INCOME TAXES (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal, current	$ 20,930	$ 17,562	$ 14,395
State, current	953	539	31
Total current income tax provision	21,883	18,101	14,426
Deferred:
Federal, deferred	2,794	509	(662)
State, deferred	981	(61)	(66)
Total deferred income tax provision	3,775	448	(728)
Total income tax provision	$ 25,658	$ 18,549	$ 13,698