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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 12,935 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 36,466 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 321,288 |
Due after ten years, Amortized Cost, Held-to-maturity | 2,093,921 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,464,610 |
Due in one year or less, Fair Value, Held-to-maturity | 12,577 |
Due after one year through five years, Fair Value, Held-to-maturity | 35,528 |
Due after five years through ten years, Fair Value, Held-to-maturity | 287,284 |
Due after ten years, Fair Value, Held-to-maturity | 1,747,492 |
Total, Held-to-maturity, Fair Value | 2,082,881 |
Due in one year or less, Amortized Cost, Available-for-sale | 34,448 |
Due after one year through five years, Amortized Cost, Available-for-sale | 268,224 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 2,528,106 |
Due after ten years, Amortized Cost, Available-for-sale | 568,164 |
Amortized Cost, Available-for-sale | 3,398,942 | $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale | 34,448 |
Due after one year through five years, Fair Value, Available-for-sale | 264,349 |
Due after five years through ten years, Fair Value, Available-for-sale | 2,205,784 |
Due after ten years, Fair Value, Available-for-sale | 451,544 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 2,956,125 | $ 3,255,211

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