Note 17: Derivatives and Hedging Activities: Nondesignated Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 28	$ 66	$ (43)
Interest Rate Swap | Not Designated as Hedging Instrument | Commercial Customers
Derivative, Notional Amount	$ 110,700