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Benefit Plans - Change in Projected Benefit Obligation, Change in Fair Value of Plan Assets, and Funded Status of the Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year $ 13,418    
Projected benefit obligation at end of year 11,760 $ 13,418  
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 350,737    
Fair value of plan assets at end of year 385,638 350,737  
Funded status of the plan      
Accumulated benefit obligation 11,760 13,418  
Accrued interest receivable 1,200 986  
Pension      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 170,523 179,918  
Interest cost 8,780 8,542 $ 8,923
Actuarial gain (loss) 5,217 (6,017)  
Benefits paid (13,345) (11,920)  
Projected benefit obligation at end of year 171,175 170,523 179,918
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 351,723 302,860  
Actual return on plan assets 46,816 30,595  
Employer contributions 1,602 30,188  
Benefits paid (13,345) (11,920)  
Fair value of plan assets at end of year 386,796 351,723 302,860
Funded status of the plan      
Assets (liabilities) recognized 215,621 181,200  
Accumulated benefit obligation 171,175 170,523  
OPEB      
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 5,153 5,451  
Interest cost 244 245 279
Actuarial gain (loss) 685 178  
Benefits paid (1,011) (721)  
Projected benefit obligation at end of year 5,071 5,153 5,451
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,011 721  
Benefits paid (1,011) (721)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status of the plan      
Assets (liabilities) recognized (5,071) (5,153)  
Accumulated benefit obligation $ 5,071 $ 5,153