Columbia Banking System (COLB) 10-Q 4 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
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	'	51,269,655

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS	'		'
Cash and due from banks	$200,282		$124,573
Interest-earning deposits with banks	54,470		389,353
Total cash and cash equivalents	254,752		513,926
Securities available for sale at fair value (amortized cost of $1,572,523 and $969,359, respectively)	1,569,651		1,001,665
Federal Home Loan Bank stock at cost	32,833		21,819
Loans held for sale	840		2,563
Loans, net	4,440,048		2,864,803
FDIC loss sharing asset	53,559		96,354
Interest receivable	24,114		14,268
Premises and equipment, net	158,375		118,708
Other real estate owned ($12,730 and $16,311 covered by FDIC loss share, respectively)	36,273		26,987
Goodwill	345,231		115,554
Intangible Assets, Net (Excluding Goodwill)	27,509		15,721
Other assets	207,112		113,967
Total Assets	7,150,297		4,906,335
LIABILITIES AND SHAREHOLDERS' EQUITY	'		'
Noninterest-bearing	2,110,887		1,321,171
Interest-bearing	3,838,080		2,720,914
Total deposits	5,948,967		4,042,085
Federal Home Loan Bank advances	34,632		6,644
Securities sold under agreements to repurchase	25,000		25,000
Other liabilities	95,901		68,598
Total liabilities	6,104,500		4,142,327
Commitments and contingent liabilities	'		'
Preferred Stock, Shares Authorized	2,000		0
Preferred Stock, Shares Issued	9		0
Preferred Stock, Value, Issued	2,217		0
Shareholders' equity:	'		'
Authorized shares	63,033		63,033
Common Stock Shares Issued And Outstanding	51,271		39,686
Common Stock (no par value)	858,596		581,471
Retained earnings	188,192		162,388
Accumulated other comprehensive income	-3,208	[1]	20,149	[1]
Total shareholders' equity	1,045,797		764,008
Total Liabilities and Shareholders' Equity	7,150,297		4,906,335
Noncovered Loans [Member]	'		'
ASSETS	'		'
Loans held for sale	840		2,563
Loans, excluding covered loans, net of unearned income of ($75,293) and ($7,767), respectively	4,193,732		2,525,710
Loans and Leases Receivable, Allowance	55,844		52,244
Loans, net	4,137,888		2,473,466
Other real estate owned ($12,730 and $16,311 covered by FDIC loss share, respectively)	23,543		10,676
Covered Loans [Member]	'		'
ASSETS	'		'
Loans and Leases Receivable, Allowance	22,737		30,056
Loans, net	302,160		391,337
Other real estate owned ($12,730 and $16,311 covered by FDIC loss share, respectively)	$12,730		$16,311
[1]	All amounts are net of tax. Amounts in parenthesis indicate debits.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Securities available-for-sale, amortized cost	$1,572,523	$969,359
Less: Unearned income on loans	-75,293	-7,767
Other real estate owned covered by FDIC loss share	36,273	26,987
Common stock, par value	'	'
Common stock, shares authorized	63,033	63,033
Common stock, shares outstanding	51,271	39,686
Covered Loans [Member]	'	'
Allowance for losses on covered loans	-22,737	-30,056
Other real estate owned covered by FDIC loss share	$12,730	$16,311

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Net of tax	$13,276		$11,880	$40,043		$32,681
Unrealized gain from securities:	'		'	'		'
Net unrealized holding loss from available for sale securities arising during the period	5,943		2,631	-22,480		3,355
Reclassification adjustment of net gain from sale of available for sale securities included in income	'		'	-299		-39
Net unrealized gain from securities, net of reclassification adjustment	'		'	-22,779		3,316
Pension plan liability adjustment:	'		'	'		'
Unrecognized net actuarial gain (loss) during the period	'		'	-756		0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost	-59		-13	178		29
Pension plan liability adjustment, net	'		'	-578		29
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6,002	[1]	2,644	-23,357	[1]	3,345
Total comprehensive income	$19,278		$14,524	$16,686		$36,026
[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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income	'	'	'	'
Loans	$74,125	$52,600	$196,990	$168,875
Taxable securities	4,935	4,218	14,059	14,414
Tax-exempt securities	2,483	2,422	7,289	7,442
Federal funds sold and deposits in banks	56	229	290	564
Total interest income	81,599	59,469	218,628	191,295
Interest Expense	'	'	'	'
Deposits	929	1,339	3,072	4,679
Federal Home Loan Bank advances	135	745	-493	2,229
Prepayment charge on Federal Home Loan Bank advances	0	0	1,548	0
Other borrowings	120	120	615	358
Total interest expense	1,184	2,204	4,742	7,266
Net Interest Income	80,415	57,265	213,886	184,029
Provision for loan and lease losses	'	'	3,581	34,506
Net interest income after provision for loan and lease losses	77,102	58,382	210,305	149,523
Noninterest Income (Loss)	'	'	'	'
Service charges and other fees	13,357	7,609	34,511	22,222
Merchant services fees	2,070	2,054	5,934	6,167
Investment securities gains, net	0	0	462	62
Bank owned life insurance	904	747	2,610	2,177
Change in FDIC loss sharing asset	-11,826	-12,951	-35,446	-14,787
Other	3,117	1,630	8,017	4,650
Total noninterest income (loss)	7,622	-911	16,088	20,491
Noninterest Expense	'	'	'	'
Compensation and employee benefits	33,287	21,523	90,597	64,484
Occupancy	9,264	4,886	21,560	15,310
Merchant processing	951	921	2,660	2,724
Advertising and promotion	1,165	1,341	3,195	3,342
Data processing and communications	4,285	2,499	10,503	7,263
Legal and professional fees	2,421	2,783	9,975	6,221
Taxes, licenses and fees	1,446	1,124	4,037	3,594
Regulatory premiums	1,372	775	3,406	2,560
Net cost (benefit) of operation of other real estate owned	-777	-1,069	-6,106	-536
Amortization of intangibles	1,666	1,093	4,388	3,362
FDIC clawback liability expense (recovery)	-188	334	242	100
Other	9,822	4,726	22,810	16,689
Total noninterest expense	64,714	40,936	167,267	125,113
Income before income taxes	20,010	16,535	59,126	44,901
Income tax provision	6,734	4,655	19,083	12,220
Net Income	13,276	11,880	40,043	32,681
Earnings per common share	'	'	'	'
Basic ($ per share)	$0.26	$0.30	$0.84	$0.82
Diluted ($ per share)	$0.25	$0.30	$0.83	$0.82
Dividends paid per common share	$0.10	$0.30	$0.30	$0.89
Weighted average number of common shares outstanding	50,834	39,289	47,032	39,248
Weighted average number of diluted common shares outstanding	52,297	39,291	47,947	39,251
Noncovered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	4,260	2,875	5,260	11,125
Covered Loans [Member]	'	'	'	'
Interest Expense	'	'	'	'
Provision for loan and lease losses	($947)	($3,992)	($1,679)	$23,381

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net unrealized holding gain (loss) from available for sale securities arising during the period, tax	$3,235	$1,432	($12,238)	$1,345
Reclassification adjustment of net gain from sale of available for sale securities included in income, tax	0	0	163	23
Reclassification adjustment of net gain included in income, tax	0	0	0	0
Net unrealized gain from unfunded defined benefit plan liability arising during the period, tax	0	0	412	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost, tax	($33)	($7)	($98)	($31)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Series B Preferred Stock [Member]
In Thousands, except Share data
Balance, value at Dec. 31, 2011	$759,338	$579,136	$155,069	$25,133	$0
Balance, shares at Dec. 31, 2011	'	39,506,000	'	'	0
Net Income	32,681	'	32,681	'	'
Other comprehensive income	3,345	'	'	3,345	'
Issuance of common stock - stock option and other plans, value	713	713	'	'	'
Issuance of common stock - stock option and other plans, shares	'	40,000	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,152	1,152	'	'	'
Issuance of common stock - restricted stock awards, net of cancelled awards, shares	'	143,000	'	'	'
Cash dividends paid on common stock	-35,252	'	-35,252	'	'
Balance, value at Sep. 30, 2012	761,977	581,001	152,498	28,478	0
Balance, shares at Sep. 30, 2012	'	39,689,000	'	'	0
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 Deferred Compensation - Shares	0	'	'	'	'
Stock Adjustment Value Deferred Compensation	517	'	'	'	'
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	'	'	'
Cash dividends paid on common stock	-14,219	'	-14,219	'	'
Stock Repurchased During Period, Shares	'	-16,000	'	'	'
Stock Repurchased During Period, Value	-391	-391	'	'	'
Dividends, Preferred Stock, Cash	-20	'	'	'	'
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

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash Flows From Operating Activities	'	'
Net Income	$40,043	$32,681
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Provision for loan and lease losses and losses on covered loans	3,581	34,506
Stock-based compensation expense	1,881	1,152
Depreciation, amortization and accretion	30,216	45,873
Net realized gain on sale of securities	462	62
Net realized gain on sale of other assets	-107	-35
Net realized (gain) loss on sale of other real estate owned	-8,745	-8,604
Write-down on other real estate owned	1,929	7,001
Net change in:	'	'
Loans held for sale	1,723	-1,452
Interest receivable	-9,846	-1,300
Interest payable	-88	-374
Other assets	1,805	-5,223
Other liabilities	-2,114	-3,881
Net cash provided by operating activities	59,816	100,282
Cash Flows From Investing Activities	'	'
Loans originated and acquired, net of principal collected	166,905	72,180
Purchases of securities available for sale	-292,744	-87,346
Purchases of premises and equipment	-10,087	-12,404
Proceeds from FDIC reimbursement on loss-sharing asset	7,871	49,194
Proceeds from sales of securities available for sale	166,881	3,845
Proceeds from principal repayments and maturities of securities available for sale	241,388	163,584
Proceeds from Sales of Assets, Investing Activities	1,117	25
Proceeds from sales of covered other real estate owned	19,222	25,202
Proceeds from sales of other real estate and other personal property owned	10,779	15,069
Capital improvements on other real estate properties	0	-11
Payments to Acquire Intangible Assets	-919	0
Net cash acquired in business combinations	-154,170	0
Payments for (Proceeds from) Other Investing Activities	-522	0
Net cash provided by (used in) investing activities	-178,089	84,978
Cash Flows From Financing Activities	'	'
Net increase (decrease) in deposits	23,475	123,326
Proceeds from Federal Home Loan Bank advances	1,144,100	0
Purchase and retirement of common stock	391	0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	-20	0
Repayments of Subordinated Debt	-51,000	0
Proceeds from Federal Reserve Bank borrowings	50	0
Proceeds from exercise of stock options	1,154	713
Repayment of Federal Home Loan Bank advances	-1,244,000	-5,744
Repayment of Federal Reserve Bank borrowings	-50	0
Payment of common stock dividends	-14,219	-35,252
Net cash used by financing activities	-140,901	83,043
Increase (Decrease) in cash and cash equivalents	-259,174	268,303
Cash and cash equivalents at beginning of period	513,926	294,289
Cash and cash equivalents at end of period	254,752	562,592
Non-cash investing activities	'	'
Loans transferred to other real estate owned	17,279	15,024
Assets acquired in FDIC-assisted acquisitions (excluding cash and cash equivalents)	2,522,078	0
Stock Issued	276,181	0
Liabilities assumed in FDIC-assisted acquisitions	2,091,727	0
Cash paid for interest	4,830	7,640
Cash paid for income tax	$20,221	$9,605

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
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 the Company, and its wholly owned banking subsidiary Columbia Bank (the “Bank”), and 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, 2013 are not necessarily indicative of results to be anticipated for the year ending December 31, 2013. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the financial statements and related notes contained in the Company’s 2012 Annual Report on Form 10-K.
	Significant Accounting Policies
	The significant accounting policies used in preparation of our consolidated financial statements are disclosed in our 2012 Annual Report on Form 10-K. There have not been any changes in our significant accounting policies compared to those contained in our 2012 Form 10-K disclosure for the year ended December 31, 2012, except for the adoption of ASU 2012-06 as noted below.

Accounting_Pronouncements_Rece

Accounting Pronouncements Recently Issued	9 Months Ended
	Sep. 30, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Accounting Pronouncements Recently Issued	'
	Accounting Pronouncements Recently Issued
	In July 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The Update clarifies when it is appropriate for an unrecognized tax benefit, or a portion of an unrecognized tax benefit, to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. ASU 2013-11 is effective for interim and annual periods beginning after December 15, 2013. Early adoption is permitted. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date, however, retrospective application is also permitted. Adoption of the new guidance is not expected to have a significant impact on the Company's consolidated financial statements.
	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The Update requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component and to present either on the face of the statement where net income is presented, or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income, but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. The amendments are effective for annual and interim reporting periods beginning on or after December 15, 2012. The Company adopted the ASU 2013-02 reporting requirements during the interim reporting period beginning on January 1, 2013 with no impact to the Company's financial condition or results of operations. See Note 12 to the Consolidated Financial Statements of this report for new disclosures related to accumulated other comprehensive income.
	In October 2012, the FASB issued ASU 2012-06, Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution. ASU 2012-06 clarifies that when a reporting entity recognizes an indemnification asset as a result of a government-assisted acquisition of a financial institution and there is a subsequent change in the amount of cash flows expected to be collected on the indemnified asset, the reporting entity should subsequently measure the indemnification asset on the same basis as the underlying loans by taking into account the contractual limitations of the Loss-Sharing Agreement ("LSA"). For amortization of changes in value, the reporting entity should use the term of the indemnification agreement if it is shorter than the term of the acquired loans. ASU 2012-06 is effective for interim and annual periods beginning after December 15, 2012. The Company adopted the ASU as of January 1, 2013. As a result of the adoption of the ASU, an additional $9.9 million of indemnification asset amortization was recorded during the nine months ending September 30, 2013, resulting in a reduction of $6.4 million in net income and $0.13 in diluted earnings per share.

Business_combinations

Business combinations	9 Months Ended
	Sep. 30, 2013
Business Combinations [Abstract]	'
Business Combination Disclosure [Text Block]	'
	Business Combinations
	West Coast Bancorp
	On April 1, 2013, the Company completed its acquisition of West Coast Bancorp ("West Coast"). The Company acquired 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 strategy.
	The assets acquired and liabilities assumed have been accounted for under the acquisition method of accounting (formerly the purchase method). The assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of the April 1, 2013 acquisition date. The amounts for other assets, other liabilities and goodwill have been retrospectively adjusted during the current period to reflect the removal of a liability that was recorded by West Coast, as well as the associated impacts to the deferred tax asset (other assets) and goodwill. The adjustment recorded in the current period was a decrease to other liabilities of $1.8 million, a decrease to other assets of $622 thousand and a decrease to goodwill of $1.1 million and no impact to previously reported net income. Initial accounting for deferred taxes, the mortgage repurchase liability and payment system intangible remain incomplete as of September 30, 2013. The amounts currently recognized in the financial statements have been determined provisionally as the completion of a fair value analysis for these items is still in progress.
	The application of the acquisition method of accounting resulted in the recognition of goodwill of $229.7 million and a core deposit intangible of $15.3 million, or 0.89% of core deposits. The goodwill represents the excess purchase price over the estimated fair value of the net assets acquired. The goodwill is not deductible for income tax purposes.
	The table below summarizes the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed:
		April 1, 2013
		(in thousands)
	Purchase price as of April 1, 2013	$	540,791
	Recognized amounts of identifiable assets acquired and (liabilities assumed), at fair value:
	Cash and cash equivalents	$	110,440
	Investment securities	730,842
	Federal Home Loan Bank stock	11,824
	Acquired loans	1,407,798
	Premises and equipment	35,884
	Other real estate owned	14,708
	Core deposit intangible	15,257
	Other assets	76,088
	Deposits	(1,883,407		)
	Federal Home Loan Bank advances	(128,885		)
	Junior subordinated debentures	(51,000		)
	Other liabilities	(28,435		)
	Total fair value of identifiable net assets	311,114
	Goodwill	$	229,677
	See Note 9, Goodwill and other intangible assets, for further discussion of the accounting for goodwill and other intangible assets.
	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, 2013. Disclosure of the amount of West Coast's revenue and net income (excluding integration costs) included in Columbia's consolidated income statement is impracticable due to the integration of the operations and accounting for this acquisition.
	The following table presents certain unaudited pro forma information for illustrative purposes only, for the nine month periods ended September 30, 2013 and 2012 as if West Coast had been acquired on January 1, 2012. The unaudited estimated pro forma information combines the historical results of West Coast with the Company's consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred on January 1, 2012. 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 investments securities been recorded at fair value as of January 1, 2012. 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 will differ from the unaudited pro forma information presented.
		Unaudited Pro Forma
		Nine Months Ended September 30,
		2013			2012
		(in thousands)
	Total revenues (net interest income plus noninterest income)	$	252,392		$	322,941
	Net income	$	53,053		$	67,162
	Earnings per share - basic	$	1.04		$	1.29
	Earnings per share - diluted	$	1.01		$	1.29
	In connection with the West Coast acquisition, Columbia recognized $17.6 million of acquisition-related expenses for the nine month period ended September 30, 2013. The acquisition-related expenses were excluded from the table above.

Securities

Securities	9 Months Ended
	Sep. 30, 2013
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, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	866,128	$	12,538		$	(16,997	)	$	861,669
	State and municipal securities	344,053		13,824			(2,982		)	354,895
	U.S. government agency and government-sponsored enterprise securities	335,989		483			(8,942		)	327,530
	U.S. government securities	21,074		—			(657		)	20,417
	Other securities	5,279		27			(166		)	5,140
	Total	$	1,572,523	$	26,872		$	(29,744	)	$	1,569,651
	December 31, 2012
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	561,076	$	16,719		$	(5,426	)	$	572,369
	State and municipal securities	265,070		20,893			(388		)	285,575
	U.S. government agency and government-sponsored enterprise securities	120,085		851			(435		)	120,501
	U.S. government securities	19,804		39			(15		)	19,828
	Other securities	3,324		104			(36		)	3,392
	Total	$	969,359	$	38,606		$	(6,300	)	$	1,001,665
	The scheduled contractual maturities of investment securities available for sale at September 30, 2013 are presented as follows:
		September 30, 2013
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	23,249	$	23,493
	Due after one year through five years	278,538		278,715
	Due after five years through ten years	463,423		459,080
	Due after ten years	802,034		803,223
	Other securities with no stated maturity	5,279		5,140
	Total investment securities available-for-sale	$	1,572,523	$	1,569,651
	The following table summarizes, as of September 30, 2013, the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		Carrying Amount
		(in thousands)
	To Washington and Oregon State to secure public deposits	$	267,646
	To Federal Reserve Bank to secure borrowings	44,526
	Other securities pledged	43,325
	Total securities pledged as collateral	$	355,497
	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, 2013 and December 31, 2012:
		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, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	385,222	$	(12,567	)	$	64,044		$	(4,430	)	$	449,266	$	(16,997	)
	State and municipal securities	101,176		(2,935		)	807			(47		)	101,983		(2,982		)
	U.S. government agency and government-sponsored enterprise securities	290,257		(8,942		)	—			—			290,257		(8,942		)
	U.S. government securities	20,217		(657		)	—			—			20,217		(657		)
	Other securities	2,286		(24		)	2,813			(142		)	5,099		(166		)
	Total	$	799,158	$	(25,125	)	$	67,664		$	(4,619	)	$	866,822	$	(29,744	)
	December 31, 2012
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	167,739	$	(5,090	)	$	12,204		$	(336	)	$	179,943	$	(5,426	)
	State and municipal securities	20,413		(383		)	210			(5		)	20,623		(388		)
	U.S. government agency and government-sponsored enterprise securities	56,600		(435		)	—			—			56,600		(435		)
	U.S. government securities	9,914		(15		)	—			—			9,914		(15		)
	Other securities	—		—			964			(36		)	964		(36		)
	Total	$	254,666	$	(5,923	)	$	13,378		$	(377	)	$	268,044	$	(6,300	)
	At September 30, 2013, there were 67 U.S. government agency and government-sponsored enterprise mortgage-backed securities & collateralized mortgage obligations securities in an unrealized loss position, of which six 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, 2013.
	At September 30, 2013, there were 109 state and municipal government securities in an unrealized loss position, of which two 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, 2013, 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, 2013.
	At September 30, 2013, there were 29 U.S. government agency and government-sponsored enterprise securities in an unrealized loss position, none 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 maturity, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2013.
	At September 30, 2013, there were four U.S. government securities in an unrealized loss position, none 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 this security nor does the Company consider it more likely than not that it will be required to sell this security before the recovery of amortized cost basis, which may be maturity, the Company does not consider this investment to be other-than-temporarily impaired at September 30, 2013.
	At September 30, 2013, there were two other securities in an unrealized loss position, of which one security, a mortgage-backed securities fund, was in a continuous unrealized loss position for 12 months or more. The decline in fair value is attributable to changes in interest rates and the additional risk premium investors are demanding for investment securities with these characteristics. The Company does not consider this investment to be other-than-temporarily impaired at September 30, 2013 as it has the intent and ability to hold the investment for sufficient time to allow for recovery in the market value.

Noncovered_Loans

Noncovered Loans	9 Months Ended
	Sep. 30, 2013
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 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,
		2013				2012
	Noncovered loans:	(in thousands)
	Commercial business	$	1,569,343			$	1,155,158
	Real estate:
	One-to-four family residential	106,686				43,922
	Commercial and multifamily residential	2,048,910				1,061,201
	Total real estate	2,155,596				1,105,123
	Real estate construction:
	One-to-four family residential	53,158				50,602
	Commercial and multifamily residential	128,120				65,101
	Total real estate construction	181,278				115,703
	Consumer	362,808				157,493
	Less: Net unearned income	(75,293		)		(7,767		)
	Total noncovered loans, net of unearned income	4,193,732				2,525,710
	Less: Allowance for loan and lease losses	(55,844		)		(52,244		)
	Total noncovered loans, net	$	4,137,888			$	2,473,466
	Loans held for sale	$	840			$	2,563
	At September 30, 2013 and December 31, 2012, 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 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 $14.1 million at September 30, 2013 and $14.2 million at December 31, 2012. During the first nine months of 2013, advances on related party loans totaled $1.9 million and repayments totaled $2.0 million.
	At September 30, 2013 and December 31, 2012, $649.8 million and $443.4 million 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 $49.4 million and $13.8 million of commercial loans to the Federal Reserve Bank for additional borrowing capacity at September 30, 2013 and December 31, 2012, respectively.
	The following is an analysis of noncovered, nonaccrual loans as of September 30, 2013 and December 31, 2012:
		September 30, 2013								December 31, 2012
		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	$	11,839			$	18,194			$	9,037	$	17,821
	Unsecured	156				181				262		262
	Real estate:
	One-to-four family residential	2,220				4,058				2,349		2,672
	Commercial & multifamily residential
	Commercial land	890				1,299				4,076		7,491
	Income property	7,756				11,560				8,520		10,815
	Owner occupied	5,379				7,271				6,608		7,741
	Real estate construction:
	One-to-four family residential
	Land and acquisition	3,226				8,134				3,084		6,704
	Residential construction	459				1,941				1,816		2,431
	Consumer	4,036				6,012				1,643		1,940
	Total	$	35,961			$	58,650			$	37,395	$	57,877
	The following is an aging of the recorded investment of the noncovered loan portfolio as of September 30, 2013 and December 31, 2012:
		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, 2013	(in thousands)
	Noncovered loans:
	Commercial business
	Secured	$	1,465,682			$	6,520			$	3,306	$	1		$	9,827	$	11,839	$	1,487,348
	Unsecured	74,756				72				4		—			76		156		74,988
	Real estate:
	One-to-four family residential	99,413				2,232				224		—			2,456		2,220		104,089
	Commercial & multifamily residential
	Commercial land	133,942				—				—		—			—		890		134,832
	Income property	1,125,012				7,687				—		—			7,687		7,756		1,140,455
	Owner occupied	728,002				5,465				2,048		—			7,513		5,379		740,894
	Real estate construction:
One-to-four family residential
Land and acquisition	9,014				—				—		—			—		3,226		12,240
Residential construction	39,928				—				—		—			—		459		40,387
Commercial & multifamily residential
Income property	88,040				—				—		—			—		—		88,040
Owner occupied	39,064				—				—		—			—		—		39,064
Consumer	325,614				1,375				369		1			1,745		4,036		331,395
Total	$	4,128,467			$	23,351			$	5,951	$	2		$	29,304	$	35,961	$	4,193,732
	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, 2012	(in thousands)
Noncovered loans:
Commercial business
Secured	$	1,091,770			$	4,259			$	1,485	$	—		$	5,744	$	9,037	$	1,106,551
Unsecured	44,817				252				12		—			264		262		45,343
Real estate:
One-to-four family residential	41,508				193				142		—			335		2,349		44,192
Commercial & multifamily residential
Commercial land	42,818				311				122		—			433		4,076		47,327
Income property	603,339				2,726				227		—			2,953		8,520		614,812
Owner occupied	387,525				1,040				—		—			1,040		6,608		395,173
Real estate construction:
One-to-four family residential
Land and acquisition	15,412				—				—		—			—		3,084		18,496
Residential construction	29,848				—				—		—			—		1,816		31,664
Commercial & multifamily residential
Income property	28,342				—				—		—			—		—		28,342
Owner occupied	36,211				—				—		—			—		—		36,211
Consumer	155,207				387				362		—			749		1,643		157,599
Total	$	2,476,797			$	9,168			$	2,350	$	—		$	11,518	$	37,395	$	2,525,710
The following is an analysis of impaired loans as of September 30, 2013 and December 31, 2012:
	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, 2013	(in thousands)
Noncovered loans:
Commercial business
Secured	$	1,482,076			$	5,272			$	573	$	637		$	241	$	4,698	$	5,900
Unsecured	74,945				43				43		43			43		—		—
Real estate:
One-to-four family residential	102,547				1,542				335		358			103		1,207		2,127
Commercial & multifamily residential
Commercial land	134,266				566				—		—			—		566		899
Income property	1,131,432				9,023				—		—			—		9,023		13,319
Owner occupied	730,787				10,107				601		599			26		9,507		13,207
Real estate construction:
One-to-four family residential
Land and acquisition	9,744				2,496				115		114			73		2,381		3,149
Residential construction	40,387				—				—		—			—		—		—
Commercial & multifamily residential
Income property	88,040				—				—		—			—		—		—
Owner occupied	39,064				—				—		—			—		—		—
Consumer	331,273				122				—		—			—		122		121
Total	$	4,164,561			$	29,171			$	1,667	$	1,751		$	486	$	27,504	$	38,722
	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, 2012	(in thousands)
Noncovered loans:
Commercial business
Secured	$	1,101,689			$	4,862			$	690	$	1,994		$	113	$	4,172	$	6,769
Unsecured	45,251				92				92		92			92		—		—
Real estate:
One-to-four family residential	42,103				2,089				345		364			112		1,744		1,902
Commercial & multifamily residential
Commercial land	44,672				2,655				—		—			—		2,655		5,727
Income property	606,656				8,156				2,670		2,727			1,040		5,486		7,860
Owner occupied	383,269				11,904				608		610			38		11,296		14,642
Real estate construction:
One-to-four family residential
Land and acquisition	15,677				2,819				—		—			—		2,819		4,813
Residential construction	29,707				1,957				—		—			—		1,957		2,570
Commercial & multifamily residential
Income property	28,342				—				—		—			—		—		—
Owner occupied	36,211				—				—		—			—		—		—
Consumer	157,472				127				—		—			—		127		127
Total	$	2,491,049			$	34,661			$	4,405	$	5,787		$	1,395	$	30,256	$	44,410
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,
	2013								2012					2013				2012
	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	$	6,631			$	(25	)		$	10,306	$	6		$	5,774	$	12	$	10,008	$	14
Unsecured	47				1				118		1			68		2		118		5
Real estate:
One-to-four family residential	1,537				16				2,014		(9		)	1,677		47		2,140		—
Commercial & multifamily residential
Commercial land	1,456				48				3,079		—			2,085		48		3,242		—
Income property	10,358				22				7,577		55			9,534		168		7,830		60
Owner occupied	9,822				231				13,185		244			10,721		740		13,668		762
Real estate construction:
One-to-four family residential
Land and acquisition	2,889				1				3,213		—			2,794		4		4,876		—
Residential construction	—				—				2,792		12			526		—		3,539		17
Commercial & multifamily residential
Income property	—				—				1,877		—			—		—		3,961		—
Consumer	423				2				1,045		11			275		5		1,359		33
Total	$	33,163			$	296			$	45,206	$	320		$	33,454	$	1,026	$	50,741	$	891
There were no Troubled Debt Restructurings ("TDR") during the three months ended September 30, 2013 or nine months ended September 30, 2012. The following is an analysis of loans classified as TDR during the nine months ended September 30, 2013:
	Nine months ended September 30, 2013
	Number of TDR Modifications			Pre-Modification				Post-Modification
				Outstanding				Outstanding
				Recorded				Recorded
				Investment				Investment
Noncovered loans:	(dollars in thousands)
Commercial business:
Secured	1			$	343			$	343
Real estate:
Commercial and multifamily residential:
Commercial land	1			137				137
Income property	3			943				943
Owner occupied	1			172				172
Real estate construction:
One-to-four family residential:
Land and acquisition	1			117				117
Total	7			$	1,712			$	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 Company had commitments to lend $1.7 million and $236 thousand of additional funds on loans classified as TDR as of September 30, 2013 and December 31, 2012, respectively. 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. 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 did not have any loans modified as TDR within the past twelve months that have defaulted during the nine months ended September 30, 2013.

Allowance_for_Noncovered_Loan_

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit	9 Months Ended
	Sep. 30, 2013
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 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.
	The $4.3 million provision expense reflects a change in estimate for the allowance for loan losses for loans acquired in the West Coast Bank transaction. The change was the result of moving from the initial fair value accounting for those loans, which included a net loan discount of $88.8 million, to our standard allowance methodology. Our standard allowance methodology takes into account the $19.7 million in net loan discount accretion recorded in earnings subsequent to the acquisition. The provision resulted in a $2.8 million reduction to net income and reduced earnings per diluted common share by $0.05 and $0.06 for the current quarter and year-to-date period, respectively.
	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, 2013 and 2012. 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, 2013 and 2012:
			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
			Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
			Balance										Balance		Reserve		Allocation
	Three months ended September 30, 2012		(in thousands)
	Noncovered loans:
Commercial business
Secured		$	26,505	$	(3,744	)	$	194	$	3,007		$	25,962	$	315	$	25,647
Unsecured		772		(31		)	83		(56		)	768		100		668
Real estate:
One-to-four family residential		673		(49		)	157		(216		)	565		69		496
Commercial & multifamily residential
Commercial land		270		(55		)	—		207			422		1		421
Income property		8,726		(436		)	357		387			9,034		—		9,034
Owner occupied		9,037		(101		)	89		(694		)	8,331		245		8,086
Real estate construction:
One-to-four family residential
Land and acquisition		1,651		(307		)	404		(279		)	1,469		—		1,469
Residential construction		1,197		(18		)	—		3			1,182		—		1,182
Commercial & multifamily residential
Income property		755		—			63		(456		)	362		—		362
Owner occupied		68		—			—		23			91		—		91
Consumer		2,049		(500		)	350		267			2,166		—		2,166
Unallocated		493		—			—		682			1,175		—		1,175
Total		$	52,196	$	(5,241	)	$	1,697	$	2,875		$	51,527	$	730	$	50,797
		Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
		Balance										Balance		Reserve		Allocation
Nine months ended September 30, 2012		(in thousands)
Noncovered loans:
Commercial business
Secured		$	24,745	$	(8,126	)	$	1,184	$	8,159		$	25,962	$	315	$	25,647
Unsecured		689		(52		)	130		1			768		100		668
Real estate:
One-to-four family residential		654		(499		)	202		208			565		69		496
Commercial & multifamily residential
Commercial land		488		(437		)	—		371			422		1		421
Income property		9,551		(3,959		)	710		2,732			9,034		—		9,034
Owner occupied		9,606		(712		)	628		(1,191		)	8,331		245		8,086
Real estate construction:
One-to-four family residential
Land and acquisition		2,331		(809		)	827		(880		)	1,469		—		1,469
Residential construction		864		(617		)	79		856			1,182		—		1,182
Commercial & multifamily residential
Income property		665		(93		)	64		(274		)	362		—		362
Owner occupied		35		—			—		56			91		—		91
Consumer		2,719		(1,968		)	809		606			2,166		—		2,166
Unallocated		694		—			—		481			1,175		—		1,175
Total		$	53,041	$	(17,272	)	$	4,633	$	11,125		$	51,527	$	730	$	50,797
Changes in the allowance for unfunded commitments and letters of credit are summarized as follows:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013		2012			2013		2012
		(in thousands)
Balance at beginning of period		$	2,465	$	1,665		$	1,915	$	1,535
Net changes in the allowance for unfunded commitments and letters of credit		200		250			750		380
Balance at end of period		$	2,665	$	1,915		$	2,665	$	1,915
Risk Elements
The extension of credit in the form of loans to individuals and businesses is one of our principal commerce 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, 2013 and December 31, 2012:
		Pass		Special Mention			Substandard		Doubtful			Loss		Total
September 30, 2013		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	1,362,097	$	38,018		$	87,232	$	—		$	1	$	1,487,348
Unsecured		74,705		23			260		—			—		74,988
Real estate:
One-to-four family residential		94,947		1,687			7,455		—			—		104,089
Commercial and multifamily residential:
Commercial land		128,624		2,140			4,068		—			—		134,832
Income property		1,097,644		7,304			35,357		—			150		1,140,455
Owner occupied		721,373		1,521			18,000		—			—		740,894
Real estate construction:
One-to-four family residential:
Land and acquisition		8,003		172			4,065		—			—		12,240
Residential construction		34,950		3,980			1,457		—			—		40,387
Commercial and multifamily residential:
Income property		87,791		—			249		—			—		88,040
Owner occupied		39,064		—			—		—			—		39,064
Consumer		324,274		331			6,789		—			1		331,395
Total		$	3,973,472	$	55,176		$	164,932	$	—		$	152	4,193,732
Less:
Allowance for loan and lease losses														55,844
Noncovered loans, net														$	4,137,888
		Pass		Special Mention			Substandard		Doubtful			Loss		Total
December 31, 2012		(in thousands)
Noncovered loans:
Commercial business:
Secured		$	1,011,722	$	29,222		$	65,607	$	—		$	—	$	1,106,551
Unsecured		44,788		26			529		—			—		45,343
Real estate:
One-to-four family residential		40,346		406			3,440		—			—		44,192
Commercial and multifamily residential:
Commercial land		43,401		—			3,926		—			—		47,327
Income property		581,671		3,688			29,453		—			—		614,812
Owner occupied		357,063		1,848			36,262		—			—		395,173
Real estate construction:
One-to-four family residential:
Land and acquisition		12,741		1,351			4,404		—			—		18,496
Residential construction		28,705		1,142			1,817		—			—		31,664
Commercial and multifamily residential:
Income property		28,342		—			—		—			—		28,342
Owner occupied		36,211		—			—		—			—		36,211
Consumer		151,049		75			6,475		—			—		157,599
Total		$	2,336,039	$	37,758		$	151,913	$	—		$	—	2,525,710
Less:
Allowance for loan and lease losses														52,244
Noncovered loans, net														$	2,473,466

Changes_in_Noncovered_Other_Re

Changes in Noncovered Other Real Estate Owned	9 Months Ended
	Sep. 30, 2013
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, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	24,339		$	13,925		$	10,676		$	22,893
	Established through acquisitions	—			—			14,708			—
	Transfers in, net of write-downs ($48, $24, $90 and $24, respectively)	4,413			139			9,190			6,527
	OREO improvements	—			—			—			11
	Additional OREO write-downs	(1,066		)	(458		)	(1,636		)	(4,232		)
	Proceeds from sale of OREO property	(4,673		)	(3,170		)	(10,295		)	(15,069		)
	Gain on sale of OREO, net	530			439			900			745
	Total noncovered OREO at end of period	$	23,543		$	10,875		$	23,543		$	10,875

Covered_Assets_and_FDIC_Losssh

Covered Assets and FDIC Loss-sharing Asset	9 Months Ended
	Sep. 30, 2013
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 shall 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, 2013, the net present value of the Bank’s estimated clawback liability is $3.8 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, 2013 and December 31, 2012:
		September 30, 2013			December 31, 2012
	Covered loans:	(dollars in thousands)
	Commercial business	$	87,366		$	125,373
	Real estate:
	One-to-four family residential	44,966			57,150
	Commercial and multifamily residential	181,634			233,106
	Total real estate	226,600			290,256
	Real estate construction:
	One-to-four family residential	16,018			25,398
	Commercial and multifamily residential	7,146			15,251
	Total real estate construction	23,164			40,649
	Consumer	37,212			44,516
	Subtotal of covered loans	374,342			500,794
	Less:
	Valuation discount resulting from acquisition accounting	49,445			79,401
	Allowance for loan losses	22,737			30,056
	Covered loans, net of allowance for loan losses	$	302,160		$	391,337
	Acquired impaired loans are accounted for under ASC 310-30 and initially measured at fair value based on expected future cash flows over the life of the loans. Acquired loans that have common risk characteristics are aggregated into pools. The Company remeasures contractual and expected cash flows, at the pool-level, on a quarterly basis.
	Contractual cash flows are calculated based upon the loan pool terms after applying a prepayment factor. Calculation of the applied prepayment factor for contractual cash flows is the same as described below for expected cash flows.
	Inputs to the determination of expected cash flows include cumulative default and prepayment data as well as loss severity and recovery lag information. Cumulative default and prepayment data are calculated via a transition matrix. The transition matrix is a matrix of probability values that specifies the probability of a loan pool transitioning into a particular delinquency state (e.g. 0-30 days past due, 31 to 60 days, etc.) given its delinquency state at the remeasurement date. Loss severity factors are based upon either actual charge-off data within the loan pools or industry averages and recovery lags are based upon the collateral within the loan pools.
	Acquired impaired loans are also subject to the Company’s internal and external credit review and are risk rated using the same criteria as loans originated by the Company. However, risk ratings are not a clear indicator of losses on acquired loans as the loans were acquired with a significant discount and a majority of the losses are recoverable from the FDIC under the loss-sharing agreements.
	Losses attributable to draws on acquired loans, advanced subsequent to the loan acquisition date, are accounted for under ASC 450-20 and those amounts are also subject to the Company’s internal and external credit review. An allowance for loan losses is estimated in a similar manner as the originated loan portfolio, and a provision for loan losses is charged to earnings as necessary.
	The excess of cash flows expected to be collected over the initial fair value of acquired loans is referred to as the accretable yield and is accreted into interest income over the estimated life of the acquired loans using the effective yield method. Other adjustments to the accretable yield include changes in the estimated remaining life of the acquired loans, changes in expected cash flows and changes of indices for acquired loans with variable interest rates.
	The following table shows the changes in accretable yield for acquired loans for the three and nine months ended September 30, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Balance at beginning of period	$	140,511		$	214,061		$	166,888		$	259,669
	Accretion	(12,243		)	(19,571		)	(40,240		)	(69,045		)
	Disposals	(5,772		)	(3,146		)	(621		)	(8,218		)
	Reclassifications from nonaccretable difference	(3,013		)	(2,861		)	(6,544		)	6,077
	Balance at end of period	$	119,483		$	188,483		$	119,483		$	188,483
	During the nine months ended September 30, 2013, the Company recorded a provision recapture for losses on covered loans of $1.7 million. Of this amount, $929 thousand was impairment recapture calculated in accordance with ASC 310-30 and $750 thousand was a provision recapture to adjust the allowance for loss calculated under ASC 450-20 for draws on acquired loans. The impact to earnings of the $1.7 million of provision recapture for covered loans was partially offset through noninterest income by a $1.3 million 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, 2013 and 2012 are summarized as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Balance at beginning of period	$	26,135		$	31,784		$	30,056		$	4,944
	Loans charged off	(5,006		)	(977		)	(10,031		)	(2,574		)
	Recoveries	2,555			2,342			4,391			3,406
	Provision (recovery) for loan losses	(947		)	(3,992		)	(1,679		)	23,381
	Balance at end of period	$	22,737		$	29,157		$	22,737		$	29,157
	The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2013 and 2012:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	September 30, 2013	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	56,973		$	2,859		$	24,025		$	—		$	—	$	83,857
	Unsecured	3,018			396			95			—			—		3,509
	Real estate:
	One-to-four family residential	36,419			1,854			6,693			—			—		44,966
	Commercial and multifamily residential:
	Commercial land	11,978			205			7,796			—			—		19,979
	Income property	59,736			3,966			11,907			—			—		75,609
	Owner occupied	73,045			114			12,887			—			—		86,046
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	4,688			2,759			2,398			—			—		9,845
Residential construction	2,587			—			3,586			—			—		6,173
Commercial and multifamily residential:
Income property	3,847			—			1,936			—			—		5,783
Owner occupied	1,083			—			280			—			—		1,363
Consumer	33,421			35			3,729			27			—		37,212
Total	$	286,795		$	12,188		$	75,332		$	27		$	—	374,342
Less:
Valuation discount resulting from acquisition accounting															49,445
Allowance for loan losses															22,737
Covered loans, net															$	302,160
	Pass			Special Mention			Substandard			Doubtful			Loss		Total
December 31, 2012	(in thousands)
Covered loans:
Commercial business:
Secured	$	71,621		$	1,823		$	45,150		$	—		$	—	$	118,594
Unsecured	4,988			—			1,791			—			—		6,779
Real estate:
One-to-four family residential	44,782			1,344			11,024			—			—		57,150
Commercial and multifamily residential:
Commercial land	16,336			—			10,292			—			—		26,628
Income property	81,205			864			23,315			—			—		105,384
Owner occupied	82,222			3,318			15,554			—			—		101,094
Real estate construction:
One-to-four family residential:
Land and acquisition	4,817			3,273			5,743			—			—		13,833
Residential construction	6,050			—			5,515			—			—		11,565
Commercial and multifamily residential:
Income property	4,419			—			7,901			—			—		12,320
Owner occupied	1,107			—			1,824			—			—		2,931
Consumer	38,973			381			5,162			—			—		44,516
Total	$	356,520		$	11,003		$	133,271		$	—		$	—	500,794
Less:
Valuation discount resulting from acquisition accounting															79,401
Allowance for loan losses															30,056
Covered loans, net															$	391,337
The following table sets forth activity in covered OREO at carrying value for the three and nine months ended September 30, 2013 and 2012:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(in thousands)
Covered OREO:
Balance at beginning of period	$	12,854		$	19,079		$	16,311		$	28,126
Transfers in	3,559			3,096			8,089			8,497
Additional OREO write-downs	(199		)	(730		)	(293		)	(2,769		)
Proceeds from sale of OREO property	(5,408		)	(6,822		)	(19,222		)	(25,202		)
Net gain on sale of OREO	1,924			1,888			7,845			7,859
Total covered OREO at end of period	$	12,730		$	16,511		$	12,730		$	16,511
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, 2013, the FDIC loss-sharing asset is comprised of a $48.4 million FDIC indemnification asset and a $5.2 million FDIC receivable. The indemnification represents the cash flows the Company expects to collect from the FDIC under the loss-sharing agreements and the FDIC receivable represents the reimbursable amounts from the FDIC that have not yet been received.
For covered loans, the Company remeasures contractual and expected cash flows on a quarterly basis. When the quarterly remeasurement process results in a decrease in expected cash flows due to an increase in expected credit losses, impairment is recorded. As a result of this impairment, the indemnification asset is increased to reflect anticipated future cash to be received from the FDIC. Consistent with the loss-sharing agreements between the Company and the FDIC, the amount of the increase to the indemnification asset is measured as 80% of the resulting impairment.
Alternatively, when the quarterly remeasurement results in an increase in expected future cash flows due to a decrease in expected credit losses, the nonaccretable difference decreases and the effective yield of the related loan portfolio is increased. As a result of the improved expected cash flows, the indemnification asset would be reduced first by the amount of any impairment previously recorded and, second, by increased amortization over the remaining life of the related loss-sharing agreement.
The following table shows a detailed analysis of the FDIC loss-sharing asset for the three and nine months ended September 30, 2013 and 2012:
	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(in thousands)
Balance at beginning of period	$	67,374		$	140,003		$	96,354		$	175,071
Adjustments not reflected in income
Cash received from the FDIC	(1,484		)	(14,881		)	(7,871		)	(49,194		)
FDIC reimbursable losses, net	(505		)	(494		)	522			587
Adjustments reflected in income
Amortization, net	(9,890		)	(9,694		)	(29,470		)	(33,418		)
Loan impairment (recapture)	(758		)	(3,193		)	(1,343		)	18,705
Sale of other real estate	(1,479		)	(1,315		)	(5,076		)	(4,881		)
Write-downs of other real estate	220			1,141			373			4,503
Other	81			110			70			304
Balance at end of period	$	53,559		$	111,677		$	53,559		$	111,677

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2013
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. During the current quarter, the Company performed an impairment assessment as of July 31, 2013, and concluded that there was no impairment.
	The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of approximately 10 years.
	The following table sets forth activity for goodwill and other intangible assets for the period:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Goodwill
	Goodwill at beginning of period (1)	$	345,231		$	115,554		$	115,554		$	115,554
	Established through acquisitions	—			—			229,677			—
	Goodwill at end of period	345,231			115,554			345,231			115,554
	Other intangible assets, net
	Core deposit intangible:
	Gross core deposit intangible balance at beginning of period	47,698			32,441			32,441			32,441
	Accumulated amortization at beginning of period	(19,441		)	(14,545		)	(16,720		)	(12,275		)
	Core deposit intangible, net at beginning of period	28,257			17,896			15,721			20,166
	Established through acquisitions	—			—			15,257			—
	CDI current period amortization	(1,667		)	(1,093		)	(4,388		)	(3,363		)
	Total core deposit intangible, net at end of period	26,590			16,803			26,590			16,803
	Intangible assets not subject to amortization	919			—			919			—
	Other intangible assets, net at end of period	27,509			16,803			27,509			16,803
	Total goodwill and other intangible assets at end of period	$	372,740		$	132,357		$	372,740		$	132,357
	______________
	(1) Goodwill at beginning of period has been retrospectively adjusted for the three months ended September 30, 2013 due to adjustments to provisional amounts made related to the West Coast acquisition. See Note 3 to the Consolidated Financial Statements of this report for more information regarding this acquisition.
	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2013 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2013	$	1,657
	2014	5,963
	2015	4,934
	2016	4,195
	2017	3,361

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2013
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. 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.
	Dividends. On January 24, 2013 the Company declared a quarterly cash dividend of $0.10 per share payable on February 20, 2013 to shareholders of record at the close of business February 6, 2013. On April 24, 2013, the Company declared a quarterly cash dividend of $0.10 per common share, and common share equivalent for holders of preferred stock, payable on May 22, 2013 to shareholders of record at the close of business May 8, 2013. On July 25, 2013 the Company declared a quarterly cash dividend of $0.10 per share, and common share equivalent for holders of preferred stock, payable on August 21, 2013 to shareholders of record at the close of business August 7, 2013. Subsequent to quarter end, on October 24, 2013, the Company declared a quarterly cash dividend of $0.11 per share, and common share equivalent for holders of preferred stock, payable on November 20, 2013 to shareholders of record at the close of business November 6, 2013. 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, 2013
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, 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, 2013	(in thousands)
	Beginning balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Other comprehensive loss before reclassifications	5,943			—			5,943
	Amounts reclassified from accumulated other comprehensive income (2)	—			59			59
	Net current-period other comprehensive loss	5,943			59			6,002
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	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 (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 and nine month periods ended September 30, 2013:
		Amount Reclassified from Accumulated Other Comprehensive Income						Affected line Item in the Consolidated Statement of Income
		Three Months Ended			Nine Months Ended
		30-Sep-13			September 30, 2013
		(in thousands)
	Unrealized gains and losses on available-for-sale securities
		$	—		$	462		Investment securities gains, net
		—			462			Total before tax
		—			(163		)	Income tax provision
		$	—		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(92	)	$	(276	)	Compensation and employee benefits
		(92		)	(276		)	Total before tax
		33			98			Income tax benefit
		$	(59	)	$	(178	)	Net of tax

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities

9 Months Ended

Sep. 30, 2013

General Discussion of Derivative Instruments and Hedging Activities [Abstract]

'

Derivatives and Hedging Activities

'

Derivatives and Hedging Activities

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, 2013 and December 31, 2012 was $164.5 million and $177.0 million, respectively. There was no impact to the statement of income for the three or nine month periods ending September 30, 2013 and 2012.

The following table presents the fair value of derivatives not designated as hedging instruments at September 30, 2013 and December 31, 2012:

Asset Derivatives

Liability Derivatives

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Location

Location

(in thousands)

Interest rate contracts

Other assets

$

10,187

Other assets

$

14,921

Other liabilities

$

10,187

Other liabilities

$

14,921

Fair_Value_Accounting_and_Meas

Fair Value Accounting and Measurement	9 Months Ended
	Sep. 30, 2013
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, 2013 and December 31, 2012 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, 2013	(in thousands)
	Assets
	Securities available for sale
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	861,669	$	—		$	861,669	$	—
	State and municipal debt securities	354,895		—			354,895		—
	U.S. government agency and government-sponsored enterprise securities	327,530		—			327,530		—
	U.S. government securities	20,417		20,417			—		—
	Other securities	5,140		—			5,140		—
	Total securities available for sale	$	1,569,651	$	20,417		$	1,549,234	$	—
	Other assets (Interest rate contracts)	$	10,187	$	—		$	10,187	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	10,187	$	—		$	10,187	$	—
		Fair value		Fair Value Measurements at Reporting Date Using
				Level 1			Level 2		Level 3
	December 31, 2012	(in thousands)
	Assets
	Securities available for sale
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	572,369	$	—		$	572,369	$	—
	State and municipal debt securities	285,575		—			285,575		—
	U.S. government agency and government-sponsored enterprise securities	120,501		—			120,501		—
	U.S. government securities	19,828		19,828			—		—
	Other securities	3,392		—			3,392		—
	Total securities available for sale	$	1,001,665	$	19,828		$	981,837	$	—
	Other assets (Interest rate contracts)	$	14,921	$	—		$	14,921	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	14,921	$	—		$	14,921	$	—
	There were no transfers between Level 1 and Level 2 of the valuation hierarchy during the nine month periods ended September 30, 2013 and 2012. The Company recognizes transfers between levels of the valuation hierarchy based on the valuation level at the end of the reporting period.
	Nonrecurring Measurements
	Certain assets and liabilities are measured at fair value on a nonrecurring basis after initial recognition such as loans measured for impairment and OREO. The following methods were used to estimate the fair value of each such class of financial instrument:
	Impaired loans—A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both interest and principal) according to the contractual terms of the loan agreement. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, a loan’s observable market price, or the fair market value of the collateral less estimated costs to sell if the loan is a collateral-dependent loan. Generally, the Company utilizes the fair market value of the collateral to measure impairment. The impairment evaluations are performed in conjunction with the ALLL process on a quarterly basis by officers in the Special Credits group, which reports to the Chief Credit Officer. The Real Estate Appraisal Services Department ("REASD"), which also reports to the Chief Credit Officer, is responsible for obtaining appraisals from third-parties or performing internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
	Other real estate owned and other personal property owned ("OPPO")—OREO and OPPO are real and personal property that the Bank has taken ownership of in partial or full satisfaction of a loan or loans. OREO and OPPO are generally measured based on the item's fair market value as indicated by an appraisal or a letter of intent to purchase. OREO and OPPO are recorded at the lower of carrying amount or fair value less estimated costs to sell. This amount becomes the property’s new basis. Any write-downs based on the property fair value less estimated costs to sell at the date of acquisition are charged to the allowance for loan and lease losses. Management periodically reviews OREO and OPPO in an effort to ensure the property is carried at the lower of its new basis or fair value, net of estimated costs to sell. Any write-downs subsequent to acquisition are charged to earnings. The initial and subsequent write-down evaluations are performed by officers in the Special Credits group, which reports to the Chief Credit Officer. The REASD obtains appraisals from third-parties for OREO and OPPO and performs internal evaluations. If an appraisal is obtained from a third-party, the REASD reviews the appraisal to evaluate the adequacy of the appraisal report, including its scope, methods, accuracy, and reasonableness.
	The following tables set forth the Company's assets that were measured using fair value estimates on a nonrecurring basis at September 30, 2013 and 2012.
		Fair value at September 30, 2013		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended			Losses During the Nine Months Ended
				Level 1			Level 2		Level 3		September 30, 2013			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 at		Fair Value Measurements at Reporting Date Using							Gains (Losses) During the Three Months Ended			Losses During the Nine Months Ended
		September 30, 2012		Level 1			Level 2		Level 3		30-Sep-12			30-Sep-12
		(in thousands)
	Impaired loans	$	6,094	$	—		$	—	$	6,094	$	509		$	(3,377	)
	Noncovered OREO	1,807		—			—		1,807		(458		)	(3,117		)
	Covered OREO	1,021		—			—		1,021		(481		)	(1,025		)
	Noncovered OPPO	—		—			—		—		—			(1,990		)
		$	8,922	$	—		$	—	$	8,922	$	(430	)	$	(9,509	)
	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, 2013		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(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 and inventory).
(2) Quantitative disclosures are not provided for noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
	Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
	September 30, 2012
	(dollars in thousands)
Impaired loans - real estate collateral	$	4,148	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Impaired loans - other collateral (3)	1,946		Fair Market Value of Collateral		Adjustment to Stated value	0% - 70% (27%)
Noncovered OREO	1,807		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Covered OREO	1,021		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
Noncovered OPPO	—		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 and inventory).
(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate, noncovered OREO, covered OREO and noncovered OPPO because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of accounts receivable and inventory
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, 2013 or December 31, 2012, 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, 2013 (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 as their basis, readily observable market parameters (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, 2013 and December 31, 2012:
	September 30, 2013
	Carrying		Fair			Level 1		Level 2		Level 3
	Amount		Value
	(in thousands)
Assets
Cash and due from banks	$	200,282	$	200,282		$	200,282	$	—	$	—
Interest-earning deposits with banks	54,470		54,470			54,470		—		—
Securities available for sale	1,569,651		1,569,651			20,417		1,549,234		—
FHLB stock	32,833		32,833			—		32,833		—
Loans held for sale	840		840			—		840		—
Loans	4,440,048		4,397,456			—		—		4,397,456
FDIC loss-sharing asset	53,559		17,353			—		—		17,353
Interest rate contracts	10,187		10,187			—		10,187		—
Liabilities
Deposits	$	5,948,967	$	5,948,473		$	5,413,557	$	534,916	$	—
FHLB Advances	34,632		33,301			—		33,301		—
Repurchase agreements	25,000		26,207			—		26,207		—
Interest rate contracts	10,187		10,187			—		10,187		—
	December 31, 2012
	Carrying		Fair			Level 1		Level 2		Level 3
	Amount		Value
	(in thousands)
Assets
Cash and due from banks	$	124,573	$	124,573		$	124,573	$	—	$	—
Interest-earning deposits with banks	389,353		389,353			389,353		—		—
Securities available for sale	1,001,665		1,001,665			19,828		981,837		—
FHLB stock	21,819		21,819			—		21,819		—
Loans held for sale	2,563		2,563			—		2,563		—
Loans	2,864,803		2,944,317			—		—		2,944,317
FDIC loss-sharing asset	96,354		26,543			—		—		26,543
Interest rate contracts	14,921		14,921			—		14,921		—
Liabilities
Deposits	$	4,042,085	$	4,043,221		$	3,549,821	$	493,400	$	—
FHLB Advances	6,644		5,894			—		5,894		—
Repurchase agreements	25,000		26,464			—		26,464		—
Interest rate contracts	14,921		14,921			—		14,921		—

Earnings_per_Common_Share

Earnings per Common Share	9 Months Ended
	Sep. 30, 2013
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 grants restricted shares under share-based compensation plans that qualify as participating securities. Additionally, the Company issued preferred shares in the West Coast acquisition that also 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, 2013 and 2012:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands except per share)
	Basic EPS:
	Net income	$	13,276	$	11,880	$	40,043	$	32,681
	Less: Earnings allocated to participating securities
	Preferred shares	27		—		58		—
	Nonvested restricted shares	109		113		355		336
	Earnings allocated to common shareholders	$	13,140	$	11,767	$	39,630	$	32,345
	Weighted average common shares outstanding	50,834		39,289		47,032		39,248
	Basic earnings per common share	$	0.26	$	0.3	$	0.84	$	0.82
	Diluted EPS:
	Earnings allocated to common shareholders	$	13,142	$	11,767	$	39,635	$	32,345
	Weighted average common shares outstanding	50,834		39,289		47,032		39,248
	Dilutive effect of equity awards	1,463		2		915		3
	Weighted average diluted common shares outstanding	52,297		39,291		47,947		39,251
	Diluted earnings per common share	$	0.25	$	0.3	$	0.83	$	0.82
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive	138		53		99		46

Accounting_Pronouncements_Rece1

Accounting Pronouncements Recently Issued Adoption of new accounting guidance, impacts (Tables)	9 Months Ended
	Sep. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	'
	As a result of the adoption of the ASU, an additional $9.9 million of indemnification asset amortization was recorded during the nine months ending September 30, 2013, resulting in a reduction of $6.4 million in net income and $0.13 in diluted earnings per share.

Securities_Tables

Securities (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	866,128	$	12,538		$	(16,997	)	$	861,669
	State and municipal securities	344,053		13,824			(2,982		)	354,895
	U.S. government agency and government-sponsored enterprise securities	335,989		483			(8,942		)	327,530
	U.S. government securities	21,074		—			(657		)	20,417
	Other securities	5,279		27			(166		)	5,140
	Total	$	1,572,523	$	26,872		$	(29,744	)	$	1,569,651
	December 31, 2012
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	561,076	$	16,719		$	(5,426	)	$	572,369
	State and municipal securities	265,070		20,893			(388		)	285,575
	U.S. government agency and government-sponsored enterprise securities	120,085		851			(435		)	120,501
	U.S. government securities	19,804		39			(15		)	19,828
	Other securities	3,324		104			(36		)	3,392
	Total	$	969,359	$	38,606		$	(6,300	)	$	1,001,665
Schedule of Contractual Maturities of Investment Securities Available for Sale	'
	The scheduled contractual maturities of investment securities available for sale at September 30, 2013 are presented as follows:
		September 30, 2013
		Amortized Cost		Fair Value
		(in thousands)
	Due within one year	$	23,249	$	23,493
	Due after one year through five years	278,538		278,715
	Due after five years through ten years	463,423		459,080
	Due after ten years	802,034		803,223
	Other securities with no stated maturity	5,279		5,140
	Total investment securities available-for-sale	$	1,572,523	$	1,569,651
Carrying Value of Securities Pledged As Collateral	'
	The following table summarizes, as of September 30, 2013, the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law:
		Carrying Amount
		(in thousands)
	To Washington and Oregon State to secure public deposits	$	267,646
	To Federal Reserve Bank to secure borrowings	44,526
	Other securities pledged	43,325
	Total securities pledged as collateral	$	355,497
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, 2013 and December 31, 2012:
		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, 2013
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	385,222	$	(12,567	)	$	64,044		$	(4,430	)	$	449,266	$	(16,997	)
	State and municipal securities	101,176		(2,935		)	807			(47		)	101,983		(2,982		)
	U.S. government agency and government-sponsored enterprise securities	290,257		(8,942		)	—			—			290,257		(8,942		)
	U.S. government securities	20,217		(657		)	—			—			20,217		(657		)
	Other securities	2,286		(24		)	2,813			(142		)	5,099		(166		)
	Total	$	799,158	$	(25,125	)	$	67,664		$	(4,619	)	$	866,822	$	(29,744	)
	December 31, 2012
	U.S. government agency and government-sponsored enterprise mortgage-backed securities and collateralized mortgage obligations	$	167,739	$	(5,090	)	$	12,204		$	(336	)	$	179,943	$	(5,426	)
	State and municipal securities	20,413		(383		)	210			(5		)	20,623		(388		)
	U.S. government agency and government-sponsored enterprise securities	56,600		(435		)	—			—			56,600		(435		)
	U.S. government securities	9,914		(15		)	—			—			9,914		(15		)
	Other securities	—		—			964			(36		)	964		(36		)
	Total	$	254,666	$	(5,923	)	$	13,378		$	(377	)	$	268,044	$	(6,300	)

Noncovered_Loans_Tables

Noncovered Loans (Tables) (Noncovered Loans [Member])	9 Months Ended
	Sep. 30, 2013
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,
		2013				2012
	Noncovered loans:	(in thousands)
	Commercial business	$	1,569,343			$	1,155,158
	Real estate:
	One-to-four family residential	106,686				43,922
	Commercial and multifamily residential	2,048,910				1,061,201
	Total real estate	2,155,596				1,105,123
	Real estate construction:
	One-to-four family residential	53,158				50,602
	Commercial and multifamily residential	128,120				65,101
	Total real estate construction	181,278				115,703
	Consumer	362,808				157,493
	Less: Net unearned income	(75,293		)		(7,767		)
	Total noncovered loans, net of unearned income	4,193,732				2,525,710
	Less: Allowance for loan and lease losses	(55,844		)		(52,244		)
	Total noncovered loans, net	$	4,137,888			$	2,473,466
	Loans held for sale	$	840			$	2,563
Analysis of nonaccrual loans	'
	The following is an analysis of noncovered, nonaccrual loans as of September 30, 2013 and December 31, 2012:
		September 30, 2013								December 31, 2012
		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	$	11,839			$	18,194			$	9,037	$	17,821
	Unsecured	156				181				262		262
	Real estate:
	One-to-four family residential	2,220				4,058				2,349		2,672
	Commercial & multifamily residential
	Commercial land	890				1,299				4,076		7,491
	Income property	7,756				11,560				8,520		10,815
	Owner occupied	5,379				7,271				6,608		7,741
	Real estate construction:
	One-to-four family residential
	Land and acquisition	3,226				8,134				3,084		6,704
	Residential construction	459				1,941				1,816		2,431
	Consumer	4,036				6,012				1,643		1,940
	Total	$	35,961			$	58,650			$	37,395	$	57,877
Past Due Financing Receivables	'
	The following is an aging of the recorded investment of the noncovered loan portfolio as of September 30, 2013 and December 31, 2012:
		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, 2013	(in thousands)
	Noncovered loans:
	Commercial business
	Secured	$	1,465,682			$	6,520			$	3,306	$	1		$	9,827	$	11,839	$	1,487,348
	Unsecured	74,756				72				4		—			76		156		74,988
	Real estate:
	One-to-four family residential	99,413				2,232				224		—			2,456		2,220		104,089
	Commercial & multifamily residential
	Commercial land	133,942				—				—		—			—		890		134,832
	Income property	1,125,012				7,687				—		—			7,687		7,756		1,140,455
	Owner occupied	728,002				5,465				2,048		—			7,513		5,379		740,894
	Real estate construction:
	One-to-four family residential
	Land and acquisition	9,014				—				—		—			—		3,226		12,240
	Residential construction	39,928				—				—		—			—		459		40,387
	Commercial & multifamily residential
	Income property	88,040				—				—		—			—		—		88,040
	Owner occupied	39,064				—				—		—			—		—		39,064
	Consumer	325,614				1,375				369		1			1,745		4,036		331,395
	Total	$	4,128,467			$	23,351			$	5,951	$	2		$	29,304	$	35,961	$	4,193,732
		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, 2012	(in thousands)
	Noncovered loans:
	Commercial business
	Secured	$	1,091,770			$	4,259			$	1,485	$	—		$	5,744	$	9,037	$	1,106,551
	Unsecured	44,817				252				12		—			264		262		45,343
	Real estate:
	One-to-four family residential	41,508				193				142		—			335		2,349		44,192
	Commercial & multifamily residential
	Commercial land	42,818				311				122		—			433		4,076		47,327
	Income property	603,339				2,726				227		—			2,953		8,520		614,812
	Owner occupied	387,525				1,040				—		—			1,040		6,608		395,173
	Real estate construction:
	One-to-four family residential
	Land and acquisition	15,412				—				—		—			—		3,084		18,496
	Residential construction	29,848				—				—		—			—		1,816		31,664
	Commercial & multifamily residential
	Income property	28,342				—				—		—			—		—		28,342
	Owner occupied	36,211				—				—		—			—		—		36,211
	Consumer	155,207				387				362		—			749		1,643		157,599
	Total	$	2,476,797			$	9,168			$	2,350	$	—		$	11,518	$	37,395	$	2,525,710
Impaired Financing Receivables	'
	The following is an analysis of impaired loans as of September 30, 2013 and December 31, 2012:
		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, 2013	(in thousands)
	Noncovered loans:
	Commercial business
	Secured	$	1,482,076			$	5,272			$	573	$	637		$	241	$	4,698	$	5,900
	Unsecured	74,945				43				43		43			43		—		—
	Real estate:
	One-to-four family residential	102,547				1,542				335		358			103		1,207		2,127
	Commercial & multifamily residential
	Commercial land	134,266				566				—		—			—		566		899
	Income property	1,131,432				9,023				—		—			—		9,023		13,319
	Owner occupied	730,787				10,107				601		599			26		9,507		13,207
	Real estate construction:
	One-to-four family residential
	Land and acquisition	9,744				2,496				115		114			73		2,381		3,149
	Residential construction	40,387				—				—		—			—		—		—
	Commercial & multifamily residential
	Income property	88,040				—				—		—			—		—		—
	Owner occupied	39,064				—				—		—			—		—		—
	Consumer	331,273				122				—		—			—		122		121
	Total	$	4,164,561			$	29,171			$	1,667	$	1,751		$	486	$	27,504	$	38,722
		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, 2012	(in thousands)
	Noncovered loans:
	Commercial business
	Secured	$	1,101,689			$	4,862			$	690	$	1,994		$	113	$	4,172	$	6,769
	Unsecured	45,251				92				92		92			92		—		—
	Real estate:
	One-to-four family residential	42,103				2,089				345		364			112		1,744		1,902
	Commercial & multifamily residential
	Commercial land	44,672				2,655				—		—			—		2,655		5,727
	Income property	606,656				8,156				2,670		2,727			1,040		5,486		7,860
	Owner occupied	383,269				11,904				608		610			38		11,296		14,642
	Real estate construction:
	One-to-four family residential
	Land and acquisition	15,677				2,819				—		—			—		2,819		4,813
	Residential construction	29,707				1,957				—		—			—		1,957		2,570
	Commercial & multifamily residential
	Income property	28,342				—				—		—			—		—		—
	Owner occupied	36,211				—				—		—			—		—		—
	Consumer	157,472				127				—		—			—		127		127
	Total	$	2,491,049			$	34,661			$	4,405	$	5,787		$	1,395	$	30,256	$	44,410
	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,
		2013								2012					2013				2012
		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	$	6,631			$	(25	)		$	10,306	$	6		$	5,774	$	12	$	10,008	$	14
Unsecured	47				1				118		1			68		2		118		5
Real estate:
One-to-four family residential	1,537				16				2,014		(9		)	1,677		47		2,140		—
Commercial & multifamily residential
Commercial land	1,456				48				3,079		—			2,085		48		3,242		—
Income property	10,358				22				7,577		55			9,534		168		7,830		60
Owner occupied	9,822				231				13,185		244			10,721		740		13,668		762
Real estate construction:
One-to-four family residential
Land and acquisition	2,889				1				3,213		—			2,794		4		4,876		—
Residential construction	—				—				2,792		12			526		—		3,539		17
Commercial & multifamily residential
Income property	—				—				1,877		—			—		—		3,961		—
Consumer	423				2				1,045		11			275		5		1,359		33
Total	$	33,163			$	296			$	45,206	$	320		$	33,454	$	1,026	$	50,741	$	891
Analysis of loans classified as Troubled Debt Restructurings (bTDRb)	'
	There were no Troubled Debt Restructurings ("TDR") during the three months ended September 30, 2013 or nine months ended September 30, 2012. The following is an analysis of loans classified as TDR during the nine months ended September 30, 2013:
		Nine months ended September 30, 2013
		Number of TDR Modifications			Pre-Modification				Post-Modification
					Outstanding				Outstanding
					Recorded				Recorded
					Investment				Investment
	Noncovered loans:	(dollars in thousands)
	Commercial business:
	Secured	1			$	343			$	343
	Real estate:
	Commercial and multifamily residential:
	Commercial land	1			137				137
	Income property	3			943				943
	Owner occupied	1			172				172
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	1			117				117
	Total	7			$	1,712			$	1,712

Allowance_for_Noncovered_Loan_1

Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Tables)	3 Months Ended									9 Months Ended
	Sep. 30, 2012									Sep. 30, 2013
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 are summarized as follows:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands)
	Balance at beginning of period	$	2,465	$	1,665	$	1,915	$	1,535
	Net changes in the allowance for unfunded commitments and letters of credit	200		250		750		380
	Balance at end of period	$	2,665	$	1,915	$	2,665	$	1,915
Financing Receivable Credit Quality Indicators	'									'
										The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2013 and 2012:
											Pass		Special Mention			Substandard		Doubtful			Loss		Total
										September 30, 2013	(in thousands)
										Covered loans:
										Commercial business:
										Secured	$	56,973	$	2,859		$	24,025	$	—		$	—	$	83,857
										Unsecured	3,018		396			95		—			—		3,509
										Real estate:
										One-to-four family residential	36,419		1,854			6,693		—			—		44,966
										Commercial and multifamily residential:
										Commercial land	11,978		205			7,796		—			—		19,979
										Income property	59,736		3,966			11,907		—			—		75,609
										Owner occupied	73,045		114			12,887		—			—		86,046
										Real estate construction:
										One-to-four family residential:
										Land and acquisition	4,688		2,759			2,398		—			—		9,845
										Residential construction	2,587		—			3,586		—			—		6,173
										Commercial and multifamily residential:
										Income property	3,847		—			1,936		—			—		5,783
										Owner occupied	1,083		—			280		—			—		1,363
										Consumer	33,421		35			3,729		27			—		37,212
										Total	$	286,795	$	12,188		$	75,332	$	27		$	—	374,342
										Less:
										Valuation discount resulting from acquisition accounting													49,445
										Allowance for loan losses													22,737
										Covered loans, net													$	302,160
											Pass		Special Mention			Substandard		Doubtful			Loss		Total
										December 31, 2012	(in thousands)
										Covered loans:
										Commercial business:
										Secured	$	71,621	$	1,823		$	45,150	$	—		$	—	$	118,594
										Unsecured	4,988		—			1,791		—			—		6,779
										Real estate:
										One-to-four family residential	44,782		1,344			11,024		—			—		57,150
										Commercial and multifamily residential:
										Commercial land	16,336		—			10,292		—			—		26,628
										Income property	81,205		864			23,315		—			—		105,384
										Owner occupied	82,222		3,318			15,554		—			—		101,094
										Real estate construction:
										One-to-four family residential:
										Land and acquisition	4,817		3,273			5,743		—			—		13,833
										Residential construction	6,050		—			5,515		—			—		11,565
										Commercial and multifamily residential:
										Income property	4,419		—			7,901		—			—		12,320
										Owner occupied	1,107		—			1,824		—			—		2,931
										Consumer	38,973		381			5,162		—			—		44,516
										Total	$	356,520	$	11,003		$	133,271	$	—		$	—	500,794
										Less:
										Valuation discount resulting from acquisition accounting													79,401
										Allowance for loan losses													30,056
										Covered loans, net													$	391,337
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, 2013 and 2012:
											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
											Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
											Balance										Balance		Reserve		Allocation
										Three months ended September 30, 2012	(in thousands)
										Noncovered loans:
										Commercial business
										Secured	$	26,505	$	(3,744	)	$	194	$	3,007		$	25,962	$	315	$	25,647
										Unsecured	772		(31		)	83		(56		)	768		100		668
										Real estate:
										One-to-four family residential	673		(49		)	157		(216		)	565		69		496
										Commercial & multifamily residential
										Commercial land	270		(55		)	—		207			422		1		421
										Income property	8,726		(436		)	357		387			9,034		—		9,034
										Owner occupied	9,037		(101		)	89		(694		)	8,331		245		8,086
										Real estate construction:
										One-to-four family residential
										Land and acquisition	1,651		(307		)	404		(279		)	1,469		—		1,469
Residential construction	1,197		(18		)	—		3			1,182		—		1,182
Commercial & multifamily residential
Income property	755		—			63		(456		)	362		—		362
Owner occupied	68		—			—		23			91		—		91
Consumer	2,049		(500		)	350		267			2,166		—		2,166
Unallocated	493		—			—		682			1,175		—		1,175
Total	$	52,196	$	(5,241	)	$	1,697	$	2,875		$	51,527	$	730	$	50,797
	Beginning		Charge-offs			Recoveries		Provision (Recovery)			Ending		Specific		General
	Balance										Balance		Reserve		Allocation
Nine months ended September 30, 2012	(in thousands)
Noncovered loans:
Commercial business
Secured	$	24,745	$	(8,126	)	$	1,184	$	8,159		$	25,962	$	315	$	25,647
Unsecured	689		(52		)	130		1			768		100		668
Real estate:
One-to-four family residential	654		(499		)	202		208			565		69		496
Commercial & multifamily residential
Commercial land	488		(437		)	—		371			422		1		421
Income property	9,551		(3,959		)	710		2,732			9,034		—		9,034
Owner occupied	9,606		(712		)	628		(1,191		)	8,331		245		8,086
Real estate construction:
One-to-four family residential
Land and acquisition	2,331		(809		)	827		(880		)	1,469		—		1,469
Residential construction	864		(617		)	79		856			1,182		—		1,182
Commercial & multifamily residential
Income property	665		(93		)	64		(274		)	362		—		362
Owner occupied	35		—			—		56			91		—		91
Consumer	2,719		(1,968		)	809		606			2,166		—		2,166
Unallocated	694		—			—		481			1,175		—		1,175
Total	$	53,041	$	(17,272	)	$	4,633	$	11,125		$	51,527	$	730	$	50,797
Financing Receivable Credit Quality Indicators	'									'
										The following is an analysis of the credit quality of our noncovered loan portfolio as of September 30, 2013 and December 31, 2012:
											Pass		Special Mention			Substandard		Doubtful			Loss		Total
										September 30, 2013	(in thousands)
										Noncovered loans:
										Commercial business:
										Secured	$	1,362,097	$	38,018		$	87,232	$	—		$	1	$	1,487,348
										Unsecured	74,705		23			260		—			—		74,988
										Real estate:
										One-to-four family residential	94,947		1,687			7,455		—			—		104,089
										Commercial and multifamily residential:
										Commercial land	128,624		2,140			4,068		—			—		134,832
										Income property	1,097,644		7,304			35,357		—			150		1,140,455
										Owner occupied	721,373		1,521			18,000		—			—		740,894
										Real estate construction:
										One-to-four family residential:
										Land and acquisition	8,003		172			4,065		—			—		12,240
										Residential construction	34,950		3,980			1,457		—			—		40,387
										Commercial and multifamily residential:
										Income property	87,791		—			249		—			—		88,040
										Owner occupied	39,064		—			—		—			—		39,064
										Consumer	324,274		331			6,789		—			1		331,395
										Total	$	3,973,472	$	55,176		$	164,932	$	—		$	152	4,193,732
										Less:
										Allowance for loan and lease losses													55,844
										Noncovered loans, net													$	4,137,888
											Pass		Special Mention			Substandard		Doubtful			Loss		Total
										December 31, 2012	(in thousands)
										Noncovered loans:
										Commercial business:
										Secured	$	1,011,722	$	29,222		$	65,607	$	—		$	—	$	1,106,551
										Unsecured	44,788		26			529		—			—		45,343
										Real estate:
										One-to-four family residential	40,346		406			3,440		—			—		44,192
										Commercial and multifamily residential:
										Commercial land	43,401		—			3,926		—			—		47,327
										Income property	581,671		3,688			29,453		—			—		614,812
										Owner occupied	357,063		1,848			36,262		—			—		395,173
										Real estate construction:
										One-to-four family residential:
										Land and acquisition	12,741		1,351			4,404		—			—		18,496
										Residential construction	28,705		1,142			1,817		—			—		31,664
										Commercial and multifamily residential:
										Income property	28,342		—			—		—			—		28,342
										Owner occupied	36,211		—			—		—			—		36,211
										Consumer	151,049		75			6,475		—			—		157,599
										Total	$	2,336,039	$	37,758		$	151,913	$	—		$	—	2,525,710
										Less:
										Allowance for loan and lease losses													52,244
										Noncovered loans, net													$	2,473,466

Changes_in_Noncovered_Other_Re1

Changes in Noncovered Other Real Estate Owned (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Noncovered OREO:
	Balance at beginning of period	$	24,339		$	13,925		$	10,676		$	22,893
	Established through acquisitions	—			—			14,708			—
	Transfers in, net of write-downs ($48, $24, $90 and $24, respectively)	4,413			139			9,190			6,527
	OREO improvements	—			—			—			11
	Additional OREO write-downs	(1,066		)	(458		)	(1,636		)	(4,232		)
	Proceeds from sale of OREO property	(4,673		)	(3,170		)	(10,295		)	(15,069		)
	Gain on sale of OREO, net	530			439			900			745
	Total noncovered OREO at end of period	$	23,543		$	10,875		$	23,543		$	10,875

Covered_Assets_and_FDIC_Losssh1

Covered Assets and FDIC Loss-sharing Asset (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013 and December 31, 2012:
		September 30, 2013			December 31, 2012
	Covered loans:	(dollars in thousands)
	Commercial business	$	87,366		$	125,373
	Real estate:
	One-to-four family residential	44,966			57,150
	Commercial and multifamily residential	181,634			233,106
	Total real estate	226,600			290,256
	Real estate construction:
	One-to-four family residential	16,018			25,398
	Commercial and multifamily residential	7,146			15,251
	Total real estate construction	23,164			40,649
	Consumer	37,212			44,516
	Subtotal of covered loans	374,342			500,794
	Less:
	Valuation discount resulting from acquisition accounting	49,445			79,401
	Allowance for loan losses	22,737			30,056
	Covered loans, net of allowance for loan losses	$	302,160		$	391,337
Changes in Accretable Yield for Acquired Loans	'
	The following table shows the changes in accretable yield for acquired loans for the three and nine months ended September 30, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Balance at beginning of period	$	140,511		$	214,061		$	166,888		$	259,669
	Accretion	(12,243		)	(19,571		)	(40,240		)	(69,045		)
	Disposals	(5,772		)	(3,146		)	(621		)	(8,218		)
	Reclassifications from nonaccretable difference	(3,013		)	(2,861		)	(6,544		)	6,077
	Balance at end of period	$	119,483		$	188,483		$	119,483		$	188,483
Financing Receivable Credit Quality Indicators	'
	The following is an analysis of the credit quality of our covered loan portfolio as of September 30, 2013 and 2012:
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	September 30, 2013	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	56,973		$	2,859		$	24,025		$	—		$	—	$	83,857
	Unsecured	3,018			396			95			—			—		3,509
	Real estate:
	One-to-four family residential	36,419			1,854			6,693			—			—		44,966
	Commercial and multifamily residential:
	Commercial land	11,978			205			7,796			—			—		19,979
	Income property	59,736			3,966			11,907			—			—		75,609
	Owner occupied	73,045			114			12,887			—			—		86,046
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	4,688			2,759			2,398			—			—		9,845
	Residential construction	2,587			—			3,586			—			—		6,173
	Commercial and multifamily residential:
	Income property	3,847			—			1,936			—			—		5,783
	Owner occupied	1,083			—			280			—			—		1,363
	Consumer	33,421			35			3,729			27			—		37,212
	Total	$	286,795		$	12,188		$	75,332		$	27		$	—	374,342
	Less:
	Valuation discount resulting from acquisition accounting															49,445
	Allowance for loan losses															22,737
	Covered loans, net															$	302,160
		Pass			Special Mention			Substandard			Doubtful			Loss		Total
	December 31, 2012	(in thousands)
	Covered loans:
	Commercial business:
	Secured	$	71,621		$	1,823		$	45,150		$	—		$	—	$	118,594
	Unsecured	4,988			—			1,791			—			—		6,779
	Real estate:
	One-to-four family residential	44,782			1,344			11,024			—			—		57,150
	Commercial and multifamily residential:
	Commercial land	16,336			—			10,292			—			—		26,628
	Income property	81,205			864			23,315			—			—		105,384
	Owner occupied	82,222			3,318			15,554			—			—		101,094
	Real estate construction:
	One-to-four family residential:
	Land and acquisition	4,817			3,273			5,743			—			—		13,833
	Residential construction	6,050			—			5,515			—			—		11,565
	Commercial and multifamily residential:
	Income property	4,419			—			7,901			—			—		12,320
	Owner occupied	1,107			—			1,824			—			—		2,931
	Consumer	38,973			381			5,162			—			—		44,516
	Total	$	356,520		$	11,003		$	133,271		$	—		$	—	500,794
	Less:
	Valuation discount resulting from acquisition accounting															79,401
	Allowance for loan losses															30,056
	Covered loans, net															$	391,337
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, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Covered OREO:
	Balance at beginning of period	$	12,854		$	19,079		$	16,311		$	28,126
	Transfers in	3,559			3,096			8,089			8,497
	Additional OREO write-downs	(199		)	(730		)	(293		)	(2,769		)
	Proceeds from sale of OREO property	(5,408		)	(6,822		)	(19,222		)	(25,202		)
	Net gain on sale of OREO	1,924			1,888			7,845			7,859
	Total covered OREO at end of period	$	12,730		$	16,511		$	12,730		$	16,511
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, 2013 and 2012:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Balance at beginning of period	$	67,374		$	140,003		$	96,354		$	175,071
	Adjustments not reflected in income
	Cash received from the FDIC	(1,484		)	(14,881		)	(7,871		)	(49,194		)
	FDIC reimbursable losses, net	(505		)	(494		)	522			587
	Adjustments reflected in income
	Amortization, net	(9,890		)	(9,694		)	(29,470		)	(33,418		)
	Loan impairment (recapture)	(758		)	(3,193		)	(1,343		)	18,705
	Sale of other real estate	(1,479		)	(1,315		)	(5,076		)	(4,881		)
	Write-downs of other real estate	220			1,141			373			4,503
	Other	81			110			70			304
	Balance at end of period	$	53,559		$	111,677		$	53,559		$	111,677
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, 2013 and 2012 are summarized as follows:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Balance at beginning of period	$	26,135		$	31,784		$	30,056		$	4,944
	Loans charged off	(5,006		)	(977		)	(10,031		)	(2,574		)
	Recoveries	2,555			2,342			4,391			3,406
	Provision (recovery) for loan losses	(947		)	(3,992		)	(1,679		)	23,381
	Balance at end of period	$	22,737		$	29,157		$	22,737		$	29,157

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
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 period:
		Three Months Ended September 30,						Nine Months Ended September 30,
		2013			2012			2013			2012
		(in thousands)
	Goodwill
	Goodwill at beginning of period (1)	$	345,231		$	115,554		$	115,554		$	115,554
	Established through acquisitions	—			—			229,677			—
	Goodwill at end of period	345,231			115,554			345,231			115,554
	Other intangible assets, net
	Core deposit intangible:
	Gross core deposit intangible balance at beginning of period	47,698			32,441			32,441			32,441
	Accumulated amortization at beginning of period	(19,441		)	(14,545		)	(16,720		)	(12,275		)
	Core deposit intangible, net at beginning of period	28,257			17,896			15,721			20,166
	Established through acquisitions	—			—			15,257			—
	CDI current period amortization	(1,667		)	(1,093		)	(4,388		)	(3,363		)
	Total core deposit intangible, net at end of period	26,590			16,803			26,590			16,803
	Intangible assets not subject to amortization	919			—			919			—
	Other intangible assets, net at end of period	27,509			16,803			27,509			16,803
	Total goodwill and other intangible assets at end of period	$	372,740		$	132,357		$	372,740		$	132,357
Estimated Future Amortization Expense of Core Deposit Intangibles	'
	______________
	(1) Goodwill at beginning of period has been retrospectively adjusted for the three months ended September 30, 2013 due to adjustments to provisional amounts made related to the West Coast acquisition. See Note 3 to the Consolidated Financial Statements of this report for more information regarding this acquisition.
	The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2013 and the succeeding four years:
		Amount
		(in thousands)
	Year ending December 31,
	2013	$	1,657
	2014	5,963
	2015	4,934
	2016	4,195
	2017	3,361

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
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, 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, 2013	(in thousands)
	Beginning balance	$	(7,804	)	$	(1,406	)	$	(9,210	)
	Other comprehensive loss before reclassifications	5,943			—			5,943
	Amounts reclassified from accumulated other comprehensive income (2)	—			59			59
	Net current-period other comprehensive loss	5,943			59			6,002
	Ending balance	$	(1,861	)	$	(1,347	)	$	(3,208	)
	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 (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 and nine month periods ended September 30, 2013:
		Amount Reclassified from Accumulated Other Comprehensive Income						Affected line Item in the Consolidated Statement of Income
		Three Months Ended			Nine Months Ended
		30-Sep-13			September 30, 2013
		(in thousands)
	Unrealized gains and losses on available-for-sale securities
		$	—		$	462		Investment securities gains, net
		—			462			Total before tax
		—			(163		)	Income tax provision
		$	—		$	299		Net of tax
	Amortization of pension plan liability
	Actuarial losses	$	(92	)	$	(276	)	Compensation and employee benefits
		(92		)	(276		)	Total before tax
		33			98			Income tax benefit
		$	(59	)	$	(178	)	Net of tax

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables) (Not Designated as Hedging Instrument [Member])

9 Months Ended

Sep. 30, 2013

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, 2013 and December 31, 2012:

Asset Derivatives

Liability Derivatives

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Location

Location

(in thousands)

Interest rate contracts

Other assets

$

10,187

Other assets

$

14,921

Other liabilities

$

10,187

Other liabilities

$

14,921

Fair_Value_Accounting_and_Meas1

Fair Value Accounting and Measurement (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013 and December 31, 2012 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, 2013	(in thousands)
	Assets
	Securities available for sale
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	861,669	$	—		$	861,669	$	—
	State and municipal debt securities	354,895		—			354,895		—
	U.S. government agency and government-sponsored enterprise securities	327,530		—			327,530		—
	U.S. government securities	20,417		20,417			—		—
	Other securities	5,140		—			5,140		—
	Total securities available for sale	$	1,569,651	$	20,417		$	1,549,234	$	—
	Other assets (Interest rate contracts)	$	10,187	$	—		$	10,187	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	10,187	$	—		$	10,187	$	—
		Fair value		Fair Value Measurements at Reporting Date Using
				Level 1			Level 2		Level 3
	December 31, 2012	(in thousands)
	Assets
	Securities available for sale
	U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations	$	572,369	$	—		$	572,369	$	—
	State and municipal debt securities	285,575		—			285,575		—
	U.S. government agency and government-sponsored enterprise securities	120,501		—			120,501		—
	U.S. government securities	19,828		19,828			—		—
	Other securities	3,392		—			3,392		—
	Total securities available for sale	$	1,001,665	$	19,828		$	981,837	$	—
	Other assets (Interest rate contracts)	$	14,921	$	—		$	14,921	$	—
	Liabilities
	Other liabilities (Interest rate contracts)	$	14,921	$	—		$	14,921	$	—
Financial Assets Accounted For Fair Value On Nonrecurring Basis	'
	The following tables set forth the Company's assets that were measured using fair value estimates on a nonrecurring basis at September 30, 2013 and 2012.
		Fair value at September 30, 2013		Fair Value Measurements at Reporting Date Using							Losses During the Three Months Ended			Losses During the Nine Months Ended
				Level 1			Level 2		Level 3		September 30, 2013			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 at		Fair Value Measurements at Reporting Date Using							Gains (Losses) During the Three Months Ended			Losses During the Nine Months Ended
		September 30, 2012		Level 1			Level 2		Level 3		30-Sep-12			30-Sep-12
		(in thousands)
	Impaired loans	$	6,094	$	—		$	—	$	6,094	$	509		$	(3,377	)
	Noncovered OREO	1,807		—			—		1,807		(458		)	(3,117		)
	Covered OREO	1,021		—			—		1,021		(481		)	(1,025		)
	Noncovered OPPO	—		—			—		—		—			(1,990		)
		$	8,922	$	—		$	—	$	8,922	$	(430	)	$	(9,509	)
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, 2013 and December 31, 2012:
		September 30, 2013
		Carrying		Fair			Level 1		Level 2		Level 3
		Amount		Value
		(in thousands)
	Assets
	Cash and due from banks	$	200,282	$	200,282		$	200,282	$	—	$	—
	Interest-earning deposits with banks	54,470		54,470			54,470		—		—
	Securities available for sale	1,569,651		1,569,651			20,417		1,549,234		—
	FHLB stock	32,833		32,833			—		32,833		—
	Loans held for sale	840		840			—		840		—
	Loans	4,440,048		4,397,456			—		—		4,397,456
	FDIC loss-sharing asset	53,559		17,353			—		—		17,353
	Interest rate contracts	10,187		10,187			—		10,187		—
	Liabilities
	Deposits	$	5,948,967	$	5,948,473		$	5,413,557	$	534,916	$	—
	FHLB Advances	34,632		33,301			—		33,301		—
	Repurchase agreements	25,000		26,207			—		26,207		—
	Interest rate contracts	10,187		10,187			—		10,187		—
		December 31, 2012
		Carrying		Fair			Level 1		Level 2		Level 3
		Amount		Value
		(in thousands)
	Assets
	Cash and due from banks	$	124,573	$	124,573		$	124,573	$	—	$	—
	Interest-earning deposits with banks	389,353		389,353			389,353		—		—
	Securities available for sale	1,001,665		1,001,665			19,828		981,837		—
	FHLB stock	21,819		21,819			—		21,819		—
	Loans held for sale	2,563		2,563			—		2,563		—
	Loans	2,864,803		2,944,317			—		—		2,944,317
	FDIC loss-sharing asset	96,354		26,543			—		—		26,543
	Interest rate contracts	14,921		14,921			—		14,921		—
	Liabilities
	Deposits	$	4,042,085	$	4,043,221		$	3,549,821	$	493,400	$	—
	FHLB Advances	6,644		5,894			—		5,894		—
	Repurchase agreements	25,000		26,464			—		26,464		—
	Interest rate contracts	14,921		14,921			—		14,921		—
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, 2013		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		(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 and inventory).
	(2) Quantitative disclosures are not provided for noncovered OREO and covered OREO because there were no adjustments made to the appraisal value during the current period.
		Fair value at		Valuation Technique		Unobservable Input	Range (Weighted Average) (1)
		September 30, 2012
		(dollars in thousands)
	Impaired loans - real estate collateral	$	4,148	Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Impaired loans - other collateral (3)	1,946		Fair Market Value of Collateral		Adjustment to Stated value	0% - 70% (27%)
	Noncovered OREO	1,807		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Covered OREO	1,021		Fair Market Value of Collateral		Adjustment to Appraisal Value	N/A (2)
	Noncovered OPPO	—		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 and inventory).
	(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate, noncovered OREO, covered OREO and noncovered OPPO because there were no adjustments made to the appraisal value during the current period.
	(3) Other collateral consists of accounts receivable and inventory

Earnings_per_Common_Share_Tabl

Earnings per Common Share (Tables)	9 Months Ended
	Sep. 30, 2013
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, 2013 and 2012:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
		(in thousands except per share)
	Basic EPS:
	Net income	$	13,276	$	11,880	$	40,043	$	32,681
	Less: Earnings allocated to participating securities
	Preferred shares	27		—		58		—
	Nonvested restricted shares	109		113		355		336
	Earnings allocated to common shareholders	$	13,140	$	11,767	$	39,630	$	32,345
	Weighted average common shares outstanding	50,834		39,289		47,032		39,248
	Basic earnings per common share	$	0.26	$	0.3	$	0.84	$	0.82
	Diluted EPS:
	Earnings allocated to common shareholders	$	13,142	$	11,767	$	39,635	$	32,345
	Weighted average common shares outstanding	50,834		39,289		47,032		39,248
	Dilutive effect of equity awards	1,463		2		915		3
	Weighted average diluted common shares outstanding	52,297		39,291		47,947		39,251
	Diluted earnings per common share	$	0.25	$	0.3	$	0.83	$	0.82
	Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive	138		53		99		46

Accounting_Pronouncements_Rece2

Accounting Pronouncements Recently Issued Adoption of new accounting guidance, impacts (Details) (USD $)	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue	($9.90)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	($6.40)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	($0.13)

Business_combinations_Details

Business combinations (Details) (USD $)	3 Months Ended	9 Months Ended			0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Apr. 02, 2013	Apr. 02, 2013	Sep. 30, 2013	Sep. 30, 2012
					West Coast Bancorp [Member]	West Coast Bancorp [Member]	West Coast Bancorp [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Business Acquisition, Pro Forma Revenue	'	'	'	'	'	$252,392,000	$322,941,000
Business Acquisition, Effective Date of Acquisition	'	'	'	'	1-Apr-13	'	'
business combination, provisional information, initial accounting incomplete, adjustment, other liabilities	1,800,000	'	'	'	'	'	'
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	622,000	'	'	'	'	'	'
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	1,100,000	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Purchase Price	'	'	'	'	540,791,000	'	'
Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents	'	'	'	'	110,440,000	'	'
Business Acquisition, Purchase Price Allocation, Current Assets, Marketable Securities	'	'	'	'	730,842,000	'	'
Business Acquisition, Purchase Price Allocation, FHLB Stock	'	'	'	'	11,824,000	'	'
Business Combination, Acquired Receivables, Fair Value	'	'	'	'	1,407,798,000	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	'	'	'	'	35,884,000	'	'
Business Acquisition, Purchase Price Allocation, Loans Covered By Loss Sharing	'	'	'	'	14,708,000	'	'
Business Acquisition, Percentage of Voting Interests Acquired	'	'	'	100.00%	'	'	'
Business Acquisition, Purchase Price Allocation, Goodwill Amount	'	'	'	'	229,677,000	'	'
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	'	'	'	'	15,257,000	'	'
Core deposit intangible acquired - percentage of core deposits acquired	'	'	'	0.89%	'	'	'
Business Acquisition, Purchase Price Allocation, Other Assets	'	'	'	'	76,088,000	'	'
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits	'	'	'	'	-1,883,407,000	'	'
Business Acquisition, Purchase Price Allocation, Federal Home Loan Bank Advances	'	'	'	'	-128,885,000	'	'
Business Acquisition, Purchase Price Allocation, Junior Subordinated Debentures	'	'	'	'	-51,000,000	'	'
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities	'	'	'	'	-28,435,000	'	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	'	'	'	'	311,114,000	'	'
Business Acquisition, Pro Forma Net Income (Loss)	'	53,053,000	67,162,000	'	'	'	'
Business Acquisition, Pro Forma Earnings Per Share, Basic	'	'	'	'	'	$1.04	$1.29
Business Acquisition, Pro Forma Earnings Per Share, Diluted	'	'	'	'	'	$1.01	$1.29
Business Combination, Acquisition Related Costs	'	'	'	'	'	$17,600,000	'

Securities_Securities_Availabl

Securities (Securities Available for Sale) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$1,572,523	$969,359
Available-for-sale Securities, Gross Unrealized Gain, instant	26,872	38,606
Gross Unrealized Losses	29,744	6,300
Fair Value	1,569,651	1,001,665
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	866,128	561,076
Available-for-sale Securities, Gross Unrealized Gain, instant	12,538	16,719
Gross Unrealized Losses	16,997	5,426
Fair Value	861,669	572,369
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	344,053	265,070
Available-for-sale Securities, Gross Unrealized Gain, instant	13,824	20,893
Gross Unrealized Losses	2,982	388
Fair Value	354,895	285,575
U.S. Government and Government-Sponsored Enterprise Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	335,989	120,085
Available-for-sale Securities, Gross Unrealized Gain, instant	483	851
Gross Unrealized Losses	8,942	435
Fair Value	327,530	120,501
US Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	21,074	19,804
Available-for-sale Securities, Gross Unrealized Gain, instant	0	39
Gross Unrealized Losses	657	15
Fair Value	20,417	19,828
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	5,279	3,324
Available-for-sale Securities, Gross Unrealized Gain, instant	27	104
Gross Unrealized Losses	166	36
Fair Value	$5,140	$3,392

Securities_Schedule_of_Contrac

Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities [Abstract]	'
Due within one year, Amortized Cost	$23,249
Due after one year through five years, Amortized Cost	278,538
Due after five years through ten years, Amortized Cost	463,423
Due after ten years, Amortized Cost	802,034
No stated maturity date, Amortized Cost Basis	5,279
Total investment securities available-for-sale, Amortized Cost	1,572,523
Due within one year, Fair Value	23,493
Due after one year through five years, Fair Value	278,715
Due after five years through ten years, Fair Value	459,080
Due after ten years, Fair Value	803,223
No stated maturity date, Fair Value	5,140
Total investment securities available-for-sale, Fair Value	$1,569,651

Securities_Carrying_Value_of_S

Securities (Carrying Value of Securities Pledged as Collateral) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$355,497
Washington and Oregon State Public Deposits [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	267,646
Federal Reserve Bank Advances [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	44,526
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Carrying amount of securities pledged as collateral	$43,325

Securities_Summary_of_Gross_Un

Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	($26,872)	($38,606)
Less than 12 Months Fair Value	799,158	254,666
Less than 12 Months Unrealized Losses	-25,125	-5,923
12 Months or More Fair Value	67,664	13,378
12 Months or More Unrealized Losses	-4,619	-377
Total Fair Value	866,822	268,044
Total Unrealized Losses	-29,744	-6,300
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-29,744	-6,300
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	-12,538	-16,719
Less than 12 Months Fair Value	385,222	167,739
Less than 12 Months Unrealized Losses	-12,567	-5,090
12 Months or More Fair Value	64,044	12,204
12 Months or More Unrealized Losses	-4,430	-336
Total Fair Value	449,266	179,943
Total Unrealized Losses	-16,997	-5,426
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-16,997	-5,426
State and Municipal Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-13,824	-20,893
Less than 12 Months Fair Value	101,176	20,413
Less than 12 Months Unrealized Losses	-2,935	-383
12 Months or More Fair Value	807	210
12 Months or More Unrealized Losses	-47	-5
Total Fair Value	101,983	20,623
Total Unrealized Losses	-2,982	-388
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-2,982	-388
US Government Corporations and Agencies Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-483	-851
Less than 12 Months Fair Value	290,257	56,600
Less than 12 Months Unrealized Losses	-8,942	-435
12 Months or More Fair Value	0	0
12 Months or More Unrealized Losses	0	0
Total Fair Value	290,257	56,600
Total Unrealized Losses	-8,942	-435
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-8,942	-435
US Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	0	-39
Less than 12 Months Fair Value	20,217	9,914
Less than 12 Months Unrealized Losses	-657	-15
12 Months or More Fair Value	0	0
12 Months or More Unrealized Losses	0	0
Total Fair Value	20,217	9,914
Total Unrealized Losses	-657	-15
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	-657	-15
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale Debt Securities Gross Unrealized Gain, instant	-27	-104
Less than 12 Months Fair Value	2,286	0
Less than 12 Months Unrealized Losses	-24	0
12 Months or More Fair Value	2,813	964
12 Months or More Unrealized Losses	-142	-36
Total Fair Value	5,099	964
Total Unrealized Losses	-166	-36
Available-for-sale Debt Securities, Gross Unrealized Loss, instant	($166)	($36)

Securities_Narrative_Details

Securities (Narrative) (Details)	Sep. 30, 2013
	security
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
Number Of Securities In Continuous Loss Position For Twelve Months or More	0
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	4
Number Of Securities In Continuous Loss Position For Twelve Months or More	0
Municipal Bonds [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	109
Number Of Securities In Continuous Loss Position For Twelve Months or More	2
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	67
Number Of Securities In Continuous Loss Position For Twelve Months or More	6
Other Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Number Of Securities In Unrealized Loss Position	2
Number Of Securities In Continuous Loss Position For Twelve Months or More	1

Noncovered_Loans_Narrative_Det

Noncovered Loans (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
	contract
Financing Receivable, Recorded Investment [Line Items]	'	'
Loans to related parties	$14,100,000	$14,200,000
Loans and Leases Receivable, Related Parties, Additions	1,900,000	'
Repayments on related party loans	2,000,000	'
Additional funds committed to lend on loans classified as TDR	1,700,000	236,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	'
Loans Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	649,800,000	443,400,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$49,400,000	$13,800,000

Noncovered_Loans_Analysis_of_L

Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	$75,293	'	$7,767	'	'	'
Loans, net	4,440,048	'	2,864,803	'	'	'
Loans held for sale	840	'	2,563	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Deferred Income	75,293	'	7,767	'	'	'
Recorded Investment	4,193,732	'	2,525,710	'	'	'
Allowance for loan losses	55,844	51,698	52,244	51,527	52,196	53,041
Loans, net	4,137,888	'	2,473,466	'	'	'
Loans held for sale	840	'	2,563	'	'	'
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer, Mortgage	106,686	'	43,922	'	'	'
Loans and Leases Receivable, Gross, Consumer, Construction	53,158	'	50,602	'	'	'
Allowance for loan losses	1,341	672	694	565	673	654
Commercial and Multifamily Residential [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial, Mortgage	2,048,910	'	1,061,201	'	'	'
Loans Receivable, Gross, Commercial, Construction	128,120	'	65,101	'	'	'
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable, Gross, Commercial and Industrial	1,569,343	'	1,155,158	'	'	'
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Mortgage	2,155,596	'	1,105,123	'	'	'
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans Receivable Real Estate Construction	181,278	'	115,703	'	'	'
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Consumer	362,808	'	157,493	'	'	'
Allowance for loan losses	$2,519	$2,455	$2,437	$2,166	$2,049	$2,719

Noncovered_Loans_Analysis_of_N

Noncovered Loans (Analysis of Nonaccrual Loans) (Details) (Noncovered Loans [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	$35,961	$37,395
Unpaid Principal Balance Nonaccrual Loans	58,650	57,877
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	4,036	1,643
Unpaid Principal Balance Nonaccrual Loans	6,012	1,940
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	11,839	9,037
Unpaid Principal Balance Nonaccrual Loans	18,194	17,821
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	156	262
Unpaid Principal Balance Nonaccrual Loans	181	262
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	2,220	2,349
Unpaid Principal Balance Nonaccrual Loans	4,058	2,672
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	890	4,076
Unpaid Principal Balance Nonaccrual Loans	1,299	7,491
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	7,756	8,520
Unpaid Principal Balance Nonaccrual Loans	11,560	10,815
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	5,379	6,608
Unpaid Principal Balance Nonaccrual Loans	7,271	7,741
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	3,226	3,084
Unpaid Principal Balance Nonaccrual Loans	8,134	6,704
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded Investment Nonaccrual Loans	459	1,816
Unpaid Principal Balance Nonaccrual Loans	$1,941	$2,431

Noncovered_Loans_Analysis_of_t

Noncovered Loans (Analysis of the Aged Loan Portfolio) (Details) (Noncovered Loans [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	$4,128,467	$2,476,797
30 - 59 Days Past Due	23,351	9,168
60 - 89 Days Past Due	5,951	2,350
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2	0
Total Past Due	29,304	11,518
Nonaccrual Loans	35,961	37,395
Loans Receivable, Net	4,193,732	2,525,710
Consumer Portfolio Segment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	325,614	155,207
30 - 59 Days Past Due	1,375	387
60 - 89 Days Past Due	369	362
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1	0
Total Past Due	1,745	749
Nonaccrual Loans	4,036	1,643
Loans Receivable, Net	331,395	157,599
Secured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,465,682	1,091,770
30 - 59 Days Past Due	6,520	4,259
60 - 89 Days Past Due	3,306	1,485
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1	0
Total Past Due	9,827	5,744
Nonaccrual Loans	11,839	9,037
Loans Receivable, Net	1,487,348	1,106,551
Unsecured Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	74,756	44,817
30 - 59 Days Past Due	72	252
60 - 89 Days Past Due	4	12
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	76	264
Nonaccrual Loans	156	262
Loans Receivable, Net	74,988	45,343
One-to-Four Family Residential [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	99,413	41,508
30 - 59 Days Past Due	2,232	193
60 - 89 Days Past Due	224	142
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	2,456	335
Nonaccrual Loans	2,220	2,349
Loans Receivable, Net	104,089	44,192
Commercial Land [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	133,942	42,818
30 - 59 Days Past Due	0	311
60 - 89 Days Past Due	0	122
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	0	433
Nonaccrual Loans	890	4,076
Loans Receivable, Net	134,832	47,327
Income Property Multifamily [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	1,125,012	603,339
30 - 59 Days Past Due	7,687	2,726
60 - 89 Days Past Due	0	227
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	7,687	2,953
Nonaccrual Loans	7,756	8,520
Loans Receivable, Net	1,140,455	614,812
Owner Occupied Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	39,064	36,211
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	39,064	36,211
Owner Occupied [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	728,002	387,525
30 - 59 Days Past Due	5,465	1,040
60 - 89 Days Past Due	2,048	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total Past Due	7,513	1,040
Nonaccrual Loans	5,379	6,608
Loans Receivable, Net	740,894	395,173
Land And Acquisition [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	9,014	15,412
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	3,226	3,084
Loans Receivable, Net	12,240	18,496
Residential Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	39,928	29,848
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	459	1,816
Loans Receivable, Net	40,387	31,664
Income Property Multifamily Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current Loans	88,040	28,342
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	$88,040	$28,342

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	$4,164,561	'	$4,164,561	'	$2,491,049
Recorded Investment of Loans Individually Measured for Specific Impairment	29,171	'	29,171	'	34,661
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Related Allowance	0	'	0	'	0
Average Recorded Investment Impaired Loans	33,163	45,206	33,454	50,741	'
Interest Recognized on Impaired Loans	296	320	1,026	891	'
Income Property Multifamily Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	88,040	'	88,040	'	28,342
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	1,877	0	3,961	'
Interest Recognized on Impaired Loans	0	0	0	0	'
Consumer Portfolio Segment [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	331,273	'	331,273	'	157,472
Recorded Investment of Loans Individually Measured for Specific Impairment	122	'	122	'	127
Average Recorded Investment Impaired Loans	423	1,045	275	1,359	'
Interest Recognized on Impaired Loans	2	11	5	33	'
Residential Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	40,387	'	40,387	'	29,707
Recorded Investment of Loans Individually Measured for Specific Impairment	0	'	0	'	1,957
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Related Allowance	0	'	0	'	0
Average Recorded Investment Impaired Loans	0	2,792	526	3,539	'
Interest Recognized on Impaired Loans	0	12	0	17	'
Land And Acquisition [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	9,744	'	9,744	'	15,677
Recorded Investment of Loans Individually Measured for Specific Impairment	2,496	'	2,496	'	2,819
Recorded Investment	115	'	115	'	0
Unpaid Principal Balance	114	'	114	'	0
Related Allowance	73	'	73	'	0
Average Recorded Investment Impaired Loans	2,889	3,213	2,794	4,876	'
Interest Recognized on Impaired Loans	1	0	4	0	'
Owner Occupied [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	730,787	'	730,787	'	383,269
Recorded Investment of Loans Individually Measured for Specific Impairment	10,107	'	10,107	'	11,904
Recorded Investment	601	'	601	'	608
Unpaid Principal Balance	599	'	599	'	610
Related Allowance	26	'	26	'	38
Average Recorded Investment Impaired Loans	9,822	13,185	10,721	13,668	'
Interest Recognized on Impaired Loans	231	244	740	762	'
Owner Occupied Construction [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	39,064	'	39,064	'	36,211
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	1,131,432	'	1,131,432	'	606,656
Recorded Investment of Loans Individually Measured for Specific Impairment	9,023	'	9,023	'	8,156
Recorded Investment	0	'	0	'	2,670
Unpaid Principal Balance	0	'	0	'	2,727
Related Allowance	0	'	0	'	1,040
Average Recorded Investment Impaired Loans	10,358	7,577	9,534	7,830	'
Interest Recognized on Impaired Loans	22	55	168	60	'
Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	134,266	'	134,266	'	44,672
Recorded Investment of Loans Individually Measured for Specific Impairment	566	'	566	'	2,655
Recorded Investment	0	'	0	'	0
Unpaid Principal Balance	0	'	0	'	0
Related Allowance	0	'	0	'	0
Average Recorded Investment Impaired Loans	1,456	3,079	2,085	3,242	'
Interest Recognized on Impaired Loans	48	0	48	0	'
One-to-Four Family Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	102,547	'	102,547	'	42,103
Recorded Investment of Loans Individually Measured for Specific Impairment	1,542	'	1,542	'	2,089
Recorded Investment	335	'	335	'	345
Unpaid Principal Balance	358	'	358	'	364
Related Allowance	103	'	103	'	112
Average Recorded Investment Impaired Loans	1,537	2,014	1,677	2,140	'
Interest Recognized on Impaired Loans	16	-9	47	0	'
Unsecured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	74,945	'	74,945	'	45,251
Recorded Investment of Loans Individually Measured for Specific Impairment	43	'	43	'	92
Recorded Investment	43	'	43	'	92
Unpaid Principal Balance	43	'	43	'	92
Related Allowance	43	'	43	'	92
Average Recorded Investment Impaired Loans	47	118	68	118	'
Interest Recognized on Impaired Loans	1	1	2	5	'
Secured Loans [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,482,076	'	1,482,076	'	1,101,689
Recorded Investment of Loans Individually Measured for Specific Impairment	5,272	'	5,272	'	4,862
Recorded Investment	573	'	573	'	690
Unpaid Principal Balance	637	'	637	'	1,994
Related Allowance	241	'	241	'	113
Average Recorded Investment Impaired Loans	6,631	10,306	5,774	10,008	'
Interest Recognized on Impaired Loans	-25	6	12	14	'
ERROR in label resolution.	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	1,667	'	1,667	'	4,405
Unpaid Principal Balance	1,751	'	1,751	'	5,787
Related Allowance	486	'	486	'	1,395
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	27,504	'	27,504	'	30,256
Unpaid Principal Balance	38,722	'	38,722	'	44,410
Impaired Loans Without Recorded Allowance [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	122	'	122	'	127
Unpaid Principal Balance	121	'	121	'	127
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	'	1,957
Unpaid Principal Balance	0	'	0	'	2,570
Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	2,381	'	2,381	'	2,819
Unpaid Principal Balance	3,149	'	3,149	'	4,813
Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	9,507	'	9,507	'	11,296
Unpaid Principal Balance	13,207	'	13,207	'	14,642
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	9,023	'	9,023	'	5,486
Unpaid Principal Balance	13,319	'	13,319	'	7,860
Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	566	'	566	'	2,655
Unpaid Principal Balance	899	'	899	'	5,727
Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'
Recorded Investment	1,207	'	1,207	'	1,744
Unpaid Principal Balance	2,127	'	2,127	'	1,902
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	4,698	'	4,698	'	4,172
Unpaid Principal Balance	$5,900	'	$5,900	'	$6,769

Noncovered_Loans_Noncovered_Lo

Noncovered Loans Noncovered Loans (Analysis of Troubled Debt Restructurings) (Details) (Noncovered Loans [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
	Modifications
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	7
Pre-Modification Outstanding Recorded Investment	$1,712
Post-Modification Outstanding Recorded Investment	1,712
Secured Loans [Member]	'
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	1
Pre-Modification Outstanding Recorded Investment	343
Post-Modification Outstanding Recorded Investment	343
Commercial Land [Member]	'
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	1
Pre-Modification Outstanding Recorded Investment	137
Post-Modification Outstanding Recorded Investment	137
Income Property Multifamily [Member]	'
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	3
Pre-Modification Outstanding Recorded Investment	943
Post-Modification Outstanding Recorded Investment	943
Owner Occupied [Member]	'
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	1
Pre-Modification Outstanding Recorded Investment	172
Post-Modification Outstanding Recorded Investment	172
Land And Acquisition [Member]	'
Financing Receivable, Modifications [Line Items]	'
Number of TDR Modifications	1
Pre-Modification Outstanding Recorded Investment	117
Post-Modification Outstanding Recorded Investment	$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			9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Apr. 02, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
					Maximum [Member]	West Coast Bancorp [Member]	Noncovered Loans [Member]	Noncovered Loans [Member]	Noncovered Loans [Member]	Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'	'	'
Percentage of unallocated loan amount	'	'	'	'	5.00%	'	'	'	'	'
Provision for loan and lease losses	'	$3,581,000	$34,506,000	'	'	'	$4,260,000	$2,875,000	$5,260,000	$11,125,000
discount on acquired loans	'	'	'	88,800,000	'	'	'	'	'	'
Discount Accretion on Other Acquired Loans	'	'	'	'	'	19,700,000	'	'	'	'
Change in Accounting Estimate, Financial Effect	2,800,000	'	'	'	'	'	'	'	'	'
Change in estimate, impact to earnings per share	($0.05)	($0.06)	'	'	'	'	'	'	'	'

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Provision for loan and lease losses	'	'	$3,581	$34,506
Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	51,698	52,196	52,244	53,041
Charged-offs	-1,912	-5,241	-6,670	-17,272
Recoveries	1,798	1,697	5,010	4,633
Provision for loan and lease losses	4,260	2,875	5,260	11,125
Ending balance	55,844	51,527	55,844	51,527
Specific Reserve	486	730	486	730
General Allocation	55,358	50,797	55,358	50,797
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	2,455	2,049	2,437	2,719
Charged-offs	-453	-500	-1,262	-1,968
Recoveries	112	350	353	809
Provision for loan and lease losses	405	267	991	606
Ending balance	2,519	2,166	2,519	2,166
Specific Reserve	0	0	0	0
General Allocation	2,519	2,166	2,519	2,166
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	983	493	1,011	694
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	-983	682	-1,011	481
Ending balance	0	1,175	0	1,175
Specific Reserve	0	0	0	0
General Allocation	0	1,175	0	1,175
Secured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	30,572	26,505	27,270	24,745
Charged-offs	-392	-3,744	-2,236	-8,126
Recoveries	743	194	1,135	1,184
Provision for loan and lease losses	3,187	3,007	7,941	8,159
Ending balance	34,110	25,962	34,110	25,962
Specific Reserve	241	315	241	315
General Allocation	33,869	25,647	33,869	25,647
Unsecured Loans [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	821	772	753	689
Charged-offs	-363	-31	-794	-52
Recoveries	111	83	184	130
Provision for loan and lease losses	491	-56	917	1
Ending balance	1,060	768	1,060	768
Specific Reserve	43	100	43	100
General Allocation	1,017	668	1,017	668
One-to-Four Family Residential [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	672	673	694	654
Charged-offs	-47	-49	-191	-499
Recoveries	39	157	180	202
Provision for loan and lease losses	677	-216	658	208
Ending balance	1,341	565	1,341	565
Specific Reserve	103	69	103	69
General Allocation	1,238	496	1,238	496
Commercial Land [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	691	270	460	488
Charged-offs	-9	-55	-20	-437
Recoveries	126	0	153	0
Provision for loan and lease losses	-260	207	-45	371
Ending balance	548	422	548	422
Specific Reserve	0	1	0	1
General Allocation	548	421	548	421
Income Property Multifamily [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	9,695	8,726	11,033	9,551
Charged-offs	-132	-436	-950	-3,959
Recoveries	154	357	260	710
Provision for loan and lease losses	85	387	-541	2,732
Ending balance	9,802	9,034	9,802	9,034
Specific Reserve	0	0	0	0
General Allocation	9,802	9,034	9,802	9,034
Owner Occupied [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	4,515	9,037	6,362	9,606
Charged-offs	-516	-101	-1,084	-712
Recoveries	52	89	96	628
Provision for loan and lease losses	637	-694	-686	-1,191
Ending balance	4,688	8,331	4,688	8,331
Specific Reserve	26	245	26	245
General Allocation	4,662	8,086	4,662	8,086
Land And Acquisition [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	769	1,651	1,171	2,331
Charged-offs	0	-307	-32	-809
Recoveries	366	404	2,541	827
Provision for loan and lease losses	-410	-279	-2,955	-880
Ending balance	725	1,469	725	1,469
Specific Reserve	73	0	73	0
General Allocation	652	1,469	652	1,469
Residential Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	204	1,197	635	864
Charged-offs	0	-18	-101	-617
Recoveries	95	0	108	79
Provision for loan and lease losses	426	3	83	856
Ending balance	725	1,182	725	1,182
Specific Reserve	0	0	0	0
General Allocation	725	1,182	725	1,182
Income Property Multifamily Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	241	755	316	665
Charged-offs	0	0	0	-93
Recoveries	0	63	0	64
Provision for loan and lease losses	17	-456	-58	-274
Ending balance	258	362	258	362
Specific Reserve	0	0	0	0
General Allocation	258	362	258	362
Owner Occupied Construction [Member] | Noncovered Loans [Member]	'	'	'	'
Allowance for Loan and Lease Losses [Roll Forward]	'	'	'	'
Beginning balance	80	68	102	35
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	-12	23	-34	56
Ending balance	68	91	68	91
Specific Reserve	0	0	0	0
General Allocation	$68	$91	$68	$91

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance For Loan And Lease Losses And Unfunded Loan Commitments And Letters Of Credit	'	'	'	'
Beginning balance	$2,465	$1,665	$1,915	$1,535
Allowance for Loan and Lease Losses, Net Changes In Unfunded Commitments and Letters Of Credit Allowance	200	250	750	380
Ending balance	$2,665	$1,915	$2,665	$1,915

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, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans, net	$4,440,048	'	$2,864,803	'	'	'
Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,193,732	'	2,525,710	'	'	'
Recorded Investment	4,193,732	'	2,525,710	'	'	'
Loans and Leases Receivable, Allowance	55,844	51,698	52,244	51,527	52,196	53,041
Loans, net	4,137,888	'	2,473,466	'	'	'
Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,973,472	'	2,336,039	'	'	'
Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	55,176	'	37,758	'	'	'
Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	164,932	'	151,913	'	'	'
Doubtful [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	152	'	0	'	'	'
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	331,395	'	157,599	'	'	'
Loans and Leases Receivable, Allowance	2,519	2,455	2,437	2,166	2,049	2,719
Consumer Portfolio Segment [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	324,274	'	151,049	'	'	'
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	331	'	75	'	'	'
Consumer Portfolio Segment [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	6,789	'	6,475	'	'	'
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	'	0	'	'	'
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	1	'	0	'	'	'
Secured Loans [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,487,348	'	1,106,551	'	'	'
Loans and Leases Receivable, Allowance	34,110	30,572	27,270	25,962	26,505	24,745
Secured Loans [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,362,097	'	1,011,722	'	'	'
Secured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	38,018	'	29,222	'	'	'
Secured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	87,232	'	65,607	'	'	'
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	1	'	0	'	'	'
Unsecured Loans [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	74,988	'	45,343	'	'	'
Loans and Leases Receivable, Allowance	1,060	821	753	768	772	689
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	74,705	'	44,788	'	'	'
Unsecured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	23	'	26	'	'	'
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	260	'	529	'	'	'
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	104,089	'	44,192	'	'	'
Loans and Leases Receivable, Allowance	1,341	672	694	565	673	654
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	94,947	'	40,346	'	'	'
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	1,687	'	406	'	'	'
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	7,455	'	3,440	'	'	'
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	134,832	'	47,327	'	'	'
Loans and Leases Receivable, Allowance	548	691	460	422	270	488
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	128,624	'	43,401	'	'	'
Commercial Land [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,140	'	0	'	'	'
Commercial Land [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,068	'	3,926	'	'	'
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	1,140,455	'	614,812	'	'	'
Loans and Leases Receivable, Allowance	9,802	9,695	11,033	9,034	8,726	9,551
Income Property Multifamily [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,097,644	'	581,671	'	'	'
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	7,304	'	3,688	'	'	'
Income Property Multifamily [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	35,357	'	29,453	'	'	'
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	150	'	0	'	'	'
Owner Occupied [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	740,894	'	395,173	'	'	'
Loans and Leases Receivable, Allowance	4,688	4,515	6,362	8,331	9,037	9,606
Owner Occupied [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	721,373	'	357,063	'	'	'
Owner Occupied [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,521	'	1,848	'	'	'
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	18,000	'	36,262	'	'	'
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	12,240	'	18,496	'	'	'
Loans and Leases Receivable, Allowance	725	769	1,171	1,469	1,651	2,331
Land And Acquisition [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	8,003	'	12,741	'	'	'
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	172	'	1,351	'	'	'
Land And Acquisition [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,065	'	4,404	'	'	'
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	40,387	'	31,664	'	'	'
Loans and Leases Receivable, Allowance	725	204	635	1,182	1,197	864
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	34,950	'	28,705	'	'	'
Residential Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,980	'	1,142	'	'	'
Residential Construction [Member] | Substandard [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,457	'	1,817	'	'	'
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	88,040	'	28,342	'	'	'
Loans and Leases Receivable, Allowance	258	241	316	362	755	665
Income Property Multifamily Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	87,791	'	28,342	'	'	'
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	249	'	0	'	'	'
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	39,064	'	36,211	'	'	'
Loans and Leases Receivable, Allowance	68	80	102	91	68	35
Owner Occupied Construction [Member] | Pass [Member] | Noncovered Loans [Member]	'	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	39,064	'	36,211	'	'	'
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	0	'	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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Real Estate Owned [Line Items]	'	'	'	'
Balance, beginning of period	'	'	$26,987	'
Proceeds from sale of OREO property	'	'	-10,779	-15,069
Gain (loss) on sale of OREO	'	'	8,745	8,604
Total OREO, end of period	36,273	'	36,273	'
Noncovered Loans [Member]	'	'	'	'
Other Real Estate Owned [Line Items]	'	'	'	'
Balance, beginning of period	24,339	13,925	10,676	22,893
Transfers in, net of write-downs ($48, $24, $90 and $24)	4,413	139	9,190	6,527
Transfers in, write-downs	48	24	'	'
OREO improvements	0	0	0	11
Additional OREO write-down	-1,066	-458	-1,636	-4,232
Proceeds from sale of OREO property	-4,673	-3,170	-10,295	-15,069
Gain (loss) on sale of OREO	530	439	900	745
Total OREO, end of period	$23,543	$10,875	$23,543	$10,875

Covered_Assets_and_FDIC_Losssh2

Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Amount of Estimated Clawback Liability	$3,800,000	'	$3,800,000	'
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition	'	'	'10 years 45 days	'
Provision for loan and lease losses	'	'	3,581,000	34,506,000
Federal deposit insurance corporation loss-sharing indemnified assets	48,400,000	'	48,400,000	'
Federal deposit insurance corporation loss-sharing indemnified assets receivable	5,200,000	'	5,200,000	'
FDIC Loss-sharing Asset, Period Increase (Decrease)	1,300,000	'	'	'
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	-947,000	-3,992,000	-1,679,000	23,381,000
Impairment expenses	'	'	929,000	'
Negative provision to adjust allowance for loss	'	'	$750,000	'
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, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans, net	$4,440,048	'	$2,864,803	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	374,342	'	500,794	'	'	'
Valuation discount on covered loans	49,445	'	79,401	'	'	'
Allowance for loan losses	22,737	26,135	30,056	29,157	31,784	4,944
Loans, net	302,160	'	391,337	'	'	'
Commercial Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	87,366	'	125,373	'	'	'
Real Estate Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	226,600	'	290,256	'	'	'
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	16,018	'	25,398	'	'	'
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	7,146	'	15,251	'	'	'
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	23,164	'	40,649	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	37,212	'	44,516	'	'	'
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	44,966	'	57,150	'	'	'
Commercial and Multifamily Residential [Member] | Covered Loans [Member]	'	'	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	$181,634	'	$233,106	'	'	'

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$140,511	$214,061	$166,888	$259,669
Accretion	-12,243	-19,571	-40,240	-69,045
Disposals	-5,772	-3,146	-621	-8,218
Reclassifications (to) from nonaccretable difference	-3,013	-2,861	-6,544	6,077
Balance at end of period	$119,483	$188,483	$119,483	$188,483

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Provision for loan and lease losses	'	'	$3,581	$34,506
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Beginning balance	26,135	31,784	30,056	4,944
Loans charged off	-5,006	-977	-10,031	-2,574
Recoveries	2,555	2,342	4,391	3,406
Provision for loan and lease losses	-947	-3,992	-1,679	23,381
Ending balance	$22,737	$29,157	$22,737	$29,157

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	'	'	$26,987	'
Proceeds from sale of OREO property	'	'	-10,779	-15,069
Gain on sale of OREO	'	'	8,745	8,604
Total OREO, end of period	36,273	'	36,273	'
Covered Loans [Member]	'	'	'	'
Covered Assets And FDIC Loss Sharing Asset [Line Items]	'	'	'	'
Balance, beginning of period	12,854	19,079	16,311	28,126
Transfers in	3,559	3,096	8,089	8,497
Additional OREO write-down	-199	-730	-293	-2,769
Proceeds from sale of OREO property	-5,408	-6,822	-19,222	-25,202
Gain on sale of OREO	1,924	1,888	7,845	7,859
Total OREO, end of period	$12,730	$16,511	$12,730	$16,511

Covered_Assets_and_FDIC_Losssh7

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset	'	'	'	'
Balance at beginning of period	$67,374	$140,003	$96,354	$175,071
Cash received from the FDIC	-1,484	-14,881	-7,871	-49,194
FDIC reimbursable losses, net	-505	-494	522	587
Amortization, net	-9,890	-9,694	-29,470	-33,418
Impairment	-758	-3,193	-1,343	18,705
Sale of other real estate	-1,479	-1,315	-5,076	-4,881
Write-downs of other real estate	220	1,141	373	4,503
Other	81	110	70	304
Balance at end of period	$53,559	$111,677	$53,559	$111,677

Covered_Assets_and_FDIC_Losssh8

Covered Assets and FDIC Loss-sharing Asset Covered Loans - Credit Quality Indicator (Details) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Net Reported Amount	$4,440,048	'	$2,864,803	'	'	'
Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	374,342	'	500,794	'	'	'
Valuation discount on covered loans	49,445	'	79,401	'	'	'
Loans and Leases Receivable, Allowance	22,737	26,135	30,056	29,157	31,784	4,944
Loans and Leases Receivable, Net Reported Amount	302,160	'	391,337	'	'	'
Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	286,795	'	356,520	'	'	'
Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	12,188	'	11,003	'	'	'
Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	75,332	'	133,271	'	'	'
Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	27	'	0	'	'	'
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	'	'	'
Real Estate Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	226,600	'	290,256	'	'	'
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	23,164	'	40,649	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	37,212	'	44,516	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	33,421	'	38,973	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	35	'	381	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,729	'	5,162	'	'	'
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	27	'	0	'	'	'
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	83,857	'	118,594	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	56,973	'	71,621	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,859	'	1,823	'	'	'
Secured Loans [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	24,025	'	45,150	'	'	'
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	3,509	'	6,779	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,018	'	4,988	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	396	'	0	'	'	'
Unsecured Loans [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	95	'	1,791	'	'	'
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	44,966	'	57,150	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	36,419	'	44,782	'	'	'
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	1,854	'	1,344	'	'	'
One-to-Four Family Residential [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	6,693	'	11,024	'	'	'
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	19,979	'	26,628	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	11,978	'	16,336	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	205	'	0	'	'	'
Commercial Land [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	7,796	'	10,292	'	'	'
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	75,609	'	105,384	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	59,736	'	81,205	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,966	'	864	'	'	'
Income Property Multifamily [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	11,907	'	23,315	'	'	'
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	86,046	'	101,094	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	73,045	'	82,222	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	114	'	3,318	'	'	'
Owner Occupied [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	12,887	'	15,554	'	'	'
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	9,845	'	13,833	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	4,688	'	4,817	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,759	'	3,273	'	'	'
Land And Acquisition [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,398	'	5,743	'	'	'
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	6,173	'	11,565	'	'	'
Residential Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	2,587	'	6,050	'	'	'
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	3,586	'	5,515	'	'	'
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	5,783	'	12,320	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	3,847	'	4,419	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Special Mention [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	0	'	0	'	'	'
Income Property Multifamily Construction [Member] | Covered Loans [Member] | Substandard [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,936	'	7,901	'	'	'
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	1,363	'	2,931	'	'	'
Owner Occupied Construction [Member] | Covered Loans [Member] | Pass [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	1,083	'	1,107	'	'	'
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	280	'	1,824	'	'	'
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	'	'	'
Commercial Portfolio Segment [Member] | Covered Loans [Member]	'	'	'	'	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'	'	'	'	'
Loans and Leases Receivable, Gross, Carrying Amount	$87,366	'	$125,373	'	'	'

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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Goodwill, Acquired During Period	$0	$0	$229,677	$0	'	'	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	919	0	919	0	'	'	'	'
Intangible Assets, Net (Excluding Goodwill)	27,509	16,803	27,509	16,803	'	15,721	'	'
Goodwill and Intangible Assets [Roll Forward]	'	'	'	'	'	'	'	'
Total goodwill, beginning of period	345,231	115,554	115,554	115,554	'	'	'	'
Total goodwill, end of period	345,231	115,554	345,231	115,554	'	'	'	'
CDI current period amortization	-1,666	-1,093	-4,388	-3,362	'	'	'	'
Total goodwill and intangible assets, end of period	372,740	132,357	372,740	132,357	'	'	'	'
Core Deposits [Member]	'	'	'	'	'	'	'	'
Goodwill and Intangible Assets [Line Items]	'	'	'	'	'	'	'	'
Finite Lived Intangible Assets Acquired During the Period	0	0	15,257	0	'	'	'	'
Estimated life of CDI, in years	'	'	'10 years	'	'	'	'	'
Goodwill and Intangible Assets [Roll Forward]	'	'	'	'	'	'	'	'
Gross core deposit intangible balance, beginning of period	'	'	'	'	47,698	32,441	32,441	32,441
Accumulated amortization at beginning of period	'	'	'	'	-19,441	-16,720	-14,545	-12,275
Core deposit intangible, net, beginning of period	28,257	17,896	15,721	20,166	'	'	'	'
CDI current period amortization	-1,667	-1,093	-4,388	-3,363	'	'	'	'
Total core deposit intangible, end of period	$26,590	$16,803	$26,590	$16,803	'	'	'	'

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Estimated Future Amortization Expense of Core Deposit Intangibles) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Future Amortization Expense For Core Deposit Intangibles	'
2013	$1,657
2014	5,963
2015	4,934
2016	4,195
2017	$3,361

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)	0 Months Ended		0 Months Ended				9 Months Ended
	Jan. 24, 2013	Sep. 30, 2013	Oct. 24, 2013	Jul. 25, 2013	Apr. 24, 2013	Apr. 02, 2013	Sep. 30, 2013
			Dividend Declared [Member]	Dividend Declared [Member]	Dividend Declared [Member]	Series B Preferred Stock [Member]	Series B 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	$0.10	'	$0.11	$0.10	$0.10	'	'

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, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'	'		'
Beginning balance	($9,210)	[1]	'	$20,149	[1]	'
Other comprehensive loss before reclassifications	5,943	[1]	'	-23,236	[1]	'
Amounts reclassified from accumulated other comprehensive income (2)	59	[1],[2]	'	-121	[1],[2]	'
Net current-period other comprehensive loss	6,002	[1]	2,644	-23,357	[1]	3,345
Ending balance	-3,208	[1]	'	-3,208	[1]	'
Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'		'	'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'	'		'
Beginning balance	-7,804	[1]	'	20,918	[1]	'
Other comprehensive loss before reclassifications	5,943	[1]	'	-22,480	[1]	'
Amounts reclassified from accumulated other comprehensive income (2)	0	[1],[2]	'	-299	[1],[2]	'
Net current-period other comprehensive loss	5,943	[1]	'	-22,779	[1]	'
Ending balance	-1,861	[1]	'	-1,861	[1]	'
Unrealized Gains and Losses on Pension Plan Liability [Member]	'		'	'		'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'		'	'		'
Beginning balance	-1,406	[1]	'	-769	[1]	'
Other comprehensive loss before reclassifications	0	[1]	'	-756	[1]	'
Amounts reclassified from accumulated other comprehensive income (2)	59	[1],[2]	'	178	[1],[2]	'
Net current-period other comprehensive loss	59	[1]	'	-578	[1]	'
Ending balance	($1,347)	[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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Investment securities gains, net	$0	$0	$462	$62
Compensation and employee benefits	33,287	21,523	90,597	64,484
Total before tax	20,010	16,535	59,126	44,901
Income tax provision	-6,734	-4,655	-19,083	-12,220
Net Income	13,276	11,880	40,043	32,681
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Investment securities gains, net	0	'	462	'
Total before tax	0	'	462	'
Income tax provision	0	'	-163	'
Net Income	0	'	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	-92	'	-276	'
Total before tax	-92	'	-276	'
Income tax provision	33	'	98	'
Net Income	($59)	'	($178)	'

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Details) (Not Designated as Hedging Instrument [Member], Interest Rate Contracts [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]	'	'
Derivative, Notional Amount	$164,500,000	$177,000,000
Other Assets [Member]	'	'
Derivative [Line Items]	'	'
Fair value of asset derivative instruments	10,187,000	14,921,000
Other Liabilities [Member]	'	'
Derivative [Line Items]	'	'
Fair value of liability derivative instruments	$10,187,000	$14,921,000

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, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	$1,569,651	$1,001,665
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	1,569,651	1,001,665
Other assets (Interest rate contracts)	10,187	14,921
Other liabilities (Interest rate contracts)	10,187	14,921
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	20,417	19,828
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	1,549,234	981,837
Other assets (Interest rate contracts)	10,187	14,921
Other liabilities (Interest rate contracts)	10,187	14,921
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	861,669	572,369
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	861,669	572,369
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	354,895	285,575
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	354,895	285,575
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	327,530	120,501
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	327,530	120,501
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 Treasury Securities [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities available for sale	20,417	19,828
US Treasury 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	20,417	19,828
US Treasury 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 Treasury 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	5,140	3,392
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	5,140	3,392
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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Impaired loans	'	$6,094	'	$6,094
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1,223	430	1,332	9,509
Assets, Fair Value Disclosure	4,258	8,922	4,258	8,922
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	'	6,094	'	6,094
Assets, Fair Value Disclosure	4,258	8,922	4,258	8,922
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)	'	-509	'	3,377
Covered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	544	1,021	544	1,021
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	544	1,021	544	1,021
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)	183	481	248	1,025
Noncovered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
OREO	3,714	1,807	3,714	1,807
OPPO	'	0	'	0
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
OPPO	'	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
OPPO	'	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	3,714	1,807	3,714	1,807
OPPO	'	0	'	0
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)	1,040	458	1,084	3,117
Noncovered Loans [Member] | Other Personal Property Owned [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value, Option, Changes in Fair Value, Gain (Loss)	'	$0	'	($1,990)

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 $)	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Impaired loans	'		6,094
Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Impaired loans	'		6,094
Noncovered Loans [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
OREO	3,714		1,807
OPPO	'		0
Noncovered Loans [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
OREO	3,714		1,807
OPPO	'		0
Covered Loans [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
OREO	544		1,021
Covered Loans [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
OREO	544		1,021
Real Estate Collateral [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Impaired loans	'		4,148
Other Collateral [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Impaired loans	'		1,946
Other Collateral [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Fair Value Inputs, Comparability Adjustments	'		0.00%	[1]
Other Collateral [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Fair Value Inputs, Comparability Adjustments	'		70.00%	[1]
Other Collateral [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'		'
Fair Value Inputs, Comparability Adjustments	50.00%	[1],[2]	27.00%	[1],[2]
[1]	(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable and inventory).
[2]	(3) 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, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'
Interest-earning deposits with banks	$54,470	$389,353
Securities available for sale	1,569,651	1,001,665
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	200,282	124,573
Interest-earning deposits with banks	54,470	389,353
Securities available for sale	1,569,651	1,001,665
FHLB stock	32,833	21,819
Loans held for sale	840	2,563
Loans	4,440,048	2,864,803
FDIC loss-sharing asset	53,559	96,354
Interest rate contracts	10,187	14,921
Liabilities	'	'
Deposits	5,948,967	4,042,085
FHLB Advances	34,632	6,644
Repurchase agreements	25,000	25,000
Interest rate contracts	10,187	14,921
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	200,282	124,573
Interest-earning deposits with banks	54,470	389,353
Securities available for sale	1,569,651	1,001,665
FHLB stock	32,833	21,819
Loans held for sale	840	2,563
Loans	4,397,456	2,944,317
FDIC loss-sharing asset	17,353	26,543
Interest rate contracts	10,187	14,921
Liabilities	'	'
Deposits	5,948,473	4,043,221
FHLB Advances	33,301	5,894
Repurchase agreements	26,207	26,464
Interest rate contracts	10,187	14,921
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets	'	'
Cash and due from banks	200,282	124,573
Interest-earning deposits with banks	54,470	389,353
Securities available for sale	20,417	19,828
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	5,413,557	3,549,821
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	1,549,234	981,837
FHLB stock	32,833	21,819
Loans held for sale	840	2,563
Loans	0	0
FDIC loss-sharing asset	0	0
Interest rate contracts	10,187	14,921
Liabilities	'	'
Deposits	534,916	493,400
FHLB Advances	33,301	5,894
Repurchase agreements	26,207	26,464
Interest rate contracts	10,187	14,921
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	4,397,456	2,944,317
FDIC loss-sharing asset	17,353	26,543
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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net Income	$13,276	$11,880	$40,043	$32,681
Earnings allocated to participating securities - nonvested restricted shares	109	113	355	336
Earnings allocated to participating securities - preferred shares	27	0	58	0
Earnings allocated to common shareholders, Basic	13,140	11,767	39,630	32,345
Weighted average common shares outstanding	50,834	39,289	47,032	39,248
Basic earnings per common share	$0.26	$0.30	$0.84	$0.82
Dilutive effect of equity awards and warrants	1,463	2	915	3
Earnings allocated to common shareholders, Diluted	$13,142	$11,767	$39,635	$32,345
Weighted average diluted common shares outstanding	52,297	39,291	47,947	39,251
Diluted earnings per common share	$0.25	$0.30	$0.83	$0.82
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive.	138	53	99	46