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Loans and Allowance for Credit Losses - Categories of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022
--- | --- | --- | --- | --- | --- | ---
Real estate loans |  |  |  |  |  |
Total loans | $ 661,147 |  | $ 594,324 | $ 568,240 |  |
Unearned fees and discounts, net | (337) |  | (272) |  |  |
Allowance for credit losses | 7,935 | $ 7,450 | 7,139 | 7,166 | $ 7,023 | $ 7,052
Loans, net | 653,549 |  | 587,457 |  |  |
One- to four-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 175,817 |  | 163,854 | 150,711 |  |
Allowance for credit losses | 1,809 | 1,906 | 1,898 | 1,722 | 1,537 | 1,028
Multi-family [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 128,625 |  | 89,649 | 100,147 |  |
Allowance for credit losses | 1,865 | 1,115 | 1,121 | 1,402 | 1,284 | 1,375
Home equity lines of credit [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 9,494 |  | 8,066 | 6,926 |  |
Allowance for credit losses | 147 | 134 | 121 | 101 | 94 | 70
Construction [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 39,906 |  | 50,973 | 36,595 |  |
Allowance for credit losses | 539 | 1,165 | 765 | 585 | 549 | 489
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 215,565 |  | 193,707 | 192,015 |  |
Allowance for credit losses | 2,593 | 2,265 | 2,369 | 2,392 | 2,386 | 1,985
Commercial [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 83,698 |  | 79,693 | 72,360 |  |
Allowance for credit losses | 915 | 788 | 794 | 871 | 1,090 | 2,025
Consumer [Member] |  |  |  |  |  |
Real estate loans |  |  |  |  |  |
Total loans | 8,042 |  | 8,382 | 9,486 |  |
Allowance for credit losses | $ 67 | $ 77 | $ 71 | $ 93 | $ 83 | $ 80

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