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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 676,015 | $ 878,890
12 Months or Longer | 0 | 0
Total | 676,015 | 878,890
Gross Unrealized Losses |  |
Less Than 12 Months | (19,510) | (30,214)
12 Months or Longer | 0 | 0
Total | (19,510) | (30,214)
Fair Value |  |
Less Than 12 Months | 559,217 | 698,170
12 Months or Longer | 6,527 | 7,235
Total | 565,744 | 705,405
Gross Unrealized Losses |  |
Less Than 12 Months | (2,696) | (5,246)
12 Months or Longer | (26) | (124)
Total | (2,722) | (5,370)
Private label residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 1,138 | 0
12 Months or Longer | 0 | 403
Total | 1,138 | 403
Gross Unrealized Losses |  |
Less Than 12 Months | (4) | 0
12 Months or Longer | 0 | (1)
Total | (4) | (1)
Corporate bonds |  |
Fair Value |  |
Less Than 12 Months | 154,451 | 190,332
12 Months or Longer | 0 | 0
Total | 154,451 | 190,332
Gross Unrealized Losses |  |
Less Than 12 Months | (9,292) | (20,946)
12 Months or Longer | 0 | 0
Total | (9,292) | (20,946)
Fair Value |  |
Less Than 12 Months | 26,177 | 26,152
12 Months or Longer | 0 | 0
Total | 26,177 | 26,152
Gross Unrealized Losses |  |
Less Than 12 Months | (476) | (505)
12 Months or Longer | 0 | 0
Total | (476) | (505)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 408,365 | 411,207
12 Months or Longer | 0 | 0
Total | 408,365 | 411,207
Gross Unrealized Losses |  |
Less Than 12 Months | (7,950) | (5,077)
12 Months or Longer | 0 | 0
Total | (7,950) | (5,077)
Fair Value |  |
Less Than 12 Months | 431,250 | 72,204
12 Months or Longer | 0 | 0
Total | 431,250 | 72,204
Gross Unrealized Losses |  |
Less Than 12 Months | (1,944) | (282)
12 Months or Longer | 0 | 0
Total | (1,944) | (282)
Commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 113,199 | 277,351
12 Months or Longer | 0 | 0
Total | 113,199 | 277,351
Gross Unrealized Losses |  |
Less Than 12 Months | (2,268) | (4,191)
12 Months or Longer | 0 | 0
Total | (2,268) | (4,191)
Agency mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 100,652 | 599,814
12 Months or Longer | 6,527 | 6,832
Total | 107,179 | 606,646
Gross Unrealized Losses |  |
Less Than 12 Months | (272) | (4,459)
12 Months or Longer | (26) | (123)
Total | $ (298) | $ (4,582)

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