712,000	3,939,000	-732,000
Impairment expenses	'	'	1,700,000	'
Negative provision to adjust allowance for loss	'	'	$200,000	'
Covered Loans [Member] | Maximum [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Loss Sharing Agreement Effective Years	'	'	'10 years	'
Loss Recovery Provision Effective Years	'	'	'10 years	'
Covered Loans [Member] | Minimum [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Loss Sharing Agreement Effective Years	'	'	'5 years	'
Loss Recovery Provision Effective Years	'	'	'8 years	'

Covered_Assets_and_FDIC_Losssh3

Covered Assets and FDIC Loss-sharing Asset (Analysis of Covered Loans) (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans, net	$4,645,280	'	$4,444,842	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	294,872	'	341,142	'	'	'
Valuation discount on covered loans	32,971	'	43,297	'	'	'
Allowance for loan losses	19,801	20,129	20,174	26,135	29,489	30,056
Loans, net	242,100	'	277,671	'	'	'
Commercial Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	60,287	'	72,870	'	'	'
Real Estate Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	190,476	'	212,521	'	'	'
One-to-Four Family Residential Construction [Domain] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	9,444	'	14,781	'	'	'
Commercial and Multifamily Residential Construction [Domain] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,910	'	6,869	'	'	'
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	13,354	'	21,650	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	30,755	'	34,101	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	36,711	'	41,642	'	'	'
Commercial and Multifamily Residential [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	$153,765	'	$170,879	'	'	'

Covered_Assets_and_FDIC_Losssh4

Covered Assets and FDIC Loss-sharing Asset (Changes in Accretable Yield for Acquired Loans) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$101,543	$158,786	$103,907	$166,888
Accretion	-10,055	-13,520	-20,624	-27,997
Disposals	0	-1,998	-2,826	5,151
Reclassifications (to) from nonaccretable difference	1,023	-2,757	12,054	-3,531
Balance at end of period	$92,511	$140,511	$92,511	$140,511

Covered_Assets_and_FDIC_Losssh5

Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Provision for loan and lease losses	'	'	$4,039	$268
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Beginning balance	20,129	29,489	20,174	30,056
Loans charged off	-3,842	-2,642	-8,115	-5,024
Recoveries	1,997	1,000	3,803	1,835
Provision for loan and lease losses	1,517	-1,712	3,939	-732
Ending balance	$19,801	$26,135	$19,801	$26,135

Covered_Assets_and_FDIC_Losssh6

Covered Assets and FDIC Loss-sharing Asset (Covered OREO at Carrying Value) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	'	'	$35,927	'
Proceeds from sale of OREO property	'	'	-10,298	-6,076
Gain on sale of OREO	'	'	2,972	6,291
Total OREO, end of period	28,254	'	28,254	'
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	14,712	13,811	12,093	16,311
Transfers in	0	3,125	5,507	4,530
Additional OREO write-down	-338	-29	-989	-94
Proceeds from sale of OREO property	-2,530	-7,376	-5,634	-13,814
Gain on sale of OREO	1,207	3,323	2,074	5,921
Total OREO, end of period	$13,051	$12,854	$13,051	$12,854

Covered_Assets_and_FDIC_Losssh7

Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$36,837	$83,115	$39,846	$96,354
Cash received from the FDIC	-3,442	-3,268	-1,765	-6,387
FDIC reimbursable losses, net	-364	664	-231	1,027
Amortization, net	-5,764	-9,801	-12,216	-19,580
Impairment	1,214	-1,370	3,151	-585
Sale of other real estate	-965	-2,251	-1,721	-3,597
Write-downs of other real estate	276	102	792	154
Other	189	183	125	-12
Balance at end of period	$27,981	$67,374	$27,981	$67,374

Covered_Assets_and_FDIC_Losssh8

Covered Assets and FDIC Loss-sharing Asset Covered Loans - Credit Quality Indicator (Details) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Net Reported Amount	$4,645,280	'	$4,444,842	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	294,872	'	341,142	'	'	'
Valuation discount on covered loans	32,971	'	43,297	'	'	'
Loans and Leases Receivable, Allowance	19,801	20,129	20,174	26,135	29,489	30,056
Loans and Leases Receivable, Net Reported Amount	242,100	'	277,671	'	'	'
Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	239,010	'	264,008	'	'	'
Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,733	'	12,118	'	'	'
Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	51,122	'	64,989	'	'	'
Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7	'	27	'	'	'
Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Commercial Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	60,287	'	72,870	'	'	'
Real Estate Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	190,476	'	212,521	'	'	'
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	13,354	'	21,650	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	30,755	'	34,101	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	27,531	'	30,722	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	33	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,224	'	3,319	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	27	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Secured Loans [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	58,017	'	69,650	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	42,653	'	48,510	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,151	'	2,849	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	14,206	'	18,291	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7	'	0	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Unsecured Loans [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,270	'	3,220	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,168	'	2,732	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	396	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	102	'	92	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	36,711	'	41,642	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	31,618	'	35,066	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	1,842	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	5,093	'	4,734	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Commercial Land [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	17,663	'	18,565	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	10,410	'	10,778	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	198	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7,253	'	7,589	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	67,773	'	70,592	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	56,858	'	55,985	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,220	'	3,950	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7,695	'	10,657	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	68,329	'	81,722	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	61,344	'	67,653	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	362	'	111	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	6,623	'	13,958	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Land And Acquisition [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,994	'	9,349	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,589	'	4,674	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	2,739	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,405	'	1,936	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Residential Construction [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,450	'	5,432	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	420	'	3,008	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,030	'	2,424	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,969	'	5,515	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,478	'	3,806	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,491	'	1,709	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	941	'	1,354	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	941	'	1,074	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	280	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	$0	'	$0	'	'	'

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Goodwill, Acquired During Period	$0	$228,398	$0	$228,398	'	'	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	919	913	919	913	'	'	'	'
Intangible Assets, Net (Excluding Goodwill)	22,792	29,170	22,792	29,170	'	25,852	'	'
Goodwill and Intangible Assets [Roll Forward]	'	'	'	'	'	'	'	'
Total goodwill, beginning of period	'	'	343,952	115,554	'	'	'	'
Total goodwill, end of period	343,952	343,952	343,952	343,952	'	'	'	'
CDI current period amortization	-1,480	-1,693	-3,060	-2,722	'	'	'	'
Total goodwill and intangible assets, end of period	366,744	373,122	366,744	373,122	'	'	'	'
Core Deposits [Member]	'	'	'	'	'	'	'	'
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Finite Lived Intangible Assets Acquired During the Period	0	15,257	0	15,257	'	'	'	'
Estimated life of CDI, in years	'	'	'10 years	'	'	'	'	'
Goodwill and Intangible Assets [Roll Forward]	'	'	'	'	'	'	'	'
Gross core deposit intangible balance, beginning of period	'	'	'	'	47,698	47,698	32,441	32,441
Accumulated amortization at beginning of period	'	'	'	'	-24,344	-22,765	-17,748	-16,720
Core deposit intangible, net, beginning of period	23,354	14,693	24,933	15,721	'	'	'	'
CDI current period amortization	-1,481	-1,693	-3,060	-2,721	'	'	'	'
Total core deposit intangible, end of period	$21,873	$28,257	$21,873	$28,257	'	'	'	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Future Amortization Expense For Core Deposit Intangibles	'
2014	$2,903
2015	4,934
2016	4,195
2017	3,361
2018	$2,500

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)	0 Months Ended		6 Months Ended		0 Months Ended
In Millions, except Share data, unless otherwise specified	Apr. 23, 2014	Jan. 23, 2014	Jun. 30, 2014	Apr. 02, 2013	Jul. 23, 2014	Apr. 02, 2013
					Dividend Declared [Member]	Preferred Stock [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	'	'	'	'	8,782
Preferred Stock Converted Into Common Stock, Shares	'	'	102,363	'	'	'
Declared quarterly cash dividend	$0.12	$0.12	'	'	$0.14	'
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	'	'	582,799	'	'	'
Class of Warrant or Right, Exercise Price of Warrants or Rights	'	'	'	8.58	'	'
Warrants and Rights Outstanding	'	'	$5	'	'	'
Warrant activity, gross shares	'	'	1,631,840	'	'	'
Warrant Activity, Net Shares	'	'	1,139,698	'	'	'
Special Dividends Payable, Amount Per Share	$0.12	'	'	'	$0.14	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	($5,043)	[1]	$16,719	[1]	($12,044)	[1]	$20,149	[1]
Other comprehensive income before reclassifications	8,768	[1]	-25,930	[1]	15,887	[1]	-29,179	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	-165	[1],[2]	1	[1],[2]	-283	[1],[2]	-180	[1],[2]
Net current-period other comprehensive income	8,603	[1]	-25,929	[1]	15,604	[1]	-29,359	[1]
Ending balance	3,560	[1]	-9,210	[1]	3,560	[1]	-9,210	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	-3,131	[1]	18,185	[1]	-10,108	[1]	20,918	[1]
Other comprehensive income before reclassifications	8,768	[1]	-25,930	[1]	15,887	[1]	-28,423	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	-189	[1],[2]	-59	[1],[2]	-331	[1],[2]	-299	[1],[2]
Net current-period other comprehensive income	8,579	[1]	-25,989	[1]	15,556	[1]	-28,722	[1]
Ending balance	5,448	[1]	-7,804	[1]	5,448	[1]	-7,804	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	-1,912	[1]	-1,466	[1]	-1,936	[1]	-769	[1]
Other comprehensive income before reclassifications	0	[1]	0	[1]	0	[1]	-756	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	24	[1],[2]	60	[1],[2]	48	[1],[2]	119	[1],[2]
Net current-period other comprehensive income	24	[1]	60	[1]	48	[1]	-637	[1]
Ending balance	($1,888)	[1]	($1,406)	[1]	($1,888)	[1]	($1,406)	[1]
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.
[2]	See following table for details about these reclassifications.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Investment securities gains, net	$296	$92	$519	$462
Compensation and employee benefits	31,064	35,657	62,402	57,310
Total before tax	29,870	22,005	58,510	39,116
Income tax provision	-8,643	-7,414	-17,439	-12,349
Net of tax	21,227	14,591	41,071	26,767
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	296	92	519	462
Total before tax	296	92	519	462
Income tax provision	-107	-33	-188	-163
Net of tax	189	59	331	299
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	-37	-92	-74	-184
Total before tax	-37	-92	-74	-184
Income tax provision	13	32	26	65
Net of tax	($24)	($60)	($48)	($119)

Derivatives_and_Balance_Sheet_2

Derivatives and Balance Sheet Offsetting (Details) (Not Designated as Hedging Instrument [Member], Interest Rate Contracts [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'
Derivative, Notional Amount	$208,300,000	$179,500,000
Other Assets [Member]	'	'
Derivative [Line Items]	'	'
Fair value of asset derivative instruments	10,559,000	9,044,000
Other Liabilities [Member]	'	'
Derivative [Line Items]	'	'
Fair value of liability derivative instruments	$10,559,000	$9,044,000

Derivatives_and_Balance_Sheet_3

Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance Sheet Offsetting [Line Items]	'	'
Repurchase agreements, amounts offset in balance sheet	$0	$0
Repurchase agreements, net amount presented in statement of financial position	25,000	25,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	-25,000	-25,000
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	10,559	9,044
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	10,559	9,044
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	10,559	9,044
Derivative, Collateral, Right to Reclaim Securities	-10,559	-9,044
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Assets [Member]	'	'
Balance Sheet Offsetting [Line Items]	'	'
Fair value of asset derivative instruments	10,559	9,044
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]	'	'
Balance Sheet Offsetting [Line Items]	'	'
Fair value of liability derivative instruments	10,559	9,044
Available-for-sale Securities [Member]	'	'
Balance Sheet Offsetting [Line Items]	'	'
Securities Sold under Agreements to Repurchase, Gross	$25,000	$25,000

Fair_Value_Accounting_and_Meas2

Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	$1,590,017	$1,664,111
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	1,590,017	1,664,111
Other assets (Interest rate contracts)	10,559	9,044
Other liabilities (Interest rate contracts)	10,559	9,044
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	20,337	20,114
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	1,569,680	1,643,997
Other assets (Interest rate contracts)	10,559	9,044
Other liabilities (Interest rate contracts)	10,559	9,044
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	0	0
Other assets (Interest rate contracts)	0	0
Other liabilities (Interest rate contracts)	0	0
U.S. Government Agency and Sponsored Enterprise Mortgage-Back Securities and Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	862,618	948,408
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	862,618	948,408
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	380,506	364,470
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	380,506	364,470
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	321,389	326,039
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	321,389	326,039
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	20,337	20,114
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	20,337	20,114
US Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	0	0
US Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	0	0
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	5,167	5,080
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	0	0
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	5,167	5,080
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	$0	$0

Fair_Value_Accounting_and_Meas3

Fair Value Accounting and Measurement (Financial Assets Accounted For Fair Value On Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Impaired loans	'	$4,198	'	$4,198
Fair Value, Option, Changes in Fair Value, Gain (Loss)	-862	-1,154	-1,602	-1,324
Assets, Fair Value Disclosure	3,226	6,558	3,226	6,558
Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Impaired loans	'	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
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	'	4,198	'	4,198
Assets, Fair Value Disclosure	3,226	6,558	3,226	6,558
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)	'	-656	'	-730
Covered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	1,837	395	1,837	395
Covered Loans [Member] | Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	0	0	0	0
Covered Loans [Member] | Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	0	0	0	0
Covered Loans [Member] | Fair Value, Inputs, Level 3 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	1,837	395	1,837	395
Covered Loans [Member] | 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)	-226	-29	-422	-94
Noncovered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	1,389	1,965	1,389	1,965
Noncovered Loans [Member] | Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	0	0	0	0
Noncovered Loans [Member] | Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	0	0	0	0
Noncovered Loans [Member] | Fair Value, Inputs, Level 3 [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	1,389	1,965	1,389	1,965
Noncovered Loans [Member] | 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)	($636)	($469)	($1,180)	($500)

Fair_Value_Accounting_and_Meas4

Fair Value Accounting and Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

In Thousands, unless otherwise specified

Fair Value, Inputs, Level 3 [Member]

Noncovered Loans [Member]

Noncovered Loans [Member]

Noncovered Loans [Member]

Noncovered Loans [Member]

Covered Loans [Member]

Covered Loans [Member]

Covered Loans [Member]

Covered Loans [Member]

Real Estate Collateral [Member]

Other Collateral [Member]

Other Collateral [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Market Approach Valuation Technique [Member]

Impaired Loans [Member]

Weighted Average [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value Inputs, Assets, Quantitative Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Impaired loans

$4,198

$4,198

'

'

'

'

'

'

'

'

$3,777

$421

'

OREO

'

'

$1,389

$1,965

$1,389

$1,965

$1,837

$395

$1,837

$395

'

'

'

Fair Value Inputs, Comparability Adjustments

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

[1],[2]

[1]

(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).

[2]

Other collateral consists of accounts receivable and inventory.

Fair_Value_Accounting_and_Meas5

Fair Value Accounting and Measurement (Carrying Amounts and Estimated Fair Values of Selected Financial Instruments) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Interest-earning deposits with banks	$30,646	$14,531
Securities available for sale	1,590,017	1,664,111
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	193,816	165,030
Interest-earning deposits with banks	30,646	14,531
Securities available for sale	1,590,017	1,664,111
FHLB stock	31,912	32,529
Loans held for sale	'	735
Loans	4,645,280	4,444,842
FDIC loss-sharing asset	27,981	39,846
Interest rate contracts	10,559	9,044
Liabilities	'	'
Deposits	5,985,069	5,959,475
FHLB Advances	110,587	36,606
Repurchase agreements	25,000	25,000
Interest rate contracts	10,559	9,044
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	193,816	165,030
Interest-earning deposits with banks	30,646	14,531
Securities available for sale	1,590,017	1,664,111
FHLB stock	31,912	32,529
Loans held for sale	'	735
Loans	4,790,933	4,605,038
FDIC loss-sharing asset	9,502	11,248
Interest rate contracts	10,559	9,044
Liabilities	'	'
Deposits	5,983,825	5,958,747
FHLB Advances	111,060	35,080
Repurchase agreements	26,231	26,361
Interest rate contracts	10,559	9,044
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	193,816	165,030
Interest-earning deposits with banks	30,646	14,531
Securities available for sale	20,338	20,114
FHLB stock	0	0
Loans held for sale	'	0
Loans	0	0
FDIC loss-sharing asset	0	0
Interest rate contracts	0	0
Liabilities	'	'
Deposits	5,513,961	5,449,546
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Securities available for sale	1,569,679	1,643,997
FHLB stock	31,912	32,529
Loans held for sale	'	735
Loans	0	0
FDIC loss-sharing asset	0	0
Interest rate contracts	10,559	9,044
Liabilities	'	'
Deposits	469,864	509,201
FHLB Advances	111,060	35,080
Repurchase agreements	26,231	26,361
Interest rate contracts	10,559	9,044
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	0	0
Interest-earning deposits with banks	0	0
Securities available for sale	0	0
FHLB stock	0	0
Loans held for sale	'	0
Loans	4,790,933	4,605,038
FDIC loss-sharing asset	9,502	11,248
Interest rate contracts	0	0
Liabilities	'	'
Deposits	0	0
FHLB Advances	0	0
Repurchase agreements	0	0
Interest rate contracts	$0	$0

Earnings_per_Common_Share_Deta

Earnings per Common Share (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Earnings Per Share [Abstract]	'		'		'		'
Net Income	$21,227		$14,591		$41,071		$26,767
Earnings allocated to participating securities - nonvested restricted shares	206		124		378		244
Earnings allocated to participating securities - preferred shares	41		29		79		30
Earnings allocated to common shareholders, Basic	20,980		14,438		40,614		26,493
Weighted average common shares outstanding	52,088		50,788		51,600		45,099
Basic earnings per common share	$0.40		$0.28		$0.79		$0.59
Dilutive effect of equity awards and warrants	406		1,337		863		659
Earnings allocated to common shareholders, Diluted	$20,981	[1]	$14,441	[1]	$40,617	[1]	$26,495	[1]
Weighted average diluted common shares outstanding	52,494		52,125		52,463		45,758
Diluted earnings per common share	$0.40		$0.28		$0.77		$0.58
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	63		143		73		76
[1]	Earnings allocated to common shareholders for basic and diluted EPS may differ under the two-class method as a result of adding common stock equivalents for options and warrants to dilutive shares outstanding, which alters the ratio used to allocate earnings to common shareholders and participating securities for the purposes of calculating diluted EPS.

Subsequent_Event_Details

Subsequent Event (Details) (Intermountain Community Bancorp [Domain], Subsequent Event [Member], USD $)	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jul. 23, 2014
Intermountain Community Bancorp [Domain] | Subsequent Event [Member]	'
Subsequent Event [Line Items]	'
Business Acquisition, Date of Acquisition Agreement	23-Jul-14
Business Combination, merger consideration, equity portion, share equivalent, in acquirer's shares	0
Business combinations, merger consideration, cash portion per share	$2.29
Business Combination, total merger consideration estimate	$121.50
Business Combination, total merger consideration estimate per share of acquired entity stock	$18.22