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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, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Specific Allowance | $ 0 | $ 23 | $ 0 | $ 23 | $ 23
Recorded Balance | 1,659 | 2,054 | 1,659 | 2,054 | 1,851
Unpaid Principal Balance | 1,659 | 2,054 | 1,659 | 2,054 | 1,851
Specific Allowance | 0 | 23 | 0 | 23 | 23
Average Investment in Impaired Loans | 1,687 | 2,080 | 1,731 | 2,130 | 1,922
Interest Income Recognized | 13 | 12 | 47 | 60 | 74
Interest on Cash Basis | 15 | 22 | 48 | 70 | 83
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 4 | 24 | 4 | 24 | 18
Unpaid Principal Balance, Loans without a specific allowance | 4 | 24 | 4 | 24 | 18
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 5 | 30 | 11 | 36 | 34
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 | 1 | 0 | 1 |
Unpaid Principal Balance, Loans with a specific allowance | 0 | 1 | 0 | 1 |
Specific Allowance | 0 | 1 | 0 | 1 |
Average Investment in Impaired Loans, Loans with a specific allowance | 0 | 1 | 0 | 2 |
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  |
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  |
Recorded Balance | 4 | 25 | 4 | 25 | 18
Unpaid Principal Balance | 4 | 25 | 4 | 25 | 18
Specific Allowance | 0 | 1 | 0 | 1 |
Average Investment in Impaired Loans | 5 | 31 | 11 | 38 | 34
Interest Income Recognized | 0 |  | 0 |  |
Interest on Cash Basis | 0 |  | 0 |  |
Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 41 | 167 | 41 | 167 | 60
Unpaid Principal Balance, Loans without a specific allowance | 41 | 167 | 41 | 167 | 60
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 44 | 176 | 51 | 194 | 63
Interest Income Recognized, Loans without a specific allowance | 0 |  | 0 | 5 | 6
Interest on Cash Basis, Loans without a specific allowance | 0 |  | 0 | 7 | 6
Recorded Balance, Loans with a specific allowance | 0 | 5 | 0 | 5 |
Unpaid Principal Balance, Loans with a specific allowance | 0 | 5 | 0 | 5 |
Specific Allowance | 0 | 5 | 0 | 5 |
Average Investment in Impaired Loans, Loans with a specific allowance | 0 | 5 | 0 | 7 |
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  |
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  |
Recorded Balance | 41 | 172 | 41 | 172 | 60
Unpaid Principal Balance | 41 | 172 | 41 | 172 | 60
Specific Allowance | 0 | 5 | 0 | 5 |
Average Investment in Impaired Loans | 44 | 181 | 51 | 201 | 63
Interest Income Recognized | 0 |  | 0 | 5 | 6
Interest on Cash Basis | 0 |  | 0 | 7 | 6
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 7 | 3 | 7 | 3 | 19
Unpaid Principal Balance, Loans without a specific allowance | 7 | 3 | 7 | 3 | 19
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 8 | 3 | 9 | 3 | 24
Interest Income Recognized, Loans without a specific allowance | 0 |  | 0 |  | 2
Interest on Cash Basis, Loans without a specific allowance | 0 |  | 0 |  | 2
Recorded Balance, Loans with a specific allowance | 0 |  | 0 |  | 10
Unpaid Principal Balance, Loans with a specific allowance | 0 |  | 0 |  | 10
Specific Allowance | 0 |  | 0 |  | 10
Average Investment in Impaired Loans, Loans with a specific allowance | 0 |  | 0 |  | 11
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  | 1
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  | 1
Recorded Balance | 7 | 3 | 7 | 3 | 29
Unpaid Principal Balance | 7 | 3 | 7 | 3 | 29
Specific Allowance | 0 |  | 0 |  | 10
Average Investment in Impaired Loans | 8 | 3 | 9 | 3 | 35
Interest Income Recognized | 0 |  | 0 |  | 3
Interest on Cash Basis | 0 |  | 0 |  | 3
One- to four-family [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 1,591 | 1,741 | 1,591 | 1,741 | 1,676
Unpaid Principal Balance, Loans without a specific allowance | 1,591 | 1,741 | 1,591 | 1,741 | 1,676
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 1,613 | 1,752 | 1,641 | 1,773 | 1,718
Interest Income Recognized, Loans without a specific allowance | 13 | 11 | 47 | 50 | 63
Interest on Cash Basis, Loans without a specific allowance | 15 | 20 | 48 | 57 | 71
Recorded Balance, Loans with a specific allowance | 0 | 90 | 0 | 90 | 46
Unpaid Principal Balance, Loans with a specific allowance | 0 | 90 | 0 | 90 | 46
Specific Allowance | 0 | 17 | 0 | 17 | 13
Average Investment in Impaired Loans, Loans with a specific allowance | 0 | 90 | 0 | 90 | 47
Interest Income Recognized, Loans with a specific allowance | 0 | 1 | 0 | 4 | 1
Interest on Cash Basis, Loans with a specific allowance | 0 | 1 | 0 | 4 | 1
Recorded Balance | 1,591 | 1,831 | 1,591 | 1,831 | 1,722
Unpaid Principal Balance | 1,591 | 1,831 | 1,591 | 1,831 | 1,722
Specific Allowance | 0 | 17 | 0 | 17 | 13
Average Investment in Impaired Loans | 1,613 | 1,842 | 1,641 | 1,863 | 1,765
Interest Income Recognized | 13 | 12 | 47 | 54 | 64
Interest on Cash Basis | 15 | 21 | 48 | 61 | 72
Multi-family [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 0 |  | 0 |  |
Unpaid Principal Balance, Loans without a specific allowance | 0 |  | 0 |  |
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 0 |  | 0 | 1 | 1
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 |  | 0 |  |
Unpaid Principal Balance, Loans with a specific allowance | 0 |  | 0 |  |
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans with a specific allowance | 0 |  | 0 |  |
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  |
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  |
Recorded Balance | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans | 0 |  | 0 | 1 | 1
Interest Income Recognized | 0 |  | 0 |  |
Interest on Cash Basis | 0 |  | 0 |  |
Home equity lines of credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 16 | 23 | 16 | 23 | 22
Unpaid Principal Balance, Loans without a specific allowance | 16 | 23 | 16 | 23 | 22
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 17 | 23 | 19 | 24 | 24
Interest Income Recognized, Loans without a specific allowance | 0 |  | 0 | 1 | 1
Interest on Cash Basis, Loans without a specific allowance | 0 | 1 | 0 | 2 | 2
Recorded Balance, Loans with a specific allowance | 0 |  | 0 |  |
Unpaid Principal Balance, Loans with a specific allowance | 0 |  | 0 |  |
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans with a specific allowance | 0 |  | 0 |  |
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  |
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  |
Recorded Balance | 16 | 23 | 16 | 23 | 22
Unpaid Principal Balance | 16 | 23 | 16 | 23 | 22
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans | 17 | 23 | 19 | 24 | 24
Interest Income Recognized | 0 |  | 0 | 1 | 1
Interest on Cash Basis | 0 | $ 1 | 0 | $ 2 | $ 2
Construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Balance, Loans without a specific allowance | 0 |  | 0 |  |
Unpaid Principal Balance, Loans without a specific allowance | 0 |  | 0 |  |
Specific Allowance, Loans without a specific allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans without a specific allowance | 0 |  | 0 |  |
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 |  | 0 |  |
Unpaid Principal Balance, Loans with a specific allowance | 0 |  | 0 |  |
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans, Loans with a specific allowance | 0 |  | 0 |  |
Interest Income Recognized, Loans with a specific allowance | 0 |  | 0 |  |
Interest on Cash Basis, Loans with a specific allowance | 0 |  | 0 |  |
Recorded Balance | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 0 |  |
Specific Allowance | 0 |  | 0 |  |
Average Investment in Impaired Loans | 0 |  | 0 |  |
Interest Income Recognized | 0 |  | 0 |  |
Interest on Cash Basis | $ 0 |  | $ 0 |  |

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