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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 2,090,903 | $ 2,567,393
Gross Unrealized Gains | 6,847 | 23,679
Gross Unrealized Losses | (37,918) | (15,603)
Fair Value | 2,059,832 | 2,575,469
SBA loan pools securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 910 | 1,056
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (22) | 0
Fair Value | 888 | 1,058
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 472,581 | 492,255
Gross Unrealized Gains | 0 | 10
Gross Unrealized Losses | (33,113) | (15,336)
Fair Value | 439,468 | 476,929
Non-agency residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 439 | 741
Gross Unrealized Gains | 12 | 16
Gross Unrealized Losses | 0 | (1)
Fair Value | 451 | 756
Non-agency commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 135,558 | 305,172
Gross Unrealized Gains | 0 | 5,339
Gross Unrealized Losses | (2,854) | 0
Fair Value | 132,704 | 310,511
Collateralized loan obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 1,481,415 | 1,691,455
Gross Unrealized Gains | 6,835 | 11,129
Gross Unrealized Losses | (1,929) | (266)
Fair Value | $ 1,486,321 | 1,702,318
Corporate debt securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost |  | 76,714
Gross Unrealized Gains |  | 7,183
Gross Unrealized Losses |  | 0
Fair Value |  | $ 83,897

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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