ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ (5,216)	$ (2,562)	$ (1,757)	$ (1,674)	$ 433	$ (1,072)	$ (1,268)	$ (1,138)	$ (11,209)	$ (3,045)	$ (2,559)
Reclassifications out of accumulated other comprehensive (loss) income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of available for sale securities									0	40	0
Income tax expense									0	(17)	0
Total reclassifications, net of income tax									$ 0	$ 23	$ 0