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Condensed Financial Information - Parent Company Only: Condensed Statements of Cash Flows, 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
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,355 | $ 5,924 | $ 5,708 | $ 6,296 | $ 6,642 | $ 6,306 | $ 6,663 | $ 7,507 | $ 24,283 | $ 27,118 | $ 23,600
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock option compensation expense |  |  |  |  |  |  |  |  | 390 | 320 | 246
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 23,020 | 30,997 | 26,500
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Purchase of investment securities held to maturity |  |  |  |  |  |  |  |  | (1,919) | (15,602) | (208,778)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (45,797) | (170,223) | (335,162)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 659 | 698 | 415
Repurchase of common stock, net of taxes |  |  |  |  |  |  |  |  | (5,958) | (4,998) | (4,583)
Payment of dividends |  |  |  |  |  |  |  |  | (7,650) | (8,267) | (7,232)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 58,784 | (48,808) | 45,221
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 36,007 | (188,034) | (263,441)
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  |  | 128,721 |  |  |  |  | 128,721 |  |
End of year | 164,728 |  |  |  | 128,721 |  |  |  | 164,728 | 128,721 |
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 24,283 | 27,118 | 23,600
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of Bank |  |  |  |  |  |  |  |  | (10,442) | (15,897) | (13,482)
Stock option compensation expense |  |  |  |  |  |  |  |  | 390 | 320 | 246
Other, net |  |  |  |  |  |  |  |  | (50) | 100 | 16
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 14,181 | 11,641 | 10,380
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Investment in Bank |  |  |  |  |  |  |  |  | (319) | (267) | (202)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (319) | (267) | (202)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 659 | 698 | 415
Repurchase of common stock, net of taxes |  |  |  |  |  |  |  |  | (5,958) | (4,998) | (4,583)
Payment of dividends |  |  |  |  |  |  |  |  | (7,650) | (8,267) | (7,232)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (12,949) | (12,567) | (11,400)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 913 | (1,193) | (1,222)
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  |  |  | $ 517 |  |  |  | $ 1,710 | 517 | 1,710 | 2,932
End of year | $ 1,430 |  |  |  | $ 517 |  |  |  | $ 1,430 | $ 517 | $ 1,710

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