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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 345,071 | $ 1,110,832
12 Months or Longer | 377,185 | 4,520
Total | 722,256 | 1,115,352
Gross Unrealized Losses |  |
Less Than 12 Months | (2,970) | (28,322)
12 Months or Longer | (11,671) | (116)
Total | (14,641) | (28,438)
Fair Value |  |
Less Than 12 Months |  | 80,184
12 Months or Longer |  | 56,095
Total |  | 136,279
Gross Unrealized Losses |  |
Less Than 12 Months |  | (1,878)
12 Months or Longer |  | (55)
Total |  | (1,933)
SBA loan pool securities |  |
Fair Value |  |
Less Than 12 Months |  | 1,221
12 Months or Longer |  | 0
Total |  | 1,221
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 0
Total |  | 0
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 119,103 | 805,803
12 Months or Longer | 366,014 | 760
Total | 485,117 | 806,563
Gross Unrealized Losses |  |
Less Than 12 Months | (2,436) | (23,410)
12 Months or Longer | (11,660) | (8)
Total | (14,096) | (23,418)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 116,216
12 Months or Longer | 209 | 230
Total | 209 | 116,446
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (4,238)
12 Months or Longer | (1) | 0
Total | (1) | (4,238)
Non-agency commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 21,771 |
12 Months or Longer | 0 |
Total | 21,771 |
Gross Unrealized Losses |  |
Less Than 12 Months | (180) |
12 Months or Longer | 0 |
Total | (180) |
Fair Value |  |
Less Than 12 Months |  | 60,221
12 Months or Longer |  | 0
Total |  | 60,221
Gross Unrealized Losses |  |
Less Than 12 Months |  | (1,781)
12 Months or Longer |  | 0
Total |  | (1,781)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 204,197 | 187,592
12 Months or Longer | 10,962 | 0
Total | 215,159 | 187,592
Gross Unrealized Losses |  |
Less Than 12 Months | (354) | (674)
12 Months or Longer | (10) | 0
Total | $ (364) | (674)
Fair Value |  |
Less Than 12 Months |  | 10,056
12 Months or Longer |  | 56,095
Total |  | 66,151
Gross Unrealized Losses |  |
Less Than 12 Months |  | (6)
12 Months or Longer |  | (55)
Total |  | (61)
Corporate debt securities |  |
Fair Value |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 3,530
Total |  | 3,530
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | (108)
Total |  | (108)
Fair Value |  |
Less Than 12 Months |  | 9,907
12 Months or Longer |  | 0
Total |  | 9,907
Gross Unrealized Losses |  |
Less Than 12 Months |  | (91)
12 Months or Longer |  | 0
Total |  | $ (91)

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