Note 21: Stock Option Plan: Schedule of Share-based Compensation, Stock Options, Activity (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.227
Granted
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, Weighted Average Exercise Price	$ 19.488
Stock Option | Balance beginning of period
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			524,510
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options			730,186
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 23.215
Stock Option | Granted
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	(105,200)	(120,100)	(88,190)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	105,200	120,100	88,190
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.759	$ 19.349	$ 22.105
Stock Option | Exercised
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	(116,479)	(25,856)	(47,597)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 19.488	$ 12.053	$ 14.088
Stock Option | Forfeited from terminated plan(s)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options		(4,000)	(850)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 12.898	$ 7.785
Stock Option | Forfeited from current plan(s)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	64,482	24,987	26,133
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	(64,482)	(24,987)	(26,133)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 23.168	$ 23.349	$ 25.916
Stock Option | Balance end of period
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	326,622	367,340	462,453
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options	733,292	809,053	743,796
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 24.227	$ 23.391	$ 23.592