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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Recoveries (other than temporary impairment OTTI) on investment securities | $ (6) | $ (14) | $ (113) | $ (46)
Net recoveries on investment securities | (6) | (14) | (113) | (34)
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 | 14 | 113 | 46
Held to Maturity - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | 0 | 0 | (12)
Net recoveries on investment securities | 6 | 14 | 113 | 34
Available-for-sale Securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
AFS - OTTI | 0 | 0 | 0 | 0
AFS - - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | 0 | 0 | 0
AFS - Net OTTI recognized in earnings | $ 0 | $ 0 | $ 0 | $ 0
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 | 2.00% | 0.00% | 2.00% | 0.00%
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 | 19.96% | 11.28% | 19.96% | 11.28%
OTTI significant inputs - Loss severity rate | 12.41% | 78.00% | 12.41% | 78.00%
Weighted Average |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 9.21% | 11.52% | 9.21% | 11.52%
OTTI significant inputs - Collateral default rate | 10.21% | 5.28% | 10.21% | 5.28%
OTTI significant inputs - Loss severity rate | 2.48% | 37.73% | 2.48% | 37.73%

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References No definition available. + Details
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