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INVESTMENT SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | $ 1,108,347 | $ 1,692,885
Continuous unrealized loss position less than 12 months, unrealized losses | (63,558) | (29,417)
Continuous unrealized loss position 12 months or more, fair value | 359,776 | 16,180
Continuous unrealized loss position 12 months or more, unrealized losses | (44,188) | (19,435)
Continuous unrealized loss position total, fair value | 1,468,123 | 1,709,065
Continuous unrealized loss position total, unrealized losses | (107,746) | (48,852)
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 143,265 | 935,654
Continuous unrealized loss position less than 12 months, unrealized losses | (279) | (18,121)
Continuous unrealized loss position total, fair value | 143,265 | 935,654
Continuous unrealized loss position total, unrealized losses | (279) | (18,121)
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 [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 195,393 |
Continuous unrealized loss position less than 12 months, unrealized losses | (772) |
Continuous unrealized loss position total, fair value | 195,393 |
Continuous unrealized loss position total, unrealized losses | (772) |
Municipal securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 1,158 |
Continuous unrealized loss position less than 12 months, unrealized losses | (5) |
Continuous unrealized loss position total, fair value | 1,158 |
Continuous unrealized loss position total, unrealized losses | (5) |
Other residential mortgage-backed securities: | Non-investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position 12 months or more, fair value |  | 6,254
Continuous unrealized loss position 12 months or more, unrealized losses |  | (8,742)
Continuous unrealized loss position total, fair value |  | 6,254
Continuous unrealized loss position total, unrealized losses |  | (8,742)
Corporate debt securities | Investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 754,055 | 656,434
Continuous unrealized loss position less than 12 months, unrealized losses | (61,935) | (8,765)
Continuous unrealized loss position 12 months or more, fair value | 350,181 |
Continuous unrealized loss position 12 months or more, unrealized losses | (33,675) |
Continuous unrealized loss position total, fair value | 1,104,236 | 656,434
Continuous unrealized loss position total, unrealized losses | (95,610) | (8,765)
Corporate debt securities | Non-investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 9,973 | 24,105
Continuous unrealized loss position less than 12 months, unrealized losses | (565) | (623)
Continuous unrealized loss position 12 months or more, fair value | 9,595 | 9,926
Continuous unrealized loss position 12 months or more, unrealized losses | (10,513) | (10,693)
Continuous unrealized loss position total, fair value | 19,568 | 34,031
Continuous unrealized loss position total, unrealized losses | (11,078) | (11,316)
Other securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 4,503 | 76,692
Continuous unrealized loss position less than 12 months, unrealized losses | (2) | (1,908)
Continuous unrealized loss position total, fair value | 4,503 | 76,692
Continuous unrealized loss position total, unrealized losses | $ (2) | $ (1,908)

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