Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 79,059	$ 79,857
Nonaccrual Restructured Loans	78,902	29,385
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	30,852	31,884
Nonaccrual Restructured Loans	52,079	1,276
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	5,532	5,490
Nonaccrual Restructured Loans	2,148	2,220
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	14,563	15,289
Nonaccrual Restructured Loans	1,643	924
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	327	359
Nonaccrual Restructured Loans	170	150
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,535	18,100
Nonaccrual Restructured Loans	20,457	21,906
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	8,209	7,756
Nonaccrual Restructured Loans	2,379	2,877
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,041	979
Nonaccrual Restructured Loans	$ 26	$ 32