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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Held-to-maturity Securities, Amortized Cost:
Due within one year	$ 94,888
Due after one year to five years	91,471
Due after five years to ten years	8,932
Due after ten years	70,794
Total	266,085	$ 270,218	[1]
Held-to-maturity Securities, Estimated Fair Value:
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	93,677
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	85,469
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	8,140
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	67,075
Debt Securities, Held-to-Maturity, Fair Value, Total	254,361	253,766
Available-for-sale Securities, Amortized Cost:
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	387
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	2,568
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	5,793
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	32,744
Amortized Cost	41,492	$ 43,132
Available-for-sale Securities, Estimated Fair Value:
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	385
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	2,553
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	5,758
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	31,750
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	$ 40,446
[1] Derived from audited consolidated financial statements.

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