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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,185,657	$ 2,026,686
Gross Unrealized Gains	228	150
Gross Unrealized Losses	(18,198)	(34,336)
Fair Value	1,167,687	1,992,500
SBA loan pools securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	831	911
Gross Unrealized Gains	22	0
Gross Unrealized Losses	0	(1)
Fair Value	853	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	436,049	461,987
Gross Unrealized Gains	196	0
Gross Unrealized Losses	(6,898)	(24,545)
Fair Value	429,347	437,442
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	275	418
Gross Unrealized Gains	10	9
Gross Unrealized Losses	0	0
Fair Value	285	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	748,502	1,431,171
Gross Unrealized Gains	0	141
Gross Unrealized Losses	(11,300)	(9,790)
Fair Value	$ 737,202	$ 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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Amount, before tax, of unrealized loss 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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