Loans, Allowance for Loan Losses, and Credit Quality (Details 10) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Financing Receivable, Modifications [Line Items]
Number of Contracts	29	70
Recorded Investment	$ 7,967	$ 18,958
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	6	19
Recorded Investment	847	2,103
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	4	8
Recorded Investment	572	2,734
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	4	12
Recorded Investment	3,678	8,487
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	6
Recorded Investment	432	2,079
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	8	12
Recorded Investment	1,829	2,065
Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	2
Recorded Investment	0	333
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	5	11
Recorded Investment	$ 609	$ 1,157