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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | $ 1,902,789 |  |  | $ 3,132,968 |
Gross Unrealized Gains | 28,693 |  |  | 47,356 |
Gross Unrealized Losses | (57,743) |  |  | (107,746) |
Fair Value | 1,873,739 |  |  | 3,072,578 |
Other than temporary impairment, pre-tax basis, credit portion recognized in earnings | 99 |  |  | 633 |
Other than temporary impairment, pre-tax basis, non-credit portion recognized in other comprehensive income | 5,066 |  | 5,091 | 5,100 |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 71,509 |  |  | 19,892 |
Gross Unrealized Gains | 704 |  |  | 833 |
Gross Unrealized Losses | (25) |  |  |  |
Fair Value | 72,188 |  |  | 20,725 |
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 359,424 |  |  | 575,148 |
Gross Unrealized Gains | 374 |  |  | 1,709 |
Gross Unrealized Losses | (74) |  |  | (279) |
Fair Value | 359,724 |  |  | 576,578 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 44,702 |  |  | 46,008 |
Gross Unrealized Gains | 3,987 |  |  | 3,307 |
Fair Value | 48,689 |  |  | 49,315 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 856,734 |  |  | 963,688 |
Gross Unrealized Gains | 19,969 |  |  | 30,854 |
Gross Unrealized Losses | (459) |  |  | (772) |
Fair Value | 876,244 |  |  | 993,770 |
Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 62,652 |  |  | 76,255 |
Gross Unrealized Gains | 3,160 |  |  | 3,696 |
Gross Unrealized Losses | (30) |  |  | (5) |
Fair Value | 65,782 |  |  | 79,946 |
Corporate debt securities | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 473,187 |  |  | 1,411,409 |
Gross Unrealized Gains | 245 |  |  | 6,762 |
Gross Unrealized Losses | (47,377) |  |  | (95,610) |
Fair Value | 426,055 |  |  | 1,322,561 |
Corporate debt securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 24,665 | [1] |  | 30,693 | [1]
Gross Unrealized Gains | 32 | [1] |  |  |
Gross Unrealized Losses | (9,778) | [1] |  | (11,078) | [1]
Fair Value | 14,919 | [1] |  | 19,615 | [1]
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 9,916 |  |  | 9,875 |
Gross Unrealized Gains | 222 |  |  | 195 |
Gross Unrealized Losses |  |  |  | (2) |
Fair Value | $ 10,138 |  |  | $ 10,068 |
[1] | For the six months ended June 30, 2012, the Company recorded $99 thousand, on a pre-tax basis, of the credit portion of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust preferred securities in other comprehensive income. The Company recorded $633 thousand, on a pre-tax basis, of the credit portion of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust preferred securities and other mortgage-backed securities in other comprehensive income for the year ended December 31, 2011.

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