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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 7,500
Due after one year through five years, amortized cost	521,866
Due after five years through ten years, amortized cost	113,391
Amortized Cost	2,985,529	$ 3,138,534
Due in one year or less, fair value	7,425
Due after one year through five years, fair value	479,208
Due after five years through ten years, fair value	93,118
Fair Value	2,797,940	2,961,015
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	135,188
Amortized Cost	135,188	169,170
Debt securities, available-for-sale, without single maturity date, fair value	126,537
Fair Value	126,537	160,542
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	138,869
Amortized Cost	138,869	147,481
Debt securities, available-for-sale, without single maturity date, fair value	125,308
Fair Value	125,308	133,864
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	848,861
Amortized Cost	848,861	896,992
Debt securities, available-for-sale, without single maturity date, fair value	831,253
Fair Value	831,253	872,738
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	136,941
Amortized Cost	136,941	142,222
Debt securities, available-for-sale, without single maturity date, fair value	132,474
Fair Value	132,474	136,357
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	1,082,913
Amortized Cost	1,082,913	1,125,583
Debt securities, available-for-sale, without single maturity date, fair value	1,002,617
Fair Value	$ 1,002,617	$ 1,062,261

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