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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period $ 1,717,361 $ 1,497,464 $ 1,668,499 $ 1,443,006
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 24 (220) 234 (244)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (24) (78) (32) (141)
Total Other Comprehensive Income (Loss) 0 (298) 202 (385)
Balance, End of Period 1,774,462 1,565,652 1,774,462 1,565,652
Pension and Other Postretirement Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 362 1,301 373 1,375
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (12) (29) (23) (103)
Total Other Comprehensive Income (Loss) (12) (29) (23) (103)
Balance, End of Period 350 1,272 350 1,272
Net Unrealized Gains (Losses) on Available-for-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 372 (240) 159 (227)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 24 (220) 234 (244)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (12) (49) (9) (38)
Total Other Comprehensive Income (Loss) 12 (269) 225 (282)
Balance, End of Period 384 (509) 384 (509)
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 734 1,061 532 1,148
Total Other Comprehensive Income (Loss)   (298) 202 (385)
Balance, End of Period $ 734 $ 763 $ 734 $ 763