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Derivatives - Gross and Net Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivative Asset Positions    
Gross position - asset / (liability) $ 0 $ 127
Netting adjustment 0 (127)
Net position - asset / (liability) 0 0
Derivative Liability Positions    
Gross position - asset / (liability) 0 (451)
Netting adjustment 0 127
Net position - asset / (liability) $ 0 $ (324)