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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income recognized on impaired loans
Average Recorded Investment	$ 66,057	$ 74,830	$ 67,865	$ 76,814
Interest Income Recognized	900	986	2,652	2,982
WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	29,655	31,541	30,715	32,840
Interest Income Recognized	446	466	1,293	1,407
WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	36,402	43,289	37,150	43,974
Interest Income Recognized	454	520	1,359	1,575
Commercial and Industrial [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,411	7,553	4,743	7,762
Interest Income Recognized	63	91	194	275
Commercial and Industrial [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	3,889	2,360	4,285	2,684
Interest Income Recognized	52	30	160	96
Commercial Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	16,517	15,175	17,098	15,638
Interest Income Recognized	263	262	787	788
Commercial Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	17,509	24,984	17,674	25,128
Interest Income Recognized	246	330	734	1,013
Commercial Construction [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment		1,105		1,441
Interest Income Recognized		13		39
Small Business [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	840	1,479	889	1,631
Interest Income Recognized	13	26	40	79
Small Business [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	427	624	452	652
Interest Income Recognized	7	10	23	30
Residential Real Estate [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	2,806	2,159	2,836	2,221
Interest Income Recognized	48	24	90	68
Residential Real Estate [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	12,841	13,773	12,959	13,884
Interest Income Recognized	132	135	395	391
Consumer - Home Equity [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	4,405	3,570	4,456	3,604
Interest Income Recognized	51	41	154	126
Consumer - Home Equity [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	1,111	575	1,124	585
Interest Income Recognized	12	6	30	18
Consumer - Other [Member] | WITH NO RELATED ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	365	500	382	543
Interest Income Recognized	5	9	18	32
Consumer - Other [Member] | WITH AN ALLOWANCE RECORDED: [Member]
Interest income recognized on impaired loans
Average Recorded Investment	625	973	656	1,041
Interest Income Recognized	$ 5	$ 9	$ 17	$ 27