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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,715,374	$ 2,524,663
Allowance for Credit Losses	(5,069)	(3,952)	$ (2,173)	$ (578)
Gross Unrealized Gains	1,055	1,296
Gross Unrealized Losses	(140,221)	(145,147)
Fair Value	2,571,139	2,376,860
Equity securities	33,729	28,780
Total investment securities, at fair value	2,604,868	2,405,640
Available-for-sale debt securities, accrued interest	19,500	14,700
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,274	97,359
Allowance for Credit Losses	(450)	(483)	(790)	(578)
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(3,590)	(4,262)
Fair Value	58,234	92,629
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,227
Allowance for Credit Losses	0
Gross Unrealized Gains	299
Gross Unrealized Losses	(114)
Fair Value	86,412
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138,573	129,589
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(13,615)	(12,681)
Fair Value	124,958	116,908
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,573
Allowance for Credit Losses	0
Gross Unrealized Gains	73
Gross Unrealized Losses	(872)
Fair Value	33,774
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	593,236	500,109
Allowance for Credit Losses	0	0
Gross Unrealized Gains	55	1
Gross Unrealized Losses	(8,796)	(11,018)
Fair Value	584,495	489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,445	125,885
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,819)	(4,249)
Fair Value	112,626	121,636
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	668,459	636,880
Allowance for Credit Losses	(4,619)	(3,469)	$ (1,383)	$ 0
Gross Unrealized Gains	0	79
Gross Unrealized Losses	(53,370)	(50,456)
Fair Value	610,470	583,034
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,017,587	1,034,841
Allowance for Credit Losses	0	0
Gross Unrealized Gains	628	1,201
Gross Unrealized Losses	(58,045)	(62,481)
Fair Value	$ 960,170	$ 973,561

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