Allowance for Loan Losses Troubled Debt Restructuring on Financing Receivables (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income	$ 700,000		$ 600,000		$ 2,000,000		$ 2,400,000
Financing Receivable, Modifications, Recorded Investment	135,408,000		136,505,000		135,408,000		136,505,000		133,187,000
Financing Receiables, Modifications, Unpaid Principal Balance	178,848,000		185,435,000		178,848,000		185,435,000		184,293,000
financing receivables, modifications, number of contracts at period end	2,504		2,732		2,504		2,732		2,624
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,853,000	[1]	6,998,000	[1]	2,853,000	[1]	6,998,000	[1]	5,559,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	11,655,000	[1]	11,916,000	[1]	11,655,000	[1]	11,916,000	[1]	9,996,000	[1]
financing receivables, modifications, number of contracts at period end	46		40		46		40		40
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	56,327,000	[1]	58,532,000	[1]	56,327,000	[1]	58,532,000	[1]	57,657,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	76,308,000	[1]	78,100,000	[1]	76,308,000	[1]	78,100,000	[1]	79,307,000	[1]
financing receivables, modifications, number of contracts at period end	89		73		89		73		77
Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	650,000	[1]	4,998,000	[1]	650,000	[1]	4,998,000	[1]	5,049,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	10,899,000	[1]	25,033,000	[1]	10,899,000	[1]	25,033,000	[1]	25,726,000	[1]
financing receivables, modifications, number of contracts at period end	41		41		41		41		40
Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	59,830,000	[1]	70,528,000	[1]	59,830,000	[1]	70,528,000	[1]	68,265,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	98,862,000	[1]	115,049,000	[1]	98,862,000	[1]	115,049,000	[1]	115,029,000	[1]
financing receivables, modifications, number of contracts at period end	176		154		176		154		157
Installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,535,000	[1]	28,578,000	[1]	24,535,000	[1]	28,578,000	[1]	27,790,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	25,336,000	[1]	29,960,000	[1]	25,336,000	[1]	29,960,000	[1]	29,078,000	[1]
financing receivables, modifications, number of contracts at period end	1,275		1,655		1,275		1,655		1,565
Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	22,077,000	[1]	12,929,000	[1]	22,077,000	[1]	12,929,000	[1]	12,371,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	22,373,000	[1]	13,339,000	[1]	22,373,000	[1]	13,339,000	[1]	12,745,000	[1]
financing receivables, modifications, number of contracts at period end	458		291		458		291		286
Consumer Credit Card
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	912,000	[1]	1,253,000		912,000	[1]	1,253,000		1,113,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	912,000	[1]	1,253,000		912,000	[1]	1,253,000		1,113,000	[1]
financing receivables, modifications, number of contracts at period end	244		339		244		339		307
Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,054,000	[1]	23,217,000	[1]	28,054,000	[1]	23,217,000	[1]	23,648,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	31,365,000	[1]	25,834,000	[1]	31,365,000	[1]	25,834,000	[1]	26,328,000	[1]
financing receivables, modifications, number of contracts at period end	351		293		351		293		309
Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	75,578,000	[1]	65,977,000	[1]	75,578,000	[1]	65,977,000	[1]	64,922,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	79,986,000	[1]	70,386,000	[1]	79,986,000	[1]	70,386,000	[1]	69,264,000	[1]
financing receivables, modifications, number of contracts at period end	2,328		2,578		2,328		2,578		2,467
Originated Loans Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,673,000	[1]	5,455,000	[1]	2,673,000	[1]	5,455,000	[1]	4,449,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	10,032,000	[1]	9,533,000	[1]	10,032,000	[1]	9,533,000	[1]	7,660,000	[1]
financing receivables, modifications, number of contracts at period end	39		35		39		35		35
Originated Loans Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	18,087,000	[1]	15,508,000	[1]	18,087,000	[1]	15,508,000	[1]	15,932,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	22,905,000	[1]	19,848,000	[1]	22,905,000	[1]	19,848,000	[1]	20,569,000	[1]
financing receivables, modifications, number of contracts at period end	63		49		63		49		52
Originated Loans Commercial | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	[1]	958,000	[1]	0	[1]	958,000	[1]	905,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	0	[1]	1,237,000	[1]	0	[1]	1,237,000	[1]	1,179,000	[1]
financing receivables, modifications, number of contracts at period end	31		31		31		31		30
Originated Loans Commercial | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	20,760,000	[1]	21,921,000	[1]	20,760,000	[1]	21,921,000	[1]	21,286,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	32,937,000	[1]	30,618,000	[1]	32,937,000	[1]	30,618,000	[1]	29,408,000	[1]
financing receivables, modifications, number of contracts at period end	133		115		133		115		117
Originated Consumer Loans | Installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	23,575,000	[1]	28,578,000	[1]	23,575,000	[1]	28,578,000	[1]	27,285,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	24,315,000	[1]	29,960,000	[1]	24,315,000	[1]	29,960,000	[1]	28,536,000	[1]
financing receivables, modifications, number of contracts at period end	1,238		1,655		1,238		1,655		1,553
Originated Consumer Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,624,000	[1]	6,916,000	[1]	7,624,000	[1]	6,916,000	[1]	6,725,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	7,874,000	[1]	7,255,000	[1]	7,874,000	[1]	7,255,000	[1]	7,054,000	[1]
financing receivables, modifications, number of contracts at period end	275		240		275		240		231
Originated Consumer Loans | Consumer Credit Card
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	912,000	[1]	1,253,000	[1]	912,000	[1]	1,253,000	[1]	1,113,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	912,000	[1]	1,253,000	[1]	912,000	[1]	1,253,000	[1]	1,113,000	[1]
financing receivables, modifications, number of contracts at period end	244		339		244		339		307
Originated Consumer Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,108,000	[1]	23,065,000	[1]	26,108,000	[1]	23,065,000	[1]	23,067,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	29,193,000	[1]	25,683,000	[1]	29,193,000	[1]	25,683,000	[1]	25,676,000	[1]
financing receivables, modifications, number of contracts at period end	325		292		325		292		301
Originated Consumer Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	58,219,000	[1]	59,812,000	[1]	58,219,000	[1]	59,812,000	[1]	58,190,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	62,294,000	[1]	64,151,000	[1]	62,294,000	[1]	64,151,000	[1]	62,379,000	[1]
financing receivables, modifications, number of contracts at period end	2,082		2,526		2,082		2,526		2,392
Originated Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	78,979,000	[1]	81,733,000	[1]	78,979,000	[1]	81,733,000	[1]	79,476,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	95,231,000	[1]	94,769,000	[1]	95,231,000	[1]	94,769,000	[1]	91,787,000	[1]
financing receivables, modifications, number of contracts at period end	2,215		2,641		2,215		2,641		2,509
Acquired Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,904,000	[1]	266,000	[1]	10,904,000	[1]	266,000	[1]	2,917,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	11,237,000	[1]	313,000	[1]	11,237,000	[1]	313,000	[1]	3,049,000	[1]
financing receivables, modifications, number of contracts at period end	185		4		185		4		29
Acquired Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,000		6,000		3,000		6,000		6,000
Financing Receiables, Modifications, Unpaid Principal Balance	3,000		6,000		3,000		6,000		5,000
financing receivables, modifications, number of contracts at period end	1		1		1		1		1
Acquired Loans | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,336,000	[1]			2,336,000	[1]			1,730,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	2,336,000	[1]			2,336,000	[1]			1,730,000	[1]
financing receivables, modifications, number of contracts at period end	2				2				1
Acquired Loans | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			6,000	[1]			6,000	[1]	1,736,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance			6,000	[1]			6,000	[1]	1,735,000	[1]
financing receivables, modifications, number of contracts at period end			1				1		2
Acquired Loans | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	2,339,000		6,000		2,339,000		6,000		1,736,000
Financing Receiables, Modifications, Unpaid Principal Balance	2,339,000				2,339,000
financing receivables, modifications, number of contracts at period end	3				3
Acquired Loans | installment
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	960,000				960,000				505,000
Financing Receiables, Modifications, Unpaid Principal Balance	1,021,000				1,021,000				542,000
financing receivables, modifications, number of contracts at period end	37				37				12
Acquired Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,995,000	[1]	260,000	[1]	5,995,000	[1]	260,000	[1]	245,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	6,041,000	[1]	307,000	[1]	6,041,000	[1]	307,000	[1]	270,000	[1]
financing receivables, modifications, number of contracts at period end	121		3		121		3		8
Acquired Loans | Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,610,000				1,610,000
Financing Receiables, Modifications, Unpaid Principal Balance	1,836,000				1,836,000
financing receivables, modifications, number of contracts at period end	24				24
Acquired Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment									431,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance									502,000	[1]
financing receivables, modifications, number of contracts at period end									7
Acquired Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,565,000	[1]	260,000		8,565,000	[1]	260,000		1,181,000
Financing Receiables, Modifications, Unpaid Principal Balance	8,898,000	[1]	307,000		8,898,000	[1]	307,000		1,314,000
financing receivables, modifications, number of contracts at period end	182		3		182		3		27
Covered Loans Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	177,000	[1]	1,537,000	[1]	177,000	[1]	1,537,000	[1]	1,104,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	1,620,000	[1]	2,377,000	[1]	1,620,000	[1]	2,377,000	[1]	2,331,000	[1]
financing receivables, modifications, number of contracts at period end	6		4		6		4		4
Covered Loans Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,904,000	[1]	43,024,000	[1]	35,904,000	[1]	43,024,000	[1]	39,995,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	51,067,000	[1]	58,252,000	[1]	51,067,000	[1]	58,252,000	[1]	57,008,000	[1]
financing receivables, modifications, number of contracts at period end	24		24		24		24		24
Covered Loans Commercial | Commercial Real Estate Construction Financing Receivable
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	650,000	[1]	4,040,000	[1]	650,000	[1]	4,040,000	[1]	4,144,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	10,899,000	[1]	23,796,000	[1]	10,899,000	[1]	23,796,000	[1]	24,547,000	[1]
financing receivables, modifications, number of contracts at period end	10		10		10		10		10
Covered Loans Commercial | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	36,731,000	[1]	48,601,000	[1]	36,731,000	[1]	48,601,000	[1]	45,243,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	63,586,000	[1]	84,425,000	[1]	63,586,000	[1]	84,425,000	[1]	83,886,000	[1]
financing receivables, modifications, number of contracts at period end	40		38		40		38		38
Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,794,000		5,905,000		8,794,000		5,905,000		5,551,000
Covered Consumer Loans | Home Equity Line of Credit
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,458,000	[1]	5,753,000	[1]	8,458,000	[1]	5,753,000	[1]	5,401,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	8,458,000	[1]	5,777,000	[1]	8,458,000	[1]	5,777,000	[1]	5,421,000	[1]
financing receivables, modifications, number of contracts at period end	62		48		62		48		47
Covered Consumer Loans | Residential Mortgages
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	336,000	[1]	152,000		336,000	[1]	152,000		150,000
Financing Receiables, Modifications, Unpaid Principal Balance	336,000	[1]			336,000	[1]
financing receivables, modifications, number of contracts at period end	2				2
Covered Consumer Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			5,905,000				5,905,000
Financing Receiables, Modifications, Unpaid Principal Balance			5,928,000				5,928,000
financing receivables, modifications, number of contracts at period end			49				49
Covered TDR Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	45,525,000	[1]	54,506,000	[1]	45,525,000	[1]	54,506,000	[1]	50,794,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	72,380,000	[1]	90,353,000	[1]	72,380,000	[1]	90,353,000	[1]	89,457,000	[1]
financing receivables, modifications, number of contracts at period end	104		87		104		87		86
Covered TDR Loans | Total commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			48,601,000				48,601,000
Covered TDR Loans | Residential Real Estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment			152,000				152,000		150,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance			151,000				151,000		150,000	[1]
financing receivables, modifications, number of contracts at period end			1				1		1
Covered TDR Loans | Total consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,794,000	[1]			8,794,000	[1]			5,551,000	[1]
Financing Receiables, Modifications, Unpaid Principal Balance	$ 8,794,000	[1]			$ 8,794,000	[1]			$ 5,571,000	[1]
financing receivables, modifications, number of contracts at period end	64				64				48

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