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INVESTMENT SECURITIES - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,928,092	$ 1,928,092		$ 2,087,881
Allowance for Credit Losses	(17,356)	(17,356)	$ (13,127)	(7,604)	$ (5,339)	$ (5,069)	$ (3,952)
Gross Unrealized Gains	3,100	3,100		732
Gross Unrealized Losses	(67,270)	(67,270)		(95,571)
Fair Value	1,846,566	1,846,566		1,985,438
Equity securities	30,840	30,840		34,256
Total investment securities, at fair value	1,877,406	1,877,406		2,019,694
Available-for-sale debt securities, accrued interest	11,500	11,500		15,000
Impairment loss on securities without a readily determinable fair value	2,300	2,300
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	230,077	230,077		14,820
Allowance for Credit Losses	(584)	(584)	(353)	(362)	(367)	(450)	(483)
Gross Unrealized Gains	0	0		0
Gross Unrealized Losses	(795)	(795)		(1,222)
Fair Value	228,698	228,698		13,236
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	457,217	457,217		330,637
Allowance for Credit Losses	0	0		0
Gross Unrealized Gains	831	831		146
Gross Unrealized Losses	(3,417)	(3,417)		(3,745)
Fair Value	454,631	454,631		327,038
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	337,857	337,857		242,858
Allowance for Credit Losses	0	0		0
Gross Unrealized Gains	869	869		0
Gross Unrealized Losses	(11,388)	(11,388)		(16,112)
Fair Value	327,338	327,338		226,746
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97,755	97,755		95,850
Allowance for Credit Losses	0	0		0
Gross Unrealized Gains	321	321		44
Gross Unrealized Losses	(3,345)	(3,345)		(2,819)
Fair Value	94,731	94,731		93,075
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,800	10,800		257,500
Allowance for Credit Losses	0	0		0
Gross Unrealized Gains	0	0		100
Gross Unrealized Losses	(248)	(248)		(2,193)
Fair Value	10,552	10,552		255,407
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost				78,707
Allowance for Credit Losses				0
Gross Unrealized Gains				0
Gross Unrealized Losses				(999)
Fair Value				77,708
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	402,854	402,854		564,524
Allowance for Credit Losses	(16,772)	(16,772)	$ (12,774)	(7,135)	$ (4,972)	$ (4,619)	$ (3,469)
Gross Unrealized Gains	1,079	1,079		347
Gross Unrealized Losses	(20,951)	(20,951)		(41,406)
Fair Value	366,210	366,210		516,330
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	391,532	391,532		502,985
Allowance for Credit Losses	0	0		(107)
Gross Unrealized Gains	0	0		95
Gross Unrealized Losses	(27,126)	(27,126)		(27,075)
Fair Value	$ 364,406	$ 364,406		$ 475,898

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