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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 0
Due after one year through five years, amortized cost	463,431
Due after five years through ten years, amortized cost	133,079
Amortized Cost	3,084,960	$ 3,799,851
Due in one year or less, fair value	0
Due after one year through five years, fair value	421,935
Due after five years through ten years, fair value	118,071
Fair Value	2,918,830	3,791,575
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	200,171
Amortized Cost	200,171	297,291
Debt securities, available-for-sale, without single maturity date, fair value	193,261
Fair Value	193,261	297,425
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	855,959
Amortized Cost	855,959	1,067,770
Debt securities, available-for-sale, without single maturity date, fair value	827,813
Fair Value	827,813	1,066,802
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	138,972
Amortized Cost	138,972	149,054
Debt securities, available-for-sale, without single maturity date, fair value	134,843
Fair Value	134,843	148,927
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	152,008
Amortized Cost	152,008	199,091
Debt securities, available-for-sale, without single maturity date, fair value	138,222
Fair Value	138,222	196,930
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	1,141,340
Amortized Cost	1,141,340	1,248,142
Debt securities, available-for-sale, without single maturity date, fair value	1,084,685
Fair Value	$ 1,084,685	$ 1,242,465

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