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Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Accretable Yield for Acquired Loan Pools (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
TeamBank
      
Acquired Loan Pools Accretable Yield Beginning of Period     $ 31,300
Acquired Loan Pools Accretable Yield Accretion (20,129) (40,010) (24,250)
Acquired Loan Pools Accretable Yield Reclassification from Nonaccretable Difference 17,595 [1] 17,907 [1] 29,715 [1]
Acquired Loan Pools Accretable Yield End of Period 12,128 14,662 36,765
Vantus Bank
      
Acquired Loan Pools Accretable Yield Beginning of Period     39,023
Acquired Loan Pools Accretable Yield Accretion (21,437) (30,908) (23,848)
Acquired Loan Pools Accretable Yield Reclassification from Nonaccretable Difference 13,008 [1] 17,079 [1] 20,621 [1]
Acquired Loan Pools Accretable Yield End of Period 13,538 21,967 35,796
Sun Security Bank
      
Acquired Loan Pools Accretable Yield Accretion (15,851) (2,221)  
Acquired Loan Pools Accretable Yield Reclassification from Nonaccretable Difference 14,341 [1]    
Acquired Loan Pools Accretable Yield End of Period 11,259 12,769  
Acquired Loan Pools Accretable Yield Additions   14,990  
InterBank
      
Acquired Loan Pools Accretable Yield Accretion (11,998)    
Acquired Loan Pools Accretable Yield Reclassification from Nonaccretable Difference 8,494 [1]    
Acquired Loan Pools Accretable Yield End of Period 42,574    
Acquired Loan Pools Accretable Yield Additions $ 46,078    
[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 and InterBank for the year ended December 31, 2012, totaling $5.2 million, $4.4 million, $3.6 million and $2.4 million, respectively; for TeamBank and Vantus Bank for the year ended December 31, 2011, totaling $3.5 million and $4.4 million, respectively; and for TeamBank and Vantus Bank for the year ended December 31, 2010, totaling $1.8 million and $6.8 million, respectively.