Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 100,800	$ 92,000
Charge-offs	(5,850)	(4,491)
Recoveries		1,895
Provision	3,909	596
Balance, end of period	100,250	90,000
ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	100,152
Charge-offs	(5,850)
Recoveries	2,039
Provision	3,909
Balance, end of period	100,250
Commercial Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		28,941
Charge-offs		(588)
Recoveries		93
Provision		111
Balance, end of period		28,557
Commercial Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	34,662
Charge-offs	(169)
Recoveries	541
Provision	1,006
Balance, end of period	36,040
Consumer Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		44,253
Charge-offs		(3,591)
Recoveries		1,652
Provision		1,277
Balance, end of period		43,591
Consumer Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	50,951
Charge-offs	(5,342)
Recoveries	1,377
Provision	1,834
Balance, end of period	48,820
Residential [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		18,806
Charge-offs	(339)	(312)
Recoveries		150
Provision		(792)
Balance, end of period		$ 17,852
Residential [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	14,539
Charge-offs	(339)
Recoveries	121
Provision	1,069
Balance, end of period	$ 15,390