Nonaccrual Loans (Details) - Nonperforming - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	$ 12,385	$ 11,481
One-to-four family
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	4,066	4,892
Multifamily
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	71	515
Commercial real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	7,275	4,601
Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	973	1,448
Consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Nonaccrual	$ 0	$ 25