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Loans and Allowance for Loan Losses - Credit Risk Profile of Association's Loan Portfolio Based on Rating Category and Payment Activity (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 500,682 | $ 493,753 | $ 498,578
Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 494,913 | 488,010 |
Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,057 | 2,415 |
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,712 | 3,318 |
Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 10 |
Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
One- to four-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 129,185 | 129,290 | 129,266
One- to four-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 127,480 | 127,386 |
One- to four-family [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 927 |  |
One- to four-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 778 | 1,904 |
One- to four-family [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
One- to four-family [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Multi-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 107,107 | 104,663 | 106,400
Multi-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 106,835 | 104,504 |
Multi-family [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Multi-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 272 | 159 |
Multi-family [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Multi-family [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Home equity lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 9,131 | 8,938 | 9,058
Home equity lines of credit [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,980 | 8,918 |
Home equity lines of credit [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 135 |  |
Home equity lines of credit [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 16 | 20 |
Home equity lines of credit [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Home equity lines of credit [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 20,897 | 16,113 | 14,521
Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 20,897 | 16,113 |
Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Construction [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 143,396 | 143,367 | 152,019
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 141,965 | 142,076 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,083 | 1,040 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 348 | 251 |
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Commercial [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 83,812 | 84,246 | 80,350
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 81,609 | 81,906 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,912 | 1,375 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 291 | 965 |
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Commercial [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,154 | 7,136 | $ 6,964
Consumer [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,147 | 7,107 |
Consumer [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 |  |
Consumer [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7 | 19 |
Consumer [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | $ 10 |
Consumer [Member] | Loss [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 0 |  |

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