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Condensed Financial Information - Parent Company Only: Condensed Statements of Operations, Parent Company (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
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | $ 7,905 | $ 7,143 | $ 3,576
Interest on investment securities |  |  |  |  |  |  |  |  | 9,129 | 9,384 | 3,488
Income before income taxes and equity in undistributed income of Bank | $ 7,927 | $ 7,459 | $ 7,178 | $ 7,842 | $ 8,266 | $ 7,972 | $ 8,368 | $ 9,388 | 30,406 | 33,994 | 29,562
Benefit 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
Net income | $ 6,355 | $ 5,924 | $ 5,708 | $ 6,296 | $ 6,642 | $ 6,306 | $ 6,663 | $ 7,507 | 24,283 | 27,118 | 23,600
Parent Company |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | 0 | 0 | 3
Interest on investment securities |  |  |  |  |  |  |  |  | 24 | 24 | 24
Dividends from Bank |  |  |  |  |  |  |  |  | 14,000 | 11,400 | 10,255
Total operating income |  |  |  |  |  |  |  |  | 14,024 | 11,424 | 10,282
Operating expenses |  |  |  |  |  |  |  |  | 328 | 351 | 303
Income before income taxes and equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 13,696 | 11,073 | 9,979
Benefit for income taxes |  |  |  |  |  |  |  |  | (145) | (148) | (139)
Income before undistributed income of Bank |  |  |  |  |  |  |  |  | 13,841 | 11,221 | 10,118
Equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 10,442 | 15,897 | 13,482
Net income |  |  |  |  |  |  |  |  | $ 24,283 | $ 27,118 | $ 23,600

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