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Benefit Plans - Components of Net Periodic Pension Income for Qualified and Non-Qualified Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 8,780 $ 8,542 $ 8,923
Expected return on plan assets (24,426) (22,327) (22,792)
Amortization of net loss (gain) 535 234 58
Amortization of prior service cost 135 135 135
Net periodic benefit (income) cost (14,976) (13,416) (13,676)
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 244 245 279
Expected return on plan assets 0 0 0
Amortization of net loss (gain) (56) (60) (54)
Amortization of prior service cost 0 0 0
Net periodic benefit (income) cost $ 188 $ 185 $ 225