Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Business Combinations Policy: Business Acquisition, InterBank Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
InterBank
Discount Recorded in Conjunction with Fair Value of Acquired Loans and Amount Accreted to Yield	$ 269	$ 359	$ 459