INCOME TAXES - Provision for Income Taxes (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 income taxes:
Federal									$ 17,150	$ 10,343	$ 13,704
State									3,561	2,478	2,255
Total									20,711	12,821	15,959
Deferred income taxes:
Federal									(946)	1,182	1,466
State									(537)	500	(18)
Total									(1,483)	1,682	1,448
Total income tax provision	$ 6,080	$ 4,715	$ 4,583	$ 3,850	$ 2,390	$ 4,190	$ 3,846	$ 4,077	$ 19,228	$ 14,503	$ 17,407