Note 7: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Accretable Yield Changes for Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
TeamBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion		$ (655)	$ (480)
Change in expected accretable yield	[1]	674	161
TeamBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		2,477	3,805
TeamBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		2,496	3,486
Vantus Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion		(356)	(489)
Change in expected accretable yield	[1]	163	365
Vantus Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		2,547	3,360
Vantus Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		2,354	3,236
Sun Security Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion		(622)	(1,072)
Change in expected accretable yield	[1]	140	471
Sun Security Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		4,277	5,924
Sun Security Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		3,795	5,323
InterBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion		(2,278)	(4,641)
Change in expected accretable yield	[1]	676	2,849
InterBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		8,512	16,347
InterBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		6,910	14,555
Valley Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion		(1,925)	(3,146)
Change in expected accretable yield	[1]	1,528	3,062
Valley Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		4,797	8,316
Valley Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)		$ 4,400	$ 8,232

[1] Represents increases in estimated cash flows expected to be received from the acquired loan pools, partially due to lower estimated credit losses. The amounts also include changes in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the three months ended March 31, 2017, totaling $674,000, $158,000, $140,000, $676,000 and $1.4 million, respectively, and for the three months ended March 31, 2016, totaling $161,000, $365,000, $304,000, $690,000 and $612,000, respectively.