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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 1,263,481	$ 1,220,444
Gross Unrealized Gains	14,046	20,959
Gross Unrealized Losses	(6,697)	(9,972)
Securities available-for-sale, at fair value	1,270,830	1,231,431
SBA loan pool securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	16,812	17,436
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(79)	(82)
Securities available-for-sale, at fair value	16,733	17,354
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	122,300	99,591
Gross Unrealized Gains	1,419	6,793
Gross Unrealized Losses	(419)	0
Securities available-for-sale, at fair value	123,300	106,384
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	210,343	209,426
Gross Unrealized Gains	2,079	2,571
Gross Unrealized Losses	(1,466)	(166)
Securities available-for-sale, at fair value	210,956	211,831
Municipal securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	84,385	64,355
Gross Unrealized Gains	2,242	4,272
Gross Unrealized Losses	(1,089)	(4)
Securities available-for-sale, at fair value	85,538	68,623
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	154	156
Gross Unrealized Gains	4	4
Gross Unrealized Losses	0	0
Securities available-for-sale, at fair value	158	160
Collateralized loan obligations
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	687,505	687,505
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,632)	(9,720)
Securities available-for-sale, at fair value	683,873	677,785
Corporate debt securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	141,982	141,975
Gross Unrealized Gains	8,302	7,319
Gross Unrealized Losses	(12)	0
Securities available-for-sale, at fair value	$ 150,272	$ 149,294

X

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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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