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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 114,400
Charge-offs	(6,680)		$ (26,778)
Recoveries	2,001
Provision	5,579	$ 3,909
Balance, end of period	115,300		114,400
ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		100,152	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	45,903
Charge-offs	(985)
Recoveries	198
Provision	(644)
Balance, end of period	44,472		45,903
Commercial Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		34,662	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	46,427
Charge-offs	(5,581)
Recoveries	1,651
Provision	4,922
Balance, end of period	47,419		46,427
Consumer Loans [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		50,951	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	22,070
Charge-offs	(114)		(517)
Recoveries	152
Provision	1,301
Balance, end of period	$ 23,409		22,070
Residential [Member] | ASU 2022-02 [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period		14,539	$ 14,539
Charge-offs		(339)
Recoveries		121
Provision		1,069
Balance, end of period		$ 15,390

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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