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INVESTMENT SECURITIES (Details 4) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 Security | Dec. 31, 2010 Security | Dec. 31, 2009 | Dec. 31, 2008 ASC 320-10-65 Other-Than-Temporary Impairments | Dec. 31, 2011 US Government Agencies and Government Sponsored Enterprise Debt Securities Security | Dec. 31, 2010 US Government Agencies and Government Sponsored Enterprise Debt Securities Security | Dec. 31, 2011 Residential mortgage-backed securities Security | Dec. 31, 2010 Residential mortgage-backed securities Non-investment grade | Dec. 31, 2011 Mortgage-backed securities Security | Dec. 31, 2010 Mortgage-backed securities Security | Dec. 31, 2011 Corporate debt securities Investment grade Security | Dec. 31, 2010 Corporate debt securities Investment grade Security | Dec. 31, 2011 Corporate debt securities Non-investment grade Security | Dec. 31, 2010 Corporate debt securities Non-investment grade Security | Dec. 31, 2011 Municipal security Security | Dec. 31, 2011 Other securities Security | Dec. 31, 2010 Other securities Security | Dec. 31, 2011 Trust Preferred Securities Security | Dec. 31, 2010 Trust Preferred Securities Security | Dec. 31, 2009 Trust Preferred Securities Security
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of available for sale securities | $ 3,072,578,000 | $ 2,875,941,000 |  |  |  |  |  | $ 6,254,000 |  |  | $ 1,322,561,000 | $ 1,056,867,000 | $ 19,615,000 | [1] | $ 38,730,000 | [1] | $ 79,946,000 | $ 10,068,000 | $ 94,325,000 |  |  |
Continuous unrealized loss position 12 months or more, fair value | 359,776,000 | 16,180,000 |  |  |  |  |  | 6,254,000 |  | 6,300,000 | 350,181,000 |  | 9,595,000 |  | 9,926,000 |  |  |  |  | 9,600,000 | 9,900,000 |
Total investment securities available-for-sale portfolio (as a percent) |  |  |  |  |  |  |  |  |  |  | 43.00% |  |  |  |  |  |  |  |  | 1.00% |  |
Number of securities in a continuous unrealized loss position for more than twelve months | 24 | 6 |  |  |  |  |  |  |  | 1 | 19 |  |  |  |  |  |  |  |  | 5 | 5 |
Number of securities for which noncredit-related impairment losses have been recorded during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 14
Cumulative impact, before taxes, of implementation of new accounting principle on retained earnings |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative impact, net of taxes, of implementation of new accounting principle on retained earnings |  |  |  | 8,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual securities with a continuous unrealized loss position less than 12 months | 116 | 129 |  |  | 5 | 33 | 16 |  |  |  | 89 | 46 | 4 |  | 8 |  | 1 | 1 | 42 |  |  |
Percentage of total amortized cost basis of these securities |  |  |  |  |  |  |  |  |  |  |  |  | 52.00% |  |  |  |  |  |  |  |  |
Gross Unrealized Losses | (107,746,000) | (48,852,000) |  |  |  |  |  | (8,742,000) |  | (8,700,000) | (95,610,000) | (8,765,000) | (11,078,000) | [1] | (11,316,000) | [1] | (5,000) | (2,000) | (1,908,000) |  |  |
Gross unrealized losses in loss position twelve months or more | 44,188,000 | 19,435,000 |  |  |  |  |  | 8,742,000 |  |  | 33,675,000 |  | 10,513,000 |  | 10,693,000 |  |  |  |  |  |  |
Gross unrealized losses, trust preferred securities, portion representing impairment loss on securities not other-than-temporarily-impaired |  |  |  |  |  |  |  |  |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |
Gross unrealized losses, trust preferred securities, portion representing non-credit impairment loss on securities other-than-temporarily-impaired |  |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |
Impairment loss relating to additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 633,000 |  |
Noncredit-related impairment losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,700,000 | 14,100,000
Number of private-label available-for-sale mortgage-backed securities sold |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Net impairment loss on investment securities available-for-sale recognized in earnings | 633,000 | 16,669,000 | 107,671,000 |  |  |  |  |  | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of investment securities available-for sale, amortized cost basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year | 708,317,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after one year through five years | 372,837,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after five years through ten years | 1,001,425,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after ten years | 1,050,389,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment securities available-for-sale | 3,132,968,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled maturities of investment securities available-for sale, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year | 704,059,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after one year through five years | 357,446,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after five years through ten years | 933,429,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after ten years | 1,077,644,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment securities available-for-sale | 3,072,578,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of available-for-sale securities | 702,616,000 | 1,338,910,000 | 1,650,680,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gains on sale of securities | 9,703,000 | 31,237,000 | 11,923,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense on the sale of investment securities | 4,100,000 | 13,100,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of securities pledged to secure public deposits | 2,170,000,000 | 1,880,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities transferred to available for sale securities |  |  | $ 681,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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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