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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 2,324,549	$ 2,567,393
Gross Unrealized Gains	7,018	23,679
Gross Unrealized Losses	(34,443)	(15,603)
Fair Value	2,297,124	2,575,469
SBA loan pools securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	982	1,056
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(15)	0
Fair Value	967	1,058
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	485,503	492,255
Gross Unrealized Gains	0	10
Gross Unrealized Losses	(28,713)	(15,336)
Fair Value	456,790	476,929
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	483	741
Gross Unrealized Gains	15	16
Gross Unrealized Losses	(2)	(1)
Fair Value	496	756
Non-agency commercial mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	160,970	305,172
Gross Unrealized Gains	7	5,339
Gross Unrealized Losses	(2,619)	0
Fair Value	158,358	310,511
Collateralized loan obligations
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	1,676,611	1,691,455
Gross Unrealized Gains	6,996	11,129
Gross Unrealized Losses	(3,094)	(266)
Fair Value	$ 1,680,513	1,702,318
Corporate debt securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		76,714
Gross Unrealized Gains		7,183
Gross Unrealized Losses		0
Fair Value		$ 83,897

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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Amount of 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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