Note 7: Acquired Loans, Loss Sharing Agreements and Fdic Indemnification Assets (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Sun Security Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $204.0 million since the transaction date because of $144.6 million of repayments from borrowers, $28.5 million in transfers to foreclosed assets and $30.9 million of charge-offs to customer loan balances.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (574)		$ (979)		$ (1,196)		$ (2,051)
Change in expected accretable yield	465	[1]	670	[1]	605	[2]	1,141	[2]
Sun Security Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	3,795		5,323		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)	$ 3,686		5,014		3,686		5,014
InterBank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $264.9 million since the transaction date because of $223.3 million of repayments by the borrower, $18.9 million in transfers to foreclosed assets and $22.7 million of charge-offs to customer loan balances.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (1,885)		(3,475)		(4,162)		(8,116)
Change in expected accretable yield	389	[1]	738	[1]	1,064	[2]	3,587	[2]
InterBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	6,910		14,555		8,512		16,347
InterBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	$ 5,414		11,818		5,414		11,818
TeamBank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $420.8 million since the transaction date because of $288.0 million of repayments from borrowers, $61.7 million in transfers to foreclosed assets and $71.1 million in charge-offs to customer loan balances.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (312)		(550)		(967)		(1,031)
Change in expected accretable yield	119	[1]	(50)	[1]	793	[2]	112	[2]
TeamBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	2,496		3,486		2,477		3,805
TeamBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	$ 2,303		2,886		2,303		2,886
Vantus Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $310.4 million since the transaction date because of $264.6 million of repayments from borrowers, $16.7 million in transfers to foreclosed assets and $29.1 million in charge-offs to customer loan balances.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (383)		(502)		(739)		(991)
Change in expected accretable yield	209	[1]	483	[1]	372	[2]	848	[2]
Vantus Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	2,354		3,236		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)	$ 2,180		3,217		2,180		3,217
Valley Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $121.3 million since the transaction date because of $109.7 million of repayments by the borrower, $3.9 million in transfers to foreclosed assets and $7.7 million of charge-offs to customer loan balances.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (1,470)		(2,717)		(3,394)		(5,863)
Change in expected accretable yield	383	[1]	1,009	[1]	1,910	[2]	4,071	[2]
Valley Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	4,400		8,232		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)	$ 3,313		$ 6,524		$ 3,313		$ 6,524

[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 June 30, 2017, totaling $119,000, $209,000, $465,000, $389,000 and $383,000, respectively, and for the three months ended June 30, 2016, totaling $(50,000), $483,000, $670,000, $538,000 and $484,000, respectively.

[2] 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 six months ended June 30, 2017, totaling $793,000, $367,000, $605,000, $1.1 million and $1.8 million, respectively, and for the six months ended June 30, 2016, totaling $112,000, $848,000, $974,000, $1.2 million and $1.1 million, respectively.