Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	$ 114,400	$ 100,800	$ 92,000	$ 110,000
Unfunded Commitment [Member]
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for credit losses	5,100	$ 5,100
Acquisition-related provision for credit losses	$ 800