Loans, Allowance for Loan Losses and Credit Quality (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	33		45		95	132
Pre-Modification Outstanding Recorded Investment	$ 3,337		$ 2,057		$ 11,365	$ 11,853
Post-Modification Outstanding Recorded Investment(1)	3,343	[1]	2,057	[1]	11,371	11,901
Commercial and Industrial [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	4		1		15	5
Pre-Modification Outstanding Recorded Investment	329		200		1,602	410
Post-Modification Outstanding Recorded Investment(1)	329	[1]	200	[1]	1,602	410
Commercial Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	5		2		13	8
Pre-Modification Outstanding Recorded Investment	1,624		872		6,274	6,151
Post-Modification Outstanding Recorded Investment(1)	1,624	[1]	872	[1]	6,274	6,151
Small Business [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	8		14		16	34
Pre-Modification Outstanding Recorded Investment	327		480		724	1,267
Post-Modification Outstanding Recorded Investment(1)	327	[1]	480	[1]	724	1,267
Residential Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	5		2		9	11
Pre-Modification Outstanding Recorded Investment	889		203		1,539	3,082
Post-Modification Outstanding Recorded Investment(1)	893	[1]	203	[1]	1,543	3,130
Consumer - Home Equity [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	3		0		12	3
Pre-Modification Outstanding Recorded Investment	111		0		767	127
Post-Modification Outstanding Recorded Investment(1)	113	[1]	0	[1]	769	127
Consumer - Other [Member]
TROUBLED DEBT RESTRUCTURINGS:
Number of Contracts	8		26		30	71
Pre-Modification Outstanding Recorded Investment	57		302		459	816
Post-Modification Outstanding Recorded Investment(1)	$ 57	[1]	$ 302	[1]	$ 459	$ 816

[1] The post-modification balances represent the balance of the loan on the date of modifications. These amounts may show an increase when modifications include a capitalization of interest.