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Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Real estate loans
Total loans	$ 650,681		$ 594,324	$ 585,814
Unearned fees and discounts, net	(370)		(272)
Allowance for credit losses	7,725	$ 7,935	7,139	7,535	$ 7,166	$ 7,052
Loans, net	643,326		587,457
One- to four-family [Member]
Real estate loans
Total loans	176,117		163,854
Multi-family [Member]
Real estate loans
Total loans	127,757		89,649	98,891
Allowance for credit losses	1,789	1,865	1,121	1,285	1,402	1,375
Home equity lines of credit [Member]
Real estate loans
Total loans	9,602		8,066	7,058
Allowance for credit losses	147	147	121	98	101	70
Construction [Member]
Real estate loans
Total loans	41,342		50,973	42,881
Allowance for credit losses	537	539	765	686	585	489
Commercial [Member]
Real estate loans
Total loans	198,823		193,707	198,976
Allowance for credit losses	2,313	2,593	2,369	2,510	2,392	1,985
Commercial [Member]
Real estate loans
Total loans	89,383		79,693	71,129
Allowance for credit losses	1,045	915	794	889	871	2,025
Consumer [Member]
Real estate loans
Total loans	7,657		8,382	8,491
Allowance for credit losses	$ 66	$ 67	$ 71	$ 77	$ 93	$ 80

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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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