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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 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 496,397 | $ 493,753 | $ 500,301
Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 490,471 | 488,010 |
Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,802 | 2,415 |
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,124 | 3,318 |
Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 10 |
One- to four-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 127,679 | 129,290 | 130,800
One- to four-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 126,043 | 127,386 |
One- to four-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,636 | 1,904 |
Multi-family [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 102,756 | 104,663 | 108,391
Multi-family [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 102,482 | 104,504 |
Multi-family [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 274 | 159 |
Home equity lines of credit [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,867 | 8,938 | 8,913
Home equity lines of credit [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,713 | 8,918 |
Home equity lines of credit [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 137 |  |
Home equity lines of credit [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 17 | 20 |
Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18,749 | 16,113 | 12,447
Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18,749 | 16,113 |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 148,299 | 143,367 | 158,226
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 146,929 | 142,076 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,090 | 1,040 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 280 | 251 |
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 82,692 | 84,246 | 74,231
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 80,208 | 81,906 |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,575 | 1,375 |
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 909 | 965 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,355 | 7,136 | $ 7,293
Consumer [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,347 | 7,107 |
Consumer [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 8 | 19 |
Consumer [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | $ 10 |

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