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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Impaired [Line Items]
Specific Allowance	$ 0	$ 0
Recorded Balance	1,298	1,660
Unpaid Principal Balance	1,298	1,660
Specific Allowance	0	0
Average Investment in Impaired Loans	1,536	1,800
Interest Income Recognized	86	84
Interest on Cash Basis	73	87
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		3
Specific Allowance		0
Recorded Balance		0
Unpaid Principal Balance		0
Specific Allowance		0
Average Investment in Impaired Loans		3
Interest Income Recognized		0
Interest on Cash Basis		0
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	46	304
Unpaid Principal Balance, Loans without a specific allowance	46	304
Average Investment in Impaired Loans, Loans without a specific allowance	265	382
Interest Income Recognized, Loans without a specific allowance	19	23
Interest on Cash Basis, Loans without a specific allowance	23	25
Recorded Balance	46	304
Unpaid Principal Balance	46	304
Average Investment in Impaired Loans	265	382
Interest Income Recognized	19	23
Interest on Cash Basis	23	25
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		5
Unpaid Principal Balance, Loans without a specific allowance		5
Average Investment in Impaired Loans, Loans without a specific allowance		9
Interest Income Recognized, Loans without a specific allowance	0	0
Interest on Cash Basis, Loans without a specific allowance	0	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		5
Unpaid Principal Balance		5
Specific Allowance		0
Average Investment in Impaired Loans		9
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	1,252	1,336
Unpaid Principal Balance, Loans without a specific allowance	1,252	1,336
Average Investment in Impaired Loans, Loans without a specific allowance	1,271	1,388
Interest Income Recognized, Loans without a specific allowance	67	61
Interest on Cash Basis, Loans without a specific allowance	50	62
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	1,252	1,336
Unpaid Principal Balance	1,252	1,336
Specific Allowance		0
Average Investment in Impaired Loans	1,271	1,388
Interest Income Recognized	67	61
Interest on Cash Basis	$ 50	62
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		15
Unpaid Principal Balance, Loans without a specific allowance		15
Average Investment in Impaired Loans, Loans without a specific allowance		18
Interest Income Recognized, Loans without a specific allowance		0
Interest on Cash Basis, Loans without a specific allowance		0
Recorded Balance		15
Unpaid Principal Balance		15
Average Investment in Impaired Loans		18
Interest Income Recognized		0
Interest on Cash Basis		$ 0

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