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Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 12,773 |
Held to Maturity, Due after one year through five years, Amortized Cost | 165,519 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 527,907 |
Held to Maturity, Due after ten years, Amortized Cost | 792,945 |
Held to Maturity, Residential mortgage-backed securities, Amortized Cost | 530,861 |
Held-to-maturity, Equity Securities, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 2,030,005 | $ 1,106,057
Held to Maturity, Due in one year or less, Estimated Fair Value | 12,847 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 169,970 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 541,249 |
Held to Maturity, Due after ten years, Estimated Fair Value | 803,091 |
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value | 521,518 |
Held-to-maturity, Equity Securities, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 2,048,675 | 1,116,953
Available for Sale, Due in one year or less, Amortized Cost | 508,575 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,317,774 |
Available for Sale, Due after five years through ten years, Amortized Cost | 451,885 |
Available for Sale, Due after ten years, Amortized Cost | 6,380,393 |
Available For Sale, Residential mortgage-backed securities, Amortized Cost | 2,176,275 |
Available for Sale, Equity securities, Amortized Cost | 42,867 |
Available for Sale, Amortized Cost | 10,877,769 | 11,410,447
Available for Sale, Due in one year or less, Estimated Fair Value | 509,404 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,344,035 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 478,800 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,686,891 |
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value | 2,207,594 |
Available for Sale, Equity securities, Estimated Fair Value | 42,867 |
Available for Sale, Estimated Fair Value | $ 11,269,591 | $ 11,387,321

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