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Derivative Financial Instruments - Counterparty Credit Risk and Credit-Risk Related Contingent Features (Details) - USD ($)
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative contracts      
Counterparty credit risk adjustments $ (100,000) $ 0  
Credit-risk-related contingent features      
Aggregate fair value of derivative instruments in a net liability position 12,800,000   $ 4,000,000.0
Collateral posted for derivatives in a net liability position 13,500,000   $ 4,700,000
Interest rate swaps      
Derivative contracts      
Collateral thresholds for derivative agreements with credit risk related contingent features $ 300,000