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, 2017	Dec. 31, 2016	Dec. 31, 2015
Details
Earnings per share net income	$ 51,564	$ 45,342	$ 46,502
Net Income Available to Common Shareholders	$ 51,564	$ 45,342	$ 45,948
Weighted Average Number of Shares Outstanding, Basic	14,032	13,912	13,818
Average common share stock options outstanding	148	229	182
Weighted Average Number of Shares Outstanding, Diluted	14,180	14,141	14,000
Basic	$ 3.67	$ 3.26	$ 3.33
Diluted	$ 3.64	$ 3.21	$ 3.28