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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 2) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value
   
Assets and liabilities measured at fair value    
Total $ 1,535,678 $ 1,492,419
Fair Value | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: (248) 102
Fair Value | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives: (819) (677)
Fair Value | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 280,939 373,177
Fair Value | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: 185,911 12,994
Fair Value | U.S. Government sponsored entities mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 941,043 1,097,302
Fair Value | Corporate securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 127,946 8,551
Fair Value | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 906 970
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets and liabilities measured at fair value    
Total 906 970
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 906 970
Significant Other Observable Inputs (Level 2)
   
Assets and liabilities measured at fair value    
Total 1,521,946 1,478,455
Significant Other Observable Inputs (Level 2) | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: (248) 102
Significant Other Observable Inputs (Level 2) | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives: (819) (677)
Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 280,939 373,177
Significant Other Observable Inputs (Level 2) | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: 173,085  
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: 941,043 1,097,302
Significant Other Observable Inputs (Level 2) | Corporate securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 127,946 8,551
Significant Unobservable Inputs (Level 3)
   
Assets and liabilities measured at fair value    
Total 12,826 12,994
Significant Unobservable Inputs (Level 3) | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: $ 12,826 $ 12,994