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Investment Securities - Summary of Investment Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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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