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Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Financing Receivable, Past Due [Line Items]
FinancingReceivableNonaccrualWithAllowance	$ 98	$ 144
Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	22,713	11,631
Financing Receivable, Nonaccrual	22,811	11,775
One-to-four family | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	1,874	3,554
FinancingReceivableNonaccrualWithAllowance	0	0
Financing Receivable, Nonaccrual	1,874	3,554
Multifamily | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	2,249	2,238
FinancingReceivableNonaccrualWithAllowance	0	0
Financing Receivable, Nonaccrual	2,249	2,238
Commercial real estate | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	6,104	4,522
FinancingReceivableNonaccrualWithAllowance	0	0
Financing Receivable, Nonaccrual	6,104	4,522
Business | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	12,486	1,317
FinancingReceivableNonaccrualWithAllowance	0	100
Financing Receivable, Nonaccrual	12,486	1,417
Consumer | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	0	0
FinancingReceivableNonaccrualWithAllowance	98	44
Financing Receivable, Nonaccrual	$ 98	$ 44

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Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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