Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Impact of Acquired Loans on Financial Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Details
Impact of Acquired Loan Pools on Interest Income	$ 5,014	$ 16,393	$ 28,531
Impact of acquired loan pools on non-interest income	(634)	(7,033)	(19,534)
Net impact of acquired loan pools to pre-tax income	$ 4,380	$ 9,360	$ 8,997