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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