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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Impaired [Line Items]
Specific Allowance	$ 0	$ 23
Recorded Balance	1,660	1,851
Unpaid Principal Balance	1,660	1,851
Specific Allowance	0	23
Average Investment in Impaired Loans	1,800	1,922
Interest Income Recognized	84	74
Interest on Cash Basis	87	83
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		18
Unpaid Principal Balance, Loans without a specific allowance		18
Average Investment in Impaired Loans, Loans without a specific allowance	3	34
Specific Allowance		0
Recorded Balance		18
Unpaid Principal Balance		18
Specific Allowance		0
Average Investment in Impaired Loans	3	34
Interest Income Recognized		0
Interest on Cash Basis		0
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	304	60
Unpaid Principal Balance, Loans without a specific allowance	304	60
Average Investment in Impaired Loans, Loans without a specific allowance	382	63
Interest Income Recognized, Loans without a specific allowance	23	6
Interest on Cash Basis, Loans without a specific allowance	25	6
Recorded Balance	304	60
Unpaid Principal Balance	304	60
Average Investment in Impaired Loans	382	63
Interest Income Recognized	23	6
Interest on Cash Basis	25	6
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	5	19
Unpaid Principal Balance, Loans without a specific allowance	5	19
Average Investment in Impaired Loans, Loans without a specific allowance	9	24
Interest Income Recognized, Loans without a specific allowance	0	2
Interest on Cash Basis, Loans without a specific allowance	0	2
Recorded Balance, Loans with a specific allowance	0	10
Unpaid Principal Balance, Loans with a specific allowance	0	10
Specific Allowance	0	10
Average Investment in Impaired Loans, Loans with a specific allowance	0	11
Interest Income Recognized, Loans with a specific allowance	0	1
Interest on Cash Basis, Loans with a specific allowance	0	1
Recorded Balance	5	29
Unpaid Principal Balance	5	29
Specific Allowance	0	10
Average Investment in Impaired Loans	9	35
Interest Income Recognized		3
Interest on Cash Basis		3
One- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	1,336	1,676
Unpaid Principal Balance, Loans without a specific allowance	1,336	1,676
Average Investment in Impaired Loans, Loans without a specific allowance	1,388	1,718
Interest Income Recognized, Loans without a specific allowance	61	63
Interest on Cash Basis, Loans without a specific allowance	62	71
Recorded Balance, Loans with a specific allowance	0	46
Unpaid Principal Balance, Loans with a specific allowance	0	46
Specific Allowance	0	13
Average Investment in Impaired Loans, Loans with a specific allowance	0	47
Interest Income Recognized, Loans with a specific allowance	0	1
Interest on Cash Basis, Loans with a specific allowance	0	1
Recorded Balance	1,336	1,722
Unpaid Principal Balance	1,336	1,722
Specific Allowance	0	13
Average Investment in Impaired Loans	1,388	1,765
Interest Income Recognized	61	64
Interest on Cash Basis	62	72
Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Average Investment in Impaired Loans, Loans without a specific allowance		1
Recorded Balance		0
Unpaid Principal Balance		0
Average Investment in Impaired Loans		1
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	22
Unpaid Principal Balance, Loans without a specific allowance	15	22
Average Investment in Impaired Loans, Loans without a specific allowance	18	24
Interest Income Recognized, Loans without a specific allowance		1
Interest on Cash Basis, Loans without a specific allowance		2
Recorded Balance	15	22
Unpaid Principal Balance	15	22
Average Investment in Impaired Loans	$ 18	24
Interest Income Recognized		1
Interest on Cash Basis		$ 2

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