Note 2: Investments in Debt and Equity Securities: Schedule of Financial Instruments Owned and Pledged as Collateral (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Public deposits
Securities Owned and Pledged As Collateral Amortized Cost	$ 459,751	$ 463,832
Security Owned and Pledged as Collateral, Fair Value	473,679	475,622
Collateralized borrowing accocunts
Securities Owned and Pledged As Collateral Amortized Cost	187,700	235,323
Security Owned and Pledged as Collateral, Fair Value	189,862	237,576
Structured repurchase agreements
Securities Owned and Pledged As Collateral Amortized Cost	64,298	65,658
Security Owned and Pledged as Collateral, Fair Value	66,575	67,498
Other Debt Obligations
Securities Owned and Pledged As Collateral Amortized Cost	3,760	1,600
Security Owned and Pledged as Collateral, Fair Value	3,897	1,678
Total securities pledged as collateral
Securities Owned and Pledged As Collateral Amortized Cost	715,509	766,413
Security Owned and Pledged as Collateral, Fair Value	$ 734,013	$ 782,374