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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Held-to-maturity Securities, Amortized Cost: |  |  |
Due within one year | $ 0 |  |
Due after one year to five years | 11,226 |  |
Due after five years to ten years | 23,556 |  |
Due after ten years | 17,532 |  |
Total | 52,314 | $ 27,890 | [1]
Held-to-maturity Securities, Estimated Fair Value: |  |  |
Due within one year | 0 |  |
Due after one year to five years | 11,268 |  |
Due after five years to ten years | 24,064 |  |
Due after ten years | 18,264 |  |
Total | 53,596 | $ 29,827 |
Available-for-sale Securities, Amortized Cost: |  |  |
Due within one year | 926 |  |
Due after one year to five years | 2,654 |  |
Due after five years to ten years | 18,247 |  |
Due after ten years | 45,479 |  |
Total | 67,306 |  |
Available-for-sale Securities, Estimated Fair Value: |  |  |
Due within one year | 926 |  |
Due after one year to five years | 2,653 |  |
Due after five years to ten years | 18,285 |  |
Due after ten years | 45,627 |  |
Total | $ 67,491 |  |
[1] | Derived from audited consolidated financial statements.

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