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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable, Impaired [Line Items] |  |
Specific Allowance | $ 0 | $ 0
Recorded Balance | 1,385 | 1,298
Unpaid Principal Balance | 1,385 | 1,298
Specific Allowance | 0 | 0
Average Investment in Impaired Loans | 1,401 | 1,536
Interest Income Recognized | 19 | 86
Interest on Cash Basis | 17 | 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 | 35 | 46
Unpaid Principal Balance, Loans without a specific allowance | 35 | 46
Average Investment in Impaired Loans, Loans without a specific allowance | 40 | 265
Interest Income Recognized, Loans without a specific allowance | 4 | 19
Interest on Cash Basis, Loans without a specific allowance | 4 | 23
Specific Allowance |  | 0
Recorded Balance | 35 | 46
Unpaid Principal Balance | 35 | 46
Specific Allowance |  | 0
Average Investment in Impaired Loans | 40 | 265
Interest Income Recognized | 4 | 19
Interest on Cash Basis | 4 | 23
Consumer [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, 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 |  | 0
Unpaid Principal Balance |  | 0
Specific Allowance |  | 0
Average Investment in Impaired Loans |  | 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 | 1,350 | 1,252
Unpaid Principal Balance, Loans without a specific allowance | 1,350 | 1,252
Average Investment in Impaired Loans, Loans without a specific allowance | 1,361 | 1,271
Interest Income Recognized, Loans without a specific allowance | 15 | 67
Interest on Cash Basis, Loans without a specific allowance | 13 | 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 |  | 0
Interest Income Recognized, Loans with a specific allowance |  | 0
Interest on Cash Basis, Loans with a specific allowance |  | 0
Recorded Balance | 1,350 | 1,252
Unpaid Principal Balance | 1,350 | 1,252
Specific Allowance |  | 0
Average Investment in Impaired Loans | 1,361 | 1,271
Interest Income Recognized | 15 | 67
Interest on Cash Basis | $ 13 | 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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