OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,426)	$ 9,764
Change in other comprehensive income (loss) before reclassification	(138,490)	(13,659)
Amounts reclassified from accumulated other comprehensive income	942	1,469
Net current period other comprehensive income (loss)	(137,548)	(12,190)
Ending balance	(139,974)	(2,426)
Unrealized gains and (Losses) on available- for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	15,674	34,162
Change in other comprehensive income (loss) before reclassification	(144,568)	(18,403)
Amounts reclassified from accumulated other comprehensive income	(2)	(85)
Net current period other comprehensive income (loss)	(144,570)	(18,488)
Ending balance	(128,896)	15,674
Retirement plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(18,100)	(24,398)
Change in other comprehensive income (loss) before reclassification	6,078	4,744
Amounts reclassified from accumulated other comprehensive income	944	1,554
Net current period other comprehensive income (loss)	7,022	6,298
Ending balance	$ (11,078)	$ (18,100)