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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity: |  |
Amortized Cost | $ 0 | $ 884,234
Gross Unrealized Gains |  | 17,442
Gross Unrealized Losses |  | (1,933)
Fair Value |  | 899,743
Securities available-for-sale: |  |
Amortized Cost | 2,899,899 | 2,396,968
Gross Unrealized Gains | 33,863 | 12,958
Gross Unrealized Losses | (18,659) | (28,438)
Fair Value | 2,915,103 | 2,381,488
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,138 | 1,221
Gross Unrealized Gains | 11 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,149 | 1,221
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 513,698 | 830,682
Gross Unrealized Gains | 9 | 9
Gross Unrealized Losses | (16,902) | (23,418)
Fair Value | 496,805 | 807,273
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 936 | 121,397
Gross Unrealized Gains | 17 | 18
Gross Unrealized Losses | (2) | (4,238)
Fair Value | 951 | 117,177
Non-agency commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 305,552 |
Gross Unrealized Gains | 5,287 |
Gross Unrealized Losses | (721) |
Fair Value | 310,118 |
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 1,836,302 | 1,395,094
Gross Unrealized Gains | 12,062 | 12,449
Gross Unrealized Losses | (994) | (674)
Fair Value | 1,847,370 | 1,406,869
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 242,273 | 48,574
Gross Unrealized Gains | 16,477 | 482
Gross Unrealized Losses | (40) | (108)
Fair Value | $ 258,710 | 48,948
Non-agency commercial mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 305,918
Gross Unrealized Gains |  | 2,949
Gross Unrealized Losses |  | (1,781)
Fair Value |  | 307,086
Collateralized loan obligations |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 338,226
Gross Unrealized Gains |  | 1,461
Gross Unrealized Losses |  | (61)
Fair Value |  | 339,626
Corporate debt securities |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 240,090
Gross Unrealized Gains |  | 13,032
Gross Unrealized Losses |  | (91)
Fair Value |  | $ 253,031

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