Allowance for Credit Losses - Amortized Cost Basis of Revolving Loans that Were Converted to Term Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 1,011	$ 4,222	$ 2,812	$ 32,746
Commercial and Industrial
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	30	294	259	28,522
Home equity Line
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	538	$ 3,928	1,617	3,928
Consumer
Credit quality
Total Revolving Loans Converted to Term Loans During the Period	$ 443		$ 936
Residential Mortgage.
Credit quality
Total Revolving Loans Converted to Term Loans During the Period				$ 296