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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 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 525,033 | $ 515,887 | $ 496,903
Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 520,620 | 510,504 |
Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,239 | 3,633 |
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,174 | 1,506 |
Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 244 |
One- to four-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 125,574 | 128,876 | 126,152
One- to four-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 124,265 | 127,279 |
One- to four-family [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 724 | 775 |
One- to four-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 585 | 822 |
Multi-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 106,886 | 96,195 | 105,548
Multi-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 106,617 | 95,925 |
Multi-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 269 | 270 |
Home equity lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,147 | 8,551 | 8,897
Home equity lines of credit [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,147 | 8,402 |
Home equity lines of credit [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 134 |
Home equity lines of credit [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 15 |
Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 10,050 | 22,042 | 17,267
Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 10,050 | 22,042 |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 157,096 | 145,113 | 146,500
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 155,866 | 143,727 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 991 | 1,073 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 239 | 313 |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 109,182 | 107,581 | 84,825
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 107,581 | 105,605 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,524 | 1,651 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 77 | 81 |
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 244 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,098 | 7,529 | $ 7,714
Consumer [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,094 | 7,524 |
Consumer [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 4 | $ 5 |

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