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FAIR VALUE (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value Measurements
   
Investment securities available-for-sale    
Total investment securities available-for-sale $ 3,072,578 $ 2,875,941
Derivatives liabilities (24,164) (4,498)
Fair Value Measurements | Equity swap agreements
   
Investment securities available-for-sale    
Derivative assets 202 206
Fair Value Measurements | Foreign exchange options
   
Investment securities available-for-sale    
Derivative assets 3,899 5,084
Fair Value Measurements | Interest rate swaps
   
Investment securities available-for-sale    
Derivative assets 20,474 13
Fair Value Measurements | Short-term foreign exchange contracts
   
Investment securities available-for-sale    
Short-term foreingn exchange contracts 1,403 1,220
Fair Value Measurements | U.S. Treasury securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 20,725 20,454
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 576,578 1,333,465
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 49,315 19,132
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 993,770 306,714
Fair Value Measurements | Municipal securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 79,946  
Fair Value Measurements | Other residential mortgage-backed securities: | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale   6,254
Fair Value Measurements | Corporate debt securities | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 1,322,561 1,056,867
Fair Value Measurements | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 19,615 38,730
Fair Value Measurements | Other securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 10,068 94,325
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 20,725 20,454
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 20,725 20,454
Significant Other Observable Inputs (Level 2)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 3,049,618 2,846,460
Derivatives liabilities (21,530) (1,049)
Significant Other Observable Inputs (Level 2) | Equity swap agreements
   
Investment securities available-for-sale    
Derivative assets 202 206
Significant Other Observable Inputs (Level 2) | Foreign exchange options
   
Investment securities available-for-sale    
Derivative assets 3,899 5,084
Significant Other Observable Inputs (Level 2) | Interest rate swaps
   
Investment securities available-for-sale    
Derivative assets 20,474 13
Significant Other Observable Inputs (Level 2) | Short-term foreign exchange contracts
   
Investment securities available-for-sale    
Short-term foreingn exchange contracts 1,403 1,220
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 576,578 1,333,465
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 49,315 19,132
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 993,770 306,714
Significant Other Observable Inputs (Level 2) | Municipal securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 79,946  
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 1,322,561 1,056,867
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale 17,380 35,957
Significant Other Observable Inputs (Level 2) | Other securities
   
Investment securities available-for-sale    
Total investment securities available-for-sale 10,068 94,325
Significant Unobservable Inputs (Level 3)
   
Investment securities available-for-sale    
Total investment securities available-for-sale 2,235 9,027
Derivatives liabilities (2,634) (3,449)
Significant Unobservable Inputs (Level 3) | Other residential mortgage-backed securities: | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale   6,254
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade
   
Investment securities available-for-sale    
Total investment securities available-for-sale $ 2,235 $ 2,773