Loans, Allowance for Loan Losses and Credit Quality (Int Inc. Recognized on Impaired Loans by Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income recognized on impaired loans
Average Recorded Investment	$ 61,942	$ 73,494	$ 62,952	$ 74,346
Interest Income Recognized	804	999	1,614	2,005
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	28,925	36,259	29,457	36,875
Interest Income Recognized	403	539	811	1,082
WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	33,017	37,235	33,495	37,471
Interest Income Recognized	401	460	803	923
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,449	8,396	4,774	8,836
Interest Income Recognized	60	114	123	230
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	2,808	3,076	2,906	3,221
Interest Income Recognized	40	43	81	89
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	16,216	18,392	16,342	18,448
Interest Income Recognized	246	312	490	628
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	14,523	18,242	14,748	18,235
Interest Income Recognized	205	263	413	526
Commercial Construction [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment		1,608		1,608
Interest Income Recognized		13		26
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	1,051	1,393	1,076	1,454
Interest Income Recognized	16	22	32	46
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	449	748	462	760
Interest Income Recognized	8	12	16	23
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	2,415	2,236	2,426	2,253
Interest Income Recognized	24	25	50	44
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	13,449	13,688	13,563	13,732
Interest Income Recognized	132	127	264	255
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,431	3,674	4,465	3,691
Interest Income Recognized	51	43	103	85
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	1,102	407	1,109	410
Interest Income Recognized	10	5	17	10
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	363	560	374	585
Interest Income Recognized	6	10	13	23
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	686	1,074	707	1,113
Interest Income Recognized	$ 6	$ 10	$ 12	$ 20