INCOME TAXES - Components (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:
Federal									$ 12,665	$ 5,270	$ 8,762
State									639	1,023	937
Total current									13,304	6,293	9,699
Deferred:
Federal									(419)	3,299	10,251
State									1,175	(451)	(1,004)
Total deferred									756	2,848	9,247
Total income tax expense	$ 3,934	$ 3,852	$ 2,859	$ 3,415	$ 2,878	$ 1,381	$ 1,701	$ 3,181	$ 14,060	$ 9,141	$ 18,946