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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 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 | $ 10,613 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 48,043 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 323,158 |
Due after ten years, Amortized Cost, Held-to-maturity | 2,048,072 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,429,886 |
Due in one year or less, Fair Value, Held-to-maturity | 10,341 |
Due after one year through five years, Fair Value, Held-to-maturity | 45,765 |
Due after five years through ten years, Fair Value, Held-to-maturity | 280,962 |
Due after ten years, Fair Value, Held-to-maturity | 1,669,022 |
Total, Held-to-maturity, Fair Value | 2,006,090 |
Due in one year or less, Amortized Cost, Available-for-sale | 43,972 |
Due after one year through five years, Amortized Cost, Available-for-sale | 240,902 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 2,470,052 |
Due after ten years, Amortized Cost, Available-for-sale | 492,502 |
Amortized Cost, Available-for-sale | 3,247,428 | $ 3,398,942
Due in one year or less, Fair Value, Available-for-sale | 43,677 |
Due after one year through five years, Fair Value, Available-for-sale | 216,478 |
Due after five years through ten years, Fair Value, Available-for-sale | 2,114,826 |
Due after ten years, Fair Value, Available-for-sale | 370,815 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 2,745,796 | $ 2,956,125

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