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Employee Benefit Plans - Schedule of Net Periodic Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Components of Net Periodic Benefits Cost:        
Service cost $ 721 $ 792 $ 2,163 $ 2,492
Interest cost 2,691 2,580 8,073 7,680
Expected return on plan assets (3,181) (3,004) (9,543) (9,022)
Amortization of prior service cost 109 109 327 326
Amortization of actuarial (gain) loss 0 0 0 0
Net periodic benefits costs under accounting standards 340 477 1,020 1,476
Other Postretirement Benefits        
Components of Net Periodic Benefits Cost:        
Service cost 27 32 81 96
Interest cost 23 25 68 74
Expected return on plan assets (161) (142) (483) (426)
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (291) (278) (874) (834)
Net periodic benefits costs under accounting standards (402) (363) (1,208) (1,090)
SERP        
Components of Net Periodic Benefits Cost:        
Service cost 181 358 542 1,074
Interest cost 485 426 1,455 1,278
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss 0 (4) 0 (11)
Net periodic benefits costs under accounting standards $ 666 $ 780 $ 1,997 $ 2,341