Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Changes in Accretable Yield for Acquired Loan Pools (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
TeamBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (4,138)		$ (9,473)		$ (20,129)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	3,601	[1]	4,747	[1]	17,595	[1]
TeamBank | Balance beginning of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)					14,662
TeamBank | Balance end of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	6,865		7,402		12,128
Vantus Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(3,835)		(8,940)		(21,437)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	2,563	[1]	1,127	[1]	13,008	[1]
Vantus Bank | Balance beginning of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)					21,967
Vantus Bank | Balance end of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	4,453		5,725		13,538
Sun Security Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(10,590)		(16,885)		(15,851)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	7,429	[1]	16,739	[1]	14,341	[1]
Sun Security Bank | Balance beginning of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)					12,769
Sun Security Bank | Balance end of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	7,952		11,113		11,259
InterBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions					46,078
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(37,994)		(28,667)		(11,998)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	33,991	[1]	26,188	[1]	8,494	[1]
InterBank | Balance end of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	36,092		40,095		42,574
Valley Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions	22,976
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(4,788)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	(7,056)	[1]
Valley Bank | Balance end of period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	$ 11,132

[1] Represents increases in estimated cash flows expected to be received from the acquired loan pools, primarily due to lower estimated credit losses. The numbers also include changes inexpected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2014, totaling $3.2 million, $2.4 million, $3.9 million, $9.2 million and $(9.6 million), respectively; for TeamBank, Vantus Bank, Sun Security Bank and InterBank for the year ended December 31, 2013, totaling $2.3 million, $611,000, $4.8 million and $146,000, respectively; and for TeamBank, Vantus Bank, Sun Security Bank and InterBank for the year ended December 31, 2012, totaling $5.2 million, $4.4 million, $3.6 million and $2.4 million, respectively.