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FAIR VALUE (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Measurements
   
Investment securities available-for-sale    
Total investment securities available-for-sale $ 2,892,761 $ 2,607,029
Derivative    
Derivatives liabilities (38,552) (42,060)
Fair Value Measurements | Foreign exchange options
   
Derivative    
Derivative assets 5,955 5,011
Fair Value Measurements | Interest rate swaps
   
Derivative    
Derivative assets 25,931 36,943
Fair Value Measurements | Short-term foreign exchange contracts
   
Derivative    
Short-term foreign exchange contracts 4,068 896
Fair Value Measurements | U.S. Treasury securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 525,707 460,677
Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise debt securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 403,061 197,855
Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 179,258 180,665
Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 977,950 1,144,085
Fair Value Measurements | Municipal securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 250,006 167,093
Fair Value Measurements | Other residential mortgage-backed securities: | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 14,692  
Fair Value Measurements | Other commercial mortgage-backed securities: | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 51,293 17,084
Fair Value Measurements | Corporate debt securities | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 465,928 411,983
Fair Value Measurements | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 14,942 17,417
Fair Value Measurements | Other securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 9,924 10,170
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 525,707 460,677
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 525,707 460,677
Significant Other Observable Inputs (Level 2)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 2,360,922 2,141,552
Derivative    
Derivatives liabilities (35,041) (39,008)
Significant Other Observable Inputs (Level 2) | Foreign exchange options
   
Derivative    
Derivative assets 5,955 5,011
Significant Other Observable Inputs (Level 2) | Interest rate swaps
   
Derivative    
Derivative assets 25,931 36,943
Significant Other Observable Inputs (Level 2) | Short-term foreign exchange contracts
   
Derivative    
Short-term foreign exchange contracts 4,068 896
Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise debt securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 403,061 197,855
Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 179,258 180,665
Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 977,950 1,144,085
Significant Other Observable Inputs (Level 2) | Municipal securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 250,006 167,093
Significant Other Observable Inputs (Level 2) | Other residential mortgage-backed securities: | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 14,692  
Significant Other Observable Inputs (Level 2) | Other commercial mortgage-backed securities: | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 51,293 17,084
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 465,928 411,983
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 8,810 12,617
Significant Other Observable Inputs (Level 2) | Other securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 9,924 10,170
Significant Unobservable Inputs (Level 3)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 6,132 4,800
Derivative    
Derivatives liabilities (3,511) (3,052)
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale $ 6,132 $ 4,800