STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Unrealized gain on investment securities available-for-sale:
Unrealized gains on holding gains arising during period, before-tax amount	$ 26,590	$ 8,174
Less: reclassification adjustment for losses/(gains) included in income, before-tax amount	(3,418)	(5,577)
Net unrealized gain, before-tax amount	23,172	2,597
Unrealized gain (loss) on other asset investment, before-tax amount	(29)	17
Other comprehensive income, before-tax amount	23,143	2,614
Unrealized gain on investment securities available-for-sale:
Unrealized gains on holding gains arising during period, tax (expense) or benefit	(11,168)	(3,433)
Less: reclassification adjustment for losses/(gains) included in income, tax (expense) or benefit	1,435	2,342
Net unrealized gain, tax (expense) or benefit	(9,733)	(1,091)
Unrealized gain (loss) on other asset investment, tax (expense) or benefit	12	(7)
Other comprehensive income, tax (expense) or benefit	(9,721)	(1,098)
Unrealized gain on investment securities available-for-sale:
Unrealized gains on holding gains arising during period, net of tax amount	15,422	4,741
Less: reclassification adjustment for losses/(gains) included in income	(1,983)	(3,235)
Net unrealized gain, net of tax amount	13,439	1,506
Unrealized gain (loss) on other asset investment, net of tax amount	(17)	10
Other comprehensive income	$ 13,422	$ 1,516