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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,496,951	$ 2,026,686
Gross Unrealized Gains	162	150
Gross Unrealized Losses	(25,810)	(34,336)
Fair Value	1,471,303	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	0	0
Gross Unrealized Losses	(11)	(1)
Fair Value	820	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	448,956	461,987
Gross Unrealized Gains	18	0
Gross Unrealized Losses	(14,513)	(24,545)
Fair Value	434,461	437,442
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	319	418
Gross Unrealized Gains	12	9
Gross Unrealized Losses	0	0
Fair Value	331	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	1,046,845	1,431,171
Gross Unrealized Gains	132	141
Gross Unrealized Losses	(11,286)	(9,790)
Fair Value	$ 1,035,691	$ 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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