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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 180,612 | $ 190,527
12 Months or Longer | 564,684 | 668,808
Total | 745,296 | 859,335
Gross Unrealized Losses |  |
Less Than 12 Months | (8,166) | (2,223)
12 Months or Longer | (73,921) | (14,797)
Total | (82,087) | (17,020)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 104,520 | 35,872
12 Months or Longer | 0 | 0
Total | 104,520 | 35,872
Gross Unrealized Losses |  |
Less Than 12 Months | (1,677) | (1,157)
12 Months or Longer | 0 | 0
Total | (1,677) | (1,157)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 73,379
12 Months or Longer |  | 0
Total |  | 73,379
Gross Unrealized Losses |  |
Less Than 12 Months |  | (260)
12 Months or Longer |  | 0
Total |  | (260)
Municipal securities |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 31,723
12 Months or Longer |  | 0
Total |  | 31,723
Gross Unrealized Losses |  |
Less Than 12 Months |  | (359)
12 Months or Longer |  | 0
Total |  | (359)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 160 |
12 Months or Longer | 0 |
Total | 160 |
Gross Unrealized Losses |  |
Less Than 12 Months | (3) |
12 Months or Longer | 0 |
Total | (3) |
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 58,887 | 49,553
12 Months or Longer | 564,684 | 668,808
Total | 623,571 | 718,361
Gross Unrealized Losses |  |
Less Than 12 Months | (6,113) | (447)
12 Months or Longer | (73,921) | (14,797)
Total | (80,034) | $ (15,244)
Corporate debt securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 17,045 |
12 Months or Longer | 0 |
Total | 17,045 |
Gross Unrealized Losses |  |
Less Than 12 Months | (373) |
12 Months or Longer | 0 |
Total | $ (373) |

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