Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Vantus Bank Acquisition Policy: Business Acquisition, Vantus Bank Assets Acquired and Liabilities Assumed (Details) (Vantus Bank, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 04, 2009
Vantus Bank
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				$ 247,000
Business Combination, Indemnification Assets, Amount as of Acquisition Date				62,200
Discount Recorded in Conjunction with Fair Value of Acquired Loans and Amount Accreted to Yield	$ 0	$ 104	$ 399