Derivative Instruments and Hedging Activities - Interest Rate Derivatives Designated as Hedges (Details) - Fair value hedge - Derivatives designated as hedging instruments - Interest rate swaps - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Carrying Amount of the Hedged Asset	$ 7,138	$ 7,510
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset	$ 59	$ 229