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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 4,901 |
Due after one years through five years, amortized cost | 211,508 |
Due after five through ten years, amortized cost | 154,043 |
Due after ten years, amortized cost | 4,000 |
Amortized Cost | 1,520,523 | $ 1,174,188
Due in one year or less, fair value | 5,032 |
Due after one years through five years, fair value | 212,586 |
Due after five through ten years, fair value | 157,219 |
Due after ten years, fair value | 4,252 |
Total Debt Securities Fair Value | 1,526,792 | 1,206,431
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 319,682 |
Amortized Cost | 319,682 | 372,640
Debt securities, available-for-sale, without single maturity date, fair value | 322,954 |
Total Debt Securities Fair Value | 322,954 | 377,145
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 162,960 |
Amortized Cost | 162,960 | 32,367
Debt securities, available-for-sale, without single maturity date, fair value | 162,927 |
Total Debt Securities Fair Value | 162,927 | 32,367
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 23,054 |
Amortized Cost | 23,054 |
Debt securities, available-for-sale, without single maturity date, fair value | 23,087 |
Total Debt Securities Fair Value | 23,087 |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 10,620 |
Amortized Cost | 10,620 | 61,178
Debt securities, available-for-sale, without single maturity date, fair value | 10,355 |
Total Debt Securities Fair Value | 10,355 | 63,091
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 2,206 |
Amortized Cost | 2,206 |
Debt securities, available-for-sale, without single maturity date, fair value | 2,205 |
Total Debt Securities Fair Value | 2,205 |
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 81,007 |
Amortized Cost | 81,007 | 139,985
Debt securities, available-for-sale, without single maturity date, fair value | 81,758 |
Total Debt Securities Fair Value | 81,758 | 140,841
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 144,593 |
Amortized Cost | 144,593 | 20,965
Debt securities, available-for-sale, without single maturity date, fair value | 142,841 |
Total Debt Securities Fair Value | 142,841 | 20,926
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 401,949 |
Amortized Cost | 401,949 | 136,943
Debt securities, available-for-sale, without single maturity date, fair value | 401,576 |
Total Debt Securities Fair Value | $ 401,576 | $ 136,992

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