Note 26: Summary of Unaudited Quarterly Operating Results: Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income													$ 51,564	$ 45,342	$ 46,502
Quarterly Operating Results
Interest Income, Operating	$ 46,536	$ 46,368	$ 44,744	$ 45,413	$ 46,937	$ 46,856	$ 45,636	$ 45,746	$ 44,956	$ 45,755	$ 45,734	$ 47,906
Interest Expense Operating	7,263	7,087	6,843	6,712	6,690	5,828	4,974	4,627	4,261	4,230	3,725	3,781
Provision for Other Losses	1,950	2,950	1,950	2,250	2,380	2,500	2,300	2,101	1,216	1,703	1,300	1,300
Net realized gain (losses) and impairment on available for sale securities operating	0	0	0	0	(9)	144	2,735	3	0	2	0	0
Noninterest Income, Other Operating Income	7,374	7,655	15,800	7,698	7,530	7,090	8,916	4,974	5,060	5,120	3,457	(56)
Other Noninterest Expense	29,283	28,034	28,371	28,573	29,043	30,657	29,807	30,920	29,145	30,014	27,949	27,242
Provision for income taxes	3,207	4,289	7,204	4,058	4,560	3,740	4,937	3,279	3,744	3,732	4,214	3,874
Net income	12,207	11,663	16,176	11,518	11,794	11,221	12,534	9,793
Net income available to common shareholders	$ 12,207	$ 11,663	$ 16,176	$ 11,518	$ 11,794	$ 11,221	$ 12,534	$ 9,793	$ 11,531	$ 11,051	$ 11,858	$ 11,508
Earnings per share operating results diluted	$ 0.86	$ 0.82	$ 1.14	$ 0.81	$ 0.83	$ 0.80	$ 0.89	$ 0.70	$ 0.81	$ 0.79	$ 0.85	$ 0.83
Net income from continuing operations results									$ 11,650	$ 11,196	$ 12,003	$ 11,653