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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year | $ 51,718 |
Due after one year through five years | 49,150 |
Due after five years through ten years | 371,852 |
Due after ten years | 1,848,888 |
Amortized Cost | 2,321,608 | $ 2,384,325
Estimated Fair Value |  |
Due in one year | 51,226 |
Due after one year through five years | 46,062 |
Due after five years through ten years | 358,110 |
Due after ten years | 1,618,490 |
Totals | 2,073,888 | 2,152,504
Amortized Cost |  |
Due in one year | 0 |
Due after one year through five years | 5,396 |
Due after five years through ten years | 92,951 |
Due after ten years | 29,464 |
Totals | 127,811 | 133,494
Estimated Fair Value |  |
Due in one year | 0 |
Due after one year through five years | 5,206 |
Due after five years through ten years | 86,475 |
Due after ten years | 26,847 |
Totals | $ 118,528 | $ 125,126

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