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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 25,254 |
Held to Maturity, Due after one year through five years, Amortized Cost | 166,412 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 530,808 |
Held to Maturity, Due after ten years, Amortized Cost | 295,892 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 2,472 |
Held-to-maturity Securities, Equity Securities, Amortized cost | 0 |
Held to Maturity, Amortized Cost | 1,020,838 | $ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value | 25,418 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 170,675 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 543,464 |
Held to Maturity, Due after ten years, Estimated Fair Value | 305,371 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 2,495 |
Held-to-maturity Securities, Equity Securities, Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 1,047,423 | 1,116,953
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,882,023 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,328,841 |
Available for Sale, Due after five years through ten years, Amortized Cost | 453,192 |
Available for Sale, Due after ten years, Amortized Cost | 6,074,419 |
Available for Sale, Residential mortgage-backed securities, Amortized Cost | 2,198,466 |
Available-for-sale Securities, Equity Securities, Amortized cost | 42,825 |
Available for Sale, Amortized Cost | 11,979,766 | 11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value | 1,881,435 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,356,833 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 480,892 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,418,009 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 2,240,452 |
Available For Sale Securities Equity Securities Fair Value | 42,825 |
Available for Sale, Estimated Fair Value | $ 12,420,446 | $ 11,387,321

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