Note 21: Stock Option Plan: Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	733,292
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.227
Options outstanding beginning of period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	809,053
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.391
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5.43
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	105,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.759
Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	(116,479)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 19.488
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	(64,482)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.168
Options outstanding end of period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	733,292
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.227
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5.34
Options exercisable end of period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	432,589
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 26.163
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	2.97