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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,622,526		$ 2,524,663
Allowance for Credit Losses	(5,339)	$ (5,069)	(3,952)	$ (3,439)	$ (2,173)	$ (578)
Gross Unrealized Gains	1,717		1,296
Gross Unrealized Losses	(141,146)		(145,147)
Fair Value	2,477,758		2,376,860
Equity securities	33,892		28,780
Total investment securities, at fair value	2,511,650		2,405,640
Available-for-sale debt securities, accrued interest	18,500		14,700
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,517		97,359
Allowance for Credit Losses	(367)	(450)	(483)	(1,563)	(790)	(578)
Gross Unrealized Gains	0		15
Gross Unrealized Losses	(3,038)		(4,262)
Fair Value	47,112		92,629
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	198,732
Allowance for Credit Losses	0
Gross Unrealized Gains	943
Gross Unrealized Losses	(188)
Fair Value	199,487
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	181,750		129,589
Allowance for Credit Losses	0		0
Gross Unrealized Gains	19		0
Gross Unrealized Losses	(12,257)		(12,681)
Fair Value	169,512		116,908
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	83,180
Allowance for Credit Losses	0
Gross Unrealized Gains	133
Gross Unrealized Losses	(1,495)
Fair Value	81,818
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	412,452		500,109
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		1
Gross Unrealized Losses	(6,419)		(11,018)
Fair Value	406,033		489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	100,610		125,885
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1,588)		(4,249)
Fair Value	99,022		121,636
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	655,759		636,880
Allowance for Credit Losses	(4,972)	$ (4,619)	(3,469)	$ (1,876)	$ (1,383)	$ 0
Gross Unrealized Gains	131		79
Gross Unrealized Losses	(63,173)		(50,456)
Fair Value	587,745		583,034
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	939,526		1,034,841
Allowance for Credit Losses	0		0
Gross Unrealized Gains	491		1,201
Gross Unrealized Losses	(52,988)		(62,481)
Fair Value	$ 887,029		$ 973,561

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