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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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
TeamBank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion $ (1,563) $ (1,834) $ (3,265)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference [1] 1,157 506 205  
TeamBank | End of Period        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 2,071 2,477 3,805 $ 6,865
Vantus Bank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (1,373) (1,877) (2,541)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference [1] 676 1,064 1,448  
Vantus Bank | End of Period        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 1,850 2,547 3,360 4,453
Sun Security Bank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (2,251) (3,832) (5,487)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference [1] 875 2,185 3,459  
Sun Security Bank | End of Period        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 2,901 4,277 5,924 7,952
InterBank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (7,505) (13,964) (28,767)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference [1] 4,067 6,129 9,022  
InterBank | End of Period        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) 5,074 8,512 16,347 36,092
Valley Bank        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion (5,823) (11,933) (10,975)  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference [1] 3,721 8,414 8,159  
Valley Bank | End of Period        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) $ 2,695 $ 4,797 $ 8,316 $ 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 in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2017, totaling $1.1 million, $663,000, $850,000, $3.5 million and $3.0 million, respectively; for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2016, totaling $506,000, $1.0 million, $1.8 million, $2.7 million and $1.6 million, respectively; and for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2015, totaling $40,000, $1.1 million, $2.0 million, $4.8 million and $759,000, respectively.