Note 3: Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	$ 0	$ 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	0
Other than temporary impairment credit losses additions related to increases in previously recognized losses	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows	(6)	(6)
Beginning of period
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held	340	352
End of period
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held	$ 334	$ 346