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, 2025	Mar. 31, 2024	Dec. 31, 2024
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	$ 116,000	$ 114,400	$ 114,400
Charge-offs	(8,155)	(6,680)	(25,728)
Recoveries	1,601	2,001
Provision	7,554	5,579
Balance, end of period	117,000	115,300	116,000
Commercial Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	45,453	45,903	45,903
Charge-offs	(2,222)	(985)
Recoveries	107	198
Provision	5,392	(644)
Balance, end of period	48,730	44,472	45,453
Consumer Loans [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	43,987	46,427	46,427
Charge-offs	(5,876)	(5,581)
Recoveries	1,406	1,651
Provision	2,179	4,922
Balance, end of period	41,696	47,419	43,987
Residential [Member]
Activity in allowance for credit losses by portfolio segment [Roll Forward]
Balance, beginning of period	26,560	22,070	22,070
Charge-offs	(57)	(114)	(211)
Recoveries	88	152
Provision	(17)	1,301
Balance, end of period	$ 26,574	$ 23,409	$ 26,560

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

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- Definition

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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- Definition

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

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-Topic 326
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