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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Net Investment Income [Line Items] |  |
Due within one year, Amortized Cost | $ 5,000 |
Due within one year, Estimated Fair Value | 5,027 |
Due after one but within five years, Amortized Cost | 13,872 |
Due after one but within five years, Estimated Fair Value | 14,498 |
Due after five but within ten years, Amortized Cost | 19,821 |
Due after five but within ten years, Estimated Fair Value | 20,316 |
Due after ten years, Amortized Cost | 0 |
Due after ten years, Estimated Fair Value | 0 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 38,693 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 39,841 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 1,078,691 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 1,085,115 |
Amortized Cost | 1,117,384 | $ 805,515
Securities available for sale, at fair value | 1,124,956 | $ 831,223
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 1,117,384 |
Securities available for sale, at fair value | 1,124,956 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 396,000 |
Securities available for sale, at fair value | 399,700 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 682,700 |
Securities available for sale, at fair value | $ 685,400 |

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