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, 2013	Sep. 30, 2012	Sep. 30, 2011
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	0.73%	0.06%	0.43%
OTTI significant inputs - Loss severity rate	20.48%	0.52%	11.93%
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	22.53%	28.40%	24.23%
OTTI significant inputs - Loss severity rate	75.02%	76.03%	64.54%
Weighted Average
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
OTTI significant inputs - Constant prepayment rate	12.33%	8.77%	10.71%
OTTI significant inputs - Collateral default rate	7.84%	8.74%	8.03%
OTTI significant inputs - Loss severity rate	52.69%	48.28%	39.22%