Derivative Instruments and Hedging Activities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) InterestRateDerivative	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Estimated to be reclassified as an increase to interest expense during next twelve months	$ 114,000
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount	$ 50,000,000	$ 100,000,000
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge of Interest Rate Risk [Member]
Derivative [Line Items]
Number of months hedging exposure to variability in future cash flows for forecasted transactions	60 months
Number of outstanding forward starting interest rate Derivative | InterestRateDerivative	1
Notional amount	$ 50,000,000.0
Derivative effective date	2022-04