STOCKHOLDERS' EQUITY (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, before-tax amount	$ (4,959)	$ 26,474	$ (39,491)	$ 63,150
Less: reclassification adjustment for losses/(gains) included in income, before-tax amount	(1,084)	(93)	(12,006)	(647)
Net unrealized gain (loss), before-tax amount	(6,043)	26,381	(51,497)	62,503
Non credit-related impairment loss on securities, before-tax amount				(5,066)
Foreign currency translation adjustments, before-tax amount		(1,552)		(1,552)
Unrealized gain on other investment, before-tax amount	9	9	38	41
Less: reclassification adjustment for gains included in income, before-tax amount				(25)
Other comprehensive income, before-tax amount	(6,034)	24,838	(51,459)	55,901
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, tax expense or benefit	2,083	(11,119)	16,586	(26,523)
Less: reclassification adjustment for losses/(gains) included in income, tax expense or benefit	455	39	5,042	272
Net unrealized gain (loss), tax expense or benefit	2,538	(11,080)	21,628	(26,251)
Non credit-related impairment loss on securities, tax effect				2,128
Foreign currency translation adjustments, tax expense or benefit		652		652
Unrealized gain (loss) on other investment, tax expense or benefit	(4)	(4)	(16)	(17)
Less: reclassification adjustment for gains included in income, tax expense or benefit				10
Other comprehensive income, tax expense or benefit	2,534	(10,432)	21,612	(23,478)
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, net of tax amount	(2,876)	15,355	(22,905)	36,627
Less: reclassification adjustment for losses/(gains) included in income	(629)	(54)	(6,964)	(375)
Net unrealized gain (loss), net of tax amount	(3,505)	15,301	(29,869)	36,252
Non credit-related impairment loss on securities, net of tax amount				(2,938)
Foreign currency translation adjustments, net of tax amount		(900)		(900)
Unrealized gain on other investment, net of tax amount	5	5	22	24
Less: reclassification adjustment for gains included in income, net of tax amount				(15)
Other comprehensive (loss) income	$ (3,500)	$ 14,406	$ (29,847)	$ 32,423