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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Held-to-maturity Securities, Amortized Cost: |  |
Due within one year | $ 27,472 |
Due after one year to five years | 81,840 |
Due after five years to ten years | 1,250 |
Due after ten years | 61,535 |
Total | 172,097 |
Held-to-maturity Securities, Estimated Fair Value: |  |
Due within one year | 27,262 |
Due after one year to five years | 77,870 |
Due after five years to ten years | 1,277 |
Due after ten years | 59,598 |
Total | 166,007 | $ 253,766
Available-for-sale Securities, Amortized Cost: |  |
Due within one year | 3,934 |
Due after one year to five years | 2,131 |
Due after five years to ten years | 5,160 |
Due after ten years | 61,006 |
Total | 72,231 | $ 43,132
Available-for-sale Securities, Estimated Fair Value: |  |
Due within one year | 3,939 |
Due after one year to five years | 2,130 |
Due after five years to ten years | 5,144 |
Due after ten years | 61,044 |
Total | $ 72,257 |

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