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Other Comprehensive Income (Loss) - Summary of Unrealized Gains and Losses on Postretirement Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance at beginning of year $ 243,079 $ 228,923 $ 245,657
Balance at end of year 252,493 243,079 228,923
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance at beginning of year 303 273 105
Change in unamortized net actuarial gain (21) 39 212
Related deferred taxes 5 (9) (44)
Net change (16) 30 168
Balance at end of year $ 287 $ 303 $ 273