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INVESTMENT SECURITIES, Investment Portfolio (Details) (USD $) In Thousands | Sep. 30, 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 | $ 1,337,085 | $ 1,692,885
Continuous unrealized loss position less than 12 months, unrealized losses | (63,610) | (29,417)
Continuous unrealized loss position 12 months or more, fair value | 255,636 | 16,180
Continuous unrealized loss position 12 months or more, unrealized losses | (24,556) | (19,435)
Continuous unrealized loss position total, fair value | 1,592,721 | 1,709,065
Continuous unrealized loss position total, unrealized losses | (88,166) | (48,852)
US Treasury Securities [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 0 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | 0 | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 0 | 0
Continuous unrealized loss position total, unrealized losses | 0 | 0
US Government Agencies and Government Sponsored Enterprise Debt Securities [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 177,715 | 935,654
Continuous unrealized loss position less than 12 months, unrealized losses | (708) | (18,121)
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 177,715 | 935,654
Continuous unrealized loss position total, unrealized losses | (708) | (18,121)
Commercial Mortgage Backed Securities Issued By US Government Agencies And Government Sponsored Enterprise [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 0 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | 0 | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 0 | 0
Continuous unrealized loss position total, unrealized losses | 0 | 0
Residential Mortgage Backed Securities Issued By US Government Agencies And Government Sponsored Enterprise [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 195,248 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | (1,067) | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 195,248 | 0
Continuous unrealized loss position total, unrealized losses | (1,067) | 0
Municipal Securities [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 9,715 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | (133) | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 9,715 | 0
Continuous unrealized loss position total, unrealized losses | (133) | 0
Other Residential Mortgage-Backed Securities [Member] | Investment Grade [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 0 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | 0 | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 0 | 0
Continuous unrealized loss position total, unrealized losses | 0 | 0
Other Residential Mortgage-Backed Securities [Member] | Non-investment Grade [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 0 | 0
Continuous unrealized loss position less than 12 months, unrealized losses | 0 | 0
Continuous unrealized loss position 12 months or more, fair value | 0 | 6,254
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | (8,742)
Continuous unrealized loss position total, fair value | 0 | 6,254
Continuous unrealized loss position total, unrealized losses | 0 | (8,742)
Corporate Debt Securities [Member] | Investment Grade [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 944,337 | 656,434
Continuous unrealized loss position less than 12 months, unrealized losses | (61,314) | (8,765)
Continuous unrealized loss position 12 months or more, fair value | 247,020 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | (12,963) | 0
Continuous unrealized loss position total, fair value | 1,191,357 | 656,434
Continuous unrealized loss position total, unrealized losses | (74,277) | (8,765)
Corporate Debt Securities [Member] | Non-investment Grade [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 5,580 | 24,105
Continuous unrealized loss position less than 12 months, unrealized losses | (387) | (623)
Continuous unrealized loss position 12 months or more, fair value | 8,616 | 9,926
Continuous unrealized loss position 12 months or more, unrealized losses | (11,593) | (10,693)
Continuous unrealized loss position total, fair value | 14,196 | 34,031
Continuous unrealized loss position total, unrealized losses | (11,980) | (11,316)
Other Securities [Member] |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale [Abstract] |  |
Continuous unrealized loss position less than 12 months, fair value | 4,490 | 76,692
Continuous unrealized loss position less than 12 months, unrealized losses | (1) | (1,908)
Continuous unrealized loss position 12 months or more, fair value | 0 | 0
Continuous unrealized loss position 12 months or more, unrealized losses | 0 | 0
Continuous unrealized loss position total, fair value | 4,490 | 76,692
Continuous unrealized loss position total, unrealized losses | $ (1) | $ (1,908)

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