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Note 2: Investments in Securities: Schedule of Financial Instruments Owned and Pledged as Collateral (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Public Deposit    
Securities Owned and Pledged As Collateral Amortized Cost $ 8,578 $ 9,482
Security Owned and Pledged as Collateral, Fair Value 8,913 9,802
Collateralized Borrowing Accounts    
Securities Owned and Pledged As Collateral Amortized Cost 122,771 148,050
Security Owned and Pledged as Collateral, Fair Value 129,643 146,337
Other Pledged Securities    
Securities Owned and Pledged As Collateral Amortized Cost 7,021 763
Security Owned and Pledged as Collateral, Fair Value 7,107 761
Securities Pledged as Collateral    
Securities Owned and Pledged As Collateral Amortized Cost 138,370 158,295
Security Owned and Pledged as Collateral, Fair Value $ 145,663 $ 156,900