Note 21: Stock Compensation Plans: Schedule of Share-based Compensation, Activity (Details) - Employee Stock Option	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	186,750
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 55.282
Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	(81,940)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 27.597
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	(14,373)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 46.081
Options exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	266,742
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 32.233
Share based compensation stock option weighted average remaining contractual term	5.15 years
Balance, Beginning of Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	682,799
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 38.860
Share based compensation stock option weighted average remaining contractual term	7.38 years
Balance, End of Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	773,236
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 43.886
Share based compensation stock option weighted average remaining contractual term	7.44 years