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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 11,885 |
Due after one years through five years, amortized cost | 57,611 |
Due after five through ten years, amortized cost | 282,528 |
Due after ten years, amortized cost | 19,160 |
Total Debt Securities Fair Value | 711,629 |
Due in one year or less, fair value | 11,885 |
Due after one years through five years, fair value | 57,723 |
Due after five through ten years, fair value | 275,182 |
Due after ten years, fair value | 19,231 |
Amortized Cost | 690,118 | $ 557,891
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Agency-guaranteed residential mortgage-backed securities, amortized cost | 159,416 |
Agency-guaranteed residential mortgage-backed securities, fair value | 172,814 |
Amortized Cost | 159,416 | $ 273,252
Agency-guaranteed collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Agency-guaranteed residential mortgage-backed securities, amortized cost | 153,952 |
Agency-guaranteed residential mortgage-backed securities, fair value | 153,952 |
Amortized Cost | 153,952 |
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Agency-guaranteed residential mortgage-backed securities, amortized cost | 5,566 |
Agency-guaranteed residential mortgage-backed securities, fair value | 5,566 |
Amortized Cost | 5,566 |
Interest-only GNMA securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Agency-guaranteed residential mortgage-backed securities, amortized cost | 0 |
Agency-guaranteed residential mortgage-backed securities, fair value | $ 15,276 |

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