Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	$ 93,600	$ 90,000	$ 92,000	$ 98,500	$ 105,000	$ 110,000
Unfunded Commitment [Member]
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	$ 5,100		$ 5,100