Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Financing Receivable, Past Due [Line Items]
FinancingReceivableNonaccrualWithAllowance	$ 10
Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	15,589
Financing Receivable, Nonaccrual	15,599	$ 12,261
One-to-four family | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	4,154
Financing Receivable, Nonaccrual	4,154	4,001
Multifamily | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	824
Financing Receivable, Nonaccrual	824	71
Commercial real estate | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	4,522
Financing Receivable, Nonaccrual	4,522	7,190
Business | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	6,088
FinancingReceivableNonaccrualWithAllowance	10
Financing Receivable, Nonaccrual	6,098	998
Consumer | Nonperforming
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual, No Allowance	1
Financing Receivable, Nonaccrual	$ 1	$ 1