INCOME TAXES (Components 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
Current:
Federal									$ 34,513	$ 24,106	$ 16,769
State									12,450	11,298	8,686
Total current expense									46,963	35,404	25,455
Deferred:
Federal									(8,498)	760	2,615
State									(2,412)	(1,174)	145
Total deferred expense (benefit)									(10,910)	(414)	2,760
Total income tax expense	$ 9,046	$ 13,681	$ 7,417	$ 5,909	$ 5,155	$ 7,941	$ 13,584	$ 8,310	$ 36,053	$ 34,990	$ 28,215