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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available-for-sale |  |
Total available-for-sale investment securities | $ 3,773,226 | $ 2,626,617
U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 998,515 | 873,435
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 768,849 | 311,024
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 351,662 | 141,420
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 997,396 | 791,088
Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 175,649 | 250,448
Other residential mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 62,393 | 53,918
Other commercial mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities |  | 34,053
Corporate debt securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 364,713 | 115,182
Corporate debt securities: | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 9,642 | 14,681
Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 44,407 | 41,368
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 1,034,150 | 905,792
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 998,515 | 873,435
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 35,635 | 32,357
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 2,739,076 | 1,714,297
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets | 2,365 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | 5,213 | 9,922
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange options |  |
Derivative |  |
Derivative assets |  | 6,136
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and caps |  |
Derivative |  |
Derivative assets | 67,215 | 41,534
Derivative liabilities | 67,325 | 41,779
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 10,254 | 8,118
Derivative liabilities | 9,350 | 9,163
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements (“RPA”) |  |
Derivative |  |
Derivative liabilities | 4 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 768,849 | 311,024
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 351,662 | 141,420
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 997,396 | 791,088
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 175,649 | 250,448
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other residential mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 62,393 | 53,918
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other commercial mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities |  | 34,053
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 364,713 | 115,182
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities: | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 9,642 | 8,153
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 8,772 | 9,011
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 0 | 6,528
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities |  |
Derivative |  |
Derivative liabilities |  | 3,392
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities: | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 0 | 6,528
Fair Value, Measurements, Recurring | Fair Value Measurements |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 3,773,226 | 2,626,617
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets | 2,365 |
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative liabilities | 5,213 | 9,922
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange options |  |
Derivative |  |
Derivative assets |  | 6,136
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and caps |  |
Derivative |  |
Derivative assets | 67,215 | 41,534
Derivative liabilities | 67,325 | 41,779
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 10,254 | 8,118
Derivative liabilities | 9,350 | 9,163
Fair Value, Measurements, Recurring | Fair Value Measurements | Credit risk participation agreements (“RPA”) |  |
Derivative |  |
Derivative liabilities | 4 |
Fair Value, Measurements, Recurring | Fair Value Measurements | Embedded derivative liabilities |  |
Derivative |  |
Derivative liabilities |  | 3,392
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 998,515 | 873,435
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 768,849 | 311,024
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 351,662 | 141,420
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 997,396 | 791,088
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 175,649 | 250,448
Fair Value, Measurements, Recurring | Fair Value Measurements | Other residential mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 62,393 | 53,918
Fair Value, Measurements, Recurring | Fair Value Measurements | Other commercial mortgage-backed securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities |  | 34,053
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities: | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 364,713 | 115,182
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities: | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 9,642 | 14,681
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 44,407 | 41,368
Derivative instruments not designated as hedging instruments |  |
Derivative |  |
Derivative assets | 77,469 | 55,788
Derivative liabilities | 76,679 | 54,334
Derivative instruments not designated as hedging instruments | Foreign exchange options |  |
Derivative |  |
Derivative assets | 0 | 6,136
Derivative liabilities | 0 | 0
Derivative instruments not designated as hedging instruments | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 10,254 | 8,118
Derivative liabilities | 9,350 | 9,163
Derivative instruments not designated as hedging instruments | Credit risk participation agreements (“RPA”) |  |
Derivative |  |
Derivative assets | 0 | 0
Derivative liabilities | 4 | 0
Derivative instruments not designated as hedging instruments | Embedded derivative liabilities |  |
Derivative |  |
Derivative assets | 0 | 0
Derivative liabilities | $ 0 | $ 3,392

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