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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, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net recoveries on investment securities | $ (3) | $ (3) | $ (11) | $ (8)
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 | 11 | 8
Net recoveries on investment securities | $ 3 | $ 3 | $ 11 | $ 8
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 | 0.53% | 1.73% | 0.53% | 1.73%
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 | 21.55% | 28.92% | 21.55% | 28.92%
OTTI significant inputs - Loss severity rate | 8.53% | 18.93% | 8.53% | 18.93%
Weighted Average |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
OTTI significant inputs - Constant prepayment rate | 8.37% | 13.18% | 8.37% | 13.18%
OTTI significant inputs - Collateral default rate | 10.53% | 13.94% | 10.53% | 13.94%
OTTI significant inputs - Loss severity rate | 3.72% | 5.79% | 3.72% | 5.79%

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- Definition Marketable Securities, Realized Losses (Recoveries), Other than Temporary Impairments, Amount + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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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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- Details
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- Details
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- Details
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