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Derivative Financial Instruments - Effect of Interest Rate Swaps (Details) - Interest rate swaps - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ 227 $ 55
Interest Expense    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ (26) $ 55