NOTE 7: ACQUIRED LOANS, LOSS SHARING AGREEMENTS AND FDIC INDEMNIFICATION ASSETS: Loss Sharing Agreement Policy (Details) - USD ($) $ in Thousands			9 Months Ended
	Jun. 09, 2017	Apr. 26, 2016	Sep. 30, 2018	Sep. 30, 2017
Cash Received from FDIC Loss Sharing Reimbursements			$ 0	$ 16,245
Gain Realized on Termination of Loss Sharing Agreements			$ 0	$ 7,704
TeamBank
Cash Received from FDIC Loss Sharing Reimbursements		$ 4,400
Vantus Bank
Cash Received from FDIC Loss Sharing Reimbursements		4,400
Sun Security Bank
Cash Received from FDIC Loss Sharing Reimbursements		$ 4,400
InterBank
Cash Received from FDIC Loss Sharing Reimbursements	$ 15,000
Gain Realized on Termination of Loss Sharing Agreements	$ 7,700