Note 1: Nature of Operations and Summary of Significant Accounting Policies: Earnings Per Share, Policy: Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Details
Net income and net income available to common shareholders	$ 67,109	$ 51,564	$ 45,342
Weighted Average Number of Shares Outstanding, Basic	14,132	14,032	13,912
Average common share stock options outstanding	128	148	229
Weighted Average Number of Shares Outstanding, Diluted	14,260	14,180	14,141
Basic	$ 4.75	$ 3.67	$ 3.26
Diluted	$ 4.71	$ 3.64	$ 3.21