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Investment Securities - Summary of Investment Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 4,962
Amortized cost, due after one year through five years	358,429
Amortized cost, due after five years through ten years	220,417
Amortized Cost	3,799,851	$ 1,174,188
Fair value, due in one year or less	5,008
Fair value, due after one year through five years	358,774
Fair value, due after five years through ten years	224,695
Fair Value	3,791,575	1,206,431
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	297,291
Amortized Cost	297,291	372,640
Debt securities without single maturity date, fair value	297,425
Fair Value	297,425	377,145
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	1,067,770
Amortized Cost	1,067,770	32,367
Debt securities without single maturity date, fair value	1,066,802
Fair Value	1,066,802	32,367
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	149,054
Amortized Cost	149,054
Debt securities without single maturity date, fair value	148,927
Fair Value	148,927
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	9,865
Amortized Cost	9,865	61,178
Debt securities without single maturity date, fair value	9,553
Fair Value	9,553	63,091
Agency-guaranteed commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	2,162
Debt securities without single maturity date, fair value	2,152
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	199,091
Amortized Cost	199,091	139,985
Debt securities without single maturity date, fair value	196,930
Fair Value	196,930	140,841
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	242,668
Amortized Cost	242,668	20,965
Debt securities without single maturity date, fair value	238,844
Fair Value	238,844	20,926
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	1,248,142
Amortized Cost	1,248,142	136,943
Debt securities without single maturity date, fair value	1,242,465
Fair Value	$ 1,242,465	$ 136,992

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