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INVESTMENT SECURITIES (Details 5) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2013 item | Dec. 31, 2012 item
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | $ 2,588,993,000 |  | $ 2,607,029,000 |
Continuous unrealized loss position 12 months or more, fair value |  | 118,665,000 |  | 195,271,000 |
Number of securities in a continuous unrealized loss position for more than twelve months |  | 10 |  | 13 |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 117 |  | 77 |
Gross unrealized losses in loss position twelve months or more |  | (11,402,000) |  | (19,739,000) |
US Government Agencies and Government Sponsored Enterprise Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 1 |  | 1 |
Residential mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 31 |  | 26 |
Corporate debt securities | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 453,323,000 |  | 411,983,000 |
Continuous unrealized loss position 12 months or more, fair value |  | 105,279,000 |  | 182,697,000 |
Total investment securities available-for-sale portfolio (as a percent) |  | 18.00% |  | 16.00% |
Number of securities in a continuous unrealized loss position for more than twelve months |  | 5 |  | 8 |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 4 |  | 11 |
Gross unrealized losses in loss position twelve months or more |  | (4,721,000) |  | (12,181,000) |
Corporate debt securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 18,000,000 | [1] | 17,417,000 | [1]
Continuous unrealized loss position 12 months or more, fair value |  | 13,386,000 |  | 12,574,000 |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 1 |  |  |
Percentage of total amortized cost basis of these securities |  | 33.00% |  |  |
Gross unrealized losses in loss position twelve months or more |  | (6,681,000) |  | (7,558,000) |
Gross unrealized losses, trust preferred securities, portion representing impairment loss on securities not other-than-temporarily-impaired | 5,600,000 |  |  |  |
Gross unrealized losses, trust preferred securities, portion representing non-credit impairment loss on securities other-than-temporarily-impaired | 5,100,000 |  |  |  |
Trust Preferred Securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Continuous unrealized loss position 12 months or more, fair value |  | 13,400,000 |  | 12,600,000 |
Total investment securities available-for-sale portfolio (as a percent) |  | 1.00% |  |  |
Number of securities in a continuous unrealized loss position for more than twelve months |  | 5 |  | 5 |
Impairment loss relating to additional increases to the amount related to the credit loss for which an other-than-temporary impairment was previously recognized | 99,000 |  |  |  |
Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 206,758,000 |  | 167,093,000 |
Total investment securities available-for-sale portfolio (as a percent) |  | 8.00% |  | 6.00% |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 68 |  | 29 |
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 10,793,000 |  | 10,170,000 |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 470,764,000 |  | 460,677,000 |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 5 |  | 9 |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | 51,359,000 |  | 17,084,000 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities |  | $ 145,044,000 |  | $ 180,665,000 |
Number of individual securities with a continuous unrealized loss position less than 12 months |  | 7 |  | 1 |
[1] | For the three months ended March 31, 2013, the Company did not record any OTTI. 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 for the year ended December 31, 2012.

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