Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Business Combination Accretable Yield (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Details
Increase in accretable yield due to increased cash flow expectations	$ 1,333	$ 10,598	$ 13,720
Decrease in FDIC indemnification asset as a result of accretable yield increase	$ 0	$ (2,744)	$ (5,056)