Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of net periodic benefit costs:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			7.00%
Pension Benefits
Components of net periodic benefit costs:
Interest cost	$ 67	$ 82	$ 134	$ 176
Expected return on plan assets	(175)	(190)	(349)	(390)
Amortization of net loss	32	36	63	66
Settlement charge	0	151	0	519
Net periodic benefit/cost	$ (76)	79	$ (152)	371
Defined Benefit Plan, Plan Assets, Payment for Settlement		$ (151)		$ (519)
Other Postretirement Benefits Plan [Member] | Employees Hired before January 1, 2003
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit based on highest average salary for number of consecutive years			5 years
Number of years for consecutive years calculation			10 years
Other Postretirement Benefits Plan [Member] | Employees Hired on or after January 1, 2003
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Percent of annual salary to calculate benefit			2.00%