Loans, Allowance for Loan Losses and Credit Quality (Details 10) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Impaired loans by loan portfolio
Related Allowance	$ 5,281	$ 3,420
Impaired Financing Receivable, Recorded Investment, Total	72,967	66,659
Impaired Financing Receivable, Unpaid Principal Balance	76,010	70,649
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	30,027	27,297
Unpaid Principal Balance	31,919	29,689
Related Allowance
WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	42,940	39,362
Unpaid Principal Balance	44,091	40,960
Related Allowance	5,281	3,420
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	7,512	5,849
Unpaid Principal Balance	7,815	7,343
Related Allowance
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	2,134	2,726
Unpaid Principal Balance	2,154	2,851
Related Allowance	1,174	1,084
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	14,872	12,999
Unpaid Principal Balance	15,674	13,698
Related Allowance
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	24,933	20,869
Unpaid Principal Balance	25,007	21,438
Related Allowance	2,150	516
Commercial Construction [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	100
Unpaid Principal Balance	408
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	1,446	1,085
Unpaid Principal Balance	1,611	1,147
Related Allowance
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	616	1,194
Unpaid Principal Balance	644	1,228
Related Allowance	111	353
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	2,053	2,545
Unpaid Principal Balance	2,311	2,630
Related Allowance
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	13,733	12,828
Unpaid Principal Balance	14,678	13,601
Related Allowance	1,651	1,302
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	3,559	4,119
Unpaid Principal Balance	3,614	4,166
Related Allowance
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	572	316
Unpaid Principal Balance	637	389
Related Allowance	112	35
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	485	700
Unpaid Principal Balance	486	705
Related Allowance
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Impaired loans by loan portfolio
Recorded Investment	952	1,429
Unpaid Principal Balance	971	1,453
Related Allowance	$ 83	$ 130