ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications from AOCL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized (loss) gain on securities sales	$ 0	$ (22)	$ (50)
Tax effect	$ (5,895)	(5,778)	(4,599)
Reclassification out of Accumulated Other Comprehensive Loss | Unrealized Gains and (Losses) on Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized (loss) gain on securities sales		22	50
Tax effect		(5)	(10)
Net of Tax		$ 17	$ 40