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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 896,412 | $ 1,110,832
12 Months or Longer | 2,896 | 4,520
Total | 899,308 | 1,115,352
Gross Unrealized Losses |  |
Less Than 12 Months | (18,610) | (28,322)
12 Months or Longer | (49) | (116)
Total | (18,659) | (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 | 493,291 | 805,803
12 Months or Longer | 2,742 | 760
Total | 496,033 | 806,563
Gross Unrealized Losses |  |
Less Than 12 Months | (16,854) | (23,410)
12 Months or Longer | (48) | (8)
Total | (16,902) | (23,418)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 111 | 116,216
12 Months or Longer | 154 | 230
Total | 265 | 116,446
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | (4,238)
12 Months or Longer | (1) | 0
Total | (2) | (4,238)
Non-agency commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 56,563 |
12 Months or Longer | 0 |
Total | 56,563 |
Gross Unrealized Losses |  |
Less Than 12 Months | (721) |
12 Months or Longer | 0 |
Total | (721) |
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 | 344,724 | 187,592
12 Months or Longer | 0 | 0
Total | 344,724 | 187,592
Gross Unrealized Losses |  |
Less Than 12 Months | (994) | (674)
12 Months or Longer | 0 | 0
Total | (994) | (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 | 1,723 | 0
12 Months or Longer | 0 | 3,530
Total | 1,723 | 3,530
Gross Unrealized Losses |  |
Less Than 12 Months | (40) | 0
12 Months or Longer | 0 | (108)
Total | $ (40) | (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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