Columbia Banking System (COLB) 10-Q 6 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
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	'	53,229,819

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'		'
Cash and due from banks	$157,817		$165,030
Interest-earning deposits with banks	105,631		14,531
Total cash and cash equivalents	263,448		179,561
Securities available for sale at fair value (amortized cost of $1,609,784 and $1,680,491, respectively)	1,611,411		1,664,111
Federal Home Loan Bank stock at cost	31,592		32,529
Loans held for sale	949		735
Loans, net	4,755,151		4,444,842
FDIC loss sharing asset	23,492		39,846
Interest receivable	25,294		22,206
Premises and equipment, net	152,311		154,732
Other real estate owned ($11,589 and $12,093 covered by FDIC loss share, respectively)	21,904		35,927
Goodwill	343,952		343,952
Other intangible assets, net	21,336		25,852
Other assets	215,241		217,289
Total Assets	7,466,081		7,161,582
LIABILITIES AND SHAREHOLDERS' EQUITY	'		'
Noninterest-bearing	2,352,210		2,171,703
Interest-bearing	3,892,191		3,787,772
Total deposits	6,244,401		5,959,475
Federal Home Loan Bank advances	6,578		36,606
Securities sold under agreements to repurchase	25,000		25,000
Other liabilities	93,891		87,252
Total liabilities	6,369,870		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	52,649		51,265
Common Stock (no par value)	862,912		860,562
Retained earnings	231,577		202,514
Accumulated other comprehensive income	-495	[1]	-12,044	[1]
Total shareholders' equity	1,096,211		1,053,249
Total Liabilities and Shareholders' Equity	7,466,081		7,161,582
Noncovered Loans [Member]	'		'
ASSETS	'		'
Loans held for sale	949		735
Loans, excluding covered loans, net of unearned income of ($53,076) and ($68,282), respectively	4,579,178		4,219,451
Loans and Leases Receivable, Allowance	49,938		52,280
Loans, net	4,529,240		4,167,171
Other real estate owned ($11,589 and $12,093 covered by FDIC loss share, respectively)	10,315		23,834
Covered Loans [Member]	'		'
ASSETS	'		'
Loans and Leases Receivable, Allowance	17,933		20,174
Loans, net	225,911		277,671
Other real estate owned ($11,589 and $12,093 covered by FDIC loss share, respectively)	$11,589		$12,093
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Securities available-for-sale, amortized cost	$1,609,784	$1,680,491
Less: Unearned income on loans	-53,076	-68,282
Other real estate owned covered by FDIC loss share	21,904	35,927
Common stock, par value	$0	$0
Common stock, shares authorized	63,033	63,033
Common stock, shares outstanding	52,649	51,265
Covered Loans [Member]	'	'
Allowance for losses on covered loans	-17,933	-20,174
Other real estate owned covered by FDIC loss share	$11,589	$12,093

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Net of tax	$21,583		$13,276		$62,654		$40,043
Unrealized gain from securities:	'		'		'		'
Net unrealized holding loss from available for sale securities arising during the period	-4,057		5,943		11,830		-22,480
Reclassification adjustment of net gain from sale of available for sale securities included in income	-21		0		-352		-299
Net unrealized gain from securities, net of reclassification adjustment	-4,078		5,943		11,478		-22,779
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	23		59		71		178
Pension plan liability adjustment, net	23		59		71		-578
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	-4,055	[1]	6,002	[1]	11,549	[1]	-23,357	[1]
Total comprehensive income	$17,528		$19,278		$74,203		$16,686
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Income	'	'	'	'
Loans	$65,903	$74,125	$198,448	$196,990
Taxable securities	8,545	4,935	21,679	14,059
Tax-exempt securities	2,624	2,483	7,913	7,289
Deposits in banks	61	56	105	290
Total interest income	77,133	81,599	228,145	218,628
Interest Expense	'	'	'	'
Deposits	713	929	2,194	3,072
Federal Home Loan Bank advances	80	135	309	-493
Prepayment charge on Federal Home Loan Bank advances	0	0	0	1,548
Other borrowings	120	120	358	615
Total interest expense	913	1,184	2,861	4,742
Net Interest Income	76,220	80,415	225,284	213,886
Provision for loan and lease losses	'	'	5,019	3,581
Net interest income after provision for loan and lease losses	75,240	77,102	220,265	210,305
Noninterest Income (Loss)	'	'	'	'
Service charges and other fees	14,254	13,357	40,980	34,511
Merchant services fees	2,104	2,070	6,014	5,934
Gain (Loss) on Sale of Securities, Net	33	0	552	462
Bank owned life insurance	956	904	2,897	2,610
Change in FDIC loss sharing asset	-4,816	-11,826	-14,685	-35,446
Other	3,399	3,117	8,807	8,017
Total noninterest income (loss)	15,930	7,622	44,565	16,088
Noninterest Expense	'	'	'	'
Compensation and employee benefits	32,559	33,287	94,961	90,597
Occupancy	7,445	9,264	24,276	21,560
Merchant processing	1,080	951	3,058	2,660
Advertising and promotion	1,027	1,165	2,746	3,195
Data processing and communications	4,269	4,285	11,469	10,503
Legal and professional fees	2,905	2,421	7,377	9,975
Taxes, licenses and fees	1,156	1,446	3,387	4,037
Regulatory premiums	1,195	1,372	3,444	3,406
Net cost (benefit) of operation of other real estate owned	-1,256	-777	-1,207	-6,106
Amortization of intangibles	1,456	1,666	4,516	4,388
Other	8,146	9,634	21,105	23,052
Total noninterest expense	59,982	64,714	175,132	167,267
Income before income taxes	31,188	20,010	89,698	59,126
Income tax provision	9,605	6,734	27,044	19,083
Net Income	21,583	13,276	62,654	40,043
Earnings per common share	'	'	'	'
Basic ($ per share)	$0.41	$0.26	$1.20	$0.84
Diluted ($ per share)	$0.41	$0.25	$1.18	$0.83
Dividends paid per common share	$0.28	$0.10	$0.64	$0.30
Weighted average number of common shares outstanding	52,112	50,834	51,772	47,032
Weighted average number of diluted common shares outstanding	52,516	52,297	52,479	47,947
Noncovered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	1,500	4,260	1,600	5,260
Covered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	($520)	($947)	$3,419	($1,679)

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$2,310	($3,235)	($6,731)	$12,238
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	12	0	200	163
Net unrealized loss 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)	($33)	($40)	($98)

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, except Share data
Balance, value at Dec. 31, 2012	$764,008	$581,471	$162,388	$20,149	$0
Balance, shares at Dec. 31, 2012	'	39,686,000	'	'	0
Net Income	40,043	'	40,043	'	'
Other comprehensive income	-23,357	'	'	-23,357	'
Stock Issued During Period, Shares, New Issues	'	11,380,000	'	'	9,000
Stock Issued During Period, Value, New Issues	276,181	273,964	'	'	2,217
Stock Adjustment Value Deferred Compensation	-517	'	'	'	'
Stock Adjustment Deferred Compensation - Shares	0	'	'	'	'
Issuance of common stock - stock option and other plans, value	1,154	1,154	'	'	'
Issuance of common stock - stock option and other plans, shares	'	68,000	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,881	1,881	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, shares	'	153,000	'	'	'
Stock Repurchased During Period, Shares	'	-16,000	'	'	'
Stock Repurchased and Retired During Period, Value	-391	-391	'	'	'
Dividends, Preferred Stock, Cash	20	'	'	'	'
Cash dividends paid on common stock	14,219	'	14,219	'	'
Balance, value at Sep. 30, 2013	1,045,797	858,596	188,192	-3,208	2,217
Balance, shares at Sep. 30, 2013	'	51,271,000	'	'	9,000
Balance, value at Dec. 31, 2013	1,053,249	860,562	202,514	-12,044	2,217
Balance, shares at Dec. 31, 2013	'	51,265,000	'	'	9,000
Net Income	62,654	'	62,654	'	'
Other comprehensive income	11,549	'	'	11,549	'
Issuance of common stock - cashless exercise of warrants, shares	'	1,140,000	'	'	'
Issuance of common stock - cashless exercise of warrants, value	0	0	'	'	'
Stock Adjustment Value Deferred Compensation	-1	'	'	'	'
Stock Adjustment Deferred Compensation - Shares	0	'	'	'	'
Issuance of common stock - stock option and other plans, value	915	915	'	'	'
Issuance of common stock - stock option and other plans, shares	'	40,000	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, value	2,041	2,041	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, shares	'	228,000	'	'	'
Stock Repurchased During Period, Shares	'	-24,000	'	'	'
Stock Repurchased and Retired During Period, Value	-605	-605	'	'	'
Dividends, Preferred Stock, Cash	-66	'	'	'	'
Cash dividends paid on common stock	33,525	'	33,525	'	'
Balance, value at Sep. 30, 2014	$1,096,211	$862,912	$231,577	($495)	$2,217
Balance, shares at Sep. 30, 2014	'	52,649,000	'	'	9,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities	'	'
Net Income	$62,654	$40,043
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for loan and lease losses and losses on covered loans	5,019	3,581
Stock-based compensation expense	2,041	1,881
Depreciation, amortization and accretion	21,956	30,216
Net realized gain on sale of securities	552	462
Net realized gain on sale of other assets	566	-107
Net realized (gain) loss on sale of other real estate owned	-4,955	-8,745
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	-565	0
Write-down on other real estate owned	3,220	1,929
Net change in:	'	'
Loans held for sale	-214	1,723
Interest receivable	-3,092	-9,846
Interest payable	-61	-88
Other assets	-5,567	1,805
Other liabilities	6,749	-2,114
Net cash provided by operating activities	87,199	59,816
Cash Flows From Investing Activities	'	'
Loans originated and acquired, net of principal collected	310,185	166,905
Purchases of securities available for sale	-127,728	-292,744
Purchases of premises and equipment	-10,530	-10,087
Proceeds from FDIC reimbursement on loss-sharing asset	4,607	7,871
Proceeds from sales of securities available for sale	55,834	166,881
Proceeds from principal repayments and maturities of securities available for sale	134,882	241,388
Proceeds from Sales of Assets, Investing Activities	1,470	1,117
Proceeds from sales of covered other real estate owned	8,161	19,222
Proceeds from sales of other real estate and other personal property owned	16,527	10,779
Payment to FDIC Related to Loss-Sharing Asset	-3,384	0
Payments to Acquire Intangible Assets	0	919
Disposal Group, Not Discontinued Operation, Cash paid in disposal of assets	-16,788	0
Payments to Acquire Businesses, Net of Cash Acquired	0	-154,170
Payments for (Proceeds from) Other Investing Activities	0	522
Net cash provided by (used in) investing activities	-247,134	-178,089
Cash Flows From Financing Activities	'	'
Net increase (decrease) in deposits	307,103	23,475
Proceeds from Federal Home Loan Bank advances	1,308,000	1,144,100
Proceeds from Federal Reserve Bank borrowings	800	50
Proceeds from exercise of stock options	915	1,154
Repayment of Federal Home Loan Bank advances	-1,338,000	-1,244,000
Repayment of Federal Reserve Bank borrowings	-800	-50
Payment of common stock dividends	-33,525	-14,219
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-66	-20
Repayments of Subordinated Debt	0	51,000
Purchase and retirement of common stock	605	391
Net cash used by financing activities	243,822	-140,901
Increase (Decrease) in cash and cash equivalents	83,887	-259,174
Cash and cash equivalents at beginning of period	179,561	513,926
Cash and cash equivalents at end of period	263,448	254,752
Supplemental Information:	'	'
Cash paid for interest	2,922	4,830
Cash paid for income tax	11,230	20,221
Non-cash investing and financing activities	'	'
Loans transferred to other real estate owned	8,930	17,279
Share-based consideration issued for acquisitions	$0	$276,181

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 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 nine months ended September 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 nine month period ended September 30, 2014 include the acquisition for the entire nine month period, however the prior year period only includes the acquisition for six months of the nine 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.
	Correction of Immaterial Error Related to Prior Periods
	During the three months ended September 30, 2014, the Company made a $2.6 million adjustment which increased interest income on taxable securities as a result of identifying that the premium amortization related to the Company’s mortgage-backed securities, as calculated by a third-party provider, was not being amortized utilizing an acceptable method under accounting principles generally accepted in the United States. The adjustment reflects the one-time correction necessary to change the accounting for premium amortization to be in conformity with the interest method. Based upon an evaluation of all relevant factors, management believes the correcting adjustment did not have a material impact on the Company’s current quarter, current year-to-date, or previously reported results.

Accounting_Pronouncements_Rece

Accounting Pronouncements Recently Issued	9 Months Ended
	Sep. 30, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Accounting Pronouncements Recently Issued	'
	Accounting Pronouncements Recently Issued
	In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The Update provides U.S. GAAP guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and about related footnote disclosures. For each reporting period, management will be required to evaluate whether there are conditions or events that raise substantial doubt about a company’s ability to continue as a going concern within one year from the date the financial statements are issued. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. 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 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 Update provides 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 September 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 Update changes 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. The Update 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 has assessed the impact of the new guidance and determined that adopting the proportional amortization method will not have a material impact on its consolidated financial statements.

Business_combinations

Business combinations	9 Months Ended
	Sep. 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 September 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.
	For illustrative purposes only, the following table presents certain unaudited pro forma information for the nine month period ended September 30, 2013. 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 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
		Nine Months Ended September 30,
		2013
		(in thousands)
	Total revenues (net interest income plus noninterest income)	$	252,392
	Net income	$	53,053
	Earnings per share - basic	$	1.04
	Earnings per share - diluted	$	1.01
	In connection with the West Coast acquisition, Columbia recognized $2.8 million and $7.6 million of acquisition-related expenses for the three month periods ended September 30, 2014 and 2013, respectively, and $4.4 million and $17.6 million for the nine month periods ended September 30, 2014 and 2013, respectively. In addition, related to the recently announced acquisition of Intermountain Community Bancorp, Columbia recognized $459 thousand of acquisition-related expenses for the three month period ended September 30, 2014.
	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	9 Months Ended
	Sep. 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)
	September 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	867,583	$	7,950		$	(13,067	)	$	862,466
	State and municipal securities	376,862		14,101			(1,466		)	389,497
	U.S. government agency and government-sponsored enterprise securities	339,152		467			(5,620		)	333,999
	U.S. government securities	20,903		1			(600		)	20,304
	Other securities	5,284		22			(161		)	5,145
	Total	$	1,609,784	$	22,541		$	(20,914	)	$	1,611,411
	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
	Proceeds from sales of securities available-for-sale were $25.1 million and $55.8 million for the three and nine months ended September 30, 2014, respectively. There were no proceeds from the sales of securities available for sale for the three months ended September 30, 2013. Proceeds from the sales of securities available for sale for the nine months ended September 30, 2013 were $166.9 million. The following table provides the gross realized gains and losses on the sales of securities for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014			2013
		(in thousands)
	Gross realized gains	$	33	$	—		$	552		$	632
	Gross realized losses	—		—			—			(170		)
	Net realized gains	$	33	$	—		$	552		$	462
	The scheduled contractual maturities of investment securities available for sale at September 30, 2014 are presented as follows:
		September 30, 2014
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	12,863	$	12,945
	Due after one year through five years	357,261		356,376
	Due after five years through ten years	443,780		443,165
	Due after ten years	790,596		793,779
	Other securities with no stated maturity	5,284		5,146
	Total investment securities available-for-sale	$	1,609,784	$	1,611,411
	The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		September 30, 2014
		(in thousands)
	Washington and Oregon State to secure public deposits	$	286,337
	Federal Reserve Bank to secure borrowings	41,352
	Other securities pledged	44,488
	Total securities pledged as collateral	$	372,177
	The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 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)
	September 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	162,583	$	(1,219	)	$	283,292		$	(11,848	)	$	445,875	$	(13,067	)
	State and municipal securities	29,307		(170		)	52,322			(1,296		)	81,629		(1,466		)
	U.S. government agency and government-sponsored enterprise securities	50,689		(201		)	231,082			(5,419		)	281,771		(5,620		)
	U.S. government securities	—		—			19,253			(600		)	19,253		(600		)
	Other securities	—		—			5,109			(161		)	5,109		(161		)
	Total	$	242,579	$	(1,590	)	$	591,058		$	(19,324	)	$	833,637	$	(20,914	)
	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 September 30, 2014, there were 66 U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations securities in an unrealized loss position, of which 43 were in a continuous loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates relative to where these investments fall within the yield curve and their individual characteristics. Because the Company does not intend to sell these securities nor does the Company consider it more likely than not that it will be required to sell these securities before the recovery of amortized cost basis, which may be upon maturity, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2014.
At September 30, 2014, there were 74 state and municipal government securities in an unrealized loss position, of which 56 were in a continuous loss position for 12 months or more. The unrealized losses on state and municipal securities were caused by interest rate changes or widening of market spreads subsequent to the purchase of the individual securities. Management monitors published credit ratings of these securities for adverse changes. As of September 30, 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 September 30, 2014.
At September 30, 2014, there were 29 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, 20 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 September 30, 2014.
At September 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 September 30, 2014.
At September 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 September 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	9 Months Ended
	Sep. 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):
		September 30,				December 31,
		2014				2013
	Noncovered loans:	(in thousands)
	Commercial business	$	1,829,393			$	1,561,782
	Real estate:
	One-to-four family residential	108,743				108,317
	Commercial and multifamily residential	2,144,044				2,080,075
	Total real estate	2,252,787				2,188,392
	Real estate construction:
	One-to-four family residential	73,882				54,155
	Commercial and multifamily residential	137,366				126,390
	Total real estate construction	211,248				180,545
	Consumer	338,826				357,014
	Less: Net unearned income	(53,076		)		(68,282		)
	Total noncovered loans, net of unearned income	4,579,178				4,219,451
	Less: Allowance for loan and lease losses	(49,938		)		(52,280		)
	Total noncovered loans, net	$	4,529,240			$	4,167,171
	Loans held for sale	$	949			$	735
	At September 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 $12.1 million at September 30, 2014 and $14.2 million at December 31, 2013. During the first nine months of 2014, advances on related party loans totaled $1.7 million and repayments totaled $3.8 million.
	At September 30, 2014 and December 31, 2013, $1.04 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 $38.3 million and $45.2 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at September 30, 2014 and December 31, 2013, respectively.
	The following is an analysis of noncovered, nonaccrual loans as of September 30, 2014 and December 31, 2013:
		September 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	$	11,199			$	16,666			$	12,433		$	19,186
	Unsecured	291				301				176			202
	Real estate:
	One-to-four family residential	3,513				5,825				2,667			4,678
	Commercial & multifamily residential:
	Commercial land	488				788				442			783
	Income property	3,998				6,486				4,267			5,383
	Owner occupied	3,982				6,144				6,334			7,486
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	573				1,754				3,246			6,601
	Residential construction	458				1,928				459			1,928
	Consumer	3,496				4,980				3,991			6,187
	Total	$	27,998			$	44,872			$	34,015		$	52,434
	The following is an aging of the recorded investment of the noncovered loan portfolio as of September 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
	September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,740,253			$	6,484			$	394		$	—			$	6,878			$	11,199	$	1,758,330
	Unsecured	66,057				334				20			—				354				291		66,702
	Real estate:
	One-to-four family residential	103,040				259				—			—				259				3,513		106,812
	Commercial & multifamily residential:
	Commercial land	138,874				—				435			—				435				488		139,797
	Income property	1,201,919				8,517				90			—				8,607				3,998		1,214,524
	Owner occupied	760,234				519				739			—				1,258				3,982		765,474
	Real estate construction:
One-to-four family residential:
Land and acquisition	12,431				—				—			—				—				573		13,004
Residential construction	59,841				—				—			—				—				458		60,299
Commercial & multifamily residential:
Income property	85,090				—				—			—				—				—		85,090
Owner occupied	51,420				—				—			—				—				—		51,420
Consumer	313,536				601				93			—				694				3,496		317,726
Total	$	4,532,695			$	16,714			$	1,771		$	—			$	18,485			$	27,998	$	4,579,178
	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 September 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
September 30, 2014	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	1,751,081			$	7,249			$	1,134		$	1,727			$	39			$	6,115	$	7,055
Unsecured	66,691				11				11			11				11				—		—
Real estate:
One-to-four family residential	104,244				2,568				428			469				124				2,140		3,585
Commercial & multifamily residential:
Commercial land	139,709				88				—			—				—				88		398
Income property	1,207,801				6,723				—			—				—				6,723		11,236
Owner occupied	756,410				9,064				586			585				31				8,478		12,999
Real estate construction:
One-to-four family residential:
Land and acquisition	12,894				110				110			110				68				—		—
Residential construction	60,299				—				—			—				—				—		—
Commercial & multifamily residential:
Income property	85,090				—				—			—				—				—		—
Owner occupied	51,420				—				—			—				—				—		—
Consumer	317,593				133				—			—				—				133		208
Total	$	4,553,232			$	25,946			$	2,269		$	2,902			$	273			$	23,677	$	35,481
	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 nine month periods indicated.
	Three Months Ended September 30,															Nine Months Ended September 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	$	6,869			$	17			$	6,631		$	(25	)		$	6,550			$	50	$	5,774	$	12
Unsecured	15				—				47			1				23				1		68		2
Real estate:
One-to-four family residential	2,307				14				1,537			16				2,082				37		1,677		47
Commercial & multifamily residential:
Commercial land	94				—				1,456			48				102				—		2,085		48
Income property	7,345				69				10,358			22				6,891				205		9,534		168
Owner occupied	9,117				239				9,822			231				9,629				715		10,721		740
Real estate construction:
One-to-four family residential:
Land and acquisition	111				1				2,889			1				840				4		2,794		4
Residential construction	—				—				—			—				—				—		526		—
Consumer	142				2				423			2				152				7		275		5
Total	$	26,000			$	342			$	33,163		$	296			$	26,269			$	1,019	$	33,454	$	1,026
The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and nine months ended September 30, 2014 and 2013:
	Three months ended September 30, 2014										Three months ended September 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)
Real estate:
Commercial and multifamily residential:
Owner occupied	1			$	1,496			$	1,496		—			$	—			$	—
Total	1			$	1,496			$	1,496		—			$	—			$	—
	Nine months ended September 30, 2014										Nine months ended September 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			1,496				1,496			1			172				172
Real estate construction:
One-to-four family residential:
Land and acquisition	—			—				—			1			117				117
Total	8			$	2,892			$	2,875		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 nine month periods ending September 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 $92 thousand of additional funds on loans classified as TDR as of September 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 nine month periods ended September 30, 2014 and 2013.

Allowance_for_Noncovered_Loan_

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit	9 Months Ended
	Sep. 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 nine months ended September 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 nine months ended September 30, 2014 and 2013:
			Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
			Balance										Balance		Reserve		Allocation
	Three months ended September 30, 2014		(in thousands)
	Noncovered loans:
	Commercial business:
	Secured		$	25,519	$	(1,348	)	$	333	$	243		$	24,747	$	39	$	24,708
	Unsecured		754		—			23		112			889		11		878
	Real estate:
	One-to-four family residential		1,083		—			63		230			1,376		124		1,252
	Commercial & multifamily residential:
	Commercial land		470		—			51		(124		)	397		—		397
	Income property		10,511		—			83		(784		)	9,810		—		9,810
	Owner occupied		4,990		(7		)	5		(193		)	4,795		31		4,764
	Real estate construction:
	One-to-four family residential:
	Land and acquisition		403		—			3		876			1,282		68		1,214
	Residential construction		677		—			18		1,103			1,798		—		1,798
	Commercial & multifamily residential:
	Income property		414		—			—		535			949		—		949
	Owner occupied		166		—			—		168			334		—		334
	Consumer		2,643		(620		)	340		502			2,865		—		2,865
	Unallocated		1,864		—			—		(1,168		)	696		—		696
	Total		$	49,494	$	(1,975	)	$	919	$	1,500		$	49,938	$	273	$	49,665
			Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
			Balance										Balance		Reserve		Allocation
	Nine months ended September 30, 2014		(in thousands)
	Noncovered loans:
	Commercial business:
	Secured		$	31,027	$	(3,188	)	$	2,216	$	(5,308	)	$	24,747	$	39	$	24,708
	Unsecured		696		(110		)	342		(39		)	889		11		878
	Real estate:
	One-to-four family residential		1,252		(207		)	103		228			1,376		124		1,252
	Commercial & multifamily residential:
	Commercial land		489		(29		)	70		(133		)	397		—		397
	Income property		9,234		(1,934		)	601		1,909			9,810		—		9,810
	Owner occupied		3,605		(1,030		)	44		2,176			4,795		31		4,764
	Real estate construction:
	One-to-four family residential:
	Land and acquisition		610		—			44		628			1,282		68		1,214
	Residential construction		822		—			461		515			1,798		—		1,798
	Commercial & multifamily residential:
	Income property		285		—			—		664			949		—		949
	Owner occupied		58		—			—		276			334		—		334
	Consumer		2,547		(2,256		)	931		1,643			2,865		—		2,865
	Unallocated		1,655		—			—		(959		)	696		—		696
	Total		$	52,280	$	(8,754	)	$	4,812	$	1,600		$	49,938	$	273	$	49,665
			Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
			Balance										Balance		Reserve		Allocation
	Three months ended September 30, 2013		(in thousands)
	Noncovered loans:
	Commercial business:
Secured		$	30,572	$	(392	)	$	743	$	3,187		$	34,110	$	241	$	33,869
Unsecured		821		(363		)	111		491			1,060		43		1,017
Real estate:
One-to-four family residential		672		(47		)	39		677			1,341		103		1,238
Commercial & multifamily residential:
Commercial land		691		(9		)	126		(260		)	548		—		548
Income property		9,695		(132		)	154		85			9,802		—		9,802
Owner occupied		4,515		(516		)	52		637			4,688		26		4,662
Real estate construction:
One-to-four family residential:
Land and acquisition		769		—			366		(410		)	725		73		652
Residential construction		204		—			95		426			725		—		725
Commercial & multifamily residential:
Income property		241		—			—		17			258		—		258
Owner occupied		80		—			—		(12		)	68		—		68
Consumer		2,455		(453		)	112		405			2,519		—		2,519
Unallocated		983		—			—		(983		)	—		—		—
Total		$	51,698	$	(1,912	)	$	1,798	$	4,260		$	55,844	$	486	$	55,358
		Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
		Balance										Balance		Reserve		Allocation
Nine months ended September 30, 2013		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	27,270	$	(2,236	)	$	1,135	$	7,941		$	34,110	$	241	$	33,869
Unsecured		753		(794		)	184		917			1,060		43		1,017
Real estate:
One-to-four family residential		694		(191		)	180		658			1,341		103		1,238
Commercial & multifamily residential:
Commercial land		460		(20		)	153		(45		)	548		—		548
Income property		11,033		(950		)	260		(541		)	9,802		—		9,802
Owner occupied		6,362		(1,084		)	96		(686		)	4,688		26		4,662
Real estate construction:
One-to-four family residential:
Land and acquisition		1,171		(32		)	2,541		(2,955		)	725		73		652
Residential construction		635		(101		)	108		83			725		—		725
Commercial & multifamily residential:
Income property		316		—			—		(58		)	258		—		258
Owner occupied		102		—			—		(34		)	68		—		68
Consumer		2,437		(1,262		)	353		991			2,519		—		2,519
Unallocated		1,011		—			—		(1,011		)	—		—		—
Total		$	52,244	$	(6,670	)	$	5,010	$	5,260		$	55,844	$	486	$	55,358
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					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014		2013
		(in thousands)
Balance at beginning of period		$	2,355	$	2,465		$	2,505	$	1,915
Net changes in the allowance for unfunded commitments and letters of credit		150		200			—		750
Balance at end of period		$	2,505	$	2,665		$	2,505	$	2,665
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 September 30, 2014 and December 31, 2013:
		Pass		Special Mention			Substandard		Doubtful			Loss		Total
September 30, 2014		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	1,678,642	$	43,841		$	35,847	$	—		$	—	$	1,758,330
Unsecured		66,261		198			243		—			—		66,702
Real estate:
One-to-four family residential		102,126		55			4,631		—			—		106,812
Commercial and multifamily residential:
Commercial land		137,651		—			2,146		—			—		139,797
Income property		1,197,040		4,468			13,016		—			—		1,214,524
Owner occupied		754,446		3,153			7,875		—			—		765,474
Real estate construction:
One-to-four family residential:
Land and acquisition		11,307		—			1,697		—			—		13,004
Residential construction		57,205		—			3,094		—			—		60,299
Commercial and multifamily residential:
Income property		85,090		—			—		—			—		85,090
Owner occupied		50,521		899			—		—			—		51,420
Consumer		313,423		—			4,303		—			—		317,726
Total		$	4,453,712	$	52,614		$	72,852	$	—		$	—	4,579,178
Less:
Allowance for loan and lease losses														49,938
Noncovered loans, net														$	4,529,240
		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	9 Months Ended
	Sep. 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 nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	15,203		$	24,339		$	23,834		$	10,676
	Established through acquisitions	—			—			—			14,708
	Transfers in, net of write-downs ($0, $48, $0 and $90, respectively)	475			4,413			2,809			9,190
	Additional OREO write-downs	(630		)	(1,066		)	(2,195		)	(1,636		)
	Proceeds from sale of OREO property	(6,229		)	(4,673		)	(16,527		)	(10,295		)
	Gain on sale of OREO, net	1,496			530			2,394			900
	Total noncovered OREO at end of period	$	10,315		$	23,543		$	10,315		$	23,543

Covered_Assets_and_FDIC_Losssh

Covered Assets and FDIC Loss-sharing Asset	9 Months Ended
	Sep. 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 September 30, 2014, the net present value of the Bank’s estimated clawback liability is $4.2 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 September 30, 2014 and December 31, 2013:
		September 30, 2014			December 31, 2013
	Covered loans:	(in thousands)
	Commercial business	$	52,891		$	72,870
	Real estate:
	One-to-four family residential	34,934			41,642
	Commercial and multifamily residential	147,488			170,879
	Total real estate	182,422			212,521
	Real estate construction:
	One-to-four family residential	5,798			14,781
	Commercial and multifamily residential	2,619			6,869
	Total real estate construction	8,417			21,650
	Consumer	29,291			34,101
	Subtotal of covered loans	273,021			341,142
	Less:
	Valuation discount resulting from acquisition accounting	29,177			43,297
	Allowance for loan losses	17,933			20,174
	Covered loans, net of allowance for loan losses	$	225,911		$	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 impaired 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 carrying 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 impaired loans for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	92,511		$	140,511		$	103,907		$	166,888
	Accretion	(8,034		)	(12,243		)	(28,658		)	(40,240		)
	Disposals	(357		)	(5,772		)	(3,183		)	(621		)
	Reclassifications (to) from nonaccretable difference	(3,589		)	(3,013		)	8,465			(6,544		)
	Balance at end of period	$	80,531		$	119,483		$	80,531		$	119,483
	During the three months ended September 30, 2014, the Company recorded a provision recapture for losses on covered loans of $520 thousand. Of this amount, $320 thousand was impairment recapture calculated in accordance with ASC 310-30 and $200 thousand was provision recapture to adjust the allowance for loss calculated under ASC 450-20 for draws on acquired loans. The impact to earnings of the $520 thousand provision recapture for covered loans was partially offset through noninterest income by a $416 thousand unfavorable adjustment to the change FDIC loss-sharing asset line item.
	The changes in the ALLL for covered loans for the three and nine months ended September 30, 2014 and 2013 are summarized as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	19,801		$	26,135		$	20,174		$	30,056
	Loans charged off	(3,236		)	(5,006		)	(11,350		)	(10,031		)
	Recoveries	1,888			2,555			5,690			4,391
	Provision (recapture) for loan losses	(520		)	(947		)	3,419			(1,679		)
	Balance at end of period	$	17,933		$	22,737		$	17,933		$	22,737
	The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	September 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	38,130		$	913		$	11,441		$	—		$	—	$	50,484
	Unsecured	2,316			—			91			—			—		2,407
	Real estate:
	One-to-four family residential	30,711			—			4,223			—			—		34,934
	Commercial and multifamily residential:
	Commercial land	9,913			—			6,246			—			—		16,159
	Income property	54,117			3,220			7,507			—			—		64,844
	Owner occupied	59,746			354			6,385			—			—		66,485
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	2,713			—			1,096			—			—		3,809
Residential construction	750			—			1,239			—			—		1,989
Commercial and multifamily residential:
Income property	1,458			—			227			—			—		1,685
Owner occupied	934			—			—			—			—		934
Consumer	26,320			—			2,971			—			—		29,291
Total	$	227,108		$	4,487		$	41,426		$	—		$	—	273,021
Less:
Valuation discount resulting from acquisition accounting															29,177
Allowance for loan losses															17,933
Covered loans, net															$	225,911
	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 nine months ended September 30, 2014 and 2013:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Covered OREO:
Balance at beginning of period	$	13,051		$	12,854		$	12,093		$	16,311
Transfers in	614			3,559			6,121			8,089
Write-downs	(37		)	(199		)	(1,025		)	(293		)
Proceeds from sale of OREO property	(2,526		)	(5,408		)	(8,161		)	(19,222		)
Net gain on sale of OREO	487			1,924			2,561			7,845
Total covered OREO at end of period	$	11,589		$	12,730		$	11,589		$	12,730
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 September 30, 2014, the FDIC loss-sharing asset is comprised of a $19.8 million FDIC indemnification asset and a $3.7 million FDIC receivable. The indemnification asset represents the cash flows the Company expects to collect from the FDIC under the loss-sharing agreements and the FDIC receivable represents amounts from the FDIC for which the Company has requested reimbursement but has not yet received reimbursement.
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 nine months ended September 30, 2014 and 2013:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(in thousands)
Balance at beginning of period	$	27,981		$	67,374		$	39,846		$	96,354
Adjustments not reflected in income:
Cash payments to (from) the FDIC	541			(1,484		)	(1,223		)	(7,871		)
FDIC reimbursable losses (recoveries), net	(214		)	(505		)	(446		)	522
Adjustments reflected in income:
Amortization, net	(3,992		)	(9,890		)	(16,208		)	(29,470		)
Loan impairment (recapture)	(416		)	(758		)	2,735			(1,343		)
Sale of other real estate	(383		)	(1,479		)	(2,104		)	(5,076		)
Write-downs of other real estate	67			220			860			373
Other	(92		)	81			32			70
Balance at end of period	$	23,492		$	53,559		$	23,492		$	53,559

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Goodwill
	Goodwill at beginning of period (1)	$	343,952		$	343,952		$	343,952		$	115,554
	Established through acquisitions (1)	—			—			—			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			47,698			47,698			32,441
	Accumulated amortization at beginning of period	(25,825		)	(19,441		)	(22,765		)	(16,720		)
	Core deposit intangible, net at beginning of period	21,873			28,257			24,933			15,721
	Established through acquisitions	—			—			—			15,257
	CDI current period amortization	(1,456		)	(1,667		)	(4,516		)	(4,388		)
	Total core deposit intangible, net at end of period	20,417			26,590			20,417			26,590
	Intangible assets not subject to amortization	919			919			919			919
	Other intangible assets, net at end of period	21,336			27,509			21,336			27,509
	Total goodwill and other intangible assets at end of period	$	365,288		$	371,461		$	365,288		$	371,461
	__________
	(1) Goodwill at beginning of period for the three months ended September 30, 2013 and goodwill established through acquisitions for the nine months ended September 30, 2013 have been retrospectively adjusted 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 three months ending December 31, 2014 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2014	$	1,447
	2015	4,934
	2016	4,195
	2017	3,361
	2018	2,500

Derivatives_and_Balance_Sheet_

Derivatives and Balance Sheet Offsetting	9 Months Ended
	Sep. 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 September 30, 2014 and December 31, 2013 was $199.7 million and $179.5 million, respectively. There was no impact to the statement of income for the three and nine month periods ending September 30, 2014 and 2013.
	The following table presents the fair value of derivatives not designated as hedging instruments at September 30, 2014 and December 31, 2013:
		Asset Derivatives									Liability Derivatives
		September 30, 2014						December 31, 2013			September 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		$	9,472			Other assets	$	9,044	Other liabilities		$	9,472			Other liabilities	$	9,044
	The Company is party to interest rate contracts and repurchase agreements that are subject to enforceable master netting arrangements or similar agreements. Under these agreements, the Company may have the right to net settle multiple contracts with the same counterparty. The following tables show the gross interest rate swap agreements and repurchase agreements in the consolidated balance sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown.
		Gross Amounts of Recognized Assets/Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets			Net Amounts of Assets/Liabilities Presented in the Consolidated Balance Sheets		Gross Amounts Not Offset in the Consolidated Balance Sheets
											Collateral Posted				Net Amount
	September 30, 2014	(in thousands)
	Assets
	Interest rate contracts	$	9,472			$	—		$	9,472	$	—			$	9,472
	Liabilities
	Interest rate contracts	$	9,472			$	—		$	9,472	$	(9,472	)		$	—
	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	)		$	—

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 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 September 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 nine month period ended September 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. 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. Subsequent to quarter end, on October 23, 2014 the Company declared a quarterly cash divided of $0.16 per common share and common share equivalent for holders of preferred stock, and a special, one-time cash divided of $0.14 per common share and common share equivalent for holders of preferred stock, both payable on November 19, 2014 to shareholders of record at the close of business October 31, 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	9 Months Ended
	Sep. 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 nine month periods ended September 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 September 30, 2014	(in thousands)
	Beginning balance	$	5,448		$	(1,888	)	$	3,560
	Other comprehensive loss before reclassifications	(4,057		)	—			(4,057		)
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(21		)	23			2
	Net current-period other comprehensive income (loss)	(4,078		)	23			(4,055		)
	Ending balance	$	1,370		$	(1,865	)	$	(495	)
	Three months ended September 30, 2013
	Beginning balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Other comprehensive income before reclassifications	5,943			—			5,943
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	—			59			59
	Net current-period other comprehensive income	5,943			59			6,002
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	Nine months ended September 30, 2014
	Beginning balance	$	(10,108	)	$	(1,936	)	$	(12,044	)
	Other comprehensive income before reclassifications	11,830			—			11,830
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(352		)	71			(281		)
	Net current-period other comprehensive income	11,478			71			11,549
	Ending balance	$	1,370		$	(1,865	)	$	(495	)
	Nine months ended September 30, 2013
	Beginning balance	$	20,918		$	(769	)	$	20,149
	Other comprehensive loss before reclassifications	(22,480		)	(756		)	(23,236		)
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(299		)	178			(121		)
	Net current-period other comprehensive loss	(22,779		)	(578		)	(23,357		)
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	__________
	(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 September 30, 2014 and 2013:
		Amount Reclassified from Accumulated Other Comprehensive Loss
		Three Months Ended September 30,						Nine Months Ended September 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	$	33		$	—		$	552		$	462		Investment securities gains, net
		33			—			552			462			Total before tax
		(12		)	—			(200		)	(163		)	Income tax provision
		$	21		$	—		$	352		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(36	)	$	(92	)	$	(111	)	$	(276	)	Compensation and employee benefits
		(36		)	(92		)	(111		)	(276		)	Total before tax
		13			33			40			98			Income tax benefit
		$	(23	)	$	(59	)	$	(71	)	$	(178	)	Net of tax

Fair_Value_Accounting_and_Meas

Fair Value Accounting and Measurement	9 Months Ended
	Sep. 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 September 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
	September 30, 2014	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	862,466	$	—		$	862,466	$	—
	State and municipal debt securities	389,497		—			389,497		—
	U.S. government agency and government-sponsored enterprise securities	333,999		—			333,999		—
	U.S. government securities	20,304		20,304			—		—
	Other securities	5,145		—			5,145		—
	Total securities available for sale	$	1,611,411	$	20,304		$	1,591,107	$	—
	Other assets (Interest rate contracts)	$	9,472	$	—		$	9,472	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	9,472	$	—		$	9,472	$	—
		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 nine month periods ended September 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 information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:
		Fair value at September 30, 2014		Fair Value Measurements at Reporting Date Using							Gains (Losses) During the Three Months Ended			Losses During the Nine Months Ended
				Level 1			Level 2		Level 3		30-Sep-14			30-Sep-14
		(in thousands)
	Impaired loans	$	2,998	$	—		$	—	$	2,998	$	69		$	(14	)
	Noncovered OREO	2,535		—			—		2,535		(351		)	(351		)
	Covered OREO	415		—			—		415		(37		)	(37		)
		$	5,948	$	—		$	—	$	5,948	$	(319	)	$	(402	)
		Fair value at		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended			Losses During the Nine Months Ended September 30, 2013
		September 30, 2013		Level 1			Level 2		Level 3		30-Sep-13
		(in thousands)
	Noncovered OREO	$	3,714	$	—		$	—	$	3,714	$	(1,040	)	$	(1,084	)
	Covered OREO	544		—			—		544		(183		)	(248		)
		$	4,258	$	—		$	—	$	4,258	$	(1,223	)	$	(1,332	)
	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 September 30, 2014		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(dollars in thousands)
	Impaired loans - real estate collateral	$	534	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Impaired loans - other collateral (3)	2,464		Fair Market Value of Collateral		Adjustment to Stated value	0% - 71% (49%)
Noncovered OREO	2,535		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Covered OREO	415		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, inventory and equipment.
	Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
	September 30, 2013
	(dollars in thousands)
Noncovered OREO	$	3,714	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Covered OREO	544		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 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 September 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 September 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 September 30, 2014 and December 31, 2013:
	September 30, 2014
	Carrying		Fair			Level 1		Level 2		Level 3
	Amount		Value
	(in thousands)
Assets
Cash and due from banks	$	157,817	$	157,817		$	157,817	$	—	$	—
Interest-earning deposits with banks	105,631		105,631			105,631		—		—
Securities available for sale	1,611,411		1,611,411			20,304		1,591,107		—
FHLB stock	31,592		31,592			—		31,592		—
Loans held for sale	949		949			—		949		—
Loans	4,755,151		4,862,053			—		—		4,862,053
FDIC loss-sharing asset	23,492		9,385			—		—		9,385
Interest rate contracts	9,472		9,472			—		9,472		—
Liabilities
Deposits	$	6,244,401	$	6,242,655		$	5,794,399	$	448,256	$	—
FHLB Advances	6,578		7,105			—		7,105		—
Repurchase agreements	25,000		26,167			—		26,167		—
Interest rate contracts	9,472		9,472			—		9,472		—
	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	9 Months Ended
	Sep. 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 nine months ended September 30, 2014 and 2013:
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
			(in thousands except per share)
	Basic EPS:
	Net income		$	21,583	$	13,276	$	62,654	$	40,043
	Less: Earnings allocated to participating securities
	Preferred shares		42		27		121		58
	Nonvested restricted shares		216		109		598		355
	Earnings allocated to common shareholders		$	21,325	$	13,140	$	61,935	$	39,630
	Weighted average common shares outstanding		52,112		50,834		51,772		47,032
	Basic earnings per common share		$	0.41	$	0.26	$	1.2	$	0.84
	Diluted EPS:
	Earnings allocated to common shareholders (1)		$	21,325	$	13,142	$	61,940	$	39,635
	Weighted average common shares outstanding		52,112		50,834		51,772		47,032
	Dilutive effect of equity awards		404		1,463		707		915
	Weighted average diluted common shares outstanding		52,516		52,297		52,479		47,947
	Diluted earnings per common share		$	0.41	$	0.25	$	1.18	$	0.83
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive		58		138		67		99
	__________
	-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.

Branch_Sales

Branch Sales	9 Months Ended
	Sep. 30, 2014
Branch Sales [Abstract]	'
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	'
	Branch Sales
	On August 23, 2014, Columbia completed a branch sale transaction to Sound Community Bancorp. In the transaction, Columbia sold three branches and related assets and deposit liabilities to Sound Community Bancorp. The transaction was completed with a transfer of $22.2 million in deposits to Sound Community Bancorp in exchange for a deposit premium of 2.35%. Also included in the branch sale were $1.1 million in loans and $3.8 million in premises and equipment. The Company recognized a gain of $565 thousand related to the deposit premium, which was recorded in the line item Other noninterest income in the Consolidated Statements of Income. In addition, the Company recorded a $50 thousand loss on the disposal of premises and equipment related to this transaction, which was recorded in the line item Other noninterest expense in the Consolidated Statements of Income.

Subsequent_Event

Subsequent Event	9 Months Ended
	Sep. 30, 2014
Subsequent Event [Line Items]	'
Subsequent Events [Text Block]	'
	Subsequent Event
	Subsequent events are events or transactions that occur after the balance sheet date but before financial statements are issued. Recognized subsequent events are events or transactions that provide additional evidence about conditions that existed at the date of the balance sheet, including the estimates inherent in the process of preparing financial statements. Nonrecognized subsequent events are events that provide evidence about conditions that did not exist at the date of the balance sheet but arose after that date.
	On November 1, 2014, the Company completed its acquisition of Intermountain Community Bancorp ("Intermountain"), with total merger consideration of approximately $134.1 million. The Company acquired 100% of the voting equity interests of Intermountain. The primary reason for the acquisition was to expand the Company's geographic footprint into the state of Idaho, consistent with its ongoing growth strategy. The operating results of the Company for the nine months ended September 30, 2014 do not include the operating results produced by Intermountain as the acquisition did not close until November 1, 2014. It is not practical to present other financial information related to the acquisition at this time because the fair value measurement of assets acquired and liabilities assumed has not been finalized.

Business_combinations_Tables

Business combinations (Tables)	9 Months Ended
	Sep. 30, 2014
Business Acquisition, Supplemental Pro Forma Information [Line Items]	'
Business Acquisition, Pro Forma Information [Table Text Block]	'
	For illustrative purposes only, the following table presents certain unaudited pro forma information for the nine month period ended September 30, 2013. 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 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
		Nine Months Ended September 30,
		2013
		(in thousands)
	Total revenues (net interest income plus noninterest income)	$	252,392
	Net income	$	53,053
	Earnings per share - basic	$	1.04
	Earnings per share - diluted	$	1.01

Securities_Tables

Securities (Tables)	9 Months Ended
	Sep. 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)
	September 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	867,583	$	7,950		$	(13,067	)	$	862,466
	State and municipal securities	376,862		14,101			(1,466		)	389,497
	U.S. government agency and government-sponsored enterprise securities	339,152		467			(5,620		)	333,999
	U.S. government securities	20,903		1			(600		)	20,304
	Other securities	5,284		22			(161		)	5,145
	Total	$	1,609,784	$	22,541		$	(20,914	)	$	1,611,411
	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 gross realized gains and losses on sales and calls of securities available for sale	'
	The following table provides the gross realized gains and losses on the sales of securities for the periods indicated:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014			2013
		(in thousands)
	Gross realized gains	$	33	$	—		$	552		$	632
	Gross realized losses	—		—			—			(170		)
	Net realized gains	$	33	$	—		$	552		$	462
Schedule of Contractual Maturities of Investment Securities Available for Sale	'
	The scheduled contractual maturities of investment securities available for sale at September 30, 2014 are presented as follows:
		September 30, 2014
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	12,863	$	12,945
	Due after one year through five years	357,261		356,376
	Due after five years through ten years	443,780		443,165
	Due after ten years	790,596		793,779
	Other securities with no stated maturity	5,284		5,146
	Total investment securities available-for-sale	$	1,609,784	$	1,611,411
Carrying Value of Securities Pledged As Collateral	'
	The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		September 30, 2014
		(in thousands)
	Washington and Oregon State to secure public deposits	$	286,337
	Federal Reserve Bank to secure borrowings	41,352
	Other securities pledged	44,488
	Total securities pledged as collateral	$	372,177
Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses	'
	The following table shows the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 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)
	September 30, 2014
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	162,583	$	(1,219	)	$	283,292		$	(11,848	)	$	445,875	$	(13,067	)
	State and municipal securities	29,307		(170		)	52,322			(1,296		)	81,629		(1,466		)
	U.S. government agency and government-sponsored enterprise securities	50,689		(201		)	231,082			(5,419		)	281,771		(5,620		)
	U.S. government securities	—		—			19,253			(600		)	19,253		(600		)
	Other securities	—		—			5,109			(161		)	5,109		(161		)
	Total	$	242,579	$	(1,590	)	$	591,058		$	(19,324	)	$	833,637	$	(20,914	)
	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])	9 Months Ended
	Sep. 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):
		September 30,				December 31,
		2014				2013
	Noncovered loans:	(in thousands)
	Commercial business	$	1,829,393			$	1,561,782
	Real estate:
	One-to-four family residential	108,743				108,317
	Commercial and multifamily residential	2,144,044				2,080,075
	Total real estate	2,252,787				2,188,392
	Real estate construction:
	One-to-four family residential	73,882				54,155
	Commercial and multifamily residential	137,366				126,390
	Total real estate construction	211,248				180,545
	Consumer	338,826				357,014
	Less: Net unearned income	(53,076		)		(68,282		)
	Total noncovered loans, net of unearned income	4,579,178				4,219,451
	Less: Allowance for loan and lease losses	(49,938		)		(52,280		)
	Total noncovered loans, net	$	4,529,240			$	4,167,171
	Loans held for sale	$	949			$	735
Analysis of nonaccrual loans	'
	The following is an analysis of noncovered, nonaccrual loans as of September 30, 2014 and December 31, 2013:
		September 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	$	11,199			$	16,666			$	12,433		$	19,186
	Unsecured	291				301				176			202
	Real estate:
	One-to-four family residential	3,513				5,825				2,667			4,678
	Commercial & multifamily residential:
	Commercial land	488				788				442			783
	Income property	3,998				6,486				4,267			5,383
	Owner occupied	3,982				6,144				6,334			7,486
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	573				1,754				3,246			6,601
	Residential construction	458				1,928				459			1,928
	Consumer	3,496				4,980				3,991			6,187
	Total	$	27,998			$	44,872			$	34,015		$	52,434
Past Due Financing Receivables	'
	The following is an aging of the recorded investment of the noncovered loan portfolio as of September 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
	September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,740,253			$	6,484			$	394		$	—			$	6,878			$	11,199	$	1,758,330
	Unsecured	66,057				334				20			—				354				291		66,702
	Real estate:
	One-to-four family residential	103,040				259				—			—				259				3,513		106,812
	Commercial & multifamily residential:
	Commercial land	138,874				—				435			—				435				488		139,797
	Income property	1,201,919				8,517				90			—				8,607				3,998		1,214,524
	Owner occupied	760,234				519				739			—				1,258				3,982		765,474
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	12,431				—				—			—				—				573		13,004
	Residential construction	59,841				—				—			—				—				458		60,299
	Commercial & multifamily residential:
	Income property	85,090				—				—			—				—				—		85,090
	Owner occupied	51,420				—				—			—				—				—		51,420
	Consumer	313,536				601				93			—				694				3,496		317,726
	Total	$	4,532,695			$	16,714			$	1,771		$	—			$	18,485			$	27,998	$	4,579,178
		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 September 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
	September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,751,081			$	7,249			$	1,134		$	1,727			$	39			$	6,115	$	7,055
	Unsecured	66,691				11				11			11				11				—		—
	Real estate:
	One-to-four family residential	104,244				2,568				428			469				124				2,140		3,585
	Commercial & multifamily residential:
	Commercial land	139,709				88				—			—				—				88		398
	Income property	1,207,801				6,723				—			—				—				6,723		11,236
	Owner occupied	756,410				9,064				586			585				31				8,478		12,999
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	12,894				110				110			110				68				—		—
	Residential construction	60,299				—				—			—				—				—		—
	Commercial & multifamily residential:
	Income property	85,090				—				—			—				—				—		—
	Owner occupied	51,420				—				—			—				—				—		—
	Consumer	317,593				133				—			—				—				133		208
	Total	$	4,553,232			$	25,946			$	2,269		$	2,902			$	273			$	23,677	$	35,481
		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 nine month periods indicated.
		Three Months Ended September 30,															Nine Months Ended September 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	$	6,869			$	17			$	6,631		$	(25	)		$	6,550			$	50	$	5,774	$	12
Unsecured	15				—				47			1				23				1		68		2
Real estate:
One-to-four family residential	2,307				14				1,537			16				2,082				37		1,677		47
Commercial & multifamily residential:
Commercial land	94				—				1,456			48				102				—		2,085		48
Income property	7,345				69				10,358			22				6,891				205		9,534		168
Owner occupied	9,117				239				9,822			231				9,629				715		10,721		740
Real estate construction:
One-to-four family residential:
Land and acquisition	111				1				2,889			1				840				4		2,794		4
Residential construction	—				—				—			—				—				—		526		—
Consumer	142				2				423			2				152				7		275		5
Total	$	26,000			$	342			$	33,163		$	296			$	26,269			$	1,019	$	33,454	$	1,026
Analysis of loans classified as Troubled Debt Restructurings (bTDRb)	'
		Three Months Ended September 30,															Nine Months Ended September 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	$	6,869			$	17			$	6,631		$	(25	)		$	6,550			$	50	$	5,774	$	12
	Unsecured	15				—				47			1				23				1		68		2
	Real estate:
	One-to-four family residential	2,307				14				1,537			16				2,082				37		1,677		47
	Commercial & multifamily residential:
	Commercial land	94				—				1,456			48				102				—		2,085		48
	Income property	7,345				69				10,358			22				6,891				205		9,534		168
	Owner occupied	9,117				239				9,822			231				9,629				715		10,721		740
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	111				1				2,889			1				840				4		2,794		4
	Residential construction	—				—				—			—				—				—		526		—
	Consumer	142				2				423			2				152				7		275		5
	Total	$	26,000			$	342			$	33,163		$	296			$	26,269			$	1,019	$	33,454	$	1,026
	The following is an analysis of loans classified as troubled debt restructurings (“TDR”) during the three and nine months ended September 30, 2014 and 2013:
		Three months ended September 30, 2014										Three months ended September 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)
	Real estate:
	Commercial and multifamily residential:
	Owner occupied	1			$	1,496			$	1,496		—			$	—			$	—
	Total	1			$	1,496			$	1,496		—			$	—			$	—
		Nine months ended September 30, 2014										Nine months ended September 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			1,496				1,496			1			172				172
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	—			—				—			1			117				117
	Total	8			$	2,892			$	2,875		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)	9 Months Ended
	Sep. 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					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014		2013
		(in thousands)
	Balance at beginning of period	$	2,355	$	2,465		$	2,505	$	1,915
	Net changes in the allowance for unfunded commitments and letters of credit	150		200			—		750
	Balance at end of period	$	2,505	$	2,665		$	2,505	$	2,665
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2014 and December 31, 2013:
		Pass		Special Mention			Substandard		Doubtful			Loss		Total
	September 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	38,130	$	913		$	11,441	$	—		$	—	$	50,484
	Unsecured	2,316		—			91		—			—		2,407
	Real estate:
	One-to-four family residential	30,711		—			4,223		—			—		34,934
	Commercial and multifamily residential:
	Commercial land	9,913		—			6,246		—			—		16,159
	Income property	54,117		3,220			7,507		—			—		64,844
	Owner occupied	59,746		354			6,385		—			—		66,485
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	2,713		—			1,096		—			—		3,809
	Residential construction	750		—			1,239		—			—		1,989
	Commercial and multifamily residential:
	Income property	1,458		—			227		—			—		1,685
	Owner occupied	934		—			—		—			—		934
	Consumer	26,320		—			2,971		—			—		29,291
	Total	$	227,108	$	4,487		$	41,426	$	—		$	—	273,021
	Less:
	Valuation discount resulting from acquisition accounting													29,177
	Allowance for loan losses													17,933
	Covered loans, net													$	225,911
		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 nine months ended September 30, 2014 and 2013:
		Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
		Balance										Balance		Reserve		Allocation
	Three months ended September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	25,519	$	(1,348	)	$	333	$	243		$	24,747	$	39	$	24,708
	Unsecured	754		—			23		112			889		11		878
	Real estate:
	One-to-four family residential	1,083		—			63		230			1,376		124		1,252
	Commercial & multifamily residential:
	Commercial land	470		—			51		(124		)	397		—		397
	Income property	10,511		—			83		(784		)	9,810		—		9,810
	Owner occupied	4,990		(7		)	5		(193		)	4,795		31		4,764
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	403		—			3		876			1,282		68		1,214
	Residential construction	677		—			18		1,103			1,798		—		1,798
	Commercial & multifamily residential:
	Income property	414		—			—		535			949		—		949
	Owner occupied	166		—			—		168			334		—		334
	Consumer	2,643		(620		)	340		502			2,865		—		2,865
	Unallocated	1,864		—			—		(1,168		)	696		—		696
	Total	$	49,494	$	(1,975	)	$	919	$	1,500		$	49,938	$	273	$	49,665
		Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
		Balance										Balance		Reserve		Allocation
	Nine months ended September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	31,027	$	(3,188	)	$	2,216	$	(5,308	)	$	24,747	$	39	$	24,708
	Unsecured	696		(110		)	342		(39		)	889		11		878
	Real estate:
	One-to-four family residential	1,252		(207		)	103		228			1,376		124		1,252
	Commercial & multifamily residential:
	Commercial land	489		(29		)	70		(133		)	397		—		397
	Income property	9,234		(1,934		)	601		1,909			9,810		—		9,810
	Owner occupied	3,605		(1,030		)	44		2,176			4,795		31		4,764
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	610		—			44		628			1,282		68		1,214
	Residential construction	822		—			461		515			1,798		—		1,798
	Commercial & multifamily residential:
	Income property	285		—			—		664			949		—		949
	Owner occupied	58		—			—		276			334		—		334
	Consumer	2,547		(2,256		)	931		1,643			2,865		—		2,865
	Unallocated	1,655		—			—		(959		)	696		—		696
	Total	$	52,280	$	(8,754	)	$	4,812	$	1,600		$	49,938	$	273	$	49,665
		Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
		Balance										Balance		Reserve		Allocation
	Three months ended September 30, 2013	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	30,572	$	(392	)	$	743	$	3,187		$	34,110	$	241	$	33,869
	Unsecured	821		(363		)	111		491			1,060		43		1,017
	Real estate:
	One-to-four family residential	672		(47		)	39		677			1,341		103		1,238
	Commercial & multifamily residential:
	Commercial land	691		(9		)	126		(260		)	548		—		548
	Income property	9,695		(132		)	154		85			9,802		—		9,802
	Owner occupied	4,515		(516		)	52		637			4,688		26		4,662
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	769		—			366		(410		)	725		73		652
Residential construction	204		—			95		426			725		—		725
Commercial & multifamily residential:
Income property	241		—			—		17			258		—		258
Owner occupied	80		—			—		(12		)	68		—		68
Consumer	2,455		(453		)	112		405			2,519		—		2,519
Unallocated	983		—			—		(983		)	—		—		—
Total	$	51,698	$	(1,912	)	$	1,798	$	4,260		$	55,844	$	486	$	55,358
	Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
	Balance										Balance		Reserve		Allocation
Nine months ended September 30, 2013	(in thousands)
Noncovered loans:
Commercial business:
Secured	$	27,270	$	(2,236	)	$	1,135	$	7,941		$	34,110	$	241	$	33,869
Unsecured	753		(794		)	184		917			1,060		43		1,017
Real estate:
One-to-four family residential	694		(191		)	180		658			1,341		103		1,238
Commercial & multifamily residential:
Commercial land	460		(20		)	153		(45		)	548		—		548
Income property	11,033		(950		)	260		(541		)	9,802		—		9,802
Owner occupied	6,362		(1,084		)	96		(686		)	4,688		26		4,662
Real estate construction:
One-to-four family residential:
Land and acquisition	1,171		(32		)	2,541		(2,955		)	725		73		652
Residential construction	635		(101		)	108		83			725		—		725
Commercial & multifamily residential:
Income property	316		—			—		(58		)	258		—		258
Owner occupied	102		—			—		(34		)	68		—		68
Consumer	2,437		(1,262		)	353		991			2,519		—		2,519
Unallocated	1,011		—			—		(1,011		)	—		—		—
Total	$	52,244	$	(6,670	)	$	5,010	$	5,260		$	55,844	$	486	$	55,358
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our noncovered loan portfolio as of September 30, 2014 and December 31, 2013:
		Pass		Special Mention			Substandard		Doubtful			Loss		Total
	September 30, 2014	(in thousands)
	Noncovered loans:
	Commercial business:
	Secured	$	1,678,642	$	43,841		$	35,847	$	—		$	—	$	1,758,330
	Unsecured	66,261		198			243		—			—		66,702
	Real estate:
	One-to-four family residential	102,126		55			4,631		—			—		106,812
	Commercial and multifamily residential:
	Commercial land	137,651		—			2,146		—			—		139,797
	Income property	1,197,040		4,468			13,016		—			—		1,214,524
	Owner occupied	754,446		3,153			7,875		—			—		765,474
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	11,307		—			1,697		—			—		13,004
	Residential construction	57,205		—			3,094		—			—		60,299
	Commercial and multifamily residential:
	Income property	85,090		—			—		—			—		85,090
	Owner occupied	50,521		899			—		—			—		51,420
	Consumer	313,423		—			4,303		—			—		317,726
	Total	$	4,453,712	$	52,614		$	72,852	$	—		$	—	4,579,178
	Less:
	Allowance for loan and lease losses													49,938
	Noncovered loans, net													$	4,529,240
		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)	9 Months Ended
	Sep. 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 nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	15,203		$	24,339		$	23,834		$	10,676
	Established through acquisitions	—			—			—			14,708
	Transfers in, net of write-downs ($0, $48, $0 and $90, respectively)	475			4,413			2,809			9,190
	Additional OREO write-downs	(630		)	(1,066		)	(2,195		)	(1,636		)
	Proceeds from sale of OREO property	(6,229		)	(4,673		)	(16,527		)	(10,295		)
	Gain on sale of OREO, net	1,496			530			2,394			900
	Total noncovered OREO at end of period	$	10,315		$	23,543		$	10,315		$	23,543

Covered_Assets_and_FDIC_Losssh1

Covered Assets and FDIC Loss-sharing Asset (Tables)	9 Months Ended
	Sep. 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 September 30, 2014 and December 31, 2013:
		September 30, 2014			December 31, 2013
	Covered loans:	(in thousands)
	Commercial business	$	52,891		$	72,870
	Real estate:
	One-to-four family residential	34,934			41,642
	Commercial and multifamily residential	147,488			170,879
	Total real estate	182,422			212,521
	Real estate construction:
	One-to-four family residential	5,798			14,781
	Commercial and multifamily residential	2,619			6,869
	Total real estate construction	8,417			21,650
	Consumer	29,291			34,101
	Subtotal of covered loans	273,021			341,142
	Less:
	Valuation discount resulting from acquisition accounting	29,177			43,297
	Allowance for loan losses	17,933			20,174
	Covered loans, net of allowance for loan losses	$	225,911		$	277,671
Changes in Accretable Yield for Acquired Loans	'
	The following table shows the changes in accretable yield for acquired impaired loans for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	92,511		$	140,511		$	103,907		$	166,888
	Accretion	(8,034		)	(12,243		)	(28,658		)	(40,240		)
	Disposals	(357		)	(5,772		)	(3,183		)	(621		)
	Reclassifications (to) from nonaccretable difference	(3,589		)	(3,013		)	8,465			(6,544		)
	Balance at end of period	$	80,531		$	119,483		$	80,531		$	119,483
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2014 and December 31, 2013:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	September 30, 2014	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	38,130		$	913		$	11,441		$	—		$	—	$	50,484
	Unsecured	2,316			—			91			—			—		2,407
	Real estate:
	One-to-four family residential	30,711			—			4,223			—			—		34,934
	Commercial and multifamily residential:
	Commercial land	9,913			—			6,246			—			—		16,159
	Income property	54,117			3,220			7,507			—			—		64,844
	Owner occupied	59,746			354			6,385			—			—		66,485
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	2,713			—			1,096			—			—		3,809
	Residential construction	750			—			1,239			—			—		1,989
	Commercial and multifamily residential:
	Income property	1,458			—			227			—			—		1,685
	Owner occupied	934			—			—			—			—		934
	Consumer	26,320			—			2,971			—			—		29,291
	Total	$	227,108		$	4,487		$	41,426		$	—		$	—	273,021
	Less:
	Valuation discount resulting from acquisition accounting															29,177
	Allowance for loan losses															17,933
	Covered loans, net															$	225,911
		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 nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Covered OREO:
	Balance at beginning of period	$	13,051		$	12,854		$	12,093		$	16,311
	Transfers in	614			3,559			6,121			8,089
	Write-downs	(37		)	(199		)	(1,025		)	(293		)
	Proceeds from sale of OREO property	(2,526		)	(5,408		)	(8,161		)	(19,222		)
	Net gain on sale of OREO	487			1,924			2,561			7,845
	Total covered OREO at end of period	$	11,589		$	12,730		$	11,589		$	12,730
FDIC Loss-sharing Asset	'
	The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and nine months ended September 30, 2014 and 2013:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	27,981		$	67,374		$	39,846		$	96,354
	Adjustments not reflected in income:
	Cash payments to (from) the FDIC	541			(1,484		)	(1,223		)	(7,871		)
	FDIC reimbursable losses (recoveries), net	(214		)	(505		)	(446		)	522
	Adjustments reflected in income:
	Amortization, net	(3,992		)	(9,890		)	(16,208		)	(29,470		)
	Loan impairment (recapture)	(416		)	(758		)	2,735			(1,343		)
	Sale of other real estate	(383		)	(1,479		)	(2,104		)	(5,076		)
	Write-downs of other real estate	67			220			860			373
	Other	(92		)	81			32			70
	Balance at end of period	$	23,492		$	53,559		$	23,492		$	53,559
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 nine months ended September 30, 2014 and 2013 are summarized as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Balance at beginning of period	$	19,801		$	26,135		$	20,174		$	30,056
	Loans charged off	(3,236		)	(5,006		)	(11,350		)	(10,031		)
	Recoveries	1,888			2,555			5,690			4,391
	Provision (recapture) for loan losses	(520		)	(947		)	3,419			(1,679		)
	Balance at end of period	$	17,933		$	22,737		$	17,933		$	22,737

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 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 September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
		(in thousands)
	Goodwill
	Goodwill at beginning of period (1)	$	343,952		$	343,952		$	343,952		$	115,554
	Established through acquisitions (1)	—			—			—			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			47,698			47,698			32,441
	Accumulated amortization at beginning of period	(25,825		)	(19,441		)	(22,765		)	(16,720		)
	Core deposit intangible, net at beginning of period	21,873			28,257			24,933			15,721
	Established through acquisitions	—			—			—			15,257
	CDI current period amortization	(1,456		)	(1,667		)	(4,516		)	(4,388		)
	Total core deposit intangible, net at end of period	20,417			26,590			20,417			26,590
	Intangible assets not subject to amortization	919			919			919			919
	Other intangible assets, net at end of period	21,336			27,509			21,336			27,509
	Total goodwill and other intangible assets at end of period	$	365,288		$	371,461		$	365,288		$	371,461
Estimated Future Amortization Expense of Core Deposit Intangibles	'
	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2014 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2014	$	1,447
	2015	4,934
	2016	4,195
	2017	3,361
	2018	2,500

Derivatives_and_Balance_Sheet_1

Derivatives and Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 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
	September 30, 2014	(in thousands)
	Assets
	Interest rate contracts	$	9,472			$	—		$	9,472	$	—			$	9,472
	Liabilities
	Interest rate contracts	$	9,472			$	—		$	9,472	$	(9,472	)		$	—
	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 September 30, 2014 and December 31, 2013:
		Asset Derivatives									Liability Derivatives
		September 30, 2014						December 31, 2013			September 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		$	9,472			Other assets	$	9,044	Other liabilities		$	9,472			Other liabilities	$	9,044

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 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 nine month periods ended September 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 September 30, 2014	(in thousands)
	Beginning balance	$	5,448		$	(1,888	)	$	3,560
	Other comprehensive loss before reclassifications	(4,057		)	—			(4,057		)
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(21		)	23			2
	Net current-period other comprehensive income (loss)	(4,078		)	23			(4,055		)
	Ending balance	$	1,370		$	(1,865	)	$	(495	)
	Three months ended September 30, 2013
	Beginning balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Other comprehensive income before reclassifications	5,943			—			5,943
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	—			59			59
	Net current-period other comprehensive income	5,943			59			6,002
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	Nine months ended September 30, 2014
	Beginning balance	$	(10,108	)	$	(1,936	)	$	(12,044	)
	Other comprehensive income before reclassifications	11,830			—			11,830
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(352		)	71			(281		)
	Net current-period other comprehensive income	11,478			71			11,549
	Ending balance	$	1,370		$	(1,865	)	$	(495	)
	Nine months ended September 30, 2013
	Beginning balance	$	20,918		$	(769	)	$	20,149
	Other comprehensive loss before reclassifications	(22,480		)	(756		)	(23,236		)
	Amounts reclassified from accumulated other comprehensive income (loss) (2)	(299		)	178			(121		)
	Net current-period other comprehensive loss	(22,779		)	(578		)	(23,357		)
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	__________
	(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 September 30, 2014 and 2013:
		Amount Reclassified from Accumulated Other Comprehensive Loss
		Three Months Ended September 30,						Nine Months Ended September 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	$	33		$	—		$	552		$	462		Investment securities gains, net
		33			—			552			462			Total before tax
		(12		)	—			(200		)	(163		)	Income tax provision
		$	21		$	—		$	352		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(36	)	$	(92	)	$	(111	)	$	(276	)	Compensation and employee benefits
		(36		)	(92		)	(111		)	(276		)	Total before tax
		13			33			40			98			Income tax benefit
		$	(23	)	$	(59	)	$	(71	)	$	(178	)	Net of tax

Fair_Value_Accounting_and_Meas1

Fair Value Accounting and Measurement (Tables)	9 Months Ended
	Sep. 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 September 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
	September 30, 2014	(in thousands)
	Assets
	Securities available for sale:
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	862,466	$	—		$	862,466	$	—
	State and municipal debt securities	389,497		—			389,497		—
	U.S. government agency and government-sponsored enterprise securities	333,999		—			333,999		—
	U.S. government securities	20,304		20,304			—		—
	Other securities	5,145		—			5,145		—
	Total securities available for sale	$	1,611,411	$	20,304		$	1,591,107	$	—
	Other assets (Interest rate contracts)	$	9,472	$	—		$	9,472	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	9,472	$	—		$	9,472	$	—
		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 information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:
		Fair value at September 30, 2014		Fair Value Measurements at Reporting Date Using							Gains (Losses) During the Three Months Ended			Losses During the Nine Months Ended
				Level 1			Level 2		Level 3		30-Sep-14			30-Sep-14
		(in thousands)
	Impaired loans	$	2,998	$	—		$	—	$	2,998	$	69		$	(14	)
	Noncovered OREO	2,535		—			—		2,535		(351		)	(351		)
	Covered OREO	415		—			—		415		(37		)	(37		)
		$	5,948	$	—		$	—	$	5,948	$	(319	)	$	(402	)
		Fair value at		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended			Losses During the Nine Months Ended September 30, 2013
		September 30, 2013		Level 1			Level 2		Level 3		30-Sep-13
		(in thousands)
	Noncovered OREO	$	3,714	$	—		$	—	$	3,714	$	(1,040	)	$	(1,084	)
	Covered OREO	544		—			—		544		(183		)	(248		)
		$	4,258	$	—		$	—	$	4,258	$	(1,223	)	$	(1,332	)
Fair Value, by Balance Sheet Grouping	'
	The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at September 30, 2014 and December 31, 2013:
		September 30, 2014
		Carrying		Fair			Level 1		Level 2		Level 3
		Amount		Value
		(in thousands)
	Assets
	Cash and due from banks	$	157,817	$	157,817		$	157,817	$	—	$	—
	Interest-earning deposits with banks	105,631		105,631			105,631		—		—
	Securities available for sale	1,611,411		1,611,411			20,304		1,591,107		—
	FHLB stock	31,592		31,592			—		31,592		—
	Loans held for sale	949		949			—		949		—
	Loans	4,755,151		4,862,053			—		—		4,862,053
	FDIC loss-sharing asset	23,492		9,385			—		—		9,385
	Interest rate contracts	9,472		9,472			—		9,472		—
	Liabilities
	Deposits	$	6,244,401	$	6,242,655		$	5,794,399	$	448,256	$	—
	FHLB Advances	6,578		7,105			—		7,105		—
	Repurchase agreements	25,000		26,167			—		26,167		—
	Interest rate contracts	9,472		9,472			—		9,472		—
		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 September 30, 2014		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(dollars in thousands)
	Impaired loans - real estate collateral	$	534	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Impaired loans - other collateral (3)	2,464		Fair Market Value of Collateral		Adjustment to Stated value	0% - 71% (49%)
	Noncovered OREO	2,535		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Covered OREO	415		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, inventory and equipment.
		Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		September 30, 2013
		(dollars in thousands)
	Noncovered OREO	$	3,714	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Covered OREO	544		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.

Earnings_per_Common_Share_Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 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 nine months ended September 30, 2014 and 2013:
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
			(in thousands except per share)
	Basic EPS:
	Net income		$	21,583	$	13,276	$	62,654	$	40,043
	Less: Earnings allocated to participating securities
	Preferred shares		42		27		121		58
	Nonvested restricted shares		216		109		598		355
	Earnings allocated to common shareholders		$	21,325	$	13,140	$	61,935	$	39,630
	Weighted average common shares outstanding		52,112		50,834		51,772		47,032
	Basic earnings per common share		$	0.41	$	0.26	$	1.2	$	0.84
	Diluted EPS:
	Earnings allocated to common shareholders (1)		$	21,325	$	13,142	$	61,940	$	39,635
	Weighted average common shares outstanding		52,112		50,834		51,772		47,032
	Dilutive effect of equity awards		404		1,463		707		915
	Weighted average diluted common shares outstanding		52,516		52,297		52,479		47,947
	Diluted earnings per common share		$	0.41	$	0.25	$	1.18	$	0.83
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive		58		138		67		99
	__________
	-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.

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies Correction of immaterial error (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Correction of immaterial error, pre-tax increase to interest income on taxable securities	$2.60

Business_combinations_Details

Business combinations (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Apr. 01, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 01, 2013
Business Acquisition [Line Items]	'	'	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	'	'	'	'	100.00%
Business Acquisition, Pro Forma Net Income (Loss)	'	'	'	'	$53,053,000	'
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	'	'	'	'	252,392,000	'
Business Acquisition, Pro Forma Earnings Per Share, Basic	'	'	'	'	$1.04	'
Business Acquisition, Pro Forma Earnings Per Share, Diluted	'	'	'	'	$1.01	'
Business Combination, Acquisition Related Costs	'	2,800,000	7,600,000	4,400,000	17,600,000	'
Intermountain Community Bancorp [Member]	'	'	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'	'	'
Business Combination, Acquisition Related Costs	'	$459,000	'	'	'	'

Securities_Securities_Availabl

Securities (Securities Available for Sale) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available-for-sale, amortized cost	$1,609,784	$1,680,491
Available-for-sale Debt Securities Gross Unrealized Gain, instant	22,541	22,551
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-20,914	-38,931
Securities available for sale	1,611,411	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]	'	'
Securities available-for-sale, amortized cost	867,583	961,442
Available-for-sale Debt Securities Gross Unrealized Gain, instant	7,950	10,640
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-13,067	-23,674
Securities available for sale	862,466	948,408
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available-for-sale, amortized cost	376,862	357,013
Available-for-sale Debt Securities Gross Unrealized Gain, instant	14,101	11,450
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-1,466	-3,993
Securities available for sale	389,497	364,470
U.S. Government and Government-Sponsored Enterprise Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available-for-sale, amortized cost	339,152	335,671
Available-for-sale Debt Securities Gross Unrealized Gain, instant	467	434
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-5,620	-10,066
Securities available for sale	333,999	326,039
US Government Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available-for-sale, amortized cost	20,903	21,081
Available-for-sale Debt Securities Gross Unrealized Gain, instant	1	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-600	-967
Securities available for sale	20,304	20,114
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities available-for-sale, amortized cost	5,284	5,284
Available-for-sale Debt Securities Gross Unrealized Gain, instant	22	27
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	-161	-231
Securities available for sale	$5,145	$5,080

Securities_Schedule_of_Contrac

Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Available-for-sale Securities [Abstract]	'
Due within one year, Amortized Cost	$12,863
Due after one year through five years, Amortized Cost	357,261
Due after five years through ten years, Amortized Cost	443,780
Due after ten years, Amortized Cost	790,596
No stated maturity date, Amortized Cost Basis	5,284
Total investment securities available-for-sale, Amortized Cost	1,609,784
Due within one year, Fair Value	12,945
Due after one year through five years, Fair Value	356,376
Due after five years through ten years, Fair Value	443,165
Due after ten years, Fair Value	793,779
No stated maturity date, Fair Value	5,146
Total investment securities available-for-sale, Fair Value	$1,611,411

Securities_Carrying_Value_of_S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$372,177
Washington and Oregon State Public Deposits [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	286,337
Federal Reserve Bank Advances [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	41,352
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$44,488

Securities_Summary_of_Gross_Un

Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) (USD $)	Sep. 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	$22,541	$22,551
Less than 12 Months Fair Value	242,579	887,693
Less than 12 Months Unrealized Losses	-1,590	-23,148
12 Months or More Fair Value	591,058	166,348
12 Months or More Unrealized Losses	-19,324	-15,783
Total Fair Value	833,637	1,054,041
Total Unrealized Losses	-20,914	-38,931
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	20,914	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	7,950	10,640
Less than 12 Months Fair Value	162,583	492,921
Less than 12 Months Unrealized Losses	-1,219	-10,991
12 Months or More Fair Value	283,292	121,303
12 Months or More Unrealized Losses	-11,848	-12,684
Total Fair Value	445,875	614,224
Total Unrealized Losses	-13,067	-23,675
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	13,067	23,674
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	14,101	11,450
Less than 12 Months Fair Value	29,307	112,400
Less than 12 Months Unrealized Losses	-170	-3,069
12 Months or More Fair Value	52,322	13,815
12 Months or More Unrealized Losses	-1,296	-923
Total Fair Value	81,629	126,215
Total Unrealized Losses	-1,466	-3,992
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,466	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	467	434
Less than 12 Months Fair Value	50,689	260,001
Less than 12 Months Unrealized Losses	-201	-8,063
12 Months or More Fair Value	231,082	28,447
12 Months or More Unrealized Losses	-5,419	-2,003
Total Fair Value	281,771	288,448
Total Unrealized Losses	-5,620	-10,066
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,620	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	19,253	0
12 Months or More Unrealized Losses	-600	0
Total Fair Value	19,253	20,114
Total Unrealized Losses	-600	-967
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	600	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	5,109	2,783
12 Months or More Unrealized Losses	-161	-173
Total Fair Value	5,109	5,040
Total Unrealized Losses	-161	-231
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$161	$231

Securities_Narrative_Details

Securities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$25,100	$0	$55,800	$166,900
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	66	'	66	'
Number Of Securities In Continuous Loss Position For Twelve Months or More	43	'	43	'
Municipal Bonds [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Number Of Securities In Unrealized Loss Position	74	'	74	'
Number Of Securities In Continuous Loss Position For Twelve Months or More	56	'	56	'
U.S. Government and Government-Sponsored Enterprise Securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Number Of Securities In Unrealized Loss Position	29	'	29	'
Number Of Securities In Continuous Loss Position For Twelve Months or More	20	'	20	'
US Government Securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Number Of Securities In Unrealized Loss Position	2	'	2	'
Number Of Securities In Continuous Loss Position For Twelve Months or More	2	'	2	'
Other Securities [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Number Of Securities In Unrealized Loss Position	2	'	2	'
Number Of Securities In Continuous Loss Position For Twelve Months or More	2	'	2	'

Securities_Securities_Summary_

Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Available-for-sale Securities, Gross Realized Gains	$33	$0	$552	$632
Available-for-sale Securities, Gross Realized Losses	0	0	0	-170
Gain (Loss) on Sale of Securities, Net	$33	$0	$552	$462

Noncovered_Loans_Narrative_Det

Noncovered Loans (Narrative) (Details) (USD $)	9 Months Ended					3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 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	$5,019,000	$3,581,000	'	'	'	($520,000)	($947,000)	$3,419,000	($1,679,000)
Loans to related parties	12,100,000	'	14,200,000	'	'	'	'	'	'
Loans and Leases Receivable, Related Parties, Additions	1,700,000	'	'	'	'	'	'	'	'
Repayments on related party loans	3,800,000	'	'	'	'	'	'	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	'	'	'	1,040,000,000	1,080,000,000	'	'	'	'
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	'	'	'	38,300,000	45,200,000	'	'	'	'
Additional funds committed to lend on loans classified as TDR	$92,000	'	$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 $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	$53,076	'	$68,282	'	'	'
Loans, net	4,755,151	'	4,444,842	'	'	'
Loans held for sale	949	'	735	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	53,076	'	68,282	'	'	'
Recorded Investment	4,579,178	'	4,219,451	'	'	'
Allowance for loan losses	49,938	49,494	52,280	55,844	51,698	52,244
Loans, net	4,529,240	'	4,167,171	'	'	'
Loans held for sale	949	'	735	'	'	'
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	108,743	'	108,317	'	'	'
Loans and Leases Receivable, Gross, Consumer, Construction	73,882	'	54,155	'	'	'
Allowance for loan losses	1,376	1,083	1,252	1,341	672	694
Commercial and Multifamily Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial, Mortgage	2,144,044	'	2,080,075	'	'	'
Loans Receivable, Gross, Commercial, Construction	137,366	'	126,390	'	'	'
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial and Industrial	1,829,393	'	1,561,782	'	'	'
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Mortgage	2,252,787	'	2,188,392	'	'	'
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Construction	211,248	'	180,545	'	'	'
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer	338,826	'	357,014	'	'	'
Allowance for loan losses	$2,865	$2,643	$2,547	$2,519	$2,455	$2,437

Noncovered_Loans_Analysis_of_N

Noncovered Loans (Analysis of Nonaccrual Loans) (Details) (Noncovered Loans [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	$27,998	$34,015
Unpaid Principal Balance Nonaccrual Loans	44,872	52,434
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,496	3,991
Unpaid Principal Balance Nonaccrual Loans	4,980	6,187
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	11,199	12,433
Unpaid Principal Balance Nonaccrual Loans	16,666	19,186
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	291	176
Unpaid Principal Balance Nonaccrual Loans	301	202
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,513	2,667
Unpaid Principal Balance Nonaccrual Loans	5,825	4,678
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	488	442
Unpaid Principal Balance Nonaccrual Loans	788	783
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,998	4,267
Unpaid Principal Balance Nonaccrual Loans	6,486	5,383
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,982	6,334
Unpaid Principal Balance Nonaccrual Loans	6,144	7,486
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	573	3,246
Unpaid Principal Balance Nonaccrual Loans	1,754	6,601
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	458	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 $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	$4,532,695	$4,158,873
30 - 59 Days Past Due	16,714	20,754
60 - 89 Days Past Due	1,771	5,809
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	18,485	26,563
Nonaccrual Loans	27,998	34,015
Loans Receivable, Net	4,579,178	4,219,451
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	313,536	322,685
30 - 59 Days Past Due	601	835
60 - 89 Days Past Due	93	823
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	694	1,658
Nonaccrual Loans	3,496	3,991
Loans Receivable, Net	317,726	328,334
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,740,253	1,457,820
30 - 59 Days Past Due	6,484	12,713
60 - 89 Days Past Due	394	681
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	6,878	13,394
Nonaccrual Loans	11,199	12,433
Loans Receivable, Net	1,758,330	1,483,647
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	66,057	72,255
30 - 59 Days Past Due	334	156
60 - 89 Days Past Due	20	17
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	354	173
Nonaccrual Loans	291	176
Loans Receivable, Net	66,702	72,604
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	103,040	100,591
30 - 59 Days Past Due	259	1,993
60 - 89 Days Past Due	0	641
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	259	2,634
Nonaccrual Loans	3,513	2,667
Loans Receivable, Net	106,812	105,892
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	138,874	142,034
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	435	358
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	435	358
Nonaccrual Loans	488	442
Loans Receivable, Net	139,797	142,834
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,201,919	1,138,732
30 - 59 Days Past Due	8,517	144
60 - 89 Days Past Due	90	3,289
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	8,607	3,433
Nonaccrual Loans	3,998	4,267
Loans Receivable, Net	1,214,524	1,146,432
Owner Occupied Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	51,420	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	51,420	38,916
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	760,234	749,561
30 - 59 Days Past Due	519	4,714
60 - 89 Days Past Due	739	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	1,258	4,714
Nonaccrual Loans	3,982	6,334
Loans Receivable, Net	765,474	760,609
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	12,431	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	573	3,246
Loans Receivable, Net	13,004	11,670
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	59,841	41,533
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	458	459
Loans Receivable, Net	60,299	41,992
Income Property Multifamily Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	85,090	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	$85,090	$86,521

Noncovered_Loans_Analysis_of_I

Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	$4,553,232	'	$4,553,232	'	$4,193,062
Recorded Investment of Loans Individually Measured for Specific Impairment	25,946	'	25,946	'	26,389
Recorded Investment	0	'	0	'	23
Unpaid Principal Balance	0	'	0	'	27
Related Allowance	0	'	0	'	4
Average Recorded Investment Impaired Loans	26,000	33,163	26,269	33,454	'
Interest Recognized on Impaired Loans	342	296	1,019	1,026	'
Income Property Multifamily Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	85,090	'	85,090	'	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	317,593	'	317,593	'	328,167
Recorded Investment of Loans Individually Measured for Specific Impairment	133	'	133	'	167
Average Recorded Investment Impaired Loans	142	423	152	275	'
Interest Recognized on Impaired Loans	2	2	7	5	'
Residential Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	60,299	'	60,299	'	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	0	0	526	'
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	12,894	'	12,894	'	9,726
Recorded Investment of Loans Individually Measured for Specific Impairment	110	'	110	'	1,944
Recorded Investment	110	'	110	'	113
Unpaid Principal Balance	110	'	110	'	113
Related Allowance	68	'	68	'	71
Average Recorded Investment Impaired Loans	111	2,889	840	2,794	'
Interest Recognized on Impaired Loans	1	1	4	4	'
Owner Occupied [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	756,410	'	756,410	'	749,601
Recorded Investment of Loans Individually Measured for Specific Impairment	9,064	'	9,064	'	11,008
Recorded Investment	586	'	586	'	3,802
Unpaid Principal Balance	585	'	585	'	3,817
Related Allowance	31	'	31	'	1,073
Average Recorded Investment Impaired Loans	9,117	9,822	9,629	10,721	'
Interest Recognized on Impaired Loans	239	231	715	740	'
Owner Occupied Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	51,420	'	51,420	'	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	1,207,801	'	1,207,801	'	1,140,019
Recorded Investment of Loans Individually Measured for Specific Impairment	6,723	'	6,723	'	6,413
Recorded Investment	0	'	0	'	918
Unpaid Principal Balance	0	'	0	'	933
Related Allowance	0	'	0	'	26
Average Recorded Investment Impaired Loans	7,345	10,358	6,891	9,534	'
Interest Recognized on Impaired Loans	69	22	205	168	'
Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	139,709	'	139,709	'	142,719
Recorded Investment of Loans Individually Measured for Specific Impairment	88	'	88	'	115
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Related Allowance	0	'	0	'	0
Average Recorded Investment Impaired Loans	94	1,456	102	2,085	'
Interest Recognized on Impaired Loans	0	48	0	48	'
One-to-Four Family Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	104,244	'	104,244	'	104,272
Recorded Investment of Loans Individually Measured for Specific Impairment	2,568	'	2,568	'	1,620
Recorded Investment	428	'	428	'	442
Unpaid Principal Balance	469	'	469	'	479
Related Allowance	124	'	124	'	138
Average Recorded Investment Impaired Loans	2,307	1,537	2,082	1,677	'
Interest Recognized on Impaired Loans	14	16	37	47	'
Unsecured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	66,691	'	66,691	'	72,569
Recorded Investment of Loans Individually Measured for Specific Impairment	11	'	11	'	35
Recorded Investment	11	'	11	'	35
Unpaid Principal Balance	11	'	11	'	35
Related Allowance	11	'	11	'	35
Average Recorded Investment Impaired Loans	15	47	23	68	'
Interest Recognized on Impaired Loans	0	1	1	2	'
Secured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,751,081	'	1,751,081	'	1,478,560
Recorded Investment of Loans Individually Measured for Specific Impairment	7,249	'	7,249	'	5,087
Recorded Investment	1,134	'	1,134	'	2,866
Unpaid Principal Balance	1,727	'	1,727	'	2,885
Related Allowance	39	'	39	'	343
Average Recorded Investment Impaired Loans	6,869	6,631	6,550	5,774	'
Interest Recognized on Impaired Loans	17	-25	50	12	'
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	23,677	'	23,677	'	18,190
Unpaid Principal Balance	35,481	'	35,481	'	26,223
Impaired Loans With Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	2,269	'	2,269	'	8,199
Unpaid Principal Balance	2,902	'	2,902	'	8,289
Related Allowance	273	'	273	'	1,690
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	133	'	133	'	144
Unpaid Principal Balance	208	'	208	'	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	8,478	'	8,478	'	7,206
Unpaid Principal Balance	12,999	'	12,999	'	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	6,723	'	6,723	'	5,495
Unpaid Principal Balance	11,236	'	11,236	'	7,885
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	88	'	88	'	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	2,140	'	2,140	'	1,178
Unpaid Principal Balance	3,585	'	3,585	'	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	6,115	'	6,115	'	2,221
Unpaid Principal Balance	$7,055	'	$7,055	'	$2,560

Noncovered_Loans_Noncovered_Lo

Noncovered Loans Noncovered Loans (Analysis of Troubled Debt Restructurings) (Details) (Noncovered Loans [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Modifications	Modifications	Modifications	Modifications
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	1	0	8	7
Pre-Modification Outstanding Recorded Investment	$1,496	$0	$2,892	$1,712
Post-Modification Outstanding Recorded Investment	1,496	0	2,875	1,712
Secured Loans [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	'	'	4	1
Pre-Modification Outstanding Recorded Investment	'	'	759	343
Post-Modification Outstanding Recorded Investment	'	'	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
Pre-Modification Outstanding Recorded Investment	'	'	0	137
Post-Modification Outstanding Recorded Investment	'	'	0	137
Income Property Multifamily [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	'	'	1	3
Pre-Modification Outstanding Recorded Investment	'	'	143	943
Post-Modification Outstanding Recorded Investment	'	'	126	943
Owner Occupied [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of TDR Modifications	1	0	1	1
Pre-Modification Outstanding Recorded Investment	1,496	0	1,496	172
Post-Modification Outstanding Recorded Investment	1,496	0	1,496	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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
Provision for loan and lease losses	'	'	$5,019	$3,581
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	$1,500	$4,260	$1,600	$5,260

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Provision for loan and lease losses	'	'	$5,019	$3,581
Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	49,494	51,698	52,280	52,244
Charged-offs	-1,975	-1,912	-8,754	-6,670
Recoveries	919	1,798	4,812	5,010
Provision for loan and lease losses	1,500	4,260	1,600	5,260
Ending balance	49,938	55,844	49,938	55,844
Specific Reserve	273	486	273	486
General Allocation	49,665	55,358	49,665	55,358
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	2,643	2,455	2,547	2,437
Charged-offs	-620	-453	-2,256	-1,262
Recoveries	340	112	931	353
Provision for loan and lease losses	502	405	1,643	991
Ending balance	2,865	2,519	2,865	2,519
Specific Reserve	0	0	0	0
General Allocation	2,865	2,519	2,865	2,519
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	1,864	983	1,655	1,011
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	-1,168	-983	-959	-1,011
Ending balance	696	0	696	0
Specific Reserve	0	0	0	0
General Allocation	696	0	696	0
Secured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	25,519	30,572	31,027	27,270
Charged-offs	-1,348	-392	-3,188	-2,236
Recoveries	333	743	2,216	1,135
Provision for loan and lease losses	243	3,187	-5,308	7,941
Ending balance	24,747	34,110	24,747	34,110
Specific Reserve	39	241	39	241
General Allocation	24,708	33,869	24,708	33,869
Unsecured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	754	821	696	753
Charged-offs	0	-363	-110	-794
Recoveries	23	111	342	184
Provision for loan and lease losses	112	491	-39	917
Ending balance	889	1,060	889	1,060
Specific Reserve	11	43	11	43
General Allocation	878	1,017	878	1,017
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	1,083	672	1,252	694
Charged-offs	0	-47	-207	-191
Recoveries	63	39	103	180
Provision for loan and lease losses	230	677	228	658
Ending balance	1,376	1,341	1,376	1,341
Specific Reserve	124	103	124	103
General Allocation	1,252	1,238	1,252	1,238
Commercial Land [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	470	691	489	460
Charged-offs	0	-9	-29	-20
Recoveries	51	126	70	153
Provision for loan and lease losses	-124	-260	-133	-45
Ending balance	397	548	397	548
Specific Reserve	0	0	0	0
General Allocation	397	548	397	548
Income Property Multifamily [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	10,511	9,695	9,234	11,033
Charged-offs	0	-132	-1,934	-950
Recoveries	83	154	601	260
Provision for loan and lease losses	-784	85	1,909	-541
Ending balance	9,810	9,802	9,810	9,802
Specific Reserve	0	0	0	0
General Allocation	9,810	9,802	9,810	9,802
Owner Occupied [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	4,990	4,515	3,605	6,362
Charged-offs	-7	-516	-1,030	-1,084
Recoveries	5	52	44	96
Provision for loan and lease losses	-193	637	2,176	-686
Ending balance	4,795	4,688	4,795	4,688
Specific Reserve	31	26	31	26
General Allocation	4,764	4,662	4,764	4,662
Land And Acquisition [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	403	769	610	1,171
Charged-offs	0	0	0	-32
Recoveries	3	366	44	2,541
Provision for loan and lease losses	876	-410	628	-2,955
Ending balance	1,282	725	1,282	725
Specific Reserve	68	73	68	73
General Allocation	1,214	652	1,214	652
Residential Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	677	204	822	635
Charged-offs	0	0	0	-101
Recoveries	18	95	461	108
Provision for loan and lease losses	1,103	426	515	83
Ending balance	1,798	725	1,798	725
Specific Reserve	0	0	0	0
General Allocation	1,798	725	1,798	725
Income Property Multifamily Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	414	241	285	316
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	535	17	664	-58
Ending balance	949	258	949	258
Specific Reserve	0	0	0	0
General Allocation	949	258	949	258
Owner Occupied Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	166	80	58	102
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	168	-12	276	-34
Ending balance	334	68	334	68
Specific Reserve	0	0	0	0
General Allocation	$334	$68	$334	$68

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit	'	'	'	'
Beginning balance	$2,355	$2,465	$2,505	$1,915
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	150	200	0	750
Ending balance	$2,505	$2,665	$2,505	$2,665

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 $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans, net	$4,755,151	'	$4,444,842	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,579,178	'	4,219,451	'	'	'
Recorded Investment	4,579,178	'	4,219,451	'	'	'
Loans and Leases Receivable, Allowance	49,938	49,494	52,280	55,844	51,698	52,244
Loans, net	4,529,240	'	4,167,171	'	'	'
Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,453,712	'	4,027,764	'	'	'
Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	52,614	'	53,231	'	'	'
Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	72,852	'	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	317,726	'	328,334	'	'	'
Loans and Leases Receivable, Allowance	2,865	2,643	2,547	2,519	2,455	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	313,423	'	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	0	'	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	4,303	'	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	1,758,330	'	1,483,647	'	'	'
Loans and Leases Receivable, Allowance	24,747	25,519	31,027	34,110	30,572	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	1,678,642	'	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	43,841	'	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	35,847	'	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	66,702	'	72,604	'	'	'
Loans and Leases Receivable, Allowance	889	754	696	1,060	821	753
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	66,261	'	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	198	'	199	'	'	'
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	243	'	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	106,812	'	105,892	'	'	'
Loans and Leases Receivable, Allowance	1,376	1,083	1,252	1,341	672	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	102,126	'	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	4,631	'	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	139,797	'	142,834	'	'	'
Loans and Leases Receivable, Allowance	397	470	489	548	691	460
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	137,651	'	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	2,146	'	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	1,214,524	'	1,146,432	'	'	'
Loans and Leases Receivable, Allowance	9,810	10,511	9,234	9,802	9,695	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	1,197,040	'	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	4,468	'	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	13,016	'	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	765,474	'	760,609	'	'	'
Loans and Leases Receivable, Allowance	4,795	4,990	3,605	4,688	4,515	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	754,446	'	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	3,153	'	0	'	'	'
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7,875	'	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	13,004	'	11,670	'	'	'
Loans and Leases Receivable, Allowance	1,282	403	610	725	769	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	11,307	'	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	1,697	'	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	60,299	'	41,992	'	'	'
Loans and Leases Receivable, Allowance	1,798	677	822	725	204	635
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	57,205	'	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	3,094	'	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	85,090	'	86,521	'	'	'
Loans and Leases Receivable, Allowance	949	414	285	258	241	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	85,090	'	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	51,420	'	38,916	'	'	'
Loans and Leases Receivable, Allowance	334	166	58	68	80	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	50,521	'	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	899	'	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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Real Estate Owned [Line Items]	'	'	'	'
Other Real Estate Owned, established through acquisition	$0	$0	$0	$14,708
Balance, beginning of period	'	'	35,927	'
Proceeds from sale of OREO property	'	'	-16,527	-10,779
Gain (loss) on sale of OREO	'	'	4,955	8,745
Total OREO, end of period	21,904	'	21,904	'
Noncovered Loans [Member]	'	'	'	'
Other Real Estate Owned [Line Items]	'	'	'	'
Balance, beginning of period	15,203	24,339	23,834	10,676
Transfers in, net of write-downs ($0, $48, $0 and $90, respectively)	475	4,413	2,809	9,190
Transfers in, write-downs	0	48	0	90
Additional OREO write-down	-630	-1,066	-2,195	-1,636
Proceeds from sale of OREO property	-6,229	-4,673	-16,527	-10,295
Gain (loss) on sale of OREO	1,496	530	2,394	900
Total OREO, end of period	$10,315	$23,543	$10,315	$23,543

Covered_Assets_and_FDIC_Losssh2

Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Amount of Estimated Clawback Liability	$4,200,000	'	$4,200,000	'
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition	'	'	'10 years 45 days	'
Provision for loan and lease losses	'	'	5,019,000	3,581,000
Federal deposit insurance corporation loss-sharing indemnified assets	19,800,000	'	19,800,000	'
Federal deposit insurance corporation loss-sharing indemnified assets receivable	3,700,000	'	3,700,000	'
FDIC Loss-sharing Asset, Period Increase (Decrease)	416,000	'	'	'
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	-520,000	-947,000	3,419,000	-1,679,000
Impairment expenses	'	'	320,000	'
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 $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans, net	$4,755,151	'	$4,444,842	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	273,021	'	341,142	'	'	'
Valuation discount on covered loans	29,177	'	43,297	'	'	'
Allowance for loan losses	17,933	19,801	20,174	22,737	26,135	30,056
Loans, net	225,911	'	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	52,891	'	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	182,422	'	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	5,798	'	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	2,619	'	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	8,417	'	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	29,291	'	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	34,934	'	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	$147,488	'	$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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$92,511	$140,511	$103,907	$166,888
Accretion	-8,034	-12,243	-28,658	-40,240
Disposals	-357	-5,772	-3,183	-621
Reclassifications (to) from nonaccretable difference	-3,589	-3,013	8,465	-6,544
Balance at end of period	$80,531	$119,483	$80,531	$119,483

Covered_Assets_and_FDIC_Losssh5

Covered Assets and FDIC Loss-sharing Asset (Changes in Allowance for Covered Loans) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Provision for loan and lease losses	'	'	$5,019	$3,581
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Beginning balance	19,801	26,135	20,174	30,056
Loans charged off	-3,236	-5,006	-11,350	-10,031
Recoveries	1,888	2,555	5,690	4,391
Provision for loan and lease losses	-520	-947	3,419	-1,679
Ending balance	$17,933	$22,737	$17,933	$22,737

Covered_Assets_and_FDIC_Losssh6

Covered Assets and FDIC Loss-sharing Asset (Covered OREO at Carrying Value) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	'	'	$35,927	'
Proceeds from sale of OREO property	'	'	-16,527	-10,779
Gain on sale of OREO	'	'	4,955	8,745
Total OREO, end of period	21,904	'	21,904	'
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	13,051	12,854	12,093	16,311
Transfers in	614	3,559	6,121	8,089
Additional OREO write-down	-37	-199	-1,025	-293
Proceeds from sale of OREO property	-2,526	-5,408	-8,161	-19,222
Gain on sale of OREO	487	1,924	2,561	7,845
Total OREO, end of period	$11,589	$12,730	$11,589	$12,730

Covered_Assets_and_FDIC_Losssh7

Covered Assets and FDIC Loss-sharing Asset Covered Loans - Credit Quality Indicator (Details) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Net Reported Amount	$4,755,151	'	$4,444,842	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	273,021	'	341,142	'	'	'
Valuation discount on covered loans	29,177	'	43,297	'	'	'
Loans and Leases Receivable, Allowance	17,933	19,801	20,174	22,737	26,135	30,056
Loans and Leases Receivable, Net Reported Amount	225,911	'	277,671	'	'	'
Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	227,108	'	264,008	'	'	'
Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,487	'	12,118	'	'	'
Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	41,426	'	64,989	'	'	'
Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	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	52,891	'	72,870	'	'	'
Real Estate Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	182,422	'	212,521	'	'	'
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	8,417	'	21,650	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	29,291	'	34,101	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	26,320	'	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	2,971	'	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	50,484	'	69,650	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	38,130	'	48,510	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	913	'	2,849	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	11,441	'	18,291	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	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	2,407	'	3,220	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,316	'	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	91	'	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	34,934	'	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	30,711	'	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	4,223	'	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	16,159	'	18,565	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	9,913	'	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	6,246	'	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	64,844	'	70,592	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	54,117	'	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	7,507	'	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	66,485	'	81,722	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	59,746	'	67,653	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	354	'	111	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	6,385	'	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	3,809	'	9,349	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,713	'	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	1,096	'	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	1,989	'	5,432	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	750	'	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	1,239	'	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	1,685	'	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	1,458	'	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	227	'	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	934	'	1,354	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	934	'	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	'	'	'

Covered_Assets_and_FDIC_Losssh8

Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$27,981	$67,374	$39,846	$96,354
Cash received from the FDIC	541	-1,484	-1,223	-7,871
FDIC reimbursable losses, net	-214	-505	-446	522
Amortization, net	-3,992	-9,890	-16,208	-29,470
Impairment	-416	-758	2,735	-1,343
Sale of other real estate	-383	-1,479	-2,104	-5,076
Write-downs of other real estate	67	220	860	373
Other	-92	81	32	70
Balance at end of period	$23,492	$53,559	$23,492	$53,559

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Goodwill, Acquired During Period	$0	$0	$0	$228,398	'	'	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	919	919	919	919	'	'	'	'
Other intangible assets, net	21,336	27,509	21,336	27,509	'	25,852	'	'
Goodwill and Intangible Assets [Roll Forward]	'	'	'	'	'	'	'	'
Total goodwill, beginning of period	'	343,952	343,952	115,554	'	'	'	'
Total goodwill, end of period	343,952	343,952	343,952	343,952	'	'	'	'
CDI current period amortization	-1,456	-1,666	-4,516	-4,388	'	'	'	'
Total goodwill and intangible assets, end of period	365,288	371,461	365,288	371,461	'	'	'	'
Core Deposits [Member]	'	'	'	'	'	'	'	'
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Finite Lived Intangible Assets Acquired During the Period	0	0	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	47,698	32,441
Accumulated amortization at beginning of period	'	'	'	'	-25,825	-22,765	-19,441	-16,720
Core deposit intangible, net, beginning of period	21,873	28,257	24,933	15,721	'	'	'	'
CDI current period amortization	-1,456	-1,667	-4,516	-4,388	'	'	'	'
Total core deposit intangible, end of period	$20,417	$26,590	$20,417	$26,590	'	'	'	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Future Amortization Expense For Core Deposit Intangibles	'
2014	$1,447
2015	4,934
2016	4,195
2017	3,361
2018	$2,500

Derivatives_and_Balance_Sheet_2

Derivatives and Balance Sheet Offsetting (Details) (Not Designated as Hedging Instrument [Member], Interest Rate Contracts [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'
Derivative, Notional Amount	$199,700,000	$179,500,000
Other Assets [Member]	'	'
Derivative [Line Items]	'	'
Fair value of asset derivative instruments	9,472,000	9,044,000
Other Liabilities [Member]	'	'
Derivative [Line Items]	'	'
Fair value of liability derivative instruments	$9,472,000	$9,044,000

Derivatives_and_Balance_Sheet_3

Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) (USD $)	Sep. 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	9,472	9,044
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	9,472	9,044
Derivative Liability, Gross Amounts Offset in Balance Sheets	0	0
Derivative Liability	9,472	9,044
Derivative, Collateral, Right to Reclaim Securities	-9,472	-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	9,472	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	9,472	9,044
Available-for-sale Securities [Member]	'	'
Balance Sheet Offsetting [Line Items]	'	'
Securities Sold under Agreements to Repurchase, Gross	$25,000	$25,000

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)	0 Months Ended			9 Months Ended		0 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Jul. 23, 2014	Apr. 23, 2014	Jan. 23, 2014	Sep. 30, 2014	Apr. 01, 2013	Oct. 23, 2014	Apr. 01, 2013	Sep. 30, 2013
						Dividend Declared [Member]	Preferred Stock [Member]	Preferred Stock [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	'	'	'	'	'	8,782	9,000
Preferred Stock Converted Into Common Stock, Shares	'	'	'	102,363	'	'	'	'
Declared quarterly cash dividend	$0.14	$0.12	$0.12	'	'	$0.16	'	'
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	$0.14	$0.12	'	'	'	$0.14	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	$3,560	[1]	($9,210)	[1]	($12,044)	[1]	$20,149	[1]
Other comprehensive loss before reclassifications	-4,057	[1]	5,943	[1]	11,830	[1]	-23,236	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	2	[1],[2]	59	[1],[2]	-281	[1],[2]	-121	[1],[2]
Net current-period other comprehensive income (loss)	-4,055	[1]	6,002	[1]	11,549	[1]	-23,357	[1]
Ending balance	-495	[1]	-3,208	[1]	-495	[1]	-3,208	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	5,448	[1]	-7,804	[1]	-10,108	[1]	20,918	[1]
Other comprehensive loss before reclassifications	-4,057	[1]	5,943	[1]	11,830	[1]	-22,480	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	-21	[1],[2]	0	[1],[2]	-352	[1],[2]	-299	[1],[2]
Net current-period other comprehensive income (loss)	-4,078	[1]	5,943	[1]	11,478	[1]	-22,779	[1]
Ending balance	1,370	[1]	-1,861	[1]	1,370	[1]	-1,861	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'		'		'
Beginning balance	-1,888	[1]	-1,406	[1]	-1,936	[1]	-769	[1]
Other comprehensive loss before reclassifications	0	[1]	0	[1]	0	[1]	-756	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	23	[1],[2]	59	[1],[2]	71	[1],[2]	178	[1],[2]
Net current-period other comprehensive income (loss)	23	[1]	59	[1]	71	[1]	-578	[1]
Ending balance	($1,865)	[1]	($1,347)	[1]	($1,865)	[1]	($1,347)	[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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Investment securities gains, net	'	'	$552	$462
Compensation and employee benefits	32,559	33,287	94,961	90,597
Total before tax	31,188	20,010	89,698	59,126
Income tax provision	-9,605	-6,734	-27,044	-19,083
Net of tax	21,583	13,276	62,654	40,043
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	33	0	552	462
Total before tax	33	0	552	462
Income tax provision	-12	0	-200	-163
Net of tax	21	0	352	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	-36	-92	-111	-276
Total before tax	-36	-92	-111	-276
Income tax provision	13	33	40	98
Net of tax	($23)	($59)	($71)	($178)

Fair_Value_Accounting_and_Meas2

Fair Value Accounting and Measurement (Financial Assets And Liabilities Accounted for Fair Value On Recurring Basis) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	$1,611,411	$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	1,611,411	1,664,111
Other assets (Interest rate contracts)	9,472	9,044
Other liabilities (Interest rate contracts)	9,472	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	20,304	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	1,591,107	1,643,997
Other assets (Interest rate contracts)	9,472	9,044
Other liabilities (Interest rate contracts)	9,472	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	862,466	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	862,466	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	389,497	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	389,497	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	333,999	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	333,999	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	20,304	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	20,304	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	5,145	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	5,145	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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Impaired loans	$2,998	'	$2,998	'
Fair Value, Option, Changes in Fair Value, Gain (Loss)	319	1,223	402	1,332
Assets, Fair Value Disclosure	5,948	4,258	5,948	4,258
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	2,998	'	2,998	'
Assets, Fair Value Disclosure	5,948	4,258	5,948	4,258
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)	-69	'	14	'
Covered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	415	544	415	544
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	415	544	415	544
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)	37	183	37	248
Noncovered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	2,535	3,714	2,535	3,714
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	2,535	3,714	2,535	3,714
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)	$351	$1,040	$351	$1,084

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 $)

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

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]

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]

Market Approach Valuation Technique [Member]

Market Approach Valuation Technique [Member]

Impaired Loans [Member]

Impaired Loans [Member]

Impaired Loans [Member]

Minimum [Member]

Maximum [Member]

Weighted Average [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impaired loans

$2,998

$2,998

'

'

'

'

'

'

'

'

$534

$2,464

'

'

'

OREO

'

'

$2,535

$3,714

$2,535

$3,714

$415

$544

$415

$544

'

'

'

'

'

Fair Value Inputs, Comparability Adjustments

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

[1],[2]

71.00%

[1],[2]

49.00%

[1],[2]

[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 $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Interest-earning deposits with banks	$105,631	$14,531
Securities available for sale	1,611,411	1,664,111
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	157,817	165,030
Interest-earning deposits with banks	105,631	14,531
Securities available for sale	1,611,411	1,664,111
FHLB stock	31,592	32,529
Loans held for sale	949	735
Loans	4,755,151	4,444,842
FDIC loss-sharing asset	23,492	39,846
Interest rate contracts	9,472	9,044
Liabilities	'	'
Deposits	6,244,401	5,959,475
FHLB Advances	6,578	36,606
Repurchase agreements	25,000	25,000
Interest rate contracts	9,472	9,044
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	157,817	165,030
Interest-earning deposits with banks	105,631	14,531
Securities available for sale	1,611,411	1,664,111
FHLB stock	31,592	32,529
Loans held for sale	949	735
Loans	4,862,053	4,605,038
FDIC loss-sharing asset	9,385	11,248
Interest rate contracts	9,472	9,044
Liabilities	'	'
Deposits	6,242,655	5,958,747
FHLB Advances	7,105	35,080
Repurchase agreements	26,167	26,361
Interest rate contracts	9,472	9,044
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	157,817	165,030
Interest-earning deposits with banks	105,631	14,531
Securities available for sale	20,304	20,114
FHLB stock	0	0
Loans held for sale	0	0
Loans	0	0
FDIC loss-sharing asset	0	0
Interest rate contracts	0	0
Liabilities	'	'
Deposits	5,794,399	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	1,591,107	1,643,997
FHLB stock	31,592	32,529
Loans held for sale	949	735
Loans	0	0
FDIC loss-sharing asset	0	0
Interest rate contracts	9,472	9,044
Liabilities	'	'
Deposits	448,256	509,201
FHLB Advances	7,105	35,080
Repurchase agreements	26,167	26,361
Interest rate contracts	9,472	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	0
Loans	4,862,053	4,605,038
FDIC loss-sharing asset	9,385	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				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Earnings Per Share [Abstract]	'		'		'		'
Net Income	$21,583		$13,276		$62,654		$40,043
Earnings allocated to participating securities - nonvested restricted shares	216		109		598		355
Earnings allocated to participating securities - preferred shares	42		27		121		58
Earnings allocated to common shareholders, Basic	21,325		13,140		61,935		39,630
Weighted average common shares outstanding	52,112		50,834		51,772		47,032
Basic earnings per common share	$0.41		$0.26		$1.20		$0.84
Dilutive effect of equity awards and warrants	404		1,463		707		915
Earnings allocated to common shareholders, Diluted	$21,325	[1]	$13,142	[1]	$61,940	[1]	$39,635	[1]
Weighted average diluted common shares outstanding	52,516		52,297		52,479		47,947
Diluted earnings per common share	$0.41		$0.25		$1.18		$0.83
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	58		138		67		99
[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.

Branch_Sales_Details

Branch Sales (Details) (USD $)	0 Months Ended	9 Months Ended
	Aug. 23, 2014	Sep. 30, 2014	Sep. 30, 2013	Aug. 23, 2014
				location
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Disposal Date	23-Aug-14	'	'	'
Branch sales, number of branches sold in disposal group	'	'	'	3
Disposal group, branch sale, Deposits transferred	'	'	'	$22,200,000
Deposit Premium Percentage	'	'	'	2.35%
Disposal group, branch sale, loans transferred	'	'	'	1,100,000
Disposal group, branch sale, premises and equipment transferred	'	'	'	3,800,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	'	565,000	0	'
Deposits [Member]	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	565,000	'	'	'
Property, Plant and Equipment [Member]	'	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$50,000	'	'	'

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	Apr. 01, 2013	Nov. 01, 2014
In Millions, unless otherwise specified		Intermountain Community Bancorp [Domain]
		Subsequent Event [Member]
Subsequent Event [Line Items]	'	'
Business Acquisition, Effective Date of Acquisition	'	1-Nov-14
Business Combination, total merger consideration estimate	'	$134.10
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	100.00%