INCOME TAXES - Summary of Income Tax Expense (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
Income Tax Disclosure [Abstract]
Current - federal									$ 73,705	$ 21,994	$ 27,714
Current - state									12,479	5,328	1,375
Deferred - federal									(7,881)	19,639	496
Deferred - state									(47)	3,182	878
Provision for income taxes	$ 31,708	$ 34,037	$ 8,609	$ 3,902	$ 20,959	$ 5,692	$ 12,064	$ 11,428	$ 78,256	$ 50,143	$ 30,463