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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, 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 | $ 500 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 315,591 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 187,726 |
Due after ten years, Amortized Cost, Held-to-maturity | 224,296 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 728,113 |
Due in one year or less, Fair Value, Held-to-maturity | 503 |
Due after one year through five years, Fair Value, Held-to-maturity | 311,769 |
Due after five years through ten years, Fair Value, Held-to-maturity | 189,711 |
Due after ten years, Fair Value, Held-to-maturity | 227,049 |
Total, Held-to-maturity, Fair Value | 729,032 |
Due in one year or less, Amortized Cost, Available-for-sale | 14,715 |
Due after one year through five years, Amortized Cost, Available-for-sale | 1,427,215 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 114,977 |
Due after ten years, Amortized Cost, Available-for-sale | 27,780 |
Amortized Cost, Available-for-sale | 1,584,687 | $ 1,757,666
Due in one year or less, Fair Value, Available-for-sale | 14,896 |
Due after one year through five years, Fair Value, Available-for-sale | 1,441,490 |
Due after five years through ten years, Fair Value, Available-for-sale | 115,535 |
Due after ten years, Fair Value, Available-for-sale | 28,099 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 1,600,020 | $ 1,734,085

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