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Note 4: Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Details        
Weighted Average Number of Shares Outstanding, Basic 13,914 13,840 13,906 13,815
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS $ 11,221 $ 11,051 $ 33,548 $ 34,417
BASIC EARNINGS PER COMMON SHARE $ 0.81 $ 0.80 $ 2.41 $ 2.49
Weighted Average Number of Shares Outstanding, Diluted 13,914 13,840 13,906 13,815
Net effect of dilutive stock options - based on the treasury stock method using average market price 140 178 140 178
Weighted Average Number Diluted Shares Outstanding Adjustment 14,054 14,018 14,046 13,993
Net Income (Loss) Available to Common Stockholders, Diluted $ 11,221 $ 11,051 $ 33,548 $ 34,417
DILUTED EARNINGS PER COMMON SHARE $ 0.80 $ 0.79 $ 2.39 $ 2.46