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Investment Securities: Narrative-Realized Gains (Losses) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security | Sep. 30, 2021 USD ($)
Investments [Abstract] |  |  |
Loss on sale of securities | $ 3 | $ 3 |
Held-to-maturity securities, realized loss, number of securities | security | 15 | 15 |
Security owned and pledged as collateral | $ 89,580 |  | $ 97,600

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