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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Impaired [Line Items]
Specific Allowance	$ 0	$ 0
Recorded Balance	1,385	1,298
Unpaid Principal Balance	1,385	1,298
Specific Allowance	0	0
Average Investment in Impaired Loans	1,401	1,536
Interest Income Recognized	19	86
Interest on Cash Basis	17	73
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		0
Unpaid Principal Balance, Loans without a specific allowance		0
Average Investment in Impaired Loans, Loans without a specific allowance		0
Specific Allowance		0
Recorded Balance		0
Unpaid Principal Balance		0
Specific Allowance		0
Average Investment in Impaired Loans		0
Interest Income Recognized		0
Interest on Cash Basis		0
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	35	46
Unpaid Principal Balance, Loans without a specific allowance	35	46
Average Investment in Impaired Loans, Loans without a specific allowance	40	265
Interest Income Recognized, Loans without a specific allowance	4	19
Interest on Cash Basis, Loans without a specific allowance	4	23
Specific Allowance		0
Recorded Balance	35	46
Unpaid Principal Balance	35	46
Specific Allowance		0
Average Investment in Impaired Loans	40	265
Interest Income Recognized	4	19
Interest on Cash Basis	4	23
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		0
Unpaid Principal Balance, Loans without a specific allowance		0
Average Investment in Impaired Loans, Loans without a specific allowance		0
Interest Income Recognized, Loans without a specific allowance		0
Interest on Cash Basis, Loans without a specific allowance		0
Recorded Balance, Loans with a specific allowance		0
Unpaid Principal Balance, Loans with a specific allowance		0
Specific Allowance		0
Average Investment in Impaired Loans, Loans with a specific allowance		0
Interest Income Recognized, Loans with a specific allowance		0
Interest on Cash Basis, Loans with a specific allowance		0
Recorded Balance		0
Unpaid Principal Balance		0
Specific Allowance		0
Average Investment in Impaired Loans		0
Interest Income Recognized		0
Interest on Cash Basis		0
One- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	1,350	1,252
Unpaid Principal Balance, Loans without a specific allowance	1,350	1,252
Average Investment in Impaired Loans, Loans without a specific allowance	1,361	1,271
Interest Income Recognized, Loans without a specific allowance	15	67
Interest on Cash Basis, Loans without a specific allowance	13	50
Recorded Balance, Loans with a specific allowance		0
Unpaid Principal Balance, Loans with a specific allowance		0
Specific Allowance		0
Average Investment in Impaired Loans, Loans with a specific allowance		0
Interest Income Recognized, Loans with a specific allowance		0
Interest on Cash Basis, Loans with a specific allowance		0
Recorded Balance	1,350	1,252
Unpaid Principal Balance	1,350	1,252
Specific Allowance		0
Average Investment in Impaired Loans	1,361	1,271
Interest Income Recognized	15	67
Interest on Cash Basis	$ 13	50
Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance		0
Unpaid Principal Balance		0
Average Investment in Impaired Loans		0
Interest Income Recognized		0
Interest on Cash Basis		0
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		0
Unpaid Principal Balance, Loans without a specific allowance		0
Average Investment in Impaired Loans, Loans without a specific allowance		0
Interest Income Recognized, Loans without a specific allowance		0
Interest on Cash Basis, Loans without a specific allowance		0
Recorded Balance		0
Unpaid Principal Balance		0
Average Investment in Impaired Loans		0
Interest Income Recognized		0
Interest on Cash Basis		$ 0

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