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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities available-for-sale:
Amortized Cost	$ 1,220,444	$ 929,449
Gross Unrealized Gains	20,959	151
Gross Unrealized Losses	(9,972)	(17,020)
Securities available-for-sale, carried at fair value	1,231,431	912,580
SBA loan pools securities
Securities available-for-sale:
Amortized Cost	17,436
Gross Unrealized Gains	0
Gross Unrealized Losses	(82)
Securities available-for-sale, carried at fair value	17,354
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	99,591	37,613
Gross Unrealized Gains	6,793	0
Gross Unrealized Losses	0	(1,157)
Securities available-for-sale, carried at fair value	106,384	36,456
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities available-for-sale:
Amortized Cost	209,426	91,543
Gross Unrealized Gains	2,571	16
Gross Unrealized Losses	(166)	(260)
Securities available-for-sale, carried at fair value	211,831	91,299
Municipal securities
Securities available-for-sale:
Amortized Cost	64,355	52,997
Gross Unrealized Gains	4,272	51
Gross Unrealized Losses	(4)	(359)
Securities available-for-sale, carried at fair value	68,623	52,689
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	156	191
Gross Unrealized Gains	4	5
Gross Unrealized Losses	0	0
Securities available-for-sale, carried at fair value	160	196
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	687,505	733,605
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9,720)	(15,244)
Securities available-for-sale, carried at fair value	677,785	718,361
Corporate debt securities
Securities available-for-sale:
Amortized Cost	141,975	13,500
Gross Unrealized Gains	7,319	79
Gross Unrealized Losses	0	0
Securities available-for-sale, carried at fair value	$ 149,294	$ 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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