Employee Benefits (Schedule of net periodic pension (benefit) cost and amounts recognized in other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Employee Benefits
Interest cost	$ 158	$ 147
Expected return on plan assets	(252)	(236)
Amortization of unrecognized loss	67	90
Net periodic (benefit) cost	$ (27)	$ 1