Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	$ 61,503	$ 62,759
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	63,406	70,261
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	11,949	15,534
Loans with a Specific Valuation Allowance, Average Balance	59,823	76,656
Loans without a Specific Valuation Allowance, Recorded Balance	138,177	138,976
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	169,082	149,412
Loans without a Specific Valuation Allowance, Average Balance	139,129	162,505
Recorded balance	199,680	201,735
Unpaid principal balance	232,488	219,673
Specific valuation allowance	11,949	15,534
Average balance	198,952	239,161
Residential Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	7,233	7,334
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	7,394	7,459
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	990	1,680
Loans with a Specific Valuation Allowance, Average Balance	7,237	12,797
Loans without a Specific Valuation Allowance, Recorded Balance	16,837	18,528
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	18,033	19,613
Loans without a Specific Valuation Allowance, Average Balance	18,103	16,034
Recorded balance	24,070	25,862
Unpaid principal balance	25,427	27,072
Specific valuation allowance	990	1,680
Average balance	25,340	28,831
Commercial Real Estate
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	23,917	29,595
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	25,331	36,887
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	3,763	7,716
Loans with a Specific Valuation Allowance, Average Balance	26,105	36,164
Loans without a Specific Valuation Allowance, Recorded Balance	95,609	95,687
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	119,017	102,798
Loans without a Specific Valuation Allowance, Average Balance	95,808	111,554
Recorded balance	119,526	125,282
Unpaid principal balance	144,348	139,685
Specific valuation allowance	3,763	7,716
Average balance	121,913	147,718
Other Commercial
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	27,015	21,205
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	27,238	21,278
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	6,155	3,859
Loans with a Specific Valuation Allowance, Average Balance	22,460	22,665
Loans without a Specific Valuation Allowance, Recorded Balance	14,489	12,388
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	19,156	14,318
Loans without a Specific Valuation Allowance, Average Balance	14,106	19,733
Recorded balance	41,504	33,593
Unpaid principal balance	46,394	35,596
Specific valuation allowance	6,155	3,859
Average balance	36,566	42,398
Home Equity
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	886	1,354
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	949	1,362
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	265	870
Loans with a Specific Valuation Allowance, Average Balance	767	1,390
Loans without a Specific Valuation Allowance, Recorded Balance	8,153	9,720
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	9,631	9,965
Loans without a Specific Valuation Allowance, Average Balance	8,844	11,993
Recorded balance	9,039	11,074
Unpaid principal balance	10,580	11,327
Specific valuation allowance	265	870
Average balance	9,611	13,383
Other Consumer
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	2,452	3,271
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	2,494	3,275
Loans with a Specific Valuation Allowance, Specific Valuation Allowance	776	1,409
Loans with a Specific Valuation Allowance, Average Balance	3,254	3,640
Loans without a Specific Valuation Allowance, Recorded Balance	3,089	2,653
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	3,245	2,718
Loans without a Specific Valuation Allowance, Average Balance	2,268	3,191
Recorded balance	5,541	5,924
Unpaid principal balance	5,739	5,993
Specific valuation allowance	776	1,409
Average balance	$ 5,522	$ 6,831