Note 21: Stock Compensation Plans: Schedule of Nonvested Share Activity (Details) - Employee Stock Option	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Nonvested options | Balance, Beginning of Period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	441,937
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price	$ 44.842
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value	$ 7.981
Nonvested options | Balance, End of Period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	506,494
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price	$ 50.023
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value	$ 8.431
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	186,750
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price	$ 55.282
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value	$ 8.297
Vested this period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	(107,895)
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price	$ 38.433
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value	$ 6.398
Nonvested options forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	(14,298)
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Exercise Price	$ 46.057
Share Based Compensation Arrangement by Share Based Payment Award Nonvested Weighted Average Grant Date Fair Value	$ 8.143