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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, 2018
Sep. 30, 2017
Sep. 30, 2016
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 0.00% 0.03% 0.07%
OTTI significant inputs - Loss severity rate 0.00% 1.00% 1.00%
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 10.42% 10.75% 14.45%
OTTI significant inputs - Loss severity rate 75.00% 62.00% 73.00%
Weighted Average      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI significant inputs - Constant prepayment rate 12.91% 10.40% 11.29%
OTTI significant inputs - Collateral default rate 5.03% 4.84% 5.47%
OTTI significant inputs - Loss severity rate 37.25% 41.75% 42.26%