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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 | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 520,526 | $ 515,887
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 512,746 | 510,504
Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,919 | 3,633
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 861 | 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 | 117,435 | 128,876
One- to four-family [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 116,980 | 127,279
One- to four-family [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans |  | 775
One- to four-family [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 455 | 822
Multi-family [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 104,433 | 96,195
Multi-family [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 104,170 | 95,925
Multi-family [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 263 | 270
Home equity lines of credit [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,688 | 8,551
Home equity lines of credit [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 6,688 | 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 | 25,345 | 22,042
Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 25,345 | 22,042
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 155,884 | 145,113
Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 154,833 | 143,727
Commercial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 954 | 1,073
Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 97 | 313
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 103,088 | 107,581
Commercial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 97,078 | 105,605
Commercial [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 5,964 | 1,651
Commercial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 46 | 81
Commercial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans |  | 244
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,653 | 7,529
Consumer [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 7,652 | 7,524
Consumer [Member] | Watch [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1 |
Consumer [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans |  | $ 5

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