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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 990,777 $ 870,966 $ 781,482
Other Comprehensive Income Before Reclassifications, net of tax 6,898 1,506 563
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 541 477 (2,633)
Total Other Comprehensive Income (Loss) 7,439 1,983 (2,070)
Ending balance 1,217,317 990,777 870,966
Pension and Other Postretirement Benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6,537) (8,716) (6,491)
Other Comprehensive Income Before Reclassifications, net of tax 7,331 1,638 418
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 540 541 (2,643)
Total Other Comprehensive Income (Loss) 7,871 2,179 (2,225)
Ending balance 1,334 (6,537) (8,716)
Net Unrealized Gain (Losses) on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 13 209 54
Other Comprehensive Income Before Reclassifications, net of tax (433) (132) 145
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 1 (64) 10
Total Other Comprehensive Income (Loss) (432) (196) 155
Ending balance (419) 13 209
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6,524) (8,507) (6,437)
Total Other Comprehensive Income (Loss) 7,439 1,983 (2,070)
Ending balance $ 915 $ (6,524) $ (8,507)