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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 8,170 |
Held to Maturity, Due after one year through five years, Amortized Cost | 13,508 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 565,101 |
Held to Maturity, Due after ten years, Amortized Cost | 3,032,959 |
Held to Maturity, Amortized Cost | 3,619,738 | $ 2,639,241
Held to Maturity, Due in one year or less, Estimated Fair Value | 8,175 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 13,454 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 511,981 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,998,434 |
Held to Maturity, Estimated Fair Value | 3,532,044 | 2,467,865
Available for Sale, Due in one year or less, Amortized Cost | 1,906,306 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,473,420 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,092,453 |
Available for Sale, Due after ten years, Amortized Cost | 11,450,390 |
Debt Securities, Available-for-sale, Amortized Cost | 17,965,338 | 19,908,432
Available for Sale, Due in one year or less, Estimated Fair Value | 1,886,056 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,286,388 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,040,857 |
Available for Sale, Due after ten years, Estimated Fair Value | 10,322,301 |
Debt Securities, Available-for-sale | 16,578,371 | 18,243,605
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Due in one year or less, Amortized Cost | 1,534,307 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,288,365 |
Available for Sale, Due after five years through ten years, Amortized Cost | 197,809 |
Available for Sale, Due after ten years, Amortized Cost | 192,413 |
Debt Securities, Available-for-sale, Amortized Cost | 5,212,894 | 5,450,546
Available for Sale, Due in one year or less, Estimated Fair Value | 1,514,227 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,101,776 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 167,219 |
Available for Sale, Due after ten years, Estimated Fair Value | 144,367 |
Debt Securities, Available-for-sale | 4,927,589 | 5,051,587
Residential Mortgage Backed Securities [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 | 0 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 512,995 |
Held to Maturity, Due after ten years, Amortized Cost | 737,436 |
Held to Maturity, Amortized Cost | 1,250,431 | 526,122
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 | 0 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 461,253 |
Held to Maturity, Due after ten years, Estimated Fair Value | 735,079 |
Held to Maturity, Estimated Fair Value | 1,196,332 | 460,800
Available for Sale, Due in one year or less, Amortized Cost | 1,740 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,827 |
Available for Sale, Due after five years through ten years, Amortized Cost | 13,985 |
Available for Sale, Due after ten years, Amortized Cost | 7,446,402 |
Debt Securities, Available-for-sale, Amortized Cost | 7,463,954 | 7,316,824
Available for Sale, Due in one year or less, Estimated Fair Value | 1,718 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,826 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 13,963 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,579,175 |
Debt Securities, Available-for-sale | 6,596,682 | 6,376,236
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 8,170 |
Held to Maturity, Due after one year through five years, Amortized Cost | 12,008 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 52,106 |
Held to Maturity, Due after ten years, Amortized Cost | 2,295,523 |
Held to Maturity, Amortized Cost | 2,367,807 | 2,111,619
Held to Maturity, Due in one year or less, Estimated Fair Value | 8,175 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 11,999 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 50,728 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,263,355 |
Held to Maturity, Estimated Fair Value | 2,334,257 | 2,005,634
Available for Sale, Due in one year or less, Amortized Cost | 370,259 |
Available for Sale, Due after one year through five years, Amortized Cost | 183,228 |
Available for Sale, Due after five years through ten years, Amortized Cost | 880,659 |
Available for Sale, Due after ten years, Amortized Cost | 3,811,575 |
Debt Securities, Available-for-sale, Amortized Cost | 5,245,721 | 7,098,635
Available for Sale, Due in one year or less, Estimated Fair Value | 370,111 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 182,786 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 859,675 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,598,759 |
Debt Securities, Available-for-sale | 5,011,331 | 6,773,355
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 | 1,455 |
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 | 1,455 | 1,431
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 |
Debt Securities, Available-for-sale, Amortized Cost | 42,769 | 42,427
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 |
Debt Securities, Available-for-sale | $ 42,769 | $ 42,427

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