Note 16: Derivatives and Hedging Activities: Agreements with Derivative Counterparties (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Balance Sheet Hedge
Derivative Counterparties Collateral	$ 6.7	$ 30.9
Net Liability Position | Loan Level Swap | Commercial Lending Customer
Termination Value of Derivatives With Derivative Dealer Counterparties	$ 6.7	1.1
Net Asset Position | Balance Sheet Hedge
Termination Value of Derivatives With Derivative Dealer Counterparties		$ 30.1