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Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023
Real estate loans
Total loans	$ 654,633		$ 646,389	$ 661,147
Unearned fees and discounts, net	(377)		(407)
Allowance for credit losses	7,346	$ 7,472	7,499	7,935	$ 7,450	$ 7,139
Loans, net	647,664		639,297
One- to four-family [Member]
Real estate loans
Total loans	177,733		177,263	175,817
Allowance for credit losses	1,579	1,628	1,774	1,809	1,906	1,898
Multi-family [Member]
Real estate loans
Total loans	129,371		126,031	128,625
Allowance for credit losses	1,681	1,762	1,764	1,865	1,115	1,121
Home equity lines of credit [Member]
Real estate loans
Total loans	9,887		9,859	9,494
Allowance for credit losses	134	147	148	147	134	121
Construction [Member]
Real estate loans
Total loans	31,326		33,708	39,906
Allowance for credit losses	298	278	337	539	1,165	765
Commercial [Member]
Real estate loans
Total loans	205,348		200,017	215,565
Allowance for credit losses	2,378	2,362	2,358	2,593	2,265	2,369
Commercial [Member]
Real estate loans
Total loans	94,042		91,784	83,698
Allowance for credit losses	1,216	1,236	1,053	915	788	794
Consumer [Member]
Real estate loans
Total loans	6,926		7,727	8,042
Allowance for credit losses	$ 60	$ 59	$ 65	$ 67	$ 77	$ 71

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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