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Investment Securities - Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 11,608 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 35,679 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 299,200 |
Due after ten years, Amortized Cost, Held-to-maturity | 2,189,492 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 2,535,979 |
Due in one year or less, Fair Value, Held-to-maturity | 11,147 |
Due after one year through five years, Fair Value, Held-to-maturity | 34,823 |
Due after five years through ten years, Fair Value, Held-to-maturity | 270,717 |
Due after ten years, Fair Value, Held-to-maturity | 1,851,882 |
Total, Held-to-maturity, Fair Value | 2,168,569 |
Due in one year or less, Amortized Cost, Available-for-sale | 1,495 |
Due after one year through five years, Amortized Cost, Available-for-sale | 327,651 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 1,945,392 |
Due after ten years, Amortized Cost, Available-for-sale | 1,389,646 |
Amortized Cost, Available-for-sale | 3,664,184 | $ 3,755,297
Due in one year or less, Fair Value, Available-for-sale | 1,500 |
Due after one year through five years, Fair Value, Available-for-sale | 314,059 |
Due after five years through ten years, Fair Value, Available-for-sale | 1,688,229 |
Due after ten years, Fair Value, Available-for-sale | 1,200,736 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 3,204,524 | $ 3,255,211

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