Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 69,154	$ 74,618
Nonaccrual Restructured Loans	33,757	23,486
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	38,885	30,047
Nonaccrual Restructured Loans	142	1,776
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	3,746	3,989
Nonaccrual Restructured Loans	0	0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	350	14,389
Nonaccrual Restructured Loans	9,917	0
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	218	310
Nonaccrual Restructured Loans	222	157
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	16,986	17,068
Nonaccrual Restructured Loans	20,952	18,991
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,792	7,705
Nonaccrual Restructured Loans	2,515	2,537
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,177	1,110
Nonaccrual Restructured Loans	$ 9	$ 25