Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 46,548	$ 53,263
Nonaccrual Restructured Loans	24,172	26,292
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	15,443	25,478
Nonaccrual Restructured Loans	107	249
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	2,026	2,080
Nonaccrual Restructured Loans	78	0
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,700	799
Nonaccrual Restructured Loans	0	933
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	311	311
Nonaccrual Restructured Loans	187	198
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,226	16,036
Nonaccrual Restructured Loans	21,549	22,279
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,688	7,385
Nonaccrual Restructured Loans	2,247	2,627
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,154	1,174
Nonaccrual Restructured Loans	$ 5	$ 6