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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 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 | $ 2,842 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 645,420 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 694,667 |
Due after ten years, Amortized Cost, Held-to-maturity | 1,214,993 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,557,922 |
Due in one year or less, Fair Value, Held-to-maturity | 2,823 |
Due after one year through five years, Fair Value, Held-to-maturity | 568,453 |
Due after five years through ten years, Fair Value, Held-to-maturity | 595,729 |
Due after ten years, Fair Value, Held-to-maturity | 983,983 |
Total, Held-to-maturity, Fair Value | 2,150,988 |
Due in one year or less, Amortized Cost, Available-for-sale | 19,914 |
Due after one year through five years, Amortized Cost, Available-for-sale | 892,491 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 2,610,587 |
Due after ten years, Amortized Cost, Available-for-sale | 339,224 |
Amortized Cost, Available-for-sale | 3,862,216 | $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale | 19,404 |
Due after one year through five years, Fair Value, Available-for-sale | 809,644 |
Due after five years through ten years, Fair Value, Available-for-sale | 2,213,671 |
Due after ten years, Fair Value, Available-for-sale | 279,105 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 3,321,824 | $ 3,183,923

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