Derivative Instruments and Hedging Activities Derivative Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest Rate Swap No. 2 [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, term of contract	5 years	5 years
Fair value of interest rate derivatives		$ 135
Unrealized gain (loss) on interest rate cash flow hedges	$ (121)	$ (64)
Interest Rate Swap No. 1 [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative, term of contract	10 years	10 years
Fair value of interest rate derivatives	$ (1,054)	$ (70)
Unrealized gain (loss) on interest rate cash flow hedges	60	133
Interest Rate Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Fair value of interest rate derivatives	(1,054)	65
Unrealized gain (loss) on interest rate cash flow hedges	$ (61)	$ 69