Employee Benefits (Schedule of net periodic pension (benefit) cost and amounts recognized in other comprehensive income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Employee Benefits
Interest cost	$ 589	$ 670
Expected return on plan assets	(944)	(1,058)
Amortization of unrecognized loss	359	285
Net periodic cost (benefit)	$ 4	$ (103)