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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Less Than 12 Months	$ 940,694	$ 1,377,901
12 Months or Longer	426,115	457,632
Total	1,366,809	1,835,533
Gross Unrealized Losses
Less Than 12 Months	(17,101)	(9,613)
12 Months or Longer	(8,709)	(24,723)
Total	(25,810)	(34,336)
SBA loan pools securities
Fair Value
Less Than 12 Months	820	0
12 Months or Longer	0	910
Total	820	910
Gross Unrealized Losses
Less Than 12 Months	(11)	0
12 Months or Longer	0	(1)
Total	(11)	(1)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Fair Value
Less Than 12 Months	200,351	13,494
12 Months or Longer	230,807	423,916
Total	431,158	437,410
Gross Unrealized Losses
Less Than 12 Months	(6,653)	(133)
12 Months or Longer	(7,860)	(24,412)
Total	(14,513)	(24,545)
Non-agency residential mortgage-backed securities
Fair Value
Less Than 12 Months	15	90
12 Months or Longer	7	16
Total	22	106
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	0	0
Total	0	0
Collateralized loan obligations
Fair Value
Less Than 12 Months	739,508	1,364,317
12 Months or Longer	195,301	32,790
Total	934,809	1,397,107
Gross Unrealized Losses
Less Than 12 Months	(10,437)	(9,480)
12 Months or Longer	(849)	(310)
Total	$ (11,286)	$ (9,790)

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