v3.26.1
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period $ 1,907,792 $ 1,717,361 $ 1,861,760 $ 1,668,499
Other Comprehensive Income Before Reclassifications, net of tax (121) 24 (333) 234
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (5) (24) 6 (32)
Total Other Comprehensive Income (Loss) (126) 0 (327) 202
Balance, End of Period 1,876,871 1,774,462 1,876,871 1,774,462
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 269 734 470 532
Total Other Comprehensive Income (Loss) (126) 0 (327) 202
Balance, End of Period 143 734 143 734
Pension and Other Postretirement Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 70 362 70 373
Other Comprehensive Income Before Reclassifications, net of tax 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 (12) 0 (23)
Total Other Comprehensive Income (Loss) 0 (12) 0 (23)
Balance, End of Period 70 350 70 350
Net Unrealized Gains (Losses) on Available-for-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, Beginning of Period 199 372 400 159
Other Comprehensive Income Before Reclassifications, net of tax (121) 24 (333) 234
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (5) (12) 6 (9)
Total Other Comprehensive Income (Loss) (126) 12 (327) 225
Balance, End of Period $ 73 $ 384 $ 73 $ 384