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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, 2020 | Dec. 31, 2019
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 155,963 |
Held to Maturity, Due after one year through five years, Amortized Cost | 464,967 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 723,194 |
Held to Maturity, Due after ten years, Amortized Cost | 601,709 |
Held to Maturity, Amortized Cost | 1,945,833 | $ 2,030,005
Held to Maturity, Due in one year or less, Estimated Fair Value | 156,711 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 482,197 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 769,547 |
Held to Maturity, Due after ten years, Estimated Fair Value | 644,441 |
Held to Maturity, Estimated Fair Value | 2,052,896 | 2,048,675
Available for Sale, Due in one year or less, Amortized Cost | 1,010,272 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,634,771 |
Available for Sale, Due after five years through ten years, Amortized Cost | 661,303 |
Available for Sale, Due after ten years, Amortized Cost | 6,378,704 |
Available for Sale, Amortized Cost | 9,727,401 | 10,877,769
Available for Sale, Due in one year or less, Estimated Fair Value | 1,025,222 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,777,450 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 717,876 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,874,666 |
Available for Sale, Estimated Fair Value | 10,437,565 | 11,269,591
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 22 |
Held to Maturity, Due after one year through five years, Amortized Cost | 165 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 516,118 |
Held to Maturity, Due after ten years, Amortized Cost | 12,479 |
Held to Maturity, Amortized Cost | 528,784 | 530,861
Held to Maturity, Due in one year or less, Estimated Fair Value | 22 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 167 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 556,610 |
Held to Maturity, Due after ten years, Estimated Fair Value | 13,727 |
Held to Maturity, Estimated Fair Value | 570,526 | 521,518
Available for Sale, Due in one year or less, Amortized Cost | 11,833 |
Available for Sale, Due after one year through five years, Amortized Cost | 25,336 |
Available for Sale, Due after five years through ten years, Amortized Cost | 22,583 |
Available for Sale, Due after ten years, Amortized Cost | 1,856,829 |
Available for Sale, Amortized Cost | 1,916,581 | 2,176,275
Available for Sale, Due in one year or less, Estimated Fair Value | 12,278 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 26,724 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 23,116 |
Available for Sale, Due after ten years, Estimated Fair Value | 1,925,561 |
Available for Sale, Estimated Fair Value | 1,987,679 | 2,207,594
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 155,941 |
Held to Maturity, Due after one year through five years, Amortized Cost | 463,302 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 207,076 |
Held to Maturity, Due after ten years, Amortized Cost | 589,230 |
Held to Maturity, Amortized Cost | 1,415,549 | 1,497,644
Held to Maturity, Due in one year or less, Estimated Fair Value | 156,689 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 480,530 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 212,937 |
Held to Maturity, Due after ten years, Estimated Fair Value | 630,714 |
Held to Maturity, Estimated Fair Value | 1,480,870 | 1,525,657
Available for Sale, Due in one year or less, Amortized Cost | 199,697 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,323,635 |
Available for Sale, Due after five years through ten years, Amortized Cost | 638,720 |
Available for Sale, Due after ten years, Amortized Cost | 4,521,875 |
Available for Sale, Amortized Cost | 6,683,927 | 6,717,344
Available for Sale, Due in one year or less, Estimated Fair Value | 201,166 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,442,871 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 694,760 |
Available for Sale, Due after ten years, Estimated Fair Value | 4,949,105 |
Available for Sale, Estimated Fair Value | 7,287,902 | 7,070,997
Other [Member] |  |
Schedule of Available-for-Sale Securities [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 | 1,500 |
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 | 1,500 | 1,500
Available for Sale, 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 | 42,351 | 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 |
Available for Sale, Estimated Fair Value | 42,351 | 42,867
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Due in one year or less, Amortized Cost | 798,742 |
Available for Sale, Due after one year through five years, Amortized Cost | 285,800 |
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 | 1,084,542 | 1,941,283
Available for Sale, Due in one year or less, Estimated Fair Value | 811,778 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 307,855 |
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 |
Available for Sale, Estimated Fair Value | $ 1,119,633 | $ 1,948,133

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