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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Total available-for-sale debt securities, Amortized Cost, Less than one year | $ 47,465 |
Total available-for-sale debt securities, Amortized Cost, 1-5 years | 145,739 |
Total available-for-sale debt securities, Amortized Cost, 5-10 years | 358,854 |
Total available-for-sale debt securities, Amortized Cost, Over 10 years | 2,190,424 |
Available-for-sale, Amortized Cost | 2,742,482 | $ 1,916,658
Total held-to-maturity debt securities, Amortized Cost, Less than one year | 11,759 |
Total held-to-maturity debt securities, Amortized Cost, 1-5 years | 133,053 |
Total held-to-maturity debt securities, Amortized Cost, 5-10 years | 228,148 |
Total held-to-maturity debt securities, Amortized Cost, Over 10 years | 440,780 |
Held-to-maturity, Amortized Cost | 813,740 | 731,212
Total debt securities, Amortized Cost | 3,556,222 |
Total available-for-sale debt securities, Fair Value, Less than one year | 47,583 |
Total available-for-sale debt securities, Fair Value, 1-5 years | 152,800 |
Total available-for-sale debt securities, Fair Value, 5-10 years | 366,119 |
Total available-for-sale debt securities, Fair Value, Over 10 years | 2,208,710 |
Total available-for-sale debt securities, Fair Value | 2,775,212 | 1,978,136
Total held-to-maturity debt securities, Fair Value, Less than one year | 11,872 |
Total held-to-maturity debt securities, Fair Value, 1-5 years | 140,315 |
Total held-to-maturity debt securities, Fair Value, 5-10 years | 237,907 |
Total held-to-maturity debt securities, Fair Value, Over 10 years | 449,778 |
Total held-to-maturity debt securities, Fair Value | 839,872 | 768,183
Total debt securities, Fair Value | $ 3,615,084 | $ 2,746,319

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