Loans, Allowance for Loan Losses, and Credit Quality Troubled Debt Restructurings Subsequent Default (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of Loans	21	17
Recorded Investment	$ 2,320	$ 3,758
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	7
Recorded Investment	0	1,170
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Recorded Investment	0	74
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	3
Recorded Investment	0	1,781
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0
Recorded Investment	161	0
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	7	3
Recorded Investment	388	109
Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0
Recorded Investment	10	0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	12	3
Recorded Investment	$ 1,761	$ 624