Loans, Allowance for Loan Losses and Credit Quality (Details 10) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Impaired loans by loan portfolio
Related Allowance	$ 3,152	$ 3,420
Impaired Financing Receivable, Recorded Investment, Total	71,381	66,659
Impaired Financing Receivable, Unpaid Principal Balance	76,044	70,649
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	34,363	27,297
Unpaid Principal Balance	37,157	29,689
Related Allowance
WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	37,018	39,362
Unpaid Principal Balance	38,887	40,960
Related Allowance	3,152	3,420
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	6,780	5,849
Unpaid Principal Balance	8,577	7,343
Related Allowance
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	2,979	2,726
Unpaid Principal Balance	3,751	2,851
Related Allowance	775	1,084
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	18,252	12,999
Unpaid Principal Balance	18,928	13,698
Related Allowance
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	18,187	20,869
Unpaid Principal Balance	18,330	21,438
Related Allowance	410	516
Commercial Construction [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	1,608
Unpaid Principal Balance	1,608
Related Allowance
Commercial Construction [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment
Unpaid Principal Balance
Related Allowance
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	1,297	1,085
Unpaid Principal Balance	1,455	1,147
Related Allowance
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	742	1,194
Unpaid Principal Balance	778	1,228
Related Allowance	153	353
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	2,221	2,545
Unpaid Principal Balance	2,330	2,630
Related Allowance
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	13,662	12,828
Unpaid Principal Balance	14,502	13,601
Related Allowance	1,670	1,302
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	3,664	4,119
Unpaid Principal Balance	3,717	4,166
Related Allowance
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	405	316
Unpaid Principal Balance	457	389
Related Allowance	52	35
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	541	700
Unpaid Principal Balance	542	705
Related Allowance
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	1,043	1,429
Unpaid Principal Balance	1,069	1,453
Related Allowance	$ 92	$ 130