Loans, Allowance for Loan Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 104,603	$ 123,985
Nonaccrual Restructured Loans	63,314	59,585
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	36,956	32,517
Nonaccrual Restructured Loans	4,759	6,900
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	11,574	13,009
Nonaccrual Restructured Loans	8,031	10,999
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	24,439	44,946
Nonaccrual Restructured Loans	17,472	18,069
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	805	3,793
Nonaccrual Restructured Loans	2,833	2,065
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	10,582	9,633
Nonaccrual Restructured Loans	6,729	5,419
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,106	246
Nonaccrual Restructured Loans	230	451
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	19,141	19,841
Nonaccrual Restructured Loans	$ 23,260	$ 15,682