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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, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 2,000 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 41,895 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 263,552 |
Due after ten years, Amortized Cost, Held-to-maturity | 2,246,854 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,554,301 |
Due in one year or less, Fair Value, Held-to-maturity | 1,995 |
Due after one year through five years, Fair Value, Held-to-maturity | 40,245 |
Due after five years through ten years, Fair Value, Held-to-maturity | 234,866 |
Due after ten years, Fair Value, Held-to-maturity | 1,878,481 |
Total, Held-to-maturity, Fair Value | 2,155,587 |
Due in one year or less, Amortized Cost, Available-for-sale | 1,578 |
Due after one year through five years, Amortized Cost, Available-for-sale | 345,663 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 1,643,898 |
Due after ten years, Amortized Cost, Available-for-sale | 1,764,158 |
Amortized Cost, Available-for-sale | 3,755,297 | $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale | 1,583 |
Due after one year through five years, Fair Value, Available-for-sale | 330,565 |
Due after five years through ten years, Fair Value, Available-for-sale | 1,420,508 |
Due after ten years, Fair Value, Available-for-sale | 1,502,555 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 3,255,211 | $ 3,183,923

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