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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value    
Less Than 12 Months $ 479,083 $ 878,890
12 Months or Longer 5,300 0
Total 484,383 878,890
Gross Unrealized Losses    
Less Than 12 Months (7,456) (30,214)
12 Months or Longer (82) 0
Total (7,538) (30,214)
Fair Value    
Less Than 12 Months 364,930 698,170
12 Months or Longer 2,724 7,235
Total 367,654 705,405
Gross Unrealized Losses    
Less Than 12 Months (1,453) (5,246)
12 Months or Longer (23) (124)
Total (1,476) (5,370)
Private label residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 125 0
12 Months or Longer 317 403
Total 442 403
Gross Unrealized Losses    
Less Than 12 Months 0 0
12 Months or Longer (3) (1)
Total (3) (1)
Corporate bonds    
Fair Value    
Less Than 12 Months 49,682 190,332
12 Months or Longer 5,300 0
Total 54,982 190,332
Gross Unrealized Losses    
Less Than 12 Months (490) (20,946)
12 Months or Longer (82) 0
Total (572) (20,946)
Fair Value    
Less Than 12 Months 13,828 26,152
12 Months or Longer 0 0
Total 13,828 26,152
Gross Unrealized Losses    
Less Than 12 Months (339) (505)
12 Months or Longer 0 0
Total (339) (505)
Collateralized loan obligations    
Fair Value    
Less Than 12 Months 409,630 411,207
12 Months or Longer 0 0
Total 409,630 411,207
Gross Unrealized Losses    
Less Than 12 Months (6,692) (5,077)
12 Months or Longer 0 0
Total (6,692) (5,077)
Fair Value    
Less Than 12 Months 229,478 72,204
12 Months or Longer 0 0
Total 229,478 72,204
Gross Unrealized Losses    
Less Than 12 Months (939) (282)
12 Months or Longer 0 0
Total (939) (282)
Commercial mortgage-backed securities    
Fair Value    
Less Than 12 Months 19,771 277,351
12 Months or Longer 0 0
Total 19,771 277,351
Gross Unrealized Losses    
Less Than 12 Months (274) (4,191)
12 Months or Longer 0 0
Total (274) (4,191)
Agency mortgage-backed securities    
Fair Value    
Less Than 12 Months 121,499 599,814
12 Months or Longer 2,407 6,832
Total 123,906 606,646
Gross Unrealized Losses    
Less Than 12 Months (175) (4,459)
12 Months or Longer (20) (123)
Total $ (195) $ (4,582)