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Federal Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Expected federal income tax provision at statutory rate |  |  |  |  |  |  |  |  | $ 6,385 | $ 7,139 | $ 6,208
BOLI income |  |  |  |  |  |  |  |  | (135) | (148) | (129)
Dividends on Employee Stock Ownership Plan ("ESOP") stock |  |  |  |  |  |  |  |  | (58) | (71) | (70)
Stock based compensation tax effect |  |  |  |  |  |  |  |  | (37) | (66) | (34)
Other, net |  |  |  |  |  |  |  |  | (32) | 22 | (13)
Provision for income taxes | $ 1,572 | $ 1,535 | $ 1,470 | $ 1,546 | $ 1,624 | $ 1,666 | $ 1,705 | $ 1,881 | $ 6,123 | $ 6,876 | $ 5,962

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