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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, Beginning of Period $ 1,668,499 $ 1,443,006
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 211 (24)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (9) (63)
Total Other Comprehensive Income (Loss) 202 (87)
Balance, End of Period 1,717,361 1,497,464
Pension and Other Postretirement Benefits    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, Beginning of Period 373 1,375
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (11) (74)
Total Other Comprehensive Income (Loss) (11) (74)
Balance, End of Period 362 1,301
Net Unrealized Gains (Losses) on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, Beginning of Period 159 (227)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 211 (24)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 2 11
Total Other Comprehensive Income (Loss) 213 (13)
Balance, End of Period 372 (240)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, Beginning of Period 532 1,148
Total Other Comprehensive Income (Loss) 202 (87)
Balance, End of Period $ 734 $ 1,061