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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Securities available-for-sale:
Amortized Cost	$ 929,449	$ 2,026,686
Gross Unrealized Gains	151	150
Gross Unrealized Losses	(17,020)	(34,336)
Fair Value	912,580	1,992,500
SBA loan pool securities
Securities available-for-sale:
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
Securities available-for-sale:
Amortized Cost	37,613	461,987
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,157)	(24,545)
Fair Value	36,456	437,442
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities available-for-sale:
Amortized Cost	91,543
Gross Unrealized Gains	16
Gross Unrealized Losses	(260)
Fair Value	91,299
Municipal securities
Securities available-for-sale:
Amortized Cost	52,997
Gross Unrealized Gains	51
Gross Unrealized Losses	(359)
Fair Value	52,689
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	191	418
Gross Unrealized Gains	5	9
Gross Unrealized Losses	0	0
Fair Value	196	427
Non-agency commercial mortgage-backed securities
Securities available-for-sale:
Amortized Cost		132,199
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		132,199
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	733,605	1,431,171
Gross Unrealized Gains	0	141
Gross Unrealized Losses	(15,244)	(9,790)
Fair Value	718,361	$ 1,421,522
Corporate debt securities
Securities available-for-sale:
Amortized Cost	13,500
Gross Unrealized Gains	79
Gross Unrealized Losses	0
Fair Value	$ 13,579

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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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