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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 497,963 | $ 1,377,901
12 Months or Longer | 609,915 | 457,632
Total | 1,107,878 | 1,835,533
Gross Unrealized Losses |  |
Less Than 12 Months | (6,664) | (9,613)
12 Months or Longer | (11,534) | (24,723)
Total | (18,198) | (34,336)
SBA loan pools securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | 910
Total | 0 | 910
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | (1)
Total | 0 | (1)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 13,494
12 Months or Longer | 370,676 | 423,916
Total | 370,676 | 437,410
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (133)
12 Months or Longer | (6,898) | (24,412)
Total | (6,898) | (24,545)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 90
12 Months or Longer | 0 | 16
Total | 0 | 106
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | 0
Total | 0 | 0
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 497,963 | 1,364,317
12 Months or Longer | 239,239 | 32,790
Total | 737,202 | 1,397,107
Gross Unrealized Losses |  |
Less Than 12 Months | (6,664) | (9,480)
12 Months or Longer | (4,636) | (310)
Total | $ (11,300) | $ (9,790)

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