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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Financing Receivable, Impaired [Line Items] |  |
Specific Allowance | $ 0 | $ 0
Recorded Balance | 1,298 | 1,660
Unpaid Principal Balance | 1,298 | 1,660
Specific Allowance | 0 | 0
Average Investment in Impaired Loans | 1,536 | 1,800
Interest Income Recognized | 86 | 84
Interest on Cash Basis | 73 | 87
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 |  | 3
Specific Allowance |  | 0
Recorded Balance |  | 0
Unpaid Principal Balance |  | 0
Specific Allowance |  | 0
Average Investment in Impaired Loans |  | 3
Interest Income Recognized |  | 0
Interest on Cash Basis |  | 0
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Balance, Loans without a specific allowance | 46 | 304
Unpaid Principal Balance, Loans without a specific allowance | 46 | 304
Average Investment in Impaired Loans, Loans without a specific allowance | 265 | 382
Interest Income Recognized, Loans without a specific allowance | 19 | 23
Interest on Cash Basis, Loans without a specific allowance | 23 | 25
Recorded Balance | 46 | 304
Unpaid Principal Balance | 46 | 304
Average Investment in Impaired Loans | 265 | 382
Interest Income Recognized | 19 | 23
Interest on Cash Basis | 23 | 25
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Balance, Loans without a specific allowance |  | 5
Unpaid Principal Balance, Loans without a specific allowance |  | 5
Average Investment in Impaired Loans, Loans without a specific allowance |  | 9
Interest Income Recognized, Loans without a specific allowance | 0 | 0
Interest on Cash Basis, Loans without a specific allowance | 0 | 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 |  | 5
Unpaid Principal Balance |  | 5
Specific Allowance |  | 0
Average Investment in Impaired Loans |  | 9
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 | 1,252 | 1,336
Unpaid Principal Balance, Loans without a specific allowance | 1,252 | 1,336
Average Investment in Impaired Loans, Loans without a specific allowance | 1,271 | 1,388
Interest Income Recognized, Loans without a specific allowance | 67 | 61
Interest on Cash Basis, Loans without a specific allowance | 50 | 62
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 | 1,252 | 1,336
Unpaid Principal Balance | 1,252 | 1,336
Specific Allowance |  | 0
Average Investment in Impaired Loans | 1,271 | 1,388
Interest Income Recognized | 67 | 61
Interest on Cash Basis | $ 50 | 62
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 |  | 15
Unpaid Principal Balance, Loans without a specific allowance |  | 15
Average Investment in Impaired Loans, Loans without a specific allowance |  | 18
Interest Income Recognized, Loans without a specific allowance |  | 0
Interest on Cash Basis, Loans without a specific allowance |  | 0
Recorded Balance |  | 15
Unpaid Principal Balance |  | 15
Average Investment in Impaired Loans |  | 18
Interest Income Recognized |  | 0
Interest on Cash Basis |  | $ 0

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