Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 63,723	$ 74,618
Nonaccrual Restructured Loans	38,005	23,486
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	32,438	30,047
Nonaccrual Restructured Loans	155	1,776
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	3,820	3,989
Nonaccrual Restructured Loans	0	0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	372	14,389
Nonaccrual Restructured Loans	14,268	0
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	222	310
Nonaccrual Restructured Loans	226	157
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	17,934	17,068
Nonaccrual Restructured Loans	20,372	18,991
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,900	7,705
Nonaccrual Restructured Loans	2,972	2,537
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,037	1,110
Nonaccrual Restructured Loans	$ 12	$ 25