Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year			$ 250
Post-Retirement Health Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year			$ 248
Service cost	$ 8	$ 11
Interest cost	28	26
Expected return on plan assets	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0
Net amortization of net (gain) loss	0	0
Net Periodic Benefit Cost	36	37
Defined Benefit Plan, Plan Assets, Contributions by Employer	57
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	297	339
Interest cost	706	658
Expected return on plan assets	(1,227)	(1,178)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0
Net amortization of net (gain) loss	315	518
Net Periodic Benefit Cost	91	$ 337
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 32