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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 8,000 |
Due after one years through five years, amortized cost | 83,209 |
Due after five through ten years, amortized cost | 274,135 |
Due after ten years, amortized cost | 36,391 |
Amortized Cost | 1,106,966 | $ 557,891
Due in one year or less, fair value | 8,000 |
Due after one years through five years, fair value | 84,275 |
Due after five through ten years, fair value | 292,605 |
Due after ten years, fair value | 37,259 |
Total Debt Securities Fair Value | 1,131,365 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 374,151 |
Amortized Cost | 374,151 |
Debt securities, available-for-sale, without single maturity date, fair value | 375,381 |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 59,013 |
Amortized Cost | 59,013 | $ 273,252
Debt securities, available-for-sale, without single maturity date, fair value | 61,079 |
Agency-guaranteed collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 153,088 |
Amortized Cost | 153,088 |
Debt securities, available-for-sale, without single maturity date, fair value | 153,779 |
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 118,979 |
Amortized Cost | 118,979 |
Debt securities, available-for-sale, without single maturity date, fair value | $ 118,987 |

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