Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Interbank Acquisition Policy: Business Acquisition, InterBank Assets Acquired and Liabilities Assumed (Details) (InterBank, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 27, 2012
InterBank
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				$ 285,500
Business Combination, Indemnification Assets, Amount as of Acquisition Date				84,000
Discount Recorded in Conjunction with Fair Value of Acquired Loans and Amount Accreted to Yield	$ 544	$ 636	$ 564