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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,497,464 $ 1,263,777 $ 1,443,006 $ 1,217,317
Other Comprehensive Income (Loss) Before Reclassifications, net of tax (220) (62) (244) 18
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (78) (26) (141) (52)
Total Other Comprehensive Income (Loss) (298) (88) (385) (34)
Ending balance 1,565,652 1,328,439 1,565,652 1,328,439
Pension and Other Postretirement Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 1,301 1,308 1,375 1,334
Other Comprehensive Income (Loss) Before Reclassifications, net of tax 0 0 0 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (29) (27) (103) (53)
Total Other Comprehensive Income (Loss) (29) (27) (103) (53)
Ending balance 1,272 1,281 1,272 1,281
Net Unrealized Losses on Available-for-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (240) (339) (227) (419)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax (220) (62) (244) 18
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (49) 1 (38) 1
Total Other Comprehensive Income (Loss) (269) (61) (282) 19
Ending balance (509) (400) (509) (400)
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 1,061 969 1,148 915
Total Other Comprehensive Income (Loss) (298) (88) (385) (34)
Ending balance $ 763 $ 881 $ 763 $ 881