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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, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost, Held-to-maturity | $ 2,075 |
Due after one year through five years, Amortized Cost, Held-to-maturity | 341,272 |
Due after five years through ten years, Amortized Cost, Held-to-maturity | 96,738 |
Due after ten years, Amortized Cost, Held-to-maturity | 173,084 |
Total Held-to-maturity, Debt Maturities, Amortized Cost Basis | 613,169 |
Due in one year or less, Fair Value, Held-to-maturity | 2,113 |
Due after one year through five years, Fair Value, Held-to-maturity | 354,456 |
Due after five years through ten years, Fair Value, Held-to-maturity | 100,064 |
Due after ten years, Fair Value, Held-to-maturity | 182,317 |
Total, Held-to-maturity, Fair Value | 638,950 |
Due in one year or less, Amortized Cost, Available-for-sale | 40,755 |
Due after one year through five years, Amortized Cost, Available-for-sale | 1,224,722 |
Due after five years through ten years, Amortized Cost, Available-for-sale | 154,864 |
Due after ten years, Amortized Cost, Available-for-sale | 198,470 |
Amortized Cost, Available-for-sale | 1,618,811 | $ 1,718,357
Due in one year or less, Fair Value, Available-for-sale | 41,076 |
Due after one year through five years, Fair Value, Available-for-sale | 1,275,526 |
Due after five years through ten years, Fair Value, Available-for-sale | 159,124 |
Due after ten years, Fair Value, Available-for-sale | 200,341 |
Total Available-for-sale Securities, Debt Maturities, Available-for-sale, Fair Value | $ 1,676,067 | $ 1,740,257

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