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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 479,083 | $ 878,890
12 Months or Longer | 5,300 | 0
Total | 484,383 | 878,890
Gross Unrealized Losses |  |
Less Than 12 Months | (7,456) | (30,214)
12 Months or Longer | (82) | 0
Total | (7,538) | (30,214)
Fair Value |  |
Less Than 12 Months | 364,930 | 698,170
12 Months or Longer | 2,724 | 7,235
Total | 367,654 | 705,405
Gross Unrealized Losses |  |
Less Than 12 Months | (1,453) | (5,246)
12 Months or Longer | (23) | (124)
Total | (1,476) | (5,370)
Private label residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 125 | 0
12 Months or Longer | 317 | 403
Total | 442 | 403
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | (3) | (1)
Total | (3) | (1)
Corporate bonds |  |
Fair Value |  |
Less Than 12 Months | 49,682 | 190,332
12 Months or Longer | 5,300 | 0
Total | 54,982 | 190,332
Gross Unrealized Losses |  |
Less Than 12 Months | (490) | (20,946)
12 Months or Longer | (82) | 0
Total | (572) | (20,946)
Fair Value |  |
Less Than 12 Months | 13,828 | 26,152
12 Months or Longer | 0 | 0
Total | 13,828 | 26,152
Gross Unrealized Losses |  |
Less Than 12 Months | (339) | (505)
12 Months or Longer | 0 | 0
Total | (339) | (505)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 409,630 | 411,207
12 Months or Longer | 0 | 0
Total | 409,630 | 411,207
Gross Unrealized Losses |  |
Less Than 12 Months | (6,692) | (5,077)
12 Months or Longer | 0 | 0
Total | (6,692) | (5,077)
Fair Value |  |
Less Than 12 Months | 229,478 | 72,204
12 Months or Longer | 0 | 0
Total | 229,478 | 72,204
Gross Unrealized Losses |  |
Less Than 12 Months | (939) | (282)
12 Months or Longer | 0 | 0
Total | (939) | (282)
Commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 19,771 | 277,351
12 Months or Longer | 0 | 0
Total | 19,771 | 277,351
Gross Unrealized Losses |  |
Less Than 12 Months | (274) | (4,191)
12 Months or Longer | 0 | 0
Total | (274) | (4,191)
Agency mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 121,499 | 599,814
12 Months or Longer | 2,407 | 6,832
Total | 123,906 | 606,646
Gross Unrealized Losses |  |
Less Than 12 Months | (175) | (4,459)
12 Months or Longer | (20) | (123)
Total | $ (195) | $ (4,582)

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