STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, before-tax amount	$ (48,567)	$ 73,910	$ (21,264)
Less: reclassification adjustment for losses/(gains) included in income, before-tax amount	(12,089)	(757)	(9,703)
Net unrealized gain (loss), before-tax amount	(60,656)	73,153	(30,967)
Non credit-related impairment loss on securities, before-tax amount		(5,066)	(5,103)
Foreign currency translation adjustments, before-tax amount		(1,552)	(1,317)
Unrealized gain on other asset investment, before-tax amount	579	53	334
Less: reclassification adjustment for gains included in income, before-tax amount	(488)	(23)	(61)
Other comprehensive income (loss), before-tax amount	(60,565)	66,565	(37,114)
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, tax (expense) or benefit	20,398	(31,042)	8,931
Less: reclassification adjustment for losses/(gains) included in income, tax (expense) or benefit	5,077	318	4,075
Net unrealized gain (loss), tax (expense) or benefit	25,475	(30,724)	13,006
Non credit-related impairment loss on securities, tax effect		2,128	2,143
Foreign currency translation adjustments, tax (expense) or benefit		652	553
Unrealized gain on other asset investment, tax (expense) or benefit	(243)	(22)	(140)
Less: reclassification adjustment for gains included in income, tax (expense) or benefit	205	10	26
Other comprehensive income (loss), tax (expense) or benefit	25,437	(27,956)	15,588
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, net of tax amount	(28,169)	42,868	(12,333)
Less: reclassification adjustment for losses/(gains) included in income	(7,012)	(439)	(5,628)
Net unrealized gain (loss), net of tax amount	(35,181)	42,429	(17,961)
Non credit-related impairment loss on securities, net of tax amount		(2,938)	(2,960)
Foreign currency translation adjustments, net of tax amount		(900)	(764)
Unrealized gain on other asset investment, net of tax amount	336	31	194
Less: reclassification adjustment for gains included in income, net of tax amount	(283)	(13)	(35)
Other comprehensive (loss) income	$ (35,128)	$ 38,609	$ (21,526)