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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - Fair value hedge - Designated as hedging instrument
$ in Thousands
Sep. 30, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
Derivatives, Fair Value [Line Items]    
Interest rate swaps accrued interest | $ $ 13 $ 6
Interest rate swap    
Derivatives, Fair Value [Line Items]    
Number of instruments held | derivative 5