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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Financing Receivable, Impaired [Line Items]
Specific Allowance	$ 0	$ 0	$ 0	$ 0	$ 0
Recorded Balance	1,114	1,393	1,114	1,393	1,298
Unpaid Principal Balance	1,114	1,393	1,114	1,393	1,298
Specific Allowance	0	0	0	0	0
Average Investment in Impaired Loans	1,119	1,398	1,125	1,416	1,536
Interest Income Recognized	7	15	18	51	86
Interest on Cash Basis	7	10	17	44	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	38	65	38	65	46
Unpaid Principal Balance, Loans without a specific allowance	38	65	38	65	46
Average Investment in Impaired Loans, Loans without a specific allowance	40	67		73	265
Interest Income Recognized, Loans without a specific allowance	1		1		19
Interest on Cash Basis, Loans without a specific allowance	1	1			23
Specific Allowance					0
Average Investment in Impaired Loans, Loans with a specific allowance			42
Interest Income Recognized, Loans with a specific allowance			3	2
Interest on Cash Basis, Loans with a specific allowance			3	2
Recorded Balance	38	65	38	65	46
Unpaid Principal Balance	38	65	38	65	46
Specific Allowance					0
Average Investment in Impaired Loans	40	67	42	73	265
Interest Income Recognized	1	1	3	2	19
Interest on Cash Basis	1	1	3	2	23
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Balance, Loans without a specific allowance	0		0		0
Unpaid Principal Balance, Loans without a specific allowance	0		0		0
Average Investment in Impaired Loans, Loans without a specific allowance	0				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		0
Interest Income Recognized, Loans with a specific allowance					0
Recorded Balance	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Specific Allowance					0
Average Investment in Impaired Loans	0		0	0	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	1,076	1,328	1,076	1,328	1,252
Unpaid Principal Balance, Loans without a specific allowance	1,076	1,328	1,076	1,328	1,252
Average Investment in Impaired Loans, Loans without a specific allowance	1,079	1,331			1,271
Interest Income Recognized, Loans without a specific allowance	6	14			67
Interest on Cash Basis, Loans without a specific allowance	6	9			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			1,083	1,343	0
Interest Income Recognized, Loans with a specific allowance			15	49	0
Interest on Cash Basis, Loans with a specific allowance			14	42
Recorded Balance	1,076	1,328	1,076	1,328	1,252
Unpaid Principal Balance	1,076	1,328	1,076	1,328	1,252
Specific Allowance					0
Average Investment in Impaired Loans	1,079	1,331	1,083	1,343	1,271
Interest Income Recognized	6	14	15	49	67
Interest on Cash Basis	$ 6	$ 9	$ 14	$ 42	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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