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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance at beginning of year $ 245,657 $ 223,726 $ 212,508
Balance at end of year 228,923 245,657 223,726
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance at beginning of year 105 28 24
Change in unamortized net actuarial gain 212 98 5
Related deferred taxes (44) (21) (1)
Net change 168 77 4
Balance at end of year $ 273 $ 105 $ 28