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Loans and Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Jun. 30, 2022
Financing Receivable, Impaired [Line Items]
Recorded Balance	$ 1,114	$ 1,114	$ 1,385
Unpaid Principal Balance	1,114	1,114	1,385
Specific Allowance	0	0	0
Average Investment in Impaired Loans	1,119	1,125	1,401
Interest Income Recognized	7	18	19
Interest on Cash Basis	7	17	17
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	38	38	35
Unpaid Principal Balance, Loans without a specific valuation allowance	38	38	35
Average Investment in Impaired Loans, Loans without a specific valuation allowance	40	42	40
Interest Income Recognized, Loans without a specific valuation allowance	1	3	4
Interest on Cash Basis, Loans without a specific valuation allowance	1	3	4
Recorded Balance	38	38	35
Unpaid Principal Balance	38	38	35
Average Investment in Impaired Loans	40	42	40
Interest Income Recognized	1	3	4
Interest on Cash Basis	1	3	4
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	0	0
Recorded Balance	0	0
One- to four-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific valuation allowance	1,076	1,076	1,350
Unpaid Principal Balance, Loans without a specific valuation allowance	1,076	1,076	1,350
Average Investment in Impaired Loans, Loans without a specific valuation allowance	1,079	1,083	1,361
Interest Income Recognized, Loans without a specific valuation allowance	6	15	15
Interest on Cash Basis, Loans without a specific valuation allowance	6	14	13
Recorded Balance	1,076	1,076
Unpaid Principal Balance	1,076	1,076
Average Investment in Impaired Loans	1,079	1,083
Interest Income Recognized	6	15
Interest on Cash Basis	$ 6	$ 14
Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance			1,350
Unpaid Principal Balance			1,350
Average Investment in Impaired Loans			1,361
Interest Income Recognized			15
Interest on Cash Basis			$ 13

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