Note 4: Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic
Weighted Average Number of Shares Outstanding, Basic	14,027	13,899	14,010	13,900
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 16,176	$ 12,534	$ 27,695	$ 22,327
BASIC EARNINGS PER COMMON SHARE	$ 1.15	$ 0.90	$ 1.98	$ 1.61
Earnings Per Share, Diluted
Weighted Average Number of Shares Outstanding, Diluted	14,027	13,899	14,010	13,900
Net effect of dilutive stock options - based on the treasury stock method using average market price	179	121	179	124
Weighted Average Number Diluted Shares Outstanding Adjustment	14,206	14,020	14,189	14,024
Net Income (Loss) Available to Common Stockholders, Diluted	$ 16,176	$ 12,534	$ 27,695	$ 22,327
DILUTED EARNINGS PER COMMON SHARE	$ 1.14	$ 0.89	$ 1.95	$ 1.59