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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 TAXES
Current federal									$ 19,430	$ 16,871	$ 27,064
Deferred federal									(408)	707	(199)
Revalue deferred taxes due to tax reform									0	(408)	4,137
Current state									1,394	1,462	1,559
Deferred state									(78)	(99)	(257)
Total income tax expense	$ 5,431	$ 5,119	$ 5,409	$ 4,379	$ 5,480	$ 4,679	$ 5,110	$ 3,264	$ 20,338	$ 18,533	$ 32,304