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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Held-to-maturity Securities, Amortized Cost: |  |  |
Due within one year | $ 15,148 |  |
Due after one year to five years | 67,575 |  |
Due after five years to ten years | 1,179 |  |
Due after ten years | 57,052 |  |
Total | 140,954 | $ 172,097 | [1]
Held-to-maturity Securities, Estimated Fair Value: |  |  |
Due within one year | 15,044 |  |
Due after one year to five years | 63,638 |  |
Due after five years to ten years | 1,235 |  |
Due after ten years | 54,465 |  |
Total | 134,382 | 166,007 |
Available-for-sale Securities, Amortized Cost: |  |  |
Due within one year | 4,908 |  |
Due after one year to five years | 9,576 |  |
Due after five years to ten years | 1,507 |  |
Due after ten years | 69,664 |  |
Amortized Cost | 85,655 | $ 72,231 |
Available-for-sale Securities, Estimated Fair Value: |  |  |
Due within one year | 4,895 |  |
Due after one year to five years | 9,607 |  |
Due after five years to ten years | 1,501 |  |
Due after ten years | 68,804 |  |
Total | $ 84,807 |  |
[1] | Derived from audited consolidated financial statements.

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