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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process (see Note 4) | $ 69,878 | $ 103,194
Undisbursed lines of credit | 119,858 | 141,537
Commitments to extend credit | $ 26,293 | $ 31,667

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