Loans, Allowance for Loan Losses and Credit Quality (ALLL - by category) (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
Summary of changes in allowance for loan losses
Beginning Balance	$ 53,629	$ 51,906	$ 53,239	$ 51,834
Charge-offs	(2,150)	(2,477)	(6,716)	(4,051)
Recoveries	809	447	1,263	793
Provision for loan losses	2,250	3,100	6,752	4,400
Ending Balance	54,538	52,976	54,538	52,976
Ending Balance: Individually Evaluated for Impairment	2,730	3,152	2,730	3,152
Ending Balance: Collectively Evaluated for Impairment	51,808	49,824	51,808	49,824
Commercial and Industrial [Member]
Summary of changes in allowance for loan losses
Beginning Balance	15,601	13,443	15,622	13,461
Charge-offs	(470)	(1,302)	(1,253)	(1,725)
Recoveries	128	103	207	239
Provision for loan losses	670	2,081	1,353	2,350
Ending Balance	15,929	14,325	15,929	14,325
Ending Balance: Individually Evaluated for Impairment	472	775	472	775
Ending Balance: Collectively Evaluated for Impairment	15,457	13,550	15,457	13,550
Commercial Real Estate [Member]
Summary of changes in allowance for loan losses
Beginning Balance	24,917	22,569	24,541	22,598
Charge-offs	(660)	(196)	(3,582)	(603)
Recoveries	197	8	265	8
Provision for loan losses	641	648	3,871	1,026
Ending Balance	25,095	23,029	25,095	23,029
Ending Balance: Individually Evaluated for Impairment	292	410	292	410
Ending Balance: Collectively Evaluated for Impairment	24,803	22,619	24,803	22,619
Commercial Construction [Member]
Summary of changes in allowance for loan losses
Beginning Balance	3,570	3,139	3,371	2,811
Charge-offs
Recoveries
Provision for loan losses	187	283	386	611
Ending Balance	3,757	3,422	3,757	3,422
Ending Balance: Individually Evaluated for Impairment	0	0	0	0
Ending Balance: Collectively Evaluated for Impairment	3,757	3,422	3,757	3,422
Small Business [Member]
Summary of changes in allowance for loan losses
Beginning Balance	1,207	1,244	1,215	1,524
Charge-offs	(128)	(276)	(396)	(421)
Recoveries	92	37	139	76
Provision for loan losses	(17)	290	196	116
Ending Balance	1,154	1,295	1,154	1,295
Ending Balance: Individually Evaluated for Impairment	45	153	45	153
Ending Balance: Collectively Evaluated for Impairment	1,109	1,142	1,109	1,142
Residential Real Estate [Member]
Summary of changes in allowance for loan losses
Beginning Balance	2,829	3,048	2,760	2,930
Charge-offs	(326)	(186)	(454)	(247)
Recoveries	190	86	190	86
Provision for loan losses	186	11	383	190
Ending Balance	2,879	2,959	2,879	2,959
Ending Balance: Individually Evaluated for Impairment	1,599	1,670	1,599	1,670
Ending Balance: Collectively Evaluated for Impairment	1,280	1,289	1,280	1,289
Consumer Home Equity [Member]
Summary of changes in allowance for loan losses
Beginning Balance	4,758	7,716	5,036	7,703
Charge-offs	(308)	(257)	(402)	(534)
Recoveries	55	30	148	51
Provision for loan losses	464	(222)	187	47
Ending Balance	4,969	7,267	4,969	7,267
Ending Balance: Individually Evaluated for Impairment	273	52	273	52
Ending Balance: Collectively Evaluated for Impairment	4,696	7,215	4,696	7,215
Consumer Other [Member]
Summary of changes in allowance for loan losses
Beginning Balance	747	747	694	807
Charge-offs	(258)	(260)	(629)	(521)
Recoveries	147	183	314	333
Provision for loan losses	119	9	376	60
Ending Balance	755	679	755	679
Ending Balance: Individually Evaluated for Impairment	49	92	49	92
Ending Balance: Collectively Evaluated for Impairment	$ 706	$ 587	$ 706	$ 587