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INVESTMENT SECURITIES (Details 5) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 item | Dec. 31, 2011 item | Dec. 31, 2013 item
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | $ 2,607,029 |  |  | $ 2,733,797 |
Number of securities in a continuous unrealized loss position for more than twelve months | 13 |  |  | 65 |
Unrealized losses in loss position for twelve months or more | (19,739) |  |  | (19,729) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 77 |  |  | 239 |
Unrealized losses in loss position for less than twelve months | (6,989) |  |  | (45,167) |
Continuous unrealized loss position 12 months or more, fair value | 195,271 |  |  | 250,361 |
Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | 167,093 |  |  | 280,979 |
Total investment securities available-for-sale portfolio (as a percent) |  |  |  | 10.00% |
Number of securities in a continuous unrealized loss position for more than twelve months |  |  |  | 32 |
Unrealized losses in loss position for twelve months or more |  |  |  | (6,768) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 29 |  |  | 94 |
Unrealized losses in loss position for less than twelve months | (731) |  |  | (10,765) |
Continuous unrealized loss position 12 months or more, fair value |  |  |  | 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 |  |  |  | (5,600) |
Noncredit-related impairment losses | 99 |  | 633 |  |
Number of securities for which noncredit-related impairment losses have been recorded during the period | 5 |  | 5 |  |
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 | 12,600 |  |  | 14,400 |
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 | 1,144,085 |  |  | 885,237 |
Total investment securities available-for-sale portfolio (as a percent) |  |  |  | 32.00% |
Number of securities in a continuous unrealized loss position for more than twelve months |  |  |  | 21 |
Unrealized losses in loss position for twelve months or more |  |  |  | (4,357) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 26 |  |  | 55 |
Unrealized losses in loss position for less than twelve months | (678) |  |  | (10,570) |
Continuous unrealized loss position 12 months or more, fair value |  |  |  | 92,540 |
Investment Grade Corporate debt and commercial agency mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Number of securities in a continuous unrealized loss position for more than twelve months |  |  |  | 7 |
Unrealized losses in loss position for twelve months or more |  |  |  | (2,900) |
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) |  |  |  | 14.00% |
Number of individual securities with a continuous unrealized loss position less than 12 months | 1 |  |  | 16 |
Unrealized losses in loss position for less than twelve months |  |  |  | (12,700) |
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | 10,170 |  |  | 79,716 |
Unrealized losses in loss position for less than twelve months |  |  |  | (864) |
Other securities | All other |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Number of individual securities with a continuous unrealized loss position less than 12 months |  |  |  | 74 |
Unrealized losses in loss position for less than twelve months |  |  |  | (11,100) |
Corporate debt securities | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | 411,983 |  |  | 309,995 |
Number of securities in a continuous unrealized loss position for more than twelve months | 8 |  |  |  |
Unrealized losses in loss position for twelve months or more | (12,181) |  |  | (1,806) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 11 |  |  |  |
Unrealized losses in loss position for less than twelve months | (5,391) |  |  | (1,538) |
Continuous unrealized loss position 12 months or more, fair value | 182,697 |  |  | 79,442 |
Corporate debt securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | 17,417 | [1] |  | 15,101 | [1]
Unrealized losses in loss position for twelve months or more | (7,558) |  |  | (5,629) |
Continuous unrealized loss position 12 months or more, fair value | 12,574 |  |  | 14,422 |
Percentage of total amortized cost basis of these securities |  |  |  | 28.00% |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Fair value of available for sale securities | 460,677 |  |  | 491,632 |
Number of individual securities with a continuous unrealized loss position less than 12 months | 9 |  |  |  |
Unrealized losses in loss position for less than twelve months | (71) |  |  | (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 | 180,665 |  |  | 178,870 |
Unrealized losses in loss position for twelve months or more |  |  |  | (1,169) |
Number of individual securities with a continuous unrealized loss position less than 12 months | 1 |  |  |  |
Unrealized losses in loss position for less than twelve months | (36) |  |  | (3,280) |
Continuous unrealized loss position 12 months or more, fair value |  |  |  | $ 16,065 |
[1] | For 2013, the Company did not record any OTTI. For 2012, 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.

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