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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net recoveries on investment securities | $ (3) | $ (3) | $ (8) | $ (106)
Held-to-maturity Securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Recoveries (other than temporary impairment OTTI) on investment securities | 3 | 3 | 8 | 106
Held to Maturity - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | 0 | 0 | 0
Net recoveries on investment securities | $ 3 | $ 3 | $ 8 | $ 106
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 | 1.73% | 1.86% | 1.73% | 1.86%
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 | 28.92% | 22.47% | 28.92% | 22.47%
OTTI significant inputs - Loss severity rate | 18.93% | 16.34% | 18.93% | 16.34%
Weighted Average |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 13.18% | 10.91% | 13.18% | 10.91%
OTTI significant inputs - Collateral default rate | 13.94% | 10.44% | 13.94% | 10.44%
OTTI significant inputs - Loss severity rate | 5.79% | 4.02% | 5.79% | 4.02%

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