INCOME TAXES - Components (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal									$ 16,262	$ 12,665	$ 5,270
State									1,457	639	1,023
Total current									17,719	13,304	6,293
Deferred:
Federal									(3,782)	(419)	3,299
State									(252)	1,175	(451)
Total deferred									(4,034)	756	2,848
Total income tax expense	$ 3,881	$ 3,999	$ 3,129	$ 2,676	$ 3,934	$ 3,852	$ 2,859	$ 3,415	$ 13,685	$ 14,060	$ 9,141