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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets and liabilities measured at fair value    
Available for sale securities: $ 1,501,948 $ 1,536,745
U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 128,392 280,939
States and political subdivisions debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 180,024 185,911
Corporations debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 140,003 127,946
U.S. Government sponsored entities mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 973,345 941,043
Non-agency collateralized mortgage obligations mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 79,346  
Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 838 906
Recurring basis | Fair Value
   
Assets and liabilities measured at fair value    
Total 1,502,202 1,535,678
Recurring basis | Fair Value | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: 254 (248)
Recurring basis | Fair Value | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives:   (819)
Recurring basis | Fair Value | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 128,392 280,939
Recurring basis | Fair Value | States and political subdivisions debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 180,024 185,911
Recurring basis | Fair Value | Corporations debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 140,003 127,946
Recurring basis | Fair Value | U.S. Government sponsored entities mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 973,345 941,043
Recurring basis | Fair Value | Non-agency collateralized mortgage obligations mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 79,346  
Recurring basis | Fair Value | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 838 906
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets and liabilities measured at fair value    
Total 838 906
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 838 906
Recurring basis | Significant Other Observable Inputs (Level 2)
   
Assets and liabilities measured at fair value    
Total 1,491,789 1,521,946
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: 254 (248)
Recurring basis | Significant Other Observable Inputs (Level 2) | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives:   (819)
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 128,392 280,939
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 170,449 173,085
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporations debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 140,003 127,946
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 973,345 941,043
Recurring basis | Significant Other Observable Inputs (Level 2) | Non-agency collateralized mortgage obligations mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 79,346  
Recurring basis | Significant Unobservable Inputs (Level 3)
   
Assets and liabilities measured at fair value    
Total 9,575 12,826
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: $ 9,575 $ 12,826