Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	$ 555,397	$ 579,504
Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	153,141	162,261
Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	151,425	155,274
Multifamily | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	778	897
Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	938	6,090
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	174,102	175,313
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	166,227	164,543
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	720	8,157
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	7,155	2,613
Business
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	158,327	170,031
Business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	144,449	155,196
Business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	6,245	6,302
Business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	7,633	8,533
One-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	68,294	70,261
One-to-four family | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	62,647	65,369
One-to-four family | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,647	4,892
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,533	1,638
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,533	1,613
Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	$ 0	$ 25