Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of InterBank FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 InterBank Loans	Apr. 27, 2012 InterBank Loans	Dec. 31, 2012 InterBank Foreclosed Assets	Apr. 27, 2012 InterBank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date			$ 356,844	$ 393,274	$ 2,001	$ 9,908
Non-credit premium (discount), net of activity since acquisition date			2,541	3,105
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)			(9,897)
Original estimated fair value of assets, net of activity since acquisition date			(259,232)	(285,458)	(1,620)	(6,216)
Expected loss remaining			90,256	110,921	381	3,692
Assumed loss sharing recovery percentage			81.00%	81.00%	80.00%	80.00%
Estimated loss sharing value			73,151	89,669	304	2,954
FDIC loss share clawback			1,000
Indemnification assets to be amortized resulting from change in expected losses			7,871
Accretable discount on FDIC indemnification asset			(6,893)	(8,411)	(93)	(223)
FDIC indemnification asset	$ 117,263	$ 108,004	$ 75,129	$ 81,258	$ 211	$ 2,731