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INVESTMENT SECURITIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | $ 2,599,018,000 |  |  | $ 2,786,490,000 |
Gross Unrealized Gains | 34,739,000 |  |  | 12,203,000 |
Gross Unrealized Losses | (26,728,000) |  |  | (64,896,000) |
Fair Value | 2,607,029,000 |  |  | 2,733,797,000 |
Other than temporary impairment, pre-tax basis, credit portion recognized in earnings | 99,000 |  | 633,000 |  |
Other than temporary impairment, pre-tax basis, non-credit portion recognized in other comprehensive income | 5,100,000 |  |  |  |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 459,613,000 |  |  | 495,053,000 |
Gross Unrealized Gains | 1,135,000 |  |  | 201,000 |
Gross Unrealized Losses | (71,000) |  |  | (3,622,000) |
Fair Value | 460,677,000 |  |  | 491,632,000 |
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 197,264,000 |  |  | 406,807,000 |
Gross Unrealized Gains | 673,000 |  |  | 242,000 |
Gross Unrealized Losses | (82,000) |  |  | (12,726,000) |
Fair Value | 197,855,000 |  |  | 394,323,000 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 174,036,000 |  |  | 182,257,000 |
Gross Unrealized Gains | 6,665,000 |  |  | 1,062,000 |
Gross Unrealized Losses | (36,000) |  |  | (4,449,000) |
Fair Value | 180,665,000 |  |  | 178,870,000 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 1,123,880,000 |  |  | 892,435,000 |
Gross Unrealized Gains | 20,883,000 |  |  | 7,729,000 |
Gross Unrealized Losses | (678,000) |  |  | (14,927,000) |
Fair Value | 1,144,085,000 |  |  | 885,237,000 |
Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 163,333,000 |  |  | 297,390,000 |
Gross Unrealized Gains | 4,491,000 |  |  | 1,122,000 |
Gross Unrealized Losses | (731,000) |  |  | (17,533,000) |
Fair Value | 167,093,000 |  |  | 280,979,000 |
Other residential mortgage-backed securities: | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  |  |  | 48,129,000 |
Gross Unrealized Losses |  |  |  | (1,802,000) |
Fair Value |  |  |  | 46,327,000 |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 16,999,000 |  |  | 51,000,000 |
Gross Unrealized Gains | 85,000 |  |  | 617,000 |
Fair Value | 17,084,000 |  |  | 51,617,000 |
Corporate debt securities | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 429,318,000 |  |  | 312,726,000 |
Gross Unrealized Gains | 237,000 |  |  | 613,000 |
Gross Unrealized Losses | (17,572,000) |  |  | (3,344,000) |
Fair Value | 411,983,000 |  |  | 309,995,000 |
Corporate debt securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 24,620,000 | [1] |  | 20,668,000 | [1]
Gross Unrealized Gains | 355,000 | [1] |  | 62,000 | [1]
Gross Unrealized Losses | (7,558,000) | [1] |  | (5,629,000) | [1]
Fair Value | 17,417,000 | [1] |  | 15,101,000 | [1]
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost | 9,955,000 |  |  | 80,025,000 |
Gross Unrealized Gains | 215,000 |  |  | 555,000 |
Gross Unrealized Losses |  |  |  | (864,000) |
Fair Value | $ 10,170,000 |  |  | $ 79,716,000 |
[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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