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MBS And Other Investments: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details)
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
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 0.16% 0.01% 0.73%
OTTI significant inputs - Loss severity rate 3.92% 0.16% 20.48%
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 14.65% 22.34% 22.53%
OTTI significant inputs - Loss severity rate 65.00% 75.17% 75.02%
Weighted Average      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
OTTI significant inputs - Constant prepayment rate 11.49% 10.59% 12.33%
OTTI significant inputs - Collateral default rate 6.08% 7.41% 7.84%
OTTI significant inputs - Loss severity rate 39.83% 45.81% 52.69%