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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, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 55,180 |
Held to Maturity, Due after one year through five years, Amortized Cost | 357,140 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 915,745 |
Held to Maturity, Due after ten years, Amortized Cost | 623,479 |
Held to Maturity, Amortized Cost | 1,951,544 | $ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value | 56,043 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 371,268 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 971,973 |
Held to Maturity, Due after ten years, Estimated Fair Value | 659,571 |
Held to Maturity, Estimated Fair Value | 2,058,855 | 2,048,675
Available-for-sale Securities, Due in one year or less, Amortized Cost | 501,059 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,860,437 |
Available for Sale, Due after five years through ten years, Amortized Cost | 719,603 |
Available for Sale, Due after ten years, Amortized Cost | 6,791,241 |
Available for Sale, Amortized Cost | 9,914,688 | 10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value | 509,410 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,995,106 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 780,565 |
Available for Sale, Due after ten years, Estimated Fair Value | 7,277,051 |
Securities available for sale, estimated fair value | 10,604,480 | 11,269,591
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 299,355 |
Available for Sale, Due after one year through five years, Amortized Cost | 784,855 |
Available for Sale, Due after five years through ten years, Amortized Cost | 0 |
Available for Sale, Due after ten years, Amortized Cost | 0 |
Available for Sale, Amortized Cost | 1,084,210 | 1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value | 305,121 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 819,844 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 0 |
Available for Sale, Due after ten years, Estimated Fair Value | 0 |
Securities available for sale, estimated fair value | 1,124,965 | 1,948,133
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 0 |
Held to Maturity, Due after one year through five years, Amortized Cost | 231 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 516,368 |
Held to Maturity, Due after ten years, Amortized Cost | 12,691 |
Held to Maturity, Amortized Cost | 529,290 | 530,861
Held to Maturity, Due in one year or less, Estimated Fair Value | 0 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 233 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 560,456 |
Held to Maturity, Due after ten years, Estimated Fair Value | 14,105 |
Held to Maturity, Estimated Fair Value | 574,794 | 521,518
Available-for-sale Securities, Due in one year or less, Amortized Cost | 175 |
Available for Sale, Due after one year through five years, Amortized Cost | 45,832 |
Available for Sale, Due after five years through ten years, Amortized Cost | 22,949 |
Available for Sale, Due after ten years, Amortized Cost | 2,023,228 |
Available for Sale, Amortized Cost | 2,092,184 | 2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value | 182 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 47,995 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 23,439 |
Available for Sale, Due after ten years, Estimated Fair Value | 2,092,546 |
Securities available for sale, estimated fair value | 2,164,162 | 2,207,594
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 55,180 |
Held to Maturity, Due after one year through five years, Amortized Cost | 355,409 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 399,377 |
Held to Maturity, Due after ten years, Amortized Cost | 610,788 |
Held to Maturity, Amortized Cost | 1,420,754 | 1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value | 56,043 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 369,536 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 411,517 |
Held to Maturity, Due after ten years, Estimated Fair Value | 645,466 |
Held to Maturity, Estimated Fair Value | 1,482,562 | 1,525,657
Available-for-sale Securities, Due in one year or less, Amortized Cost | 201,529 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,029,750 |
Available for Sale, Due after five years through ten years, Amortized Cost | 696,654 |
Available for Sale, Due after ten years, Amortized Cost | 4,768,013 |
Available for Sale, Amortized Cost | 6,695,946 | 6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value | 204,107 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,127,267 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 757,126 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,184,505 |
Securities available for sale, estimated fair value | 7,273,005 | 7,070,997
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 0 |
Held to Maturity, Due after one year through five years, Amortized Cost | 1,500 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 0 |
Held to Maturity, Due after ten years, Amortized Cost | 0 |
Held to Maturity, Amortized Cost | 1,500 | 1,500
Held to Maturity, Due in one year or less, Estimated Fair Value | 0 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 1,499 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 0 |
Held to Maturity, Due after ten years, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 1,499 | 1,500
Available-for-sale Securities, Due in one year or less, Amortized Cost | 0 |
Available for Sale, Due after one year through five years, Amortized Cost | 0 |
Available for Sale, Due after five years through ten years, Amortized Cost | 0 |
Available for Sale, Due after ten years, Amortized Cost | 0 |
Available for Sale, Amortized Cost | 42,348 | 42,867
Available for Sale, Due in one year or less, Estimated Fair Value | 0 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 0 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 0 |
Available for Sale, Due after ten years, Estimated Fair Value | 0 |
Securities available for sale, estimated fair value | $ 42,348 | $ 42,867

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