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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available-for-sale |  |
Total available-for-sale investment securities | $ 3,205,238 | $ 3,773,226
U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 516,755 | 998,515
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 788,935 | 768,849
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 | 326,987 | 351,662
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 | 935,099 | 997,396
Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 159,426 | 175,649
Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 59,899 | 62,393
Corporate debt securities | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 365,905 | 364,713
Corporate debt securities | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 7,924 | 9,642
Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 44,308 | 44,407
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 | 552,967 | 1,034,150
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 | 516,755 | 998,515
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 | 36,212 | 35,635
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 2,652,271 | 2,739,076
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative assets | 54 |
Derivative liabilities | (1,038) | (5,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets |  | 2,365
Derivative liabilities | (430) |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options |  |
Derivative |  |
Derivative assets | 129,599 | 67,215
Derivative liabilities | (130,420) | (67,325)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 8,817 | 10,254
Derivative liabilities | (6,196) | (9,350)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit risk participation agreements (“RPAs”) |  |
Derivative |  |
Derivative liabilities | (11) | (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 | 788,935 | 768,849
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 | 326,987 | 351,662
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 | 935,099 | 997,396
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 159,426 | 175,649
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 59,899 | 62,393
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 | 365,905 | 364,713
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 | 7,924 | 9,642
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 8,096 | 8,772
Fair Value, Measurements, Recurring | Fair Value Measurements |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 3,205,238 | 3,773,226
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps on certificates of deposit |  |
Derivative |  |
Derivative assets | 54 |
Derivative liabilities | (1,038) | (5,213)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign currency forward contracts |  |
Derivative |  |
Derivative assets |  | 2,365
Derivative liabilities | (430) |
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and options |  |
Derivative |  |
Derivative assets | 129,599 | 67,215
Derivative liabilities | (130,420) | (67,325)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts |  |
Derivative |  |
Derivative assets | 8,817 | 10,254
Derivative liabilities | (6,196) | (9,350)
Fair Value, Measurements, Recurring | Fair Value Measurements | Credit risk participation agreements (“RPAs”) |  |
Derivative |  |
Derivative liabilities | (11) | (4)
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 516,755 | 998,515
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 | 788,935 | 768,849
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 | 326,987 | 351,662
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 | 935,099 | 997,396
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 159,426 | 175,649
Fair Value, Measurements, Recurring | Fair Value Measurements | Non-agency residential mortgage-backed securities | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 59,899 | 62,393
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 365,905 | 364,713
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Non-investment grade |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | 7,924 | 9,642
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities |  |
Investment securities available-for-sale |  |
Total available-for-sale investment securities | $ 44,308 | $ 44,407

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