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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]        
Service cost $ 248 $ 179 $ 744 $ 537
Interest cost on projected benefit obligation 451 639 1,353 1,917
Expected return on plan assets (1,289) (1,255) (3,867) (3,765)
Net amortization and deferral 832 705 2,496 2,115
Net periodic pension cost $ 242 268 $ 726 804
Defined Benefit Plan, Non-service cost   $ 100   $ 300