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Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net recoveries on investment securities | $ (6) | $ (6) | $ (14) | $ (113)
Held-to-maturity Securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Recoveries (other than temporary impairment OTTI) on investment securities | 6 | 6 | 14 | 113
Net recoveries on investment securities | $ 6 | $ 6 | $ 14 | $ 113
Minimum |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00% | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 1.83% | 2.00% | 1.83% | 2.00%
OTTI significant inputs - Loss severity rate | 0.00% | 0.00% | 0.00% | 0.00%
Maximum |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00% | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 21.58% | 19.96% | 21.58% | 19.96%
OTTI significant inputs - Loss severity rate | 14.53% | 12.41% | 14.53% | 12.41%
Weighted Average |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 12.84% | 9.21% | 12.84% | 9.21%
OTTI significant inputs - Collateral default rate | 13.09% | 10.21% | 13.09% | 10.21%
OTTI significant inputs - Loss severity rate | 4.82% | 2.48% | 4.82% | 2.48%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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