Note 21: Stock Compensation Plans: Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Options outstanding and exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	682,799
Share based compensation stock option weighted average remaining contractual term	7.38 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 38.860
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	240,862
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 27.884
Range of Exercise Prices | $8.360 to $19.530
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	48,152
Share based compensation stock option weighted average remaining contractual term	3.56 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 17.884
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	48,152
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 17.884
Range of Exercise Prices | $21.320 to $24.820
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	77,890
Share based compensation stock option weighted average remaining contractual term	4.09 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 23.760
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	77,740
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 23.760
Range of Exercise Prices | $26.640 to $29.640
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	73,833
Share based compensation stock option weighted average remaining contractual term	5.95 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 29.491
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	50,374
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 29.493
Range of Exercise Prices | $32.590 to $38.610
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	109,313
Share based compensation stock option weighted average remaining contractual term	6.86 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 33.029
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	41,902
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 32.751
Range of Exercise Prices | $41.300 to $47.800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	121,200
Share based compensation stock option weighted average remaining contractual term	8.80 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 41.370
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	325
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 47.800
Range of Exercise Prices | $50.710 to $52.200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	252,411
Share based compensation stock option weighted average remaining contractual term	9.07 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 51.582
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	22,369
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 50.710