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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 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	532,269
Due after five years through ten years, amortized cost	98,461
Amortized Cost	2,911,234	$ 3,138,534
Due in one year or less, fair value	7,444
Due after one year through five years, fair value	488,929
Due after five years through ten years, fair value	82,524
Fair Value	2,746,728	2,961,015
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	111,915
Amortized Cost	111,915	169,170
Debt securities, available-for-sale, without single maturity date, fair value	104,716
Fair Value	104,716	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	133,425
Amortized Cost	133,425	147,481
Debt securities, available-for-sale, without single maturity date, fair value	118,469
Fair Value	118,469	133,864
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	826,764
Amortized Cost	826,764	896,992
Debt securities, available-for-sale, without single maturity date, fair value	815,856
Fair Value	815,856	872,738
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	136,111
Amortized Cost	136,111	142,222
Debt securities, available-for-sale, without single maturity date, fair value	131,188
Fair Value	131,188	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	1,064,789
Amortized Cost	1,064,789	1,125,583
Debt securities, available-for-sale, without single maturity date, fair value	997,602
Fair Value	$ 997,602	$ 1,062,261

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