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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 109,214 | $ 1,110,832
12 Months or Longer | 470,240 | 4,520
Total | 579,454 | 1,115,352
Gross Unrealized Losses |  |
Less Than 12 Months | (301) | (28,322)
12 Months or Longer | (15,302) | (116)
Total | (15,603) | (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 | 4,880 | 805,803
12 Months or Longer | 470,092 | 760
Total | 474,972 | 806,563
Gross Unrealized Losses |  |
Less Than 12 Months | (35) | (23,410)
12 Months or Longer | (15,301) | (8)
Total | (15,336) | (23,418)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 116,216
12 Months or Longer | 148 | 230
Total | 148 | 116,446
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (4,238)
12 Months or Longer | (1) | 0
Total | (1) | (4,238)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 104,334 | 187,592
12 Months or Longer | 0 | 0
Total | 104,334 | 187,592
Gross Unrealized Losses |  |
Less Than 12 Months | (266) | (674)
12 Months or Longer | 0 | 0
Total | $ (266) | (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)
Non-agency commercial mortgage-backed securities |  |
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)
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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