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Derivative Financial Instruments - Net Gains (Losses) Recorded in Accumulated Other Comprehensive Income (Loss) (Details) - Interest rate contract - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Cash pledged to secure obligations $ 3,500   $ 3,500   $ 300
Cash Flow Hedging          
Derivative [Line Items]          
Amount of (gain) loss recognized in OCI 14 $ (598) (2,233) $ (598)  
Amount of (gain) loss reclassified from OCI to interest expense $ 192 $ 6 $ 42 $ 6