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INVESTMENT SECURITIES (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | $ 541,980 | $ 620,165
Continuous unrealized loss position less than 12 months, unrealized losses | (6,599) | (6,989)
Continuous unrealized loss position 12 months or more, fair value | 118,665 | 195,271
Continuous unrealized loss position 12 months or more, unrealized losses | (11,402) | (19,739)
Continuous unrealized loss position total, fair value | 660,645 | 815,436
Continuous unrealized loss position total, unrealized losses | (18,001) | (26,728)
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 | 52,587 | 95,232
Continuous unrealized loss position less than 12 months, unrealized losses | (31) | (71)
Continuous unrealized loss position total, fair value | 52,587 | 95,232
Continuous unrealized loss position total, unrealized losses | (31) | (71)
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 | 24,874 | 24,912
Continuous unrealized loss position less than 12 months, unrealized losses | (120) | (82)
Continuous unrealized loss position total, fair value | 24,874 | 24,912
Continuous unrealized loss position total, unrealized losses | (120) | (82)
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial 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 | 44,066 | 10,013
Continuous unrealized loss position less than 12 months, unrealized losses | (411) | (36)
Continuous unrealized loss position total, fair value | 44,066 | 10,013
Continuous unrealized loss position total, unrealized losses | (411) | (36)
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 | 203,984 | 215,826
Continuous unrealized loss position less than 12 months, unrealized losses | (1,301) | (678)
Continuous unrealized loss position total, fair value | 203,984 | 215,826
Continuous unrealized loss position total, unrealized losses | (1,301) | (678)
Municipal securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 120,187 | 48,363
Continuous unrealized loss position less than 12 months, unrealized losses | (2,639) | (731)
Continuous unrealized loss position total, fair value | 120,187 | 48,363
Continuous unrealized loss position total, unrealized losses | (2,639) | (731)
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 | 94,204 | 225,819
Continuous unrealized loss position less than 12 months, unrealized losses | (2,044) | (5,391)
Continuous unrealized loss position 12 months or more, fair value | 105,279 | 182,697
Continuous unrealized loss position 12 months or more, unrealized losses | (4,721) | (12,181)
Continuous unrealized loss position total, fair value | 199,483 | 408,516
Continuous unrealized loss position total, unrealized losses | (6,765) | (17,572)
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 | 2,078 |
Continuous unrealized loss position less than 12 months, unrealized losses | (53) |
Continuous unrealized loss position 12 months or more, fair value | 13,386 | 12,574
Continuous unrealized loss position 12 months or more, unrealized losses | (6,681) | (7,558)
Continuous unrealized loss position total, fair value | 15,464 | 12,574
Continuous unrealized loss position total, unrealized losses | $ (6,734) | $ (7,558)

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