INCOME TAXES - Summary of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current – federal									$ 21,994	$ 27,714	$ 33,074
Current - state									5,328	1,375	5,230
Deferred - federal									19,639	496	3,874
Deferred - state									3,182	878	(5,069)
Remeasurement of deferred tax assets and deferred tax liabilities at reduced federal corporate tax rate									0	0	13,625
Provision for income taxes	$ 20,959	$ 5,692	$ 12,064	$ 11,428	$ 7,017	$ 13,317	$ 2,423	$ 7,706	$ 50,143	$ 30,463	$ 50,734