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INVESTMENT SECURITIES (Details 2) (Available-for-sale Securities, USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
Available-for-sale Securities |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings |  |  |  |  |
Beginning balance | $ 115,412 | $ 115,511 | $ 115,511 | $ 115,511 | $ 115,511
Additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized | 99 |  |  |  |
Ending balance | $ 115,511 | $ 115,511 | $ 115,511 | $ 115,511 | $ 115,511

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