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MBS And Other Investments: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status $ (28) $ (17)    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 1,548 $ 1,637 $ 1,576 $ 1,654