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STOCKHOLDERS' EQUITY (Details 6) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Unrealized gain (loss) on investment securities available-for-sale: |  |
Unrealized gains (losses) on holding gains (losses) arising during period, before-tax amount | $ 8,174 | $ 34,948
Less: reclassification adjustment for losses/(gains) included in income, before-tax amount | (5,577) | (483)
Net unrealized gain (loss), before-tax amount | 2,597 | 34,465
Noncredit-related impairment loss on securities, before-tax amount |  | (5,066)
Unrealized gain (loss) on other asset investment, before-tax amount | 17 | 17
Other comprehensive income, before-tax amount | 2,614 | 29,416
Unrealized gain (loss) on investment securities available-for-sale: |  |
Unrealized gains (losses) on holding gains (losses) arising during period, tax (expense) or benefit | (3,433) | (14,678)
Less: reclassification adjustment for losses/(gains) included in income, tax (expense) or benefit | 2,342 | 203
Net unrealized gain (loss), tax (expense) or benefit | (1,091) | (14,475)
Noncredit-related impairment loss on securities, tax effect |  | 2,128
Unrealized gain (loss) on other asset investment, tax (expense) or benefit | (7) | (7)
Other comprehensive income, tax (expense) or benefit | (1,098) | (12,354)
Unrealized gain on investment securities available-for-sale: |  |
Unrealized gains (losses) on holding gains (losses) arising during period, net of tax amount | 4,741 | 20,270
Less: reclassification adjustment for losses/(gains) included in income | (3,235) | (280)
Net unrealized gains (loss), net of tax amount | 1,506 | 19,990
Noncredit-related impairment loss on securities, net of tax amount |  | (2,938)
Unrealized gain (loss) on other asset investment, net of tax amount | 10 | 10
Other comprehensive income | $ 1,516 | $ 17,062

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