INCOME TAXES - Provision for Income Taxes (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
Current income taxes:
Federal									$ 10,343	$ 13,704	$ 22,533
State									2,478	2,255	2,550
Total									12,821	15,959	25,083
Deferred income taxes:
Federal									1,182	1,466	1,576
State									500	(18)	64
Total									1,682	1,448	1,640
Total income tax provision	$ 2,390	$ 4,190	$ 3,846	$ 4,077	$ 3,127	$ 3,698	$ 5,450	$ 5,132	$ 14,503	$ 17,407	$ 26,723