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INVESTMENT SECURITIES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | $ 3,132,968,000 |  | $ 2,900,410,000 |
Gross Unrealized Gains | 47,356,000 |  | 24,383,000 |
Gross Unrealized Losses | (107,746,000) |  | (48,852,000) |
Fair Value | 3,072,578,000 |  | 2,875,941,000 |
Other than temporary impairment, pre-tax basis, credit portion recognized in earnings | 633,000 |  | 16,700,000 |
Other than temporary impairment, pre-tax basis, non-credit portion recognized in other comprehensive income | 5,100,000 |  | 15,400,000 |
U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 19,892,000 |  | 19,847,000 |
Gross Unrealized Gains | 833,000 |  | 607,000 |
Fair Value | 20,725,000 |  | 20,454,000 |
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 | 575,148,000 |  | 1,349,289,000 |
Gross Unrealized Gains | 1,709,000 |  | 2,297,000 |
Gross Unrealized Losses | (279,000) |  | (18,121,000) |
Fair Value | 576,578,000 |  | 1,333,465,000 |
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 | 46,008,000 |  | 18,620,000 |
Gross Unrealized Gains | 3,307,000 |  | 512,000 |
Fair Value | 49,315,000 |  | 19,132,000 |
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 | 963,688,000 |  | 295,140,000 |
Gross Unrealized Gains | 30,854,000 |  | 11,574,000 |
Gross Unrealized Losses | (772,000) |  |  |
Fair Value | 993,770,000 |  | 306,714,000 |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 76,255,000 |  |  |
Gross Unrealized Gains | 3,696,000 |  |  |
Gross Unrealized Losses | (5,000) |  |  |
Fair Value | 79,946,000 |  |  |
Other residential mortgage-backed securities: | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost |  |  | 14,996,000 |
Gross Unrealized Losses |  |  | (8,742,000) |
Fair Value |  |  | 6,254,000 |
Corporate debt securities | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 1,411,409,000 |  | 1,056,537,000 |
Gross Unrealized Gains | 6,762,000 |  | 9,095,000 |
Gross Unrealized Losses | (95,610,000) |  | (8,765,000) |
Fair Value | 1,322,561,000 |  | 1,056,867,000 |
Corporate debt securities | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 30,693,000 | [1] | 50,015,000 | [1]
Gross Unrealized Gains |  |  | 31,000 | [1]
Gross Unrealized Losses | (11,078,000) | [1] | (11,316,000) | [1]
Fair Value | 19,615,000 | [1] | 38,730,000 | [1]
Other securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 9,875,000 |  | 95,966,000 |
Gross Unrealized Gains | 195,000 |  | 267,000 |
Gross Unrealized Losses | (2,000) |  | (1,908,000) |
Fair Value | $ 10,068,000 |  | $ 94,325,000 |
[1] | For 2011, the Company recorded $633 thousand, on a pre-tax basis, of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust securities and other mortgage-backed securities in other comprehensive income. For 2010, the Company recorded $16.7 million, on a pre-tax basis, of OTTI through earnings and $15.4 million of the non-credit portion of OTTI for pooled trust securities and other mortgage-backed securities in other comprehensive income.

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- Definition The amount of other than temporary impairment (OTTI) loss on a debt security, categorized as Available-for-sale, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount, which includes the portion attributable to the noncontrolling interest, if any, is a portion of the deduction from the total impairment losses of investments (before taxes) presented on the income statement; this amount is also referred to as the amount incurred by the reporting entity or the consolidated entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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