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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities available-for-sale:
Amortized Cost	$ 2,026,686	$ 2,567,393
Gross Unrealized Gains	150	23,679
Gross Unrealized Losses	(34,336)	(15,603)
Fair Value	1,992,500	2,575,469
SBA loan pool securities
Securities available-for-sale:
Amortized Cost	911	1,056
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(1)	0
Fair Value	910	1,058
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	461,987	492,255
Gross Unrealized Gains	0	10
Gross Unrealized Losses	(24,545)	(15,336)
Fair Value	437,442	476,929
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	418	741
Gross Unrealized Gains	9	16
Gross Unrealized Losses	0	(1)
Fair Value	427	756
Non-agency commercial mortgage-backed securities
Securities available-for-sale:
Amortized Cost	132,199	305,172
Gross Unrealized Gains	0	5,339
Gross Unrealized Losses	0	0
Fair Value	132,199	310,511
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	1,431,171	1,691,455
Gross Unrealized Gains	141	11,129
Gross Unrealized Losses	(9,790)	(266)
Fair Value	$ 1,421,522	1,702,318
Corporate debt securities
Securities available-for-sale:
Amortized Cost		76,714
Gross Unrealized Gains		7,183
Gross Unrealized Losses		0
Fair Value		$ 83,897

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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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