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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value $ 527,308 $ 1,108,347
Continuous unrealized loss position less than 12 months, unrealized losses (16,087) (63,558)
Continuous unrealized loss position 12 months or more, fair value 328,479 359,776
Continuous unrealized loss position 12 months or more, unrealized losses (41,656) (44,188)
Continuous unrealized loss position total, fair value 855,787 1,468,123
Continuous unrealized loss position total, unrealized losses (57,743) (107,746)
U.S. Treasury securities
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value 30,468  
Continuous unrealized loss position less than 12 months, unrealized losses (25)  
Continuous unrealized loss position total, fair value 30,468  
Continuous unrealized loss position total, unrealized losses (25)  
U.S. Government agency and U.S. Government sponsored enterprise debt securities
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value 223,269 143,265
Continuous unrealized loss position less than 12 months, unrealized losses (74) (279)
Continuous unrealized loss position total, fair value 223,269 143,265
Continuous unrealized loss position total, unrealized losses (74) (279)
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value 169,040 195,393
Continuous unrealized loss position less than 12 months, unrealized losses (459) (772)
Continuous unrealized loss position total, fair value 169,040 195,393
Continuous unrealized loss position total, unrealized losses (459) (772)
Municipal securities
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value 3,106 1,158
Continuous unrealized loss position less than 12 months, unrealized losses (30) (5)
Continuous unrealized loss position total, fair value 3,106 1,158
Continuous unrealized loss position total, unrealized losses (30) (5)
Corporate debt securities | Investment grade
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value 101,425 754,055
Continuous unrealized loss position less than 12 months, unrealized losses (15,499) (61,935)
Continuous unrealized loss position 12 months or more, fair value 318,122 350,181
Continuous unrealized loss position 12 months or more, unrealized losses (31,878) (33,675)
Continuous unrealized loss position total, fair value 419,547 1,104,236
Continuous unrealized loss position total, unrealized losses (47,377) (95,610)
Corporate debt securities | Non-investment grade
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value   9,973
Continuous unrealized loss position less than 12 months, unrealized losses   (565)
Continuous unrealized loss position 12 months or more, fair value 10,357 9,595
Continuous unrealized loss position 12 months or more, unrealized losses (9,778) (10,513)
Continuous unrealized loss position total, fair value 10,357 19,568
Continuous unrealized loss position total, unrealized losses (9,778) (11,078)
Other securities
    
Continuous unrealized loss position, fair values of investment securities available-for-sale    
Continuous unrealized loss position less than 12 months, fair value   4,503
Continuous unrealized loss position less than 12 months, unrealized losses   (2)
Continuous unrealized loss position total, fair value   4,503
Continuous unrealized loss position total, unrealized losses   $ (2)