Employee Benefits (Schedule of net periodic pension (benefit) cost and amounts recognized in other comprehensive income (loss)) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Employee Benefits
Interest cost	$ 335	$ 370
Expected return on plan assets	(529)	(470)
Amortization of unrecognized loss	143	219
Net periodic (benefit) cost	$ (51)	$ 119