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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Held-to-maturity Securities, Amortized Cost: |  |  |
Due within one year | $ 14,366 |  |
Due after one year to five years | 66,659 |  |
Due after five years to ten years | 663 |  |
Due after ten years | 59,882 |  |
Total | 141,570 | $ 172,097 | [1]
Held-to-maturity Securities, Estimated Fair Value: |  |  |
Due within one year | 14,293 |  |
Due after one year to five years | 63,156 |  |
Due after five years to ten years | 758 |  |
Due after ten years | 57,415 |  |
Total | 135,622 | 166,007 |
Available-for-sale Securities, Amortized Cost: |  |  |
Due within one year | 14,888 |  |
Due after one year to five years | 6,074 |  |
Due after five years to ten years | 202 |  |
Due after ten years | 66,292 |  |
Amortized Cost | 87,456 | $ 72,231 |
Available-for-sale Securities, Estimated Fair Value: |  |  |
Due within one year | 14,866 |  |
Due after one year to five years | 6,070 |  |
Due after five years to ten years | 202 |  |
Due after ten years | 65,337 |  |
Total | $ 86,475 |  |
[1] | Derived from audited consolidated financial statements.

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