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Pension Plan and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Net Periodic Benefit Cost $ 1,479 $ 2,841
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 1,644 1,866
Interest Cost 3,086 2,915
Expected Return on Assets (5,921) (5,590)
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 1,966 2,728
Net Periodic Benefit Cost 775 1,919
Executive Survivor and Supplemental Retirement Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 49 47
Interest Cost 335 307
Expected Return on Assets 0 0
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 142 155
Net Periodic Benefit Cost 526 509
Other Postretirement Benefits Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 335 430
Interest Cost 510 473
Expected Return on Assets 0 0
Amortization of Prior Service Cost (1,433) (1,433)
Amortization of Net Actuarial Loss 766 943
Net Periodic Benefit Cost $ 178 $ 413