Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Vantus Bank FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
FDIC indemnification asset	$ 117,263	$ 108,004
Vantus Bank | Loans
Initial basis for loss sharing determination, net of activity since acquisition date	103,910	149,215
Non-credit premium (discount), net of activity since acquisition date	(104)	(503)
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(5,429)	(11,267)
Original estimated fair value of assets, net of activity since acquisition date	(95,483)	(123,036)
Expected loss remaining	2,894	14,409
Assumed loss sharing recovery percentage	78.00%	80.00%
Estimated loss sharing value	2,270	11,526
Indemnification assets to be amortized resulting from change in expected losses	4,343	9,014
Accretable discount on FDIC indemnification asset	(240)	(1,946)
FDIC indemnification asset	6,373	18,594
Vantus Bank | Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	4,383	3,410
Original estimated fair value of assets, net of activity since acquisition date	(3,214)	(2,069)
Expected loss remaining	1,169	1,341
Assumed loss sharing recovery percentage	80.00%	80.00%
Estimated loss sharing value	935	1,073
FDIC indemnification asset	$ 935	$ 1,073