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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 878,890 |
12 Months or Longer | 0 |
Total | 878,890 |
Gross Unrealized Losses |  |
Less Than 12 Months | (30,214) |
12 Months or Longer | 0 |
Total | (30,214) |
Fair Value |  |
Less Than 12 Months | 698,170 | $ 68,572
12 Months or Longer | 7,235 | 23,567
Total | 705,405 | 92,139
Gross Unrealized Losses |  |
Less Than 12 Months | (5,246) | (341)
12 Months or Longer | (124) | (277)
Total | (5,370) | (618)
Corporate bonds |  |
Fair Value |  |
Less Than 12 Months | 190,332 |
12 Months or Longer | 0 |
Total | 190,332 |
Gross Unrealized Losses |  |
Less Than 12 Months | (20,946) |
12 Months or Longer | 0 |
Total | (20,946) |
Fair Value |  |
Less Than 12 Months | 26,152 |
12 Months or Longer | 0 |
Total | 26,152 |
Gross Unrealized Losses |  |
Less Than 12 Months | (505) |
12 Months or Longer | 0 |
Total | (505) |
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 411,207 |
12 Months or Longer | 0 |
Total | 411,207 |
Gross Unrealized Losses |  |
Less Than 12 Months | (5,077) |
12 Months or Longer | 0 |
Total | (5,077) |
Fair Value |  |
Less Than 12 Months | 72,204 |
12 Months or Longer | 0 |
Total | 72,204 |
Gross Unrealized Losses |  |
Less Than 12 Months | (282) |
12 Months or Longer | 0 |
Total | (282) |
Commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 277,351 |
12 Months or Longer | 0 |
Total | 277,351 |
Gross Unrealized Losses |  |
Less Than 12 Months | (4,191) |
12 Months or Longer | 0 |
Total | (4,191) |
Private label residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 372
12 Months or Longer | 403 | 1,355
Total | 403 | 1,727
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (9)
12 Months or Longer | (1) | (4)
Total | (1) | (13)
Agency mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 599,814 | 68,200
12 Months or Longer | 6,832 | 22,212
Total | 606,646 | 90,412
Gross Unrealized Losses |  |
Less Than 12 Months | (4,459) | (332)
12 Months or Longer | (123) | (273)
Total | $ (4,582) | $ (605)

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