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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period $ 1,774,462 $ 1,565,652 $ 1,668,499 $ 1,443,006
Other Comprehensive Income Before Reclassifications, net of tax 37 1,233 272 989
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (29) (17) (62) (158)
Total Other Comprehensive Income (Loss) 8 1,216 210 831
Balance, End of Period 1,831,451 1,633,331 1,831,451 1,633,331
Pension and Other Postretirement Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 350 1,271 373 1,375
Other Comprehensive Income Before Reclassifications, net of tax 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (12) (28) (35) (132)
Total Other Comprehensive Income (Loss) (12) (28) (35) (132)
Balance, End of Period 338 1,243 338 1,243
Net Unrealized Gains (Losses) on Available-for-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 384 (508) 159 (227)
Other Comprehensive Income Before Reclassifications, net of tax 37 1,233 272 989
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (17) 11 (27) (26)
Total Other Comprehensive Income (Loss) 20 1,244 245 963
Balance, End of Period 404 736 404 736
Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 734 763 532 1,148
Total Other Comprehensive Income (Loss) 8 1,216 210 831
Balance, End of Period $ 742 $ 1,979 $ 742 $ 1,979