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Employee Benefit Plans - Schedule of Net Periodic Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Components of Net Periodic Benefits Cost:        
Regulatory adjustment - deferred     $ (14,065) $ (8,319)
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 1,411 $ 1,487 4,233 4,737
Interest cost 1,850 1,700 5,550 5,124
Expected return on plan assets (3,291) (3,137) (9,873) (9,405)
Amortization of prior service cost 109 109 327 327
Amortization of actuarial (gain) loss 0 876 0 2,862
Net periodic benefits costs under accounting standards 79 1,035 237 3,645
Regulatory adjustment - deferred 0 (254) 0 (956)
Total expense (benefit) recognized, before surcharges and allocation to overhead pool 79 781 237 2,689
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 30 31 96 111
Interest cost 13 22 45 84
Expected return on plan assets (147) (134) (441) (402)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (478) (488) (1,302) (1,062)
Net periodic benefits costs under accounting standards (582) (569) (1,602) (1,269)
Regulatory adjustment - deferred 0 0 0 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool (582) (569) (1,602) (1,269)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 298 348 894 1,044
Interest cost 256 229 768 687
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss 145 419 435 1,257
Net periodic benefits costs under accounting standards 699 996 2,097 2,988
Regulatory adjustment - deferred 0 0 0 0
Total expense (benefit) recognized, before surcharges and allocation to overhead pool $ 699 $ 996 $ 2,097 $ 2,988