ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale investment securities:
Net unrealized gains (losses) arising during the period	$ 22,454	$ 70,537	$ (47,988)
Net realized gains reclassified into net income	(40,367)	(10,715)	(12,577)
Net change	(17,913)	59,822	(60,565)
Foreign currency translation adjustments:
Net unrealized losses arising during period	(8,797)	0	0
Net change	(8,797)	0	0
Other comprehensive (loss) income	(26,710)	59,822	(60,565)
Available-for-sale investment securities:
Net unrealized gains (losses) arising during the period	(9,442)	(29,626)	20,155
Net realized gains reclassified into net income	16,974	4,500	5,282
Net change	7,532	(25,126)	25,437
Foreign currency translation adjustments:
Net unrealized losses arising during period	0	0	0
Net change	0	0	0
Other comprehensive (loss) income	7,532	(25,126)	25,437
Available-for-sale investment securities:
Net unrealized gains (losses) arising during the period	13,012	40,911	(27,833)
Net realized gains reclassified into net income	(23,393)	(6,215)	(7,295)
Net change	(10,381)	34,696	(35,128)
Foreign currency translation adjustments:
Net unrealized losses arising during period	(8,797)	0	0
Net change	(8,797)	0	0
Other comprehensive (loss) income	$ (19,178)	$ 34,696	$ (35,128)