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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Less Than 12 Months	$ 465,641	$ 109,214
12 Months or Longer	436,801	470,240
Total	902,442	579,454
Gross Unrealized Losses
Less Than 12 Months	(6,103)	(301)
12 Months or Longer	(28,340)	(15,302)
Total	(34,443)	(15,603)
SBA loan pools securities
Fair Value
Less Than 12 Months	966
12 Months or Longer	0
Total	966
Gross Unrealized Losses
Less Than 12 Months	(15)
12 Months or Longer	0
Total	(15)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Fair Value
Less Than 12 Months	16,907	4,880
12 Months or Longer	436,740	470,092
Total	453,647	474,972
Gross Unrealized Losses
Less Than 12 Months	(374)	(35)
12 Months or Longer	(28,339)	(15,301)
Total	(28,713)	(15,336)
Non-agency residential mortgage-backed securities
Fair Value
Less Than 12 Months	95	0
12 Months or Longer	61	148
Total	156	148
Gross Unrealized Losses
Less Than 12 Months	(1)	0
12 Months or Longer	(1)	(1)
Total	(2)	(1)
Non-agency commercial mortgage-backed securities
Fair Value
Less Than 12 Months	152,392
12 Months or Longer	0
Total	152,392
Gross Unrealized Losses
Less Than 12 Months	(2,619)
12 Months or Longer	0
Total	(2,619)
Collateralized loan obligations
Fair Value
Less Than 12 Months	295,281	104,334
12 Months or Longer	0	0
Total	295,281	104,334
Gross Unrealized Losses
Less Than 12 Months	(3,094)	(266)
12 Months or Longer	0	0
Total	$ (3,094)	$ (266)

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