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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 484,079 | $ 109,214
12 Months or Longer | 424,461 | 470,240
Total | 908,540 | 579,454
Gross Unrealized Losses |  |
Less Than 12 Months | (5,181) | (301)
12 Months or Longer | (32,737) | (15,302)
Total | (37,918) | (15,603)
SBA loan pools securities |  |
Fair Value |  |
Less Than 12 Months | 888 |
12 Months or Longer | 0 |
Total | 888 |
Gross Unrealized Losses |  |
Less Than 12 Months | (22) |
12 Months or Longer | 0 |
Total | (22) |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 14,964 | 4,880
12 Months or Longer | 424,417 | 470,092
Total | 439,381 | 474,972
Gross Unrealized Losses |  |
Less Than 12 Months | (376) | (35)
12 Months or Longer | (32,737) | (15,301)
Total | (33,113) | (15,336)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 78 | 0
12 Months or Longer | 44 | 148
Total | 122 | 148
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | (1)
Total | 0 | (1)
Non-agency commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 132,703 |
12 Months or Longer | 0 |
Total | 132,703 |
Gross Unrealized Losses |  |
Less Than 12 Months | (2,854) |
12 Months or Longer | 0 |
Total | (2,854) |
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 335,446 | 104,334
12 Months or Longer | 0 | 0
Total | 335,446 | 104,334
Gross Unrealized Losses |  |
Less Than 12 Months | (1,929) | (266)
12 Months or Longer | 0 | 0
Total | $ (1,929) | $ (266)

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