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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, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 0 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 339,132 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 140,143 |
Due after ten years, Amortized Cost, Held-to-maturity | 195,177 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 674,452 |
Due in one year or less, Fair Value, Held-to-maturity | 0 |
Due after one year through five years, Fair Value, Held-to-maturity | 338,758 |
Due after five years through ten years, Fair Value, Held-to-maturity | 141,903 |
Due after ten years, Fair Value, Held-to-maturity | 198,287 |
Total, Held-to-maturity, Fair Value | 678,948 |
Due in one year or less, Amortized Cost, Available-for-sale | 16,048 |
Due after one year through five years, Amortized Cost, Available-for-sale | 1,414,580 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 266,108 |
Due after ten years, Amortized Cost, Available-for-sale | 21,621 |
Amortized Cost, Available-for-sale | 1,718,357 | $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale | 16,175 |
Due after one year through five years, Fair Value, Available-for-sale | 1,435,647 |
Due after five years through ten years, Fair Value, Available-for-sale | 266,349 |
Due after ten years, Fair Value, Available-for-sale | 22,086 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 1,740,257 | $ 1,734,085

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