Loans Receivable and ACL (Details) - USD ($) $ in Thousands		Sep. 30, 2024		Jun. 30, 2024	Mar. 31, 2024		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 619,214			$ 622,878
Loans and Leases Receivable, Allowance					(5,871)
Loans and Leases Receivable, Net Amount					617,007
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		619,214			622,878
Allowance for Credit Loss, Excluding Accrued Interest		6,242		$ 5,955	5,871		$ 6,007	$ 5,858	$ 5,229
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		$ 612,972			$ 617,007
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		$ 77,847			$ 82,787
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		77,847			82,787
Allowance for Credit Loss, Excluding Accrued Interest		$ 2,013		2,050	$ 2,005		2,264	2,063	716
Percentage of Loan Type		12.60%			13.30%
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 173,366			$ 177,203
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		173,366			177,203
Allowance for Credit Loss, Excluding Accrued Interest		$ 759		762	$ 720		721	713	1,109
Percentage of Loan Type		28.00%			28.40%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 179,108			$ 175,384
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		179,108			175,384
Allowance for Credit Loss, Excluding Accrued Interest		$ 1,247		1,234	$ 1,222		1,212	1,264	1,814
Percentage of Loan Type		28.90%			28.20%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 3,760			$ 2,203
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		3,760			2,203
Allowance for Credit Loss, Excluding Accrued Interest		$ 4		3	$ 1		0	0	0
Percentage of Loan Type		0.60%			0.40%
Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 169,138			$ 169,602	[1]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		169,138	[1]		169,602
Allowance for Credit Loss, Excluding Accrued Interest		$ 1,539		1,295	$ 1,415		1,393	1,404	1,139
Percentage of Loan Type	[1]	27.30%			27.20%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income		$ 15,995			$ 15,699	[2]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		15,995	[2]		15,699
Allowance for Credit Loss, Excluding Accrued Interest		$ 607		$ 553	$ 450		$ 417	$ 414	$ 449
Percentage of Loan Type	[2]	2.60%			2.50%

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

[2] 2) Includes personal loans and consumer overdrafts