Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 52,092	$ 26,041	$ 53,263
Nonaccrual Restructured Loans	20,190	22,494	26,292
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	12,713	16,678	25,478
Nonaccrual Restructured Loans	6,967	7,376	249
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,711	1,676	2,080
Nonaccrual Restructured Loans	0	0	0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	26,435	293	799
Nonaccrual Restructured Loans	225	0	933
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	260	298	311
Nonaccrual Restructured Loans	111	179	198
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,825	3,955	16,036
Nonaccrual Restructured Loans	11,509	13,035	22,279
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,957	1,896	7,385
Nonaccrual Restructured Loans	1,379	1,904	2,627
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,191	1,246	1,174
Nonaccrual Restructured Loans	$ 0	$ 1	$ 6