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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 435,191 | $ 1,377,901
12 Months or Longer | 299,820 | 457,632
Total | 735,011 | 1,835,533
Gross Unrealized Losses |  |
Less Than 12 Months | (6,539) | (9,613)
12 Months or Longer | (7,055) | (24,723)
Total | (13,594) | (34,336)
SBA loan pools securities |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 910
Total |  | 910
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | (1)
Total |  | (1)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 13,494
12 Months or Longer |  | 423,916
Total |  | 437,410
Gross Unrealized Losses |  |
Less Than 12 Months |  | (133)
12 Months or Longer |  | (24,412)
Total |  | (24,545)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 90
12 Months or Longer |  | 16
Total |  | 106
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 0
Total |  | 0
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 435,191 | 1,364,317
12 Months or Longer | 299,820 | 32,790
Total | 735,011 | 1,397,107
Gross Unrealized Losses |  |
Less Than 12 Months | (6,539) | (9,480)
12 Months or Longer | (7,055) | (310)
Total | $ (13,594) | $ (9,790)

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