Allowance for Credit Losses - Amortized Cost Basis of Revolving Loans that Were Converted to Term Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 1,177	$ 8,848	$ 3,989	$ 41,594
Commercial and Industrial
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	195	5	454	28,527
Home equity Line
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	560	$ 8,843	2,177	12,771
Consumer
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 422		$ 1,358
Residential Mortgage.
Credit quality
Total Revolving Loans Converted to Term Loans During the Period				$ 296