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INVESTMENT SECURITIES (Details 5) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 item | Dec. 31, 2013 item
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | $ 2,474,744 |  | $ 2,733,797 |
Number of securities in a continuous unrealized loss position for more than twelve months | 75 |  | 65 |
Unrealized losses in loss position for twelve months or more | (17,551) |  | (19,729) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 179 |  | 239 |
Unrealized losses in loss position for less than twelve months | (27,692) |  | (45,167) |
Continuous unrealized loss position 12 months or more, fair value | 294,599 |  | 250,361 |
US Government Agencies and Government Sponsored Enterprise Debt Securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities |  |  | 394,300 |
Total investment securities available-for-sale portfolio (as a percent) | 16.00% |  | 14.00% |
Number of individual securities with a continuous unrealized loss position less than 12 months | 9 |  | 16 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 824,105 |  | 885,237 |
Total investment securities available-for-sale portfolio (as a percent) | 33.00% |  | 32.00% |
Number of securities in a continuous unrealized loss position for more than twelve months | 23 |  | 21 |
Unrealized losses in loss position for twelve months or more | (4,784) |  | (4,357) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 47 |  | 55 |
Unrealized losses in loss position for less than twelve months | (7,447) |  | (10,570) |
Continuous unrealized loss position 12 months or more, fair value | 119,255 |  | 92,540 |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 283,897 |  | 280,979 |
Total investment securities available-for-sale portfolio (as a percent) | 11.00% |  | 10.00% |
Number of securities in a continuous unrealized loss position for more than twelve months | 40 |  | 32 |
Unrealized losses in loss position for twelve months or more | (5,079) |  | (6,768) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 62 |  | 94 |
Unrealized losses in loss position for less than twelve months | (4,462) |  | (10,765) |
Continuous unrealized loss position 12 months or more, fair value | 64,839 |  | 47,892 |
Trust Preferred Securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Number of securities in a continuous unrealized loss position for more than twelve months |  |  | 5 |
Unrealized losses in loss position for twelve months or more |  |  | (14,400) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 5 |  |  |
Continuous unrealized loss position 12 months or more, fair value |  |  | 14,400 |
Trust Preferred Securities | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
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 |  |  |
Continuous unrealized loss position 12 months or more, fair value | 14,900 |  |  |
Other securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 101,068 |  | 79,716 |
Number of individual securities with a continuous unrealized loss position less than 12 months | 3 |  | 9 |
Unrealized losses in loss position for less than twelve months | (619) |  | (864) |
Corporate debt securities | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 209,691 |  | 309,995 |
Number of securities in a continuous unrealized loss position for more than twelve months | 4 |  | 4 |
Unrealized losses in loss position for twelve months or more | (1,686) |  | (1,806) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 5 |  | 8 |
Unrealized losses in loss position for less than twelve months | (1,276) |  | (1,538) |
Continuous unrealized loss position 12 months or more, fair value | 79,554 |  | 79,442 |
Corporate debt securities | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 15,512 | [1] | 15,101 | [1]
Unrealized losses in loss position for twelve months or more | (5,093) |  | (5,629) |
Continuous unrealized loss position 12 months or more, fair value | 14,869 |  | 14,422 |
Percentage of total amortized cost basis of these securities | 26.00% |  |  |
U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 428,253 |  | 491,632 |
Number of individual securities with a continuous unrealized loss position less than 12 months | 34 |  | 33 |
Unrealized losses in loss position for less than twelve months | (3,145) |  | (3,622) |
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 | 119,107 |  | 178,870 |
Number of securities in a continuous unrealized loss position for more than twelve months | 3 |  | 3 |
Unrealized losses in loss position for twelve months or more | (909) |  | (1,169) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 13 |  | 19 |
Unrealized losses in loss position for less than twelve months | (1,752) |  | (3,280) |
Continuous unrealized loss position 12 months or more, fair value | 16,082 |  | 16,065 |
Other residential mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | 57,007 |  | 46,327 |
Number of individual securities with a continuous unrealized loss position less than 12 months | 6 |  | 5 |
Unrealized losses in loss position for less than twelve months | (1,443) |  | (1,802) |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Fair value of available for sale securities | $ 51,419 |  | $ 51,617 |
[1] | For the three months ended March 31, 2014 and the year ended December 31, 2013, the Company did not record any OTTI.

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