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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
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Dec. 31, 2012
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INVESTMENT SECURITIES    
Number of investment securities in an unrealized loss position 280 118
Total temporary impaired securities    
Less than 12 months, Fair Value $ 996,888 $ 303,314
Less than 12 months, Unrealized Losses (39,199) (2,795)
Total, Fair Value 996,888 303,314
Total, Unrealized Losses (39,199) (2,795)
States and political subdivisions debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 171,260 73,128
Less than 12 months, Unrealized Losses (11,074) (1,194)
Total, Fair Value 171,260 73,128
Total, Unrealized Losses (11,074) (1,194)
Corporations debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 68,445 23,205
Less than 12 months, Unrealized Losses (1,702) (63)
Total, Fair Value 68,445 23,205
Total, Unrealized Losses (1,702) (63)
U.S. Government sponsored entities mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 697,996 206,981
Less than 12 months, Unrealized Losses (22,047) (1,538)
Total, Fair Value 697,996 206,981
Total, Unrealized Losses (22,047) (1,538)
Non-agency collateralized mortgage obligations mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 59,187  
Less than 12 months, Unrealized Losses (4,376)  
Total, Fair Value 59,187  
Total, Unrealized Losses $ (4,376)