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Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023
--- | --- | --- | --- | --- | --- | ---
Real estate loans |  |  |  |  |  |
Total loans | $ 654,633 |  | $ 646,389 | $ 661,147 |  |
Unearned fees and discounts, net | (377) |  | (407) |  |  |
Allowance for credit losses | 7,346 | $ 7,472 | 7,499 | 7,935 | $ 7,450 | $ 7,139
Loans, net | 647,664 |  | 639,297 |  |  |
One- to four-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 177,733 |  | 177,263 | 175,817 |  |
Allowance for credit losses | 1,579 | 1,628 | 1,774 | 1,809 | 1,906 | 1,898
Multi-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 129,371 |  | 126,031 | 128,625 |  |
Allowance for credit losses | 1,681 | 1,762 | 1,764 | 1,865 | 1,115 | 1,121
Home equity lines of credit [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 9,887 |  | 9,859 | 9,494 |  |
Allowance for credit losses | 134 | 147 | 148 | 147 | 134 | 121
Construction [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 31,326 |  | 33,708 | 39,906 |  |
Allowance for credit losses | 298 | 278 | 337 | 539 | 1,165 | 765
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 205,348 |  | 200,017 | 215,565 |  |
Allowance for credit losses | 2,378 | 2,362 | 2,358 | 2,593 | 2,265 | 2,369
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 94,042 |  | 91,784 | 83,698 |  |
Allowance for credit losses | 1,216 | 1,236 | 1,053 | 915 | 788 | 794
Consumer [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 6,926 |  | 7,727 | 8,042 |  |
Allowance for credit losses | $ 60 | $ 59 | $ 65 | $ 67 | $ 77 | $ 71

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