Loans Receivable and ACL (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023		Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 611,102		$ 597,896
Loans and Leases Receivable, Allowance			$ (5,858)	(5,229)		$ (5,509)	$ (5,604)	$ (5,624)
Loans and Leases Receivable, Net Amount				$ 592,667
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		611,102
Allowance for Credit Loss, Excluding Accrued Interest		6,007
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		$ 605,095
Percentage of Loan Type		100.00%		100.00%
One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 85,081		$ 65,808
Loans and Leases Receivable, Allowance			(2,063)	$ (716)		(704)	(649)	(731)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		85,081
Allowance for Credit Loss, Excluding Accrued Interest		$ 2,264
Percentage of Loan Type		13.90%		11.00%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 179,039		$ 179,117
Loans and Leases Receivable, Allowance			(713)	$ (1,109)		(1,055)	(1,053)	(1,114)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		179,039
Allowance for Credit Loss, Excluding Accrued Interest		$ 721
Percentage of Loan Type		29.30%		30.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 171,112		$ 178,424
Loans and Leases Receivable, Allowance			(1,264)	$ (1,814)		(1,608)	(1,108)	(1,157)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		171,112
Allowance for Credit Loss, Excluding Accrued Interest		$ 1,212
Percentage of Loan Type		28.00%		29.80%
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 162,460		$ 166,908	[1]
Loans and Leases Receivable, Allowance			(1,404)	$ (1,139)		(1,814)	(2,321)	(2,497)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[1]	162,460
Allowance for Credit Loss, Excluding Accrued Interest		$ 1,393
Percentage of Loan Type	[1]	26.60%		27.90%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 12,919		$ 7,639	[2]
Loans and Leases Receivable, Allowance			$ (414)	$ (449)		$ (82)	$ (113)	$ (123)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	[2]	12,919
Allowance for Credit Loss, Excluding Accrued Interest		$ 417
Percentage of Loan Type	[2]	2.10%		1.30%

[1] (1) Includes PPP loans and business overdrafts

[2] 2) Includes personal loans and consumer overdrafts