Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Components of Net Periodic Pension Cost
Interest cost on projected benefit obligation	$ 703	$ 891
Expected return on plan assets	(716)	(972)
Net amortization	248	384
Settlement Charge	749	0
Net Periodic Pension Expense	$ 984	$ 303