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Employee Benefit Plans - Schedule of Net Periodic Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Components of Net Periodic Benefits Cost:        
Regulatory adjustment - deferred     $ (8,404) $ (8,802)
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,342 $ 1,625 2,822 3,250
Interest cost 1,856 1,712 3,700 3,424
Expected return on plan assets (3,290) (3,134) (6,582) (6,268)
Amortization of prior service cost 109 109 218 218
Amortization of actuarial (gain) loss 0 993 0 1,986
Net periodic benefits costs under accounting standards 17 1,305 158 2,610
Regulatory adjustment - deferred 0 (351) 0 (702)
Total expense (benefit) recognized, before surcharges and allocation to overhead pool 17 954 158 1,908
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 33 40 66 80
Interest cost 16 31 32 62
Expected return on plan assets (147) (134) (294) (268)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (412) (287) (824) (574)
Net periodic benefits costs under accounting standards (510) (350) (1,020) (700)
Regulatory adjustment - deferred 0 0 0 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool (510) (350) (1,020) (700)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 298 348 596 696
Interest cost 256 229 512 458
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss 145 419 290 838
Net periodic benefits costs under accounting standards 699 996 1,398 1,992
Regulatory adjustment - deferred 0 0 0 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool $ 699 $ 996 $ 1,398 $ 1,992