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ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 548,980  
Ending balance 758,493  
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (15,172) $ (19,387)
Gains arising during period 2,750 4,577
Amounts reclassified from accumulated other comprehensive loss (232) (554)
Income tax expense (413) (855)
Net other comprehensive income 2,105 3,168
Ending balance (13,067) (16,219)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (12,120) (15,187)
Gains arising during period 1,994 3,299
Amounts reclassified from accumulated other comprehensive loss (525) 227
Income tax expense (413) (855)
Net other comprehensive income 1,056 2,671
Ending balance (11,064) (12,516)
Accumulated Other-than-Temporary Impairment of Investment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (2,667) (2,878)
Gains arising during period 0  
Amounts reclassified from accumulated other comprehensive loss 158 158
Income tax expense 0  
Net other comprehensive income 158 158
Ending balance (2,509) (2,720)
Interest Rate Derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (385) (1,322)
Gains arising during period 756 1,278
Amounts reclassified from accumulated other comprehensive loss 135 (939)
Income tax expense 0  
Net other comprehensive income 891 339
Ending balance $ 506 $ (983)