Loans, Allowance for Loan Losses, and Credit Quality Troubled Debt Restructurings Subsequent Default (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
Financing Receivable, Modifications [Line Items]
Number of Loans	32	24	84	56
Recorded Investment	$ 2,372	$ 2,790	$ 7,744	$ 7,438
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	8	1	18
Recorded Investment	0	506	52	1,626
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	2	2	4
Recorded Investment	0	464	203	578
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	2	5
Recorded Investment	493	405	1,613	1,992
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1	1	2
Recorded Investment	0	118	160	158
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	12	4	25	12
Recorded Investment	367	147	939	699
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0	3	0
Recorded Investment	10	0	34	0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	18	8	50	15
Recorded Investment	$ 1,502	$ 1,150	$ 4,743	$ 2,385