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Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Financing Receivable, Past Due [Line Items]
FinancingReceivableNonaccrualWithAllowance	$ 2,423	$ 2,339
Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	24,257	22,256
Financing Receivable, Nonaccrual	26,680	24,595
One-to-four family | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	3,222	1,519
FinancingReceivableNonaccrualWithAllowance	0	0
Financing Receivable, Nonaccrual	3,222	1,519
Multifamily | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	4,522	3,937
FinancingReceivableNonaccrualWithAllowance	0	0
Financing Receivable, Nonaccrual	4,522	3,937
Commercial real estate | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	6,956	4,545
FinancingReceivableNonaccrualWithAllowance	0	2,202
Financing Receivable, Nonaccrual	6,956	6,747
Business | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	9,494	12,255
FinancingReceivableNonaccrualWithAllowance	2,295	104
Financing Receivable, Nonaccrual	11,789	12,359
Consumer | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	63	0
FinancingReceivableNonaccrualWithAllowance	128	33
Financing Receivable, Nonaccrual	$ 191	$ 33

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