Business Combinations narrative (Details) (USD $)	7 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 02, 2013 West Coast Bancorp [Member]	Dec. 31, 2013 West Coast Bancorp [Member]	Dec. 31, 2012 West Coast Bancorp [Member]	Aug. 05, 2011 Bank of Whitman [Member] location	Dec. 31, 2012 Bank of Whitman [Member] location	May 27, 2011 First Heritage Bank [Member] location	Dec. 31, 2012 First Heritage Bank [Member]	May 20, 2011 Summit Bank [Member]	Dec. 31, 2012 Summit Bank [Member]	May 27, 2011 Scenario, Previously Reported [Member] First Heritage Bank [Member]	May 20, 2011 Scenario, Previously Reported [Member] Summit Bank [Member]
Business Acquisition [Line Items]
Business Combination, Purchase Price Allocation, Goodwill Amount						$ 228,398,000					$ 4,023,000		$ 1,892,000
Business Acquisition, Purchase Price Allocation, Loans Covered By Loss Sharing											8,225,000		2,162,000		8,300,000	2,700,000
Business Acquisition, Effective Date of Acquisition						Apr. 01, 2013			Aug. 05, 2011		May 27, 2011		May 20, 2011
Business Combination, Acquired Receivables, Fair Value						1,407,798,000			200,041,000		81,488,000		69,783,000		81,900,000	71,400,000
Number Of Branch Locations To Be Acquired									9		5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net						312,393,000			1,830,000
Gain on bank acquisitions, net of tax			0	0	1,830,000				1,800,000
Business Combination, Purchase Price Allocation, Amortizable Intangible Assets						15,257,000			3,943,000		1,337,000		509,000
Business Combination, Acquisition Related Costs							25,500,000	1,800,000
Number Of Branch Locations Excluded From Operating Results										11
Percentage of loss shared by FDIC												80.00%		80.00%
FDIC Percentage Of Loss Recoveries												80.00%		80.00%
Business Acquisition, Purchase Price Allocation, FDIC Indemnification Asset											38,531,000		30,203,000		38,100,000	27,200,000
Business Combination, Purchase Price Allocation, Other Assets						75,820,000			2,447,000		3,657,000		1,813,000		1,700,000	786,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Acquired Loans	(369,000)	(1,700,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Loans Covered By Loss Sharing	(61,000)	(509,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, FDIC Indemnification Asset	427,000	3,000,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets	1,900,000	1,000,000
Business Acquisition, Purchase Price Allocation, Liabilities, Deposits						1,883,407,000			401,127,000		159,525,000		123,279,000
Business Acquisition, Purchase Price Allocation, Federal Home Loan Bank Advances						$ 128,885,000			$ 32,949,000		$ 5,003,000		$ 7,772,000