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Derivatives - Narrative (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash $ 0  
Total derivative assets 24,100,000 $ 900,000
Derivative, Collateral, Right to Reclaim Securities $ 0 0
Derivative, Collateral, Obligation to Return Securities   $ 0