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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 31,500
Due after one year through five years, amortized cost	569,353
Due after five years through ten years, amortized cost	67,606
Amortized Cost	2,715,374	$ 2,524,663
Due in one year or less, fair value	26,852
Due after one year through five years, fair value	525,291
Due after five years through ten years, fair value	58,327
Fair Value	2,571,139	2,376,860
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	62,274
Amortized Cost	62,274	97,359
Debt securities, available-for-sale, without single maturity date, fair value	58,234
Fair Value	58,234	92,629
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	86,227
Amortized Cost	86,227
Debt securities, available-for-sale, without single maturity date, fair value	86,412
Fair Value	86,412
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	138,573
Amortized Cost	138,573	129,589
Debt securities, available-for-sale, without single maturity date, fair value	124,958
Fair Value	124,958	116,908
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	34,573
Amortized Cost	34,573
Debt securities, available-for-sale, without single maturity date, fair value	33,774
Fair Value	33,774
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	593,236
Amortized Cost	593,236	500,109
Debt securities, available-for-sale, without single maturity date, fair value	584,495
Fair Value	584,495	489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	114,445
Amortized Cost	114,445	125,885
Debt securities, available-for-sale, without single maturity date, fair value	112,626
Fair Value	112,626	121,636
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	1,017,587
Amortized Cost	1,017,587	1,034,841
Debt securities, available-for-sale, without single maturity date, fair value	960,170
Fair Value	$ 960,170	$ 973,561

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