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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,087,881	$ 2,524,663
Allowance for Credit Losses	(7,604)	(3,952)	$ (578)	$ 0
Gross Unrealized Gains	732	1,296
Gross Unrealized Losses	(95,571)	(145,147)
Fair Value	1,985,438	2,376,860
Equity securities	34,256	28,780
Investment securities, at fair value	2,019,694	2,405,640
Available-for-sale debt securities, accrued interest	$ 15,000	$ 14,700
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable	Accrued interest receivable
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 14,820	$ 97,359
Allowance for Credit Losses	(362)	(483)	(578)	0
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(1,222)	(4,262)
Fair Value	13,236	92,629
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	330,637
Allowance for Credit Losses	0
Gross Unrealized Gains	146
Gross Unrealized Losses	(3,745)
Fair Value	327,038
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	242,858	129,589
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(16,112)	(12,681)
Fair Value	226,746	116,908
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	95,850
Allowance for Credit Losses	0
Gross Unrealized Gains	44
Gross Unrealized Losses	(2,819)
Fair Value	93,075
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	257,500	500,109
Allowance for Credit Losses	0	0
Gross Unrealized Gains	100	1
Gross Unrealized Losses	(2,193)	(11,018)
Fair Value	255,407	489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	78,707	125,885
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(999)	(4,249)
Fair Value	77,708	121,636
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	564,524	636,880
Allowance for Credit Losses	(7,135)	(3,469)	$ 0	$ 0
Gross Unrealized Gains	347	79
Gross Unrealized Losses	(41,406)	(50,456)
Fair Value	516,330	583,034
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	502,985	1,034,841
Allowance for Credit Losses	(107)	0
Gross Unrealized Gains	95	1,201
Gross Unrealized Losses	(27,075)	(62,481)
Fair Value	$ 475,898	$ 973,561

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