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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 2) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value
   
Assets and liabilities measured at fair value    
Total $ 1,536,359 $ 1,535,678
Fair Value | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: 122 (248)
Fair Value | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives: (828) (819)
Fair Value | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 210,098 280,939
Fair Value | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: 193,626 185,911
Fair Value | U.S. Government sponsored entities mortgage-backed securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 995,006 941,043
Fair Value | Non-agency collateralized mortgage obligations
   
Assets and liabilities measured at fair value    
Available for sale securities: 9,984  
Fair Value | Corporate securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 127,535 127,946
Fair Value | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 816 906
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets and liabilities measured at fair value    
Total 816 906
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
   
Assets and liabilities measured at fair value    
Available for sale securities: 816 906
Significant Other Observable Inputs (Level 2)
   
Assets and liabilities measured at fair value    
Total 1,522,830 1,521,946
Significant Other Observable Inputs (Level 2) | Interest rate contracts
   
Assets and liabilities measured at fair value    
Derivatives: 122 (248)
Significant Other Observable Inputs (Level 2) | Amended TARP warrant
   
Assets and liabilities measured at fair value    
Derivatives: (828) (819)
Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities debt securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 210,098 280,939
Significant Other Observable Inputs (Level 2) | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: 180,913 173,085
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: 995,006 941,043
Significant Other Observable Inputs (Level 2) | Non-agency collateralized mortgage obligations
   
Assets and liabilities measured at fair value    
Available for sale securities: 9,984  
Significant Other Observable Inputs (Level 2) | Corporate securities
   
Assets and liabilities measured at fair value    
Available for sale securities: 127,535 127,946
Significant Unobservable Inputs (Level 3)
   
Assets and liabilities measured at fair value    
Total 12,713 12,826
Significant Unobservable Inputs (Level 3) | States and political subdivisions
   
Assets and liabilities measured at fair value    
Available for sale securities: $ 12,713 $ 12,826