Loans, Allowance for Loan Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 123,985	$ 121,087
Nonaccrual Restructured Loans	59,585	80,590
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	32,517	28,140
Nonaccrual Restructured Loans	6,900	12,496
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	13,009	13,852
Nonaccrual Restructured Loans	10,999	11,514
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	44,946	41,660
Nonaccrual Restructured Loans	18,069	25,221
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	3,793	4,530
Nonaccrual Restructured Loans	2,065	6,798
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	9,633	9,968
Nonaccrual Restructured Loans	5,419	6,698
Installment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	246	653
Nonaccrual Restructured Loans	451	674
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	19,841	22,284
Nonaccrual Restructured Loans	$ 15,682	$ 17,189