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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 870,966 $ 781,482 $ 728,863
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 1,506 563 534
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 477 (2,633) (2,043)
Stranded Tax Transfer     (784)
Total Other Comprehensive Income (Loss) 1,983 (2,070) (1,509)
Ending balance 990,777 870,966 781,482
Pension and Other Postretirement Benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (8,716) (6,491) (4,059)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 1,638 418 418
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 541 (2,643) (2,056)
Stranded Tax Transfer     (794)
Total Other Comprehensive Income (Loss) 2,179 (2,225) (1,638)
Ending balance (6,537) (8,716) (6,491)
Net Unrealized Gain (Losses) on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 209 54 (85)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax (132) 145 116
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (64) 10 13
Stranded Tax Transfer     10
Total Other Comprehensive Income (Loss) (196) 155 129
Ending balance 13 209 54
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (8,507) (6,437) (4,144)
Total Other Comprehensive Income (Loss) 1,983 (2,070) (1,509)
Ending balance $ (6,524) $ (8,507) $ (6,437)