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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Net Investment Income [Line Items] |  |
Due within one year, Amortized Cost | $ 4,999 |
Due within one year, Estimated Fair Value | 4,985 |
Due after one but within five years, Amortized Cost | 8,880 |
Due after one but within five years, Estimated Fair Value | 8,611 |
Due after five but within ten years, Amortized Cost | 28,645 |
Due after five but within ten years, Estimated Fair Value | 24,764 |
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 | 42,524 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 38,360 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 884,351 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 749,055 |
Amortized Cost | 926,875 | $ 1,045,579
Securities available for sale, at fair value | 787,415 | $ 1,041,380
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 926,875 |
Securities available for sale, at fair value | 787,415 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 339,200 |
Securities available for sale, at fair value | 287,500 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 545,200 |
Securities available for sale, at fair value | $ 461,500 |

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