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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Sep. 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 | 2,742,297 | 2,396,968
Gross Unrealized Gains | 28,008 | 12,958
Gross Unrealized Losses | (14,641) | (28,438)
Fair Value | 2,755,664 | 2,381,488
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,056 | 1,221
Gross Unrealized Gains | 9 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,065 | 1,221
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 503,193 | 830,682
Gross Unrealized Gains | 20 | 9
Gross Unrealized Losses | (14,096) | (23,418)
Fair Value | 489,117 | 807,273
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 844 | 121,397
Gross Unrealized Gains | 16 | 18
Gross Unrealized Losses | (1) | (4,238)
Fair Value | 859 | 117,177
Non-agency commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 305,360 |
Gross Unrealized Gains | 5,737 |
Gross Unrealized Losses | (180) |
Fair Value | 310,917 |
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 1,808,126 | 1,395,094
Gross Unrealized Gains | 11,429 | 12,449
Gross Unrealized Losses | (364) | (674)
Fair Value | 1,819,191 | 1,406,869
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 123,718 | 48,574
Gross Unrealized Gains | 10,797 | 482
Gross Unrealized Losses | 0 | (108)
Fair Value | $ 134,515 | 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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