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Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Net Investment Income [Line Items] |  |
Due within one year, Estimated Fair Value | $ 489 |
Due after one but within five years, Amortized Cost | 17,900 |
Due after one but within five years, Estimated Fair Value | 18,139 |
Due after five but within ten years, Amortized Cost | 53,919 |
Due after five but within ten years, Estimated Fair Value | 50,767 |
Due after ten years, Amortized Cost | 0 |
Due after ten years, Estimated Fair Value | 0 |
Due within one year, Amortized Cost | 72,309 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 490 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 69,395 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 1,161,904 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 1,071,405 |
Amortized Cost | 1,234,213 | $ 1,138,425
Securities available for sale, at fair value | 1,140,800 | $ 1,020,986
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 1,234,213 |
Securities available for sale, at fair value | 1,140,800 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 727,200 |
Securities available for sale, at fair value | 688,000 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 434,700 |
Securities available for sale, at fair value | $ 383,500 |

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