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MBS And Other Investments: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]      
Balance, beginning of year $ 1,654 $ 2,084 $ 2,703
Credit losses for which OTTI was not previously recognized 0 2 7
Additional increases to the amount related to credit loss for which OTTI was previously recognized 13 33 45
Realized losses previously recorded as credit losses (91) (555) (671)
Recovery of prior credit loss 0 90 0
Balance, end of year $ 1,576 $ 1,654 $ 2,084