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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
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Dec. 31, 2011
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INVESTMENT SECURITIES    
Number of investment securities in an unrealized loss position 118 9
Total temporary impaired securities    
Less than 12 months, Fair Value $ 303,314 $ 145,490
Less than 12 months, Unrealized Losses (2,795) (840)
Total, Fair Value 303,314 145,490
Total, Unrealized Losses (2,795) (840)
States and political subdivisions debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 73,128  
Less than 12 months, Unrealized Losses (1,194)  
Total, Fair Value 73,128  
Total, Unrealized Losses (1,194)  
U.S. Government sponsored entities mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 206,981 144,520
Less than 12 months, Unrealized Losses (1,538) (825)
Total, Fair Value 206,981 144,520
Total, Unrealized Losses (1,538) (825)
Corporate securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 23,205  
Less than 12 months, Unrealized Losses (63)  
Total, Fair Value 23,205  
Total, Unrealized Losses (63)  
Other
    
Total temporary impaired securities    
Less than 12 months, Fair Value   970
Less than 12 months, Unrealized Losses   (15)
Total, Fair Value   970
Total, Unrealized Losses   $ (15)