Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 77,178	$ 79,857
Nonaccrual Restructured Loans	33,520	29,385
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	32,572	31,884
Nonaccrual Restructured Loans	7,994	1,276
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	4,077	5,490
Nonaccrual Restructured Loans	2,145	2,220
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	14,294	15,289
Nonaccrual Restructured Loans	589	924
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	316	359
Nonaccrual Restructured Loans	160	150
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	16,859	18,100
Nonaccrual Restructured Loans	20,248	21,906
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,987	7,756
Nonaccrual Restructured Loans	2,364	2,877
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,073	979
Nonaccrual Restructured Loans	$ 20	$ 32