INCOME TAXES - Components of the Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current expense (benefit)
U.S. Federal									$ 1,845	$ (386)	$ 9,020
State and local									276	4,838	2,637
Total current expense (benefit)									2,121	4,452	11,657
Deferred expense (benefit)
U.S. Federal									4,632	1,417	2,247
State and local									959	451	653
Total deferred expense (benefit)									5,591	1,868	2,900
Income Tax Expense (Benefit)	$ 3,057	$ (576)	$ 6,606	$ (1,375)	$ 773	$ 8,721	$ (2,301)	$ (873)	$ 7,712	$ 6,320	$ 14,557