Derivatives and Hedging Activities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Accelerated reclassification gain (loss)	$ (1,500,000)
Interest Expense
Derivative [Line Items]
Gain on derivative	0	$ 0	$ 21,000
Interest Expense | Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Accelerated reclassification gain (loss)	$ (36,000)