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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
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

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- Definition

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- Definition

-- None. No documentation exists for this element. --

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+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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