ACCUMULATED OTHER COMPREHENSIVE INCOME (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Available-for-sale investment securities:
Net unrealized gains arising during the period	$ 26,130	$ 20,470
Net realized gains reclassified into net income	(3,842)	(4,404)
Net change	22,288	16,066
Foreign currency translation adjustments:
Net unrealized losses arising during period	(33)	0
Net change	(33)	0
Other comprehensive income	22,255	16,066
Available-for-sale investment securities:
Net unrealized gains arising during the period	(10,988)	(8,598)
Net realized gains reclassified into net income	1,616	1,850
Net change	(9,372)	(6,748)
Foreign currency translation adjustments:
Net unrealized losses arising during period	0	0
Net change	0	0
Other comprehensive income	(9,372)	(6,748)
Available-for-sale investment securities:
Net unrealized gains arising during the period	15,142	11,872
Net realized gains reclassified into net income	(2,226)	(2,554)
Net change	12,916	9,318
Foreign currency translation adjustments:
Net unrealized losses arising during period	(33)	0
Net change	(33)	0
Other comprehensive income	$ 12,883	$ 9,318