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INVESTMENT SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | $ 419,613 |  | $ 419,613 |  | $ 1,803,074
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (3,377) |  | (45,167)
Continuous unrealized loss position 12 months or more, fair value | 957,984 |  | 957,984 |  | 250,361
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (20,709) |  | (19,729)
Continuous unrealized loss position total, fair value | 1,377,597 |  | 1,377,597 |  | 2,053,435
Continuous unrealized loss position total, unrealized losses |  |  | (24,086) |  | (64,896)
Impairment Loss | 0 | 0 | 0 | 0 | 0
U.S. Treasury securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 130,631 |  | 130,631 |  | 337,248
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (276) |  | (3,622)
Continuous unrealized loss position 12 months or more, fair value | 183,673 |  | 183,673 |  |
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (2,077) |  |
Continuous unrealized loss position total, fair value | 314,304 |  | 314,304 |  | 337,248
Continuous unrealized loss position total, unrealized losses |  |  | (2,353) |  | (3,622)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 108,393 |  | 108,393 |  | 387,097
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (1,281) |  | (12,726)
Continuous unrealized loss position 12 months or more, fair value | 172,113 |  | 172,113 |  |
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (3,006) |  |
Continuous unrealized loss position total, fair value | 280,506 |  | 280,506 |  | 387,097
Continuous unrealized loss position total, unrealized losses |  |  | (4,287) |  | (12,726)
Total investment securities available-for-sale portfolio (as a percent) | 16.00% |  | 16.00% |  | 14.00%
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 52,082 |  | 52,082 |  | 114,754
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (655) |  | (3,280)
Continuous unrealized loss position 12 months or more, fair value | 28,859 |  | 28,859 |  | 16,065
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (899) |  | (1,169)
Continuous unrealized loss position total, fair value | 80,941 |  | 80,941 |  | 130,819
Continuous unrealized loss position total, unrealized losses |  |  | (1,554) |  | (4,449)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 107,182 |  | 107,182 |  | 502,285
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (616) |  | (10,570)
Continuous unrealized loss position 12 months or more, fair value | 326,003 |  | 326,003 |  | 92,540
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (7,442) |  | (4,357)
Continuous unrealized loss position total, fair value | 433,185 |  | 433,185 |  | 594,825
Continuous unrealized loss position total, unrealized losses |  |  | (8,058) |  | (14,927)
Total investment securities available-for-sale portfolio (as a percent) | 29.00% |  | 29.00% |  | 32.00%
Municipal securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 5,260 |  | 5,260 |  | 173,782
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (14) |  | (10,765)
Continuous unrealized loss position 12 months or more, fair value | 108,407 |  | 108,407 |  | 47,892
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (2,521) |  | (6,768)
Continuous unrealized loss position total, fair value | 113,667 |  | 113,667 |  | 221,674
Continuous unrealized loss position total, unrealized losses |  |  | (2,535) |  | (17,533)
Other residential mortgage-backed securities: | Investment grade |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value |  |  |  |  | 46,328
Continuous unrealized loss position less than 12 months, unrealized losses |  |  |  |  | (1,802)
Continuous unrealized loss position 12 months or more, fair value | 14,054 |  | 14,054 |  |
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (356) |  |
Continuous unrealized loss position total, fair value | 14,054 |  | 14,054 |  | 46,328
Continuous unrealized loss position total, unrealized losses |  |  | (356) |  | (1,802)
Corporate debt securities | Investment grade |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value |  |  |  |  | 193,482
Continuous unrealized loss position less than 12 months, unrealized losses |  |  |  |  | (1,538)
Continuous unrealized loss position 12 months or more, fair value | 109,695 |  | 109,695 |  | 79,442
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (1,445) |  | (1,806)
Continuous unrealized loss position total, fair value | 109,695 |  | 109,695 |  | 272,924
Continuous unrealized loss position total, unrealized losses |  |  | (1,445) |  | (3,344)
Corporate debt securities | Non-investment grade |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position 12 months or more, fair value | 15,180 |  | 15,180 |  | 14,422
Continuous unrealized loss position 12 months or more, unrealized losses |  |  | (2,963) |  | (5,629)
Continuous unrealized loss position total, fair value | 15,180 |  | 15,180 |  | 14,422
Continuous unrealized loss position total, unrealized losses |  |  | (2,963) |  | (5,629)
Total investment securities available-for-sale portfolio (as a percent) | 1.00% |  | 1.00% |  | 1.00%
Other securities |  |  |  |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |  |  |  |
Continuous unrealized loss position less than 12 months, fair value | 16,065 |  | 16,065 |  | 48,098
Continuous unrealized loss position less than 12 months, unrealized losses |  |  | (535) |  | (864)
Continuous unrealized loss position total, fair value | 16,065 |  | 16,065 |  | 48,098
Continuous unrealized loss position total, unrealized losses |  |  | $ (535) |  | $ (864)

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