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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities available-for-sale:
Amortized Cost	$ 1,304,723	$ 1,220,444
Gross Unrealized Gains	18,324	20,959
Gross Unrealized Losses	(7,344)	(9,972)
Securities available-for-sale, carried at fair value	1,315,703	1,231,431
SBA loan pools securities
Securities available-for-sale:
Amortized Cost	14,679	17,436
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(88)	(82)
Securities available-for-sale, carried at fair value	14,591	17,354
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	190,382	99,591
Gross Unrealized Gains	2,898	6,793
Gross Unrealized Losses	(1,311)	0
Securities available-for-sale, carried at fair value	191,969	106,384
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities available-for-sale:
Amortized Cost	242,458	209,426
Gross Unrealized Gains	1,171	2,571
Gross Unrealized Losses	(2,088)	(166)
Securities available-for-sale, carried at fair value	241,541	211,831
Municipal securities
Securities available-for-sale:
Amortized Cost	117,913	64,355
Gross Unrealized Gains	2,641	4,272
Gross Unrealized Losses	(1,539)	(4)
Securities available-for-sale, carried at fair value	119,015	68,623
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	56,014	156
Gross Unrealized Gains	11	4
Gross Unrealized Losses	0	0
Securities available-for-sale, carried at fair value	56,025	160
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	521,275	687,505
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,311)	(9,720)
Securities available-for-sale, carried at fair value	518,964	677,785
Corporate debt securities
Securities available-for-sale:
Amortized Cost	162,002	141,975
Gross Unrealized Gains	11,603	7,319
Gross Unrealized Losses	(7)	0
Securities available-for-sale, carried at fair value	$ 173,598	$ 149,294

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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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