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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, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 20,556 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 44,550 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 318,541 |
Due after ten years, Amortized Cost, Held-to-maturity | 1,996,021 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,379,668 |
Due in one year or less, Fair Value, Held-to-maturity | 19,897 |
Due after one year through five years, Fair Value, Held-to-maturity | 43,049 |
Due after five years through ten years, Fair Value, Held-to-maturity | 277,213 |
Due after ten years, Fair Value, Held-to-maturity | 1,614,186 |
Total, Held-to-maturity, Fair Value | 1,954,345 |
Due in one year or less, Amortized Cost, Available-for-sale | 43,237 |
Due after one year through five years, Amortized Cost, Available-for-sale | 159,911 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 1,937,667 |
Due after ten years, Amortized Cost, Available-for-sale | 856,232 |
Amortized Cost, Available-for-sale | 2,997,047 | $ 3,398,942
Due in one year or less, Fair Value, Available-for-sale | 43,205 |
Due after one year through five years, Fair Value, Available-for-sale | 136,474 |
Due after five years through ten years, Fair Value, Available-for-sale | 1,629,085 |
Due after ten years, Fair Value, Available-for-sale | 733,351 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 2,542,115 | $ 2,956,125

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