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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) | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Minimum |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 0.03% | 0.07% | 0.16%
OTTI significant inputs - Loss severity rate | 1.00% | 1.00% | 3.92%
Maximum |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 10.75% | 14.45% | 14.65%
OTTI significant inputs - Loss severity rate | 62.00% | 73.00% | 65.00%
Weighted Average |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |
OTTI significant inputs - Constant prepayment rate | 10.40% | 11.29% | 11.49%
OTTI significant inputs - Collateral default rate | 4.84% | 5.47% | 6.08%
OTTI significant inputs - Loss severity rate | 41.75% | 42.26% | 39.83%

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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