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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 789,246	$ 2,026,686
Gross Unrealized Gains	10	150
Gross Unrealized Losses	(13,594)	(34,336)
Fair Value	775,662	1,992,500
SBA loan pools securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		911
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Value		910
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	40,374	461,987
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(24,545)
Fair Value	40,374	437,442
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	267	418
Gross Unrealized Gains	10	9
Gross Unrealized Losses	0	0
Fair Value	277	427
Non-agency commercial mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		132,199
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		132,199
Collateralized loan obligations
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	748,605	1,431,171
Gross Unrealized Gains	0	141
Gross Unrealized Losses	(13,594)	(9,790)
Fair Value	$ 735,011	$ 1,421,522

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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