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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, 2020
Sep. 30, 2019
Sep. 30, 2018
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 2.17% 3.00% 0.00%
OTTI significant inputs - Loss severity rate 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%
OTTI significant inputs - Collateral default rate 27.39% 19.70% 10.42%
OTTI significant inputs - Loss severity rate 11.27% 10.59% 75.00%
Weighted Average      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI significant inputs - Constant prepayment rate 8.97% 10.67% 12.91%
OTTI significant inputs - Collateral default rate 14.37% 10.40% 5.03%
OTTI significant inputs - Loss severity rate 2.87% 4.07% 37.25%