Note 2: Investments in Securities: Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities Pledged as Collateral
Securities Owned and Pledged As Collateral Amortized Cost	$ 163,227	$ 197,317
Security Owned and Pledged as Collateral, Fair Value	163,393	199,568
Public deposits
Securities Owned and Pledged As Collateral Amortized Cost	57,841	60,355
Security Owned and Pledged as Collateral, Fair Value	59,082	62,288
Collateralized Loan Obligations
Securities Owned and Pledged As Collateral Amortized Cost	98,787	131,813
Security Owned and Pledged as Collateral, Fair Value	97,498	131,950
Collateralized Securities, Other
Securities Owned and Pledged As Collateral Amortized Cost	6,599	5,149
Security Owned and Pledged as Collateral, Fair Value	$ 6,813	$ 5,330