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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, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 9,072 |
Held to Maturity, Due after one year through five years, Amortized Cost | 528,192 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 62,934 |
Held to Maturity, Due after ten years, Amortized Cost | 2,933,887 |
Held to Maturity, Amortized Cost | 3,534,085 | $ 3,619,738
Held to Maturity, Due in one year or less, Estimated Fair Value | 9,067 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 477,554 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 58,653 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,815,272 |
Held to Maturity, Estimated Fair Value | 3,360,546 | 3,532,044
Available for Sale, Due in one year or less, Amortized Cost | 1,381,425 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,430,874 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,015,030 |
Available for Sale, Due after ten years, Amortized Cost | 11,731,650 |
Debt Securities, Available-for-sale, Amortized Cost | 16,602,158 | 17,965,338
Available for Sale, Due in one year or less, Estimated Fair Value | 1,373,388 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,278,099 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 942,623 |
Available for Sale, Due after ten years, Estimated Fair Value | 10,406,336 |
Debt Securities, Available-for-sale | 15,043,625 | 16,578,371
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Due in one year or less, Amortized Cost | 1,096,734 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,204,591 |
Available for Sale, Due after five years through ten years, Amortized Cost | 198,105 |
Available for Sale, Due after ten years, Amortized Cost | 192,785 |
Debt Securities, Available-for-sale, Amortized Cost | 3,692,215 | 5,212,894
Available for Sale, Due in one year or less, Estimated Fair Value | 1,088,890 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,054,258 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 165,031 |
Available for Sale, Due after ten years, Estimated Fair Value | 134,141 |
Debt Securities, Available-for-sale | 3,442,320 | 4,927,589
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 | 510,490 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 11,244 |
Held to Maturity, Due after ten years, Amortized Cost | 672,106 |
Held to Maturity, Amortized Cost | 1,193,840 | 1,250,431
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 | 459,859 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 9,164 |
Held to Maturity, Due after ten years, Estimated Fair Value | 653,741 |
Held to Maturity, Estimated Fair Value | 1,122,764 | 1,196,332
Available for Sale, Due in one year or less, Amortized Cost | 39 |
Available for Sale, Due after one year through five years, Amortized Cost | 869 |
Available for Sale, Due after five years through ten years, Amortized Cost | 12,553 |
Available for Sale, Due after ten years, Amortized Cost | 8,011,243 |
Debt Securities, Available-for-sale, Amortized Cost | 8,024,704 | 7,463,954
Available for Sale, Due in one year or less, Estimated Fair Value | 39 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 881 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 12,588 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,984,394 |
Debt Securities, Available-for-sale | 6,997,902 | 6,596,682
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 7,572 |
Held to Maturity, Due after one year through five years, Amortized Cost | 17,702 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 51,690 |
Held to Maturity, Due after ten years, Amortized Cost | 2,261,781 |
Held to Maturity, Amortized Cost | 2,338,745 | 2,367,807
Held to Maturity, Due in one year or less, Estimated Fair Value | 7,570 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 17,695 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 49,489 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,161,531 |
Held to Maturity, Estimated Fair Value | 2,236,285 | 2,334,257
Available for Sale, Due in one year or less, Amortized Cost | 284,652 |
Available for Sale, Due after one year through five years, Amortized Cost | 225,414 |
Available for Sale, Due after five years through ten years, Amortized Cost | 804,372 |
Available for Sale, Due after ten years, Amortized Cost | 3,527,622 |
Debt Securities, Available-for-sale, Amortized Cost | 4,842,060 | 5,245,721
Available for Sale, Due in one year or less, Estimated Fair Value | 284,459 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 222,960 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 765,004 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,287,801 |
Debt Securities, Available-for-sale | 4,560,224 | 5,011,331
Other [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 1,500 |
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 | 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 | 1,497 |
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 | 0 |
Held to Maturity, Due after ten years, Estimated Fair Value | 0 |
Held to Maturity, Estimated Fair Value | 1,497 | 1,455
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 | 43,179 | 42,769
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 | $ 43,179 | $ 42,769

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