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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)