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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)