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Loans (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($) loan	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accrued interest receivable on loans	$ 46,700,000		$ 46,300,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest and dividends receivable		Interest and dividends receivable
Allowance for credit losses - loans	$ 40,037,000	$ 40,752,000	$ 40,152,000	$ 40,161,000
Provision for credit losses	$ 4,300,000	$ 600,000
Percentage of financing receivable non-performing loans	86.50%		120.50%
Percentage of financing receivable on total loans	0.59%		0.60%
Multi-family residential
Number of multifamily loans | loan	4
Non-performing loan	$ 14,500,000
Ratio of average loan percentage	62.7
Number of loan modifications	$ 0
Number of TDR loan modifications | loan	0

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The percentage of allowance for credit loss on total non performing loans.

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The percentage of allowance for credit loss on total financial receivables.

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Represents average loan-to-value ratio of loans that became non-performing.

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Number of financing receivable that have been modified by troubled debt restructurings to borrowers experiencing financial difficulty.

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Number of loans that became non-performing during the reporting period.

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Amount of loans that became non-performing during the reporting period.

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Amount, after allowance for credit loss, of accrued interest on financing receivable.

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Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on financing receivable.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

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

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