Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	$ 26,891	$ 26,041
Nonaccrual Restructured Loans(a)	23,844	22,494
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	16,002	16,678
Nonaccrual Restructured Loans(a)	7,827	7,376
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,389	1,676
Nonaccrual Restructured Loans(a)	168	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	635	293
Nonaccrual Restructured Loans(a)	0	0
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	382	298
Nonaccrual Restructured Loans(a)	98	179
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	5,378	3,955
Nonaccrual Restructured Loans(a)	14,535	13,035
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,889	1,896
Nonaccrual Restructured Loans(a)	1,216	1,904
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,218	1,246
Nonaccrual Restructured Loans(a)	$ 0	$ 1