Derivatives and Hedging Activities, Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - Interest Rate Swaps [Member] - Designated as Hedging Instrument [Member] - Cash Flow Hedges [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income [Member]
Derivatives and Hedging Activities [Abstract]
Gain (loss) reclassified from accumulated other comprehensive loss into income	$ (38)	$ 0	$ (65)	$ 0
Other Comprehensive Loss [Member]
Derivatives and Hedging Activities [Abstract]
Gain or (loss) recognized in OCI	$ (778)	$ 0	$ 3,101	$ 0