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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Total temporary impaired securities    
Less than 12 months, Fair Value $ 316,155 $ 145,490
Less than 12 months, Unrealized Losses (2,316) (840)
Total, Fair Value 316,155 145,490
Total, Unrealized Losses (2,316) (840)
States and political subdivisions debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 32,896  
Less than 12 months, Unrealized Losses (407)  
Total, Fair Value 32,896  
Total, Unrealized Losses (407)  
U.S. Government sponsored entities mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 276,434 144,520
Less than 12 months, Unrealized Losses (1,864) (825)
Total, Fair Value 276,434 144,520
Total, Unrealized Losses (1,864) (825)
Corporate securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 6,825  
Less than 12 months, Unrealized Losses (45)  
Total, Fair Value 6,825  
Total, Unrealized Losses (45)  
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)