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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 4,992 |
Due after one years through five years, amortized cost | 419,539 |
Due after five through ten years, amortized cost | 191,230 |
Amortized Cost | 4,232,729 | $ 3,799,851
Due in one year or less, fair value | 4,999 |
Due after one years through five years, fair value | 409,141 |
Due after five through ten years, fair value | 187,560 |
Total Debt Securities Fair Value | 4,144,029 | 3,791,575
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 351,847 |
Amortized Cost | 351,847 | 297,291
Debt securities, available-for-sale, without single maturity date, fair value | 343,619 |
Total Debt Securities Fair Value | 343,619 | 297,425
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 1,010,938 |
Amortized Cost | 1,010,938 | 1,067,770
Debt securities, available-for-sale, without single maturity date, fair value | 1,004,362 |
Total Debt Securities Fair Value | 1,004,362 | 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 | 148,993 |
Amortized Cost | 148,993 | 149,054
Debt securities, available-for-sale, without single maturity date, fair value | 147,625 |
Total Debt Securities Fair Value | 147,625 | 148,927
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 9,242 |
Amortized Cost | 9,242 | 9,865
Debt securities, available-for-sale, without single maturity date, fair value | 8,269 |
Total Debt Securities Fair Value | 8,269 | 9,553
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 2,140 |
Amortized Cost | 2,140 | 2,162
Debt securities, available-for-sale, without single maturity date, fair value | 2,045 |
Total Debt Securities Fair Value | 2,045 | 2,152
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 618,998 |
Amortized Cost | 618,998 | 199,091
Debt securities, available-for-sale, without single maturity date, fair value | 603,403 |
Total Debt Securities Fair Value | 603,403 | 196,930
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 172,410 |
Amortized Cost | 172,410 | 242,668
Debt securities, available-for-sale, without single maturity date, fair value | 162,599 |
Total Debt Securities Fair Value | 162,599 | 238,844
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 1,302,400 |
Amortized Cost | 1,302,400 | 1,248,142
Debt securities, available-for-sale, without single maturity date, fair value | 1,270,407 |
Total Debt Securities Fair Value | $ 1,270,407 | $ 1,242,465

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