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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 789,246 | $ 2,026,686
Gross Unrealized Gains | 10 | 150
Gross Unrealized Losses | (13,594) | (34,336)
Fair Value | 775,662 | 1,992,500
SBA loan pools securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost |  | 911
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Value |  | 910
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 | 40,374 | 461,987
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (24,545)
Fair Value | 40,374 | 437,442
Non-agency residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 267 | 418
Gross Unrealized Gains | 10 | 9
Gross Unrealized Losses | 0 | 0
Fair Value | 277 | 427
Non-agency commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost |  | 132,199
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 132,199
Collateralized loan obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 748,605 | 1,431,171
Gross Unrealized Gains | 0 | 141
Gross Unrealized Losses | (13,594) | (9,790)
Fair Value | $ 735,011 | $ 1,421,522

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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=118939692&loc=d3e27161-111563 + Details
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