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INVESTMENT SECURITIES, Available-For-Sale Portfolio (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 3,200,187,000 |  | $ 2,900,410,000
Gross Unrealized Gains | 32,342,000 |  | 24,383,000
Gross Unrealized Losses | (26,421,000) |  | (48,852,000)
Fair Value | 3,206,108,000 |  | 2,875,941,000
US Treasury Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 19,870,000 |  | 19,847,000
Gross Unrealized Gains | 755,000 |  | 607,000
Gross Unrealized Losses | 0 |  | 0
Fair Value | 20,625,000 |  | 20,454,000
US Government Agencies and Government Sponsored Enterprise Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,206,670,000 |  | 1,349,289,000
Gross Unrealized Gains | 2,744,000 |  | 2,297,000
Gross Unrealized Losses | (3,794,000) |  | (18,121,000)
Fair Value | 1,205,620,000 |  | 1,333,465,000
Commercial Mortgage Backed Securities Issued By US Government Agencies And Government Sponsored Enterprise [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 23,709,000 |  | 18,620,000
Gross Unrealized Gains | 625,000 |  | 512,000
Gross Unrealized Losses | 0 |  | 0
Fair Value | 24,334,000 |  | 19,132,000
Residential Mortgage Backed Securities Issued By US Government Agencies And Government Sponsored Enterprise [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 746,942,000 |  | 295,140,000
Gross Unrealized Gains | 18,660,000 |  | 11,574,000
Gross Unrealized Losses | (304,000) |  | 0
Fair Value | 765,298,000 |  | 306,714,000
Municipal Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 32,145,000 |  | 0
Gross Unrealized Gains | 822,000 |  | 0
Gross Unrealized Losses | (87,000) |  | 0
Fair Value | 32,880,000 |  | 0
Other Residential Mortgage-Backed Securities [Member] | Investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 0 |  | 0
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | 0 |  | 0
Fair Value | 0 |  | 0
Other Residential Mortgage-Backed Securities [Member] | Non-investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 0 |  | 14,996,000
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | 0 |  | (8,742,000)
Fair Value | 0 |  | 6,254,000
Corporate Debt Securities [Member] | Investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,125,985,000 |  | 1,056,537,000
Gross Unrealized Gains | 8,390,000 |  | 9,095,000
Gross Unrealized Losses | (12,540,000) |  | (8,765,000)
Fair Value | 1,121,835,000 |  | 1,056,867,000
Corporate Debt Securities [Member] | Non-investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 26,181,000 | [1] | 50,015,000
Gross Unrealized Gains | 0 | [1] | 31,000
Gross Unrealized Losses | (9,684,000) | [1] | (11,316,000)
Fair Value | 16,497,000 | [1] | 38,730,000
Other than temporary impairment , pre-tax basis, credit portion recognized in earnings |  |  | 16,700,000
Other than temporary impairment , pre-tax basis, non-credit portion recognized in other comprehensive income | 5,100,000 |  | 15,400,000
Other Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 18,685,000 |  | 95,966,000
Gross Unrealized Gains | 346,000 |  | 267,000
Gross Unrealized Losses | (12,000) |  | (1,908,000)
Fair Value | $ 19,019,000 |  | $ 94,325,000
[1] | For the six months ended June 30, 2011, the Company recorded $464 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 $16.7 million, on a pre-tax basis, of the credit portion of OTTI through earnings and $15.4 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, 2010.

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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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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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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