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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 10,631 |
Held to Maturity, Due after one year through five years, Amortized Cost | 4,281 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 563,809 |
Held to Maturity, Due after ten years, Amortized Cost | 3,022,318 |
Held to Maturity, Amortized Cost | 3,601,039 | $ 3,619,738
Held to Maturity, Due in one year or less, Estimated Fair Value | 10,558 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 4,268 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 506,223 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,930,267 |
Held to Maturity, Estimated Fair Value | 3,451,316 | 3,532,044
Available-for-sale Securities, Due in one year or less, Amortized Cost | 729,453 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,527,430 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,059,756 |
Available for Sale, Due after ten years, Amortized Cost | 11,408,116 |
Debt Securities, Available-for-sale, Amortized Cost | 16,767,625 | 17,965,338
Available for Sale, Due in one year or less, Estimated Fair Value | 715,897 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,315,269 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 995,014 |
Available for Sale, Due after ten years, Estimated Fair Value | 10,112,533 |
Securities available for sale, at estimated fair value | 15,181,583 | 16,578,371
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 499,348 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,291,567 |
Available for Sale, Due after five years through ten years, Amortized Cost | 197,882 |
Available for Sale, Due after ten years, Amortized Cost | 192,504 |
Debt Securities, Available-for-sale, Amortized Cost | 4,181,301 | 5,212,894
Available for Sale, Due in one year or less, Estimated Fair Value | 486,430 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,082,345 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 164,133 |
Available for Sale, Due after ten years, Estimated Fair Value | 139,664 |
Securities available for sale, at estimated fair value | 3,872,572 | 4,927,589
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 | 0 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 511,806 |
Held to Maturity, Due after ten years, Amortized Cost | 727,614 |
Held to Maturity, Amortized Cost | 1,239,420 | 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 | 0 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 455,963 |
Held to Maturity, Due after ten years, Estimated Fair Value | 714,388 |
Held to Maturity, Estimated Fair Value | 1,170,351 | 1,196,332
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,348 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,272 |
Available for Sale, Due after five years through ten years, Amortized Cost | 13,807 |
Available for Sale, Due after ten years, Amortized Cost | 7,455,768 |
Debt Securities, Available-for-sale, Amortized Cost | 7,472,195 | 7,463,954
Available for Sale, Due in one year or less, Estimated Fair Value | 1,333 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,275 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 13,793 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,456,224 |
Securities available for sale, at estimated fair value | 6,472,625 | 6,596,682
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 9,131 |
Held to Maturity, Due after one year through five years, Amortized Cost | 4,281 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 52,003 |
Held to Maturity, Due after ten years, Amortized Cost | 2,294,704 |
Held to Maturity, Amortized Cost | 2,360,119 | 2,367,807
Held to Maturity, Due in one year or less, Estimated Fair Value | 9,092 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 4,268 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 50,260 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,215,879 |
Held to Maturity, Estimated Fair Value | 2,279,499 | 2,334,257
Available-for-sale Securities, Due in one year or less, Amortized Cost | 228,757 |
Available for Sale, Due after one year through five years, Amortized Cost | 234,591 |
Available for Sale, Due after five years through ten years, Amortized Cost | 848,067 |
Available for Sale, Due after ten years, Amortized Cost | 3,759,844 |
Debt Securities, Available-for-sale, Amortized Cost | 5,071,259 | 5,245,721
Available for Sale, Due in one year or less, Estimated Fair Value | 228,134 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 231,649 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 817,088 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,516,645 |
Securities available for sale, at estimated fair value | 4,793,516 | 5,011,331
Other Investments [Member] |  |
Schedule of Investments [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 | 1,466 |
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 | 1,466 | 1,455
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 |
Debt Securities, Available-for-sale, Amortized Cost | 42,870 | 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 |
Securities available for sale, at estimated fair value | $ 42,870 | $ 42,769

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