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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Due in one year | $ 57,685 |
Due after one year through five years | 125,533 |
Due after five years through ten years | 418,008 |
Due after ten years | 2,141,761 |
Amortized Cost | 2,742,987 | $ 2,208,330
Estimated Fair Value |  |
Due in one year | 56,111 |
Due after one year through five years | 120,116 |
Due after five years through ten years | 395,462 |
Due after ten years | 1,880,749 |
Totals | 2,452,438 | 2,207,938
Amortized Cost |  |
Due in one year | 0 |
Due after one year through five years | 3,730 |
Due after five years through ten years | 14,721 |
Due after ten years | 142,532 |
Amortized Cost | 160,983 | 199,759
Estimated Fair Value |  |
Due in one year | 0 |
Due after one year through five years | 3,616 |
Due after five years through ten years | 13,998 |
Due after ten years | 132,324 |
Totals | $ 149,938 | $ 208,140

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