ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	$ 25,995	$ 5,413	$ 2,014
AFS securities: | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross reclassification	0	(126)	(1,215)
Income tax expense	0	50	468
Reclassification, net of tax	0	(76)	(747)
Cash flow hedges: | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross reclassification	161	0	0
Income tax expense	(62)	0	0
Reclassification, net of tax	$ 99	$ 0	$ 0