Allowance for Credit Losses and Credit Quality of Loans, Allowance for Loan Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 100,800	$ 92,000	$ 110,000
Charge-offs	(26,778)	(18,643)	(20,106)
Recoveries		10,296	10,363
Provision	25,274	17,147	(8,257)
Balance, end of period	114,400	100,800	92,000
ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	100,152
Allowance for credit loss on PCD acquired loans	5,772
Charge-offs	(26,778)
Recoveries	9,980
Provision	25,274
Balance, end of period	114,400	100,152
Commercial Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	34,722	28,941	50,942
Charge-offs		(1,870)	(4,638)
Recoveries		2,430	723
Provision		5,221	(18,086)
Balance, end of period		34,722	28,941
Commercial Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	34,662
Allowance for credit loss on PCD acquired loans	5,300
Charge-offs	(4,154)
Recoveries	3,625
Provision	6,470
Balance, end of period	45,903	34,662
Consumer Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	50,951	44,253	37,803
Charge-offs		(16,140)	(14,489)
Recoveries		7,014	8,571
Provision		15,824	12,368
Balance, end of period		50,951	44,253
Consumer Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	50,951
Allowance for credit loss on PCD acquired loans	19
Charge-offs	(22,107)
Recoveries	5,859
Provision	11,705
Balance, end of period	46,427	50,951
Residential [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	15,127	18,806	21,255
Charge-offs	(517)	(633)	(979)
Recoveries		852	1,069
Provision		(3,898)	(2,539)
Balance, end of period		15,127	$ 18,806
Residential [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	14,539
Allowance for credit loss on PCD acquired loans	453
Charge-offs	(517)
Recoveries	496
Provision	7,099
Balance, end of period	$ 22,070	$ 14,539