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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 465,641 | $ 109,214
12 Months or Longer | 436,801 | 470,240
Total | 902,442 | 579,454
Gross Unrealized Losses |  |
Less Than 12 Months | (6,103) | (301)
12 Months or Longer | (28,340) | (15,302)
Total | (34,443) | (15,603)
SBA loan pools securities |  |
Fair Value |  |
Less Than 12 Months | 966 |
12 Months or Longer | 0 |
Total | 966 |
Gross Unrealized Losses |  |
Less Than 12 Months | (15) |
12 Months or Longer | 0 |
Total | (15) |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 16,907 | 4,880
12 Months or Longer | 436,740 | 470,092
Total | 453,647 | 474,972
Gross Unrealized Losses |  |
Less Than 12 Months | (374) | (35)
12 Months or Longer | (28,339) | (15,301)
Total | (28,713) | (15,336)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 95 | 0
12 Months or Longer | 61 | 148
Total | 156 | 148
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | 0
12 Months or Longer | (1) | (1)
Total | (2) | (1)
Non-agency commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 152,392 |
12 Months or Longer | 0 |
Total | 152,392 |
Gross Unrealized Losses |  |
Less Than 12 Months | (2,619) |
12 Months or Longer | 0 |
Total | (2,619) |
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 295,281 | 104,334
12 Months or Longer | 0 | 0
Total | 295,281 | 104,334
Gross Unrealized Losses |  |
Less Than 12 Months | (3,094) | (266)
12 Months or Longer | 0 | 0
Total | $ (3,094) | $ (266)

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