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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value
Less Than 12 Months	$ 484,079	$ 109,214
12 Months or Longer	424,461	470,240
Total	908,540	579,454
Gross Unrealized Losses
Less Than 12 Months	(5,181)	(301)
12 Months or Longer	(32,737)	(15,302)
Total	(37,918)	(15,603)
SBA loan pools securities
Fair Value
Less Than 12 Months	888
12 Months or Longer	0
Total	888
Gross Unrealized Losses
Less Than 12 Months	(22)
12 Months or Longer	0
Total	(22)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Fair Value
Less Than 12 Months	14,964	4,880
12 Months or Longer	424,417	470,092
Total	439,381	474,972
Gross Unrealized Losses
Less Than 12 Months	(376)	(35)
12 Months or Longer	(32,737)	(15,301)
Total	(33,113)	(15,336)
Non-agency residential mortgage-backed securities
Fair Value
Less Than 12 Months	78	0
12 Months or Longer	44	148
Total	122	148
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	0	(1)
Total	0	(1)
Non-agency commercial mortgage-backed securities
Fair Value
Less Than 12 Months	132,703
12 Months or Longer	0
Total	132,703
Gross Unrealized Losses
Less Than 12 Months	(2,854)
12 Months or Longer	0
Total	(2,854)
Collateralized loan obligations
Fair Value
Less Than 12 Months	335,446	104,334
12 Months or Longer	0	0
Total	335,446	104,334
Gross Unrealized Losses
Less Than 12 Months	(1,929)	(266)
12 Months or Longer	0	0
Total	$ (1,929)	$ (266)

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