ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 569,153
Ending balance	551,876
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(19,387)	$ (10,923)
Gains arising during period	4,577	3,029
Amounts reclassified from accumulated other comprehensive loss	(554)	(11,798)
Income tax expense	(855)
Net other comprehensive income (loss)	3,168	(8,769)
Ending balance	(16,219)	(19,692)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(15,187)	(18,021)
Gains arising during period	3,299
Amounts reclassified from accumulated other comprehensive loss	227	(220)
Income tax expense	(855)
Net other comprehensive income (loss)	2,671	(220)
Ending balance	(12,516)	(18,241)
Accumulated Other-than-Temporary Impairment of Investment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,878)	(3,087)
Gains arising during period	0
Amounts reclassified from accumulated other comprehensive loss	158	156
Income tax expense	0
Net other comprehensive income (loss)	158	156
Ending balance	(2,720)	(2,931)
Interest Rate Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,322)	10,185
Gains arising during period	1,278	3,029
Amounts reclassified from accumulated other comprehensive loss	(939)	(11,734)
Income tax expense	0
Net other comprehensive income (loss)	339	(8,705)
Ending balance	$ (983)	$ 1,480