Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 77,325	$ 79,857
Nonaccrual Restructured Loans	51,715	29,385
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	31,540	31,884
Nonaccrual Restructured Loans	27,016	1,276
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	4,145	5,490
Nonaccrual Restructured Loans	2,145	2,220
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	14,628	15,289
Nonaccrual Restructured Loans	602	924
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	321	359
Nonaccrual Restructured Loans	164	150
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	17,624	18,100
Nonaccrual Restructured Loans	19,365	21,906
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,985	7,756
Nonaccrual Restructured Loans	2,401	2,877
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,082	979
Nonaccrual Restructured Loans	$ 22	$ 32