Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 87,363	$ 98,216	$ 123,985
Nonaccrual Restructured Loans	37,684	57,656	59,585
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	29,293	33,892	32,517
Nonaccrual Restructured Loans	1,714	3,260	6,900
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,877	10,454	13,009
Nonaccrual Restructured Loans	2,703	5,656	10,999
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	21,915	23,127	44,946
Nonaccrual Restructured Loans	3,936	15,216	18,069
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	510	727	3,793
Nonaccrual Restructured Loans	177	2,438	2,065
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,069	8,209	8,197
Nonaccrual Restructured Loans	4,522	4,838	4,441
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	829	974	246
Nonaccrual Restructured Loans	40	199	451
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	19,870	20,833	21,277
Nonaccrual Restructured Loans	$ 24,592	$ 26,049	$ 16,660