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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year | $ 83,239 |
Due after one year through five years | 47,769 |
Due after five years through ten years | 367,733 |
Due after ten years | 1,885,584 |
Amortized Cost | 2,384,325 | $ 2,742,987
Estimated Fair Value |  |
Due in one year | 81,775 |
Due after one year through five years | 44,932 |
Due after five years through ten years | 354,333 |
Due after ten years | 1,671,464 |
Totals | 2,152,504 | 2,452,438
Amortized Cost |  |
Due in one year | 0 |
Due after one year through five years | 5,829 |
Due after five years through ten years | 89,070 |
Due after ten years | 38,595 |
Amortized Cost | 133,494 | 160,983
Estimated Fair Value |  |
Due in one year | 0 |
Due after one year through five years | 5,640 |
Due after five years through ten years | 83,726 |
Due after ten years | 35,760 |
Totals | $ 125,126 | $ 149,938

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