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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Financing Receivable, Impaired [Line Items]
Specific Allowance	$ 0	$ 0	$ 0	$ 0	$ 0
Recorded Balance	1,389	1,550	1,389	1,550	1,660
Unpaid Principal Balance	1,389	1,550	1,389	1,550	1,660
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans	1,406	1,592	1,396	1,577	1,800
Interest Income Recognized	15	15	15	29	84
Interest on Cash Basis	35	15	32	30	87
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		6		6
Unpaid Principal Balance, Loans without a specific allowance		6		6
Average Investment in Impaired Loans, Loans without a specific allowance		12		11	3
Recorded Balance		6		6
Unpaid Principal Balance		6		6
Average Investment in Impaired Loans		12		11	3
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	51	48	51	48	304
Unpaid Principal Balance, Loans without a specific allowance	51	48	51	48	304
Average Investment in Impaired Loans, Loans without a specific allowance	55	54	53	52	382
Interest Income Recognized, Loans without a specific allowance					23
Interest on Cash Basis, Loans without a specific allowance					25
Recorded Balance	51	48	51	48	304
Unpaid Principal Balance	51	48	51	48	304
Average Investment in Impaired Loans	55	54		52	382
Interest Income Recognized			53		23
Interest on Cash Basis					25
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	3	8	3	8	5
Unpaid Principal Balance, Loans without a specific allowance	3	8	3	8	5
Specific Allowance, Loans without a specific allowance					0
Average Investment in Impaired Loans, Loans without a specific allowance	4	10	3	10	9
Recorded Balance, Loans with a specific allowance	0	0	0	0	0
Unpaid Principal Balance, Loans with a specific allowance	0	0	0	0	0
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans, Loans with a specific allowance	0	0	0	0	0
Interest Income Recognized, Loans with a specific allowance	0	0	0	0	0
Interest on Cash Basis, Loans with a specific allowance	0	0	0	0	0
Recorded Balance	3	8	3	8	5
Unpaid Principal Balance	3	8	3	8	5
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans	4	10		10	9
Interest Income Recognized			3
One- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	1,335	1,470	1,335	1,470	1,336
Unpaid Principal Balance, Loans without a specific allowance	1,335	1,470	1,335	1,470	1,336
Specific Allowance, Loans without a specific allowance					0
Average Investment in Impaired Loans, Loans without a specific allowance	1,347	1,496	1,340	1,486	1,388
Interest Income Recognized, Loans without a specific allowance	15	15	15	29	61
Interest on Cash Basis, Loans without a specific allowance	35	15	32	30	62
Recorded Balance, Loans with a specific allowance	0	0	0	0	0
Unpaid Principal Balance, Loans with a specific allowance	0	0	0	0	0
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans, Loans with a specific allowance	0	0	0	0	0
Interest Income Recognized, Loans with a specific allowance	0	0	0	0	0
Interest on Cash Basis, Loans with a specific allowance	0	0	0	0	0
Recorded Balance	1,335	1,470	1,335	1,470	1,336
Unpaid Principal Balance	1,335	1,470	1,335	1,470	1,336
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans	1,347	1,496	1,340	1,486	1,388
Interest Income Recognized	15	15	15	29	61
Interest on Cash Basis	$ 35	15	$ 32	30	62
Home equity lines of credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance		18		18	15
Unpaid Principal Balance, Loans without a specific allowance		18		18	15
Average Investment in Impaired Loans, Loans without a specific allowance		20		18	18
Recorded Balance		18		18	15
Unpaid Principal Balance		18		18	15
Average Investment in Impaired Loans		$ 20		$ 18	$ 18

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