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v3.23.3

Investment Securities - Maturity of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Net Investment Income [Line Items] |  |
Due within one year, Amortized Cost | $ 6,253 |
Due within one year, Estimated Fair Value | 6,206 |
Due after one but within five years, Amortized Cost | 8,890 |
Due after one but within five years, Estimated Fair Value | 8,649 |
Due after five but within ten years, Amortized Cost | 28,837 |
Due after five but within ten years, Estimated Fair Value | 23,253 |
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 | 43,980 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value | 38,108 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 934,710 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 779,495 |
Amortized Cost | 978,690 | $ 898,702
Securities available for sale, at fair value | 817,603 | $ 762,661
Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 978,690 |
Securities available for sale, at fair value | 817,603 |
US Government Agencies Debt Securities [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 433,000 |
Securities available for sale, at fair value | 368,200 |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 501,700 |
Securities available for sale, at fair value | $ 411,300 |

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