INCOME TAXES (Schedule of Income Tax Expense Included in Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal:
Current (benefit)/expense									$ (7,046)	$ 1,559	$ 13,207
Deferred expense									16,908	13,922	486
State:
Current expense									3,554	2,133	2,105
Deferred expense									134	196	466
Total income tax expense	$ 2,887	$ 3,617	$ 3,832	$ 3,214	$ 2,922	$ 6,256	$ 4,908	$ 3,724	$ 13,550	$ 17,810	$ 16,264