Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: FDIC Indemnification Asset Policy (Details)	12 Months Ended
	Dec. 31, 2018
TeamBank
Business Combination, Indemnification Assets, Description	Through December 31, 2018, gross loan balances (due from borrowers) were reduced approximately $425.6 million since the transaction date because of $293.0 million of repayments by the borrowers, $61.7 million of transfers to foreclosed assets and $70.9 million of charge-downs to customer loan balances
Vantus Bank
Business Combination, Indemnification Assets, Description	Through December 31, 2018, gross loan balances (due from borrowers) were reduced approximately $317.5 million since the transaction date because of $271.9 million of repayments by the borrowers, $16.7 million of transfers to foreclosed assets and $28.9 million of charge-downs to customer loan balances.
Sun Security Bank
Business Combination, Indemnification Assets, Description	Through December 31, 2018, gross loan balances (due from borrowers) were reduced approximately $213.3 million since the transaction date because of $153.9 million of repayments by the borrowers, $28.6 million of transfers to foreclosed assets and $30.8 million of charge-downs to customer loan balances.
InterBank
Business Combination, Indemnification Assets, Description	Through December 31, 2018, gross loan balances (due from borrowera) were reduced approximately $308.2 million since the transaction date because of $265.8 million of repayments by the borrowers, $20.0 million of transfers to foreclosed assets and $22.4 million of charge-offs to customer loan balances.
Valley Bank
Business Combination, Indemnification Assets, Description	Through December 31, 2018, gross loan balances (due from borrowera) were reduced approximately $139.7 million since the transaction date because of $127.7 million of repayments by the borrowers, $4.0 million of transfers to foreclosed assets and $8.0 million of charge-offs to customer loan balances.