Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		$ 45,481	$ 53,263
Nonaccrual Restructured Loans	[1]	24,332	26,292
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		16,850	25,478
Nonaccrual Restructured Loans	[1]	101	249
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		1,970	2,080
Nonaccrual Restructured Loans	[1]	0	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		315	799
Nonaccrual Restructured Loans	[1]	461	933
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		232	311
Nonaccrual Restructured Loans	[1]	185	198
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		17,645	16,036
Nonaccrual Restructured Loans	[1]	21,213	22,279
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		7,247	7,385
Nonaccrual Restructured Loans	[1]	2,369	2,627
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans		1,222	1,174
Nonaccrual Restructured Loans	[1]	$ 3	$ 6

[1] (a) Nonaccrual restructured loans have been included within nonaccrual loans.