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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, 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 | $ 4,875 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 606,745 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 737,884 |
Due after ten years, Amortized Cost, Held-to-maturity | 1,062,804 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,412,308 |
Due in one year or less, Fair Value, Held-to-maturity | 4,882 |
Due after one year through five years, Fair Value, Held-to-maturity | 556,072 |
Due after five years through ten years, Fair Value, Held-to-maturity | 659,288 |
Due after ten years, Fair Value, Held-to-maturity | 913,941 |
Total, Held-to-maturity, Fair Value | 2,134,183 |
Due in one year or less, Amortized Cost, Available-for-sale | 26,014 |
Due after one year through five years, Amortized Cost, Available-for-sale | 1,059,708 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 2,654,991 |
Due after ten years, Amortized Cost, Available-for-sale | 231,724 |
Amortized Cost, Available-for-sale | 3,972,437 | $ 3,185,249
Due in one year or less, Fair Value, Available-for-sale | 25,660 |
Due after one year through five years, Fair Value, Available-for-sale | 995,539 |
Due after five years through ten years, Fair Value, Available-for-sale | 2,403,349 |
Due after ten years, Fair Value, Available-for-sale | 201,609 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 3,626,157 | $ 3,183,923

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