Note 7: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: FDIC Indemnification Asset Policy (Details)	3 Months Ended
	Mar. 31, 2017
TeamBank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $419.8 million since the transaction date because of $287.0 million of repayments from borrowers, $61.7 million in transfers to foreclosed assets and $71.1 million in charge-offs to customer loan balances.
Vantus Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $309.2 million since the transaction date because of $263.4 million of repayments from borrowers, $16.7 million in transfers to foreclosed assets and $29.1 million in charge-offs to customer loan balances.
Sun Security Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $202.7 million since the transaction date because of $143.4 million of repayments from borrowers, $28.4 million in transfers to foreclosed assets and $30.9 million of charge-offs to customer loan balances.
InterBank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $254.5 million since the transaction date because of $213.6 million of repayments by the borrower, $18.0 million in transfers to foreclosed assets and $22.9 million of charge-offs to customer loan balances.
Valley Bank
Business Combination, Indemnification Assets, Description	Gross loan balances (due from the borrower) were reduced by approximately $118.2 million since the transaction date because of $106.6 million of repayments by the borrower, $3.8 million in transfers to foreclosed assets and $7.8 million of charge-offs to customer loan balances.