STOCKHOLDERS' EQUITY (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, before-tax amount	$ (42,707)	$ 1,728	$ (34,533)	$ 36,676
Less: reclassification adjustment for losses/(gains) included in income, before-tax amount	(5,345)	(71)	(10,922)	(554)
Net unrealized gain (loss), before-tax amount	(48,052)	1,657	(45,455)	36,122
Non credit-related impairment loss on securities, before-tax amount				(5,066)
Unrealized gain (loss) on other investment, before-tax amount	12	(10)	29	7
Other comprehensive income, before-tax amount	(48,040)	1,647	(45,426)	31,063
Unrealized gain (loss) on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, tax (expense) or benefit	17,937	(726)	14,504	(15,404)
Less: reclassification adjustment for losses/(gains) included in income, tax (expense) or benefit	2,245	30	4,587	233
Net unrealized gain (loss), tax (expense) or benefit	20,182	(696)	19,091	(15,171)
Non credit-related impairment loss on securities, tax effect				2,128
Unrealized gain (loss) on other investment, tax (expense) or benefit	(5)	4	(12)	(3)
Other comprehensive income, tax (expense) or benefit	20,177	(692)	19,079	(13,046)
Unrealized gain on investment securities available-for-sale:
Unrealized gains (losses) on holding gains (losses) arising during period, net of tax amount	(24,770)	1,002	(20,029)	21,272
Less: reclassification adjustment for losses/(gains) included in income	(3,100)	(41)	(6,335)	(321)
Net unrealized gains (loss), net of tax amount	(27,870)	961	(26,364)	20,951
Non credit-related impairment loss on securities, net of tax amount				(2,938)
Unrealized gain (loss) on other investment, net of tax amount	7	(6)	17	4
Other comprehensive (loss) income	$ (27,863)	$ 955	$ (26,347)	$ 18,017