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Commitments and Contingencies: Supply Commitment (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Commitments and Contingencies Disclosure [Abstract] |  |
Undisbursed portion of construction loans in process (see Note 4) | $ 103,168 | $ 95,224
Undisbursed lines of credit | 128,791 | 115,865
Commitments to extend credit | $ 14,699 | $ 47,422

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