Allowance for Loan Losses Troubled Debt Restructuring on Financing Receivables (Details) (USD $) In Thousands, unless otherwise specified																																																																																																																																																	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 Commercial		Dec. 31, 2013 Commercial		Jun. 30, 2013 Commercial		Jun. 30, 2014 Commercial Real Estate		Dec. 31, 2013 Commercial Real Estate		Jun. 30, 2013 Commercial Real Estate		Jun. 30, 2014 Commercial Real Estate Construction Financing Receivable		Dec. 31, 2013 Commercial Real Estate Construction Financing Receivable		Jun. 30, 2013 Commercial Real Estate Construction Financing Receivable		Jun. 30, 2014 Total commercial		Dec. 31, 2013 Total commercial		Jun. 30, 2013 Total commercial		Jun. 30, 2014 Installment		Dec. 31, 2013 Installment		Jun. 30, 2013 Installment		Jun. 30, 2014 Home Equity Line of Credit		Dec. 31, 2013 Home Equity Line of Credit		Jun. 30, 2013 Home Equity Line of Credit		Jun. 30, 2014 Consumer Credit Card		Dec. 31, 2013 Consumer Credit Card		Jun. 30, 2013 Consumer Credit Card	Jun. 30, 2014 Residential Mortgages		Dec. 31, 2013 Residential Mortgages		Jun. 30, 2013 Residential Mortgages		Jun. 30, 2014 Total consumer		Dec. 31, 2013 Total consumer		Jun. 30, 2013 Total consumer		Jun. 30, 2014 Originated Loans Commercial Commercial		Dec. 31, 2013 Originated Loans Commercial Commercial		Jun. 30, 2013 Originated Loans Commercial Commercial		Jun. 30, 2014 Originated Loans Commercial Commercial Real Estate		Dec. 31, 2013 Originated Loans Commercial Commercial Real Estate		Jun. 30, 2013 Originated Loans Commercial Commercial Real Estate		Jun. 30, 2014 Originated Loans Commercial Commercial Real Estate Construction Financing Receivable		Dec. 31, 2013 Originated Loans Commercial Commercial Real Estate Construction Financing Receivable		Jun. 30, 2013 Originated Loans Commercial Commercial Real Estate Construction Financing Receivable		Jun. 30, 2014 Originated Loans Commercial Total commercial		Dec. 31, 2013 Originated Loans Commercial Total commercial		Jun. 30, 2013 Originated Loans Commercial Total commercial		Jun. 30, 2014 Originated Consumer Loans Installment		Dec. 31, 2013 Originated Consumer Loans Installment		Jun. 30, 2013 Originated Consumer Loans Installment		Jun. 30, 2014 Originated Consumer Loans Home Equity Line of Credit		Dec. 31, 2013 Originated Consumer Loans Home Equity Line of Credit		Jun. 30, 2013 Originated Consumer Loans Home Equity Line of Credit		Jun. 30, 2014 Originated Consumer Loans Consumer Credit Card		Dec. 31, 2013 Originated Consumer Loans Consumer Credit Card		Jun. 30, 2013 Originated Consumer Loans Consumer Credit Card		Jun. 30, 2014 Originated Consumer Loans Residential Mortgages		Dec. 31, 2013 Originated Consumer Loans Residential Mortgages		Jun. 30, 2013 Originated Consumer Loans Residential Mortgages		Jun. 30, 2014 Originated Consumer Loans Total consumer		Dec. 31, 2013 Originated Consumer Loans Total consumer		Jun. 30, 2013 Originated Consumer Loans Total consumer		Jun. 30, 2014 Originated Loans		Dec. 31, 2013 Originated Loans		Jun. 30, 2013 Originated Loans		Jun. 30, 2014 Acquired Loans		Dec. 31, 2013 Acquired Loans		Jun. 30, 2014 Acquired Loans Commercial	Dec. 31, 2013 Acquired Loans Commercial	Jun. 30, 2014 Acquired Loans Commercial Real Estate	Dec. 31, 2013 Acquired Loans Commercial Real Estate	Jun. 30, 2014 Acquired Loans Total commercial	Dec. 31, 2013 Acquired Loans Total commercial	Jun. 30, 2014 Acquired Loans installment	Dec. 31, 2013 Acquired Loans installment	Jun. 30, 2014 Acquired Loans Home Equity Line of Credit		Dec. 31, 2013 Acquired Loans Home Equity Line of Credit		Jun. 30, 2014 Acquired Loans Mortgages	Dec. 31, 2013 Acquired Loans Residential Mortgages		Jun. 30, 2014 Acquired Loans Total consumer		Dec. 31, 2013 Acquired Loans Total consumer	Dec. 31, 2013 Acquired loan type [Domain]		Jun. 30, 2014 Acquired loan type [Domain] Commercial Real Estate		Dec. 31, 2013 Acquired loan type [Domain] Commercial Real Estate		Jun. 30, 2014 Covered Loans	Jun. 30, 2013 Covered Loans	Jun. 30, 2014 Covered Loans	Jun. 30, 2013 Covered Loans	Jun. 30, 2014 Covered Loans Commercial Commercial		Dec. 31, 2013 Covered Loans Commercial Commercial		Jun. 30, 2013 Covered Loans Commercial Commercial		Jun. 30, 2014 Covered Loans Commercial Commercial Real Estate		Dec. 31, 2013 Covered Loans Commercial Commercial Real Estate		Jun. 30, 2013 Covered Loans Commercial Commercial Real Estate		Jun. 30, 2014 Covered Loans Commercial Commercial Real Estate Construction Financing Receivable		Dec. 31, 2013 Covered Loans Commercial Commercial Real Estate Construction Financing Receivable		Jun. 30, 2013 Covered Loans Commercial Commercial Real Estate Construction Financing Receivable		Jun. 30, 2014 Covered Loans Commercial Total commercial		Dec. 31, 2013 Covered Loans Commercial Total commercial		Jun. 30, 2013 Covered Loans Commercial Total commercial		Jun. 30, 2014 Covered Loans Commercial Total consumer		Jun. 30, 2014 Covered Consumer Loans	Dec. 31, 2013 Covered Consumer Loans	Jun. 30, 2014 Covered Consumer Loans Home Equity Line of Credit		Dec. 31, 2013 Covered Consumer Loans Home Equity Line of Credit		Jun. 30, 2014 Covered Consumer Loans Residential Mortgages		Dec. 31, 2013 Covered Consumer Loans Residential Mortgages	Jun. 30, 2013 Covered Consumer Loans Total consumer	Jun. 30, 2014 Covered TDR Loans		Dec. 31, 2013 Covered TDR Loans		Jun. 30, 2013 Covered TDR Loans		Jun. 30, 2013 Covered TDR Loans Total commercial	Dec. 31, 2013 Covered TDR Loans Residential Real Estate		Dec. 31, 2013 Covered TDR Loans Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 144,956	$ 133,187	$ 147,207	$ 7,243	[1]	$ 5,559	[1]	$ 9,441	[1]	$ 60,453	[1]	$ 57,657	[1]	$ 63,675	[1]	$ 2,658	[1]	$ 5,049	[1]	$ 7,087	[1]	$ 70,354	[1]	$ 68,265	[1]	$ 80,203	[1]	$ 25,373	[1]	$ 27,790	[1]	$ 30,140	[1]	$ 20,155	[1]	$ 12,371	[1]	$ 12,381	[1]	$ 979	[1]	$ 1,113	[1]	$ 1,262	$ 28,095	[1]	$ 23,648	[1]	$ 23,221	[1]	$ 74,602	[1]	$ 64,922	[1]	$ 67,004	[1]	$ 7,062	[1]	$ 4,449	[1]	$ 7,806	[1]	$ 21,407	[1]	$ 15,932	[1]	$ 17,361	[1]	$ 53	[1]	$ 905	[1]	$ 1,005	[1]	$ 28,522	[1]	$ 21,286	[1]	$ 26,172	[1]	$ 24,394	[1]	$ 27,285	[1]	$ 30,140	[1]	$ 6,956	[1]	$ 6,725	[1]	$ 6,819	[1]	$ 979	[1]	$ 1,113	[1]	$ 1,262	[1]	$ 26,297	[1]	$ 23,067	[1]	$ 23,221	[1]	$ 58,626	[1]	$ 58,190	[1]	$ 61,442	[1]	$ 87,148	[1]	$ 79,476	[1]	$ 87,614	[1]	$ 8,815	[1]	$ 2,917	[1]	$ 4	$ 6	$ 1,661	$ 1,730	$ 1,665	$ 1,736	$ 979	$ 505	$ 4,710	[1]	$ 245	[1]	$ 1,461	$ 431	[1]	$ 7,150	[1]	$ 1,181	$ 1,736	[1]	$ 1,661	[1]	$ 1,730	[1]					$ 177	[1]	$ 1,104	[1]	$ 1,635	[1]	$ 37,385	[1]	$ 39,995	[1]	$ 46,314	[1]	$ 2,605	[1]	$ 4,144	[1]	$ 6,082	[1]	$ 40,167	[1]	$ 45,243	[1]	$ 54,031	[1]	$ 8,826	[1]	$ 48,993	$ 5,551	$ 8,489	[1]	$ 5,401	[1]	$ 337	[1]	$ 150	$ 5,562	$ 48,993	[1]	$ 50,794	[1]	$ 59,593	[1]	$ 54,031	$ 150	[1]	$ 5,551	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	196,522	184,293	191,122	14,274	[1]	9,996	[1]	13,369	[1]	81,708	[1]	79,307	[1]	78,763	[1]	21,407	[1]	25,726	[1]	27,437	[1]	117,389	[1]	115,029	[1]	119,569	[1]	26,325	[1]	29,078	[1]	31,654	[1]	20,431	[1]	12,745	[1]	12,732	[1]	979	[1]	1,113	[1]	1,262	31,398	[1]	26,328	[1]	25,905	[1]	79,133	[1]	69,264	[1]	71,553	[1]	13,200	[1]	7,660	[1]	11,489	[1]	25,567	[1]	20,569	[1]	21,742	[1]	76	[1]	1,179	[1]	1,282	[1]	38,843	[1]	29,408	[1]	34,513	[1]	25,293	[1]	28,536	[1]	31,654	[1]	7,192	[1]	7,054	[1]	7,142	[1]	979	[1]	1,113	[1]	1,262	[1]	29,426	[1]	25,676	[1]	25,905	[1]	62,890	[1]	62,379	[1]	65,963	[1]	101,733	[1]	91,787	[1]	100,476	[1]	9,082	[1]	3,049	[1]	4	5			1,665		1,032	542	4,750	[1]	270	[1]	1,635	502	[1]	7,417	[1]	1,314	1,735	[1]	1,661	[1]	1,730	[1]					1,070	[1]	2,331	[1]	1,880	[1]	54,480	[1]	57,008	[1]	57,021	[1]	21,331	[1]	24,547	[1]	26,155	[1]	76,881	[1]	83,886	[1]	85,056	[1]	8,826	[1]			8,489	[1]	5,421	[1]	337	[1]		5,590	85,707	[1]	89,457	[1]	90,646	[1]		150	[1]	5,571	[1]
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements																																																																																																																																																	$ (451)	$ 6,477	$ 7,428	$ 16,154
financing receivables, modifications, number of contracts at period end	2,568	2,624	2,803	48		40		34		85		77		68		41		40		41		174		157		143		1,380		1,565		1,757		412		286		281		253		307		329	349		309		293		2,394		2,467		2,660		41		35		31		60		52		47		31		30		31		132		117		109		1,350		1,553		1,757		260		231		239		253		307		329		326		301		293		2,189		2,392		2,618		2,321		2,509		2,727		143		29		1	1			2		30	12	90		8		21	7		141		27	2		1		1						6		4		3		24		24		21		10		10		10		40		38		34		64				62		47		2			42	104		86		76			1		48

[1] Note 1: The differences between the recorded investment and unpaid principal balance amounts represents partial charge offs.