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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 6,445 |
Held to Maturity, Due after one year through five years, Amortized Cost | 527,583 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 80,897 |
Held to Maturity, Due after ten years, Amortized Cost | 2,871,675 |
Held to Maturity, Amortized Cost | 3,486,600 | $ 3,534,085
Held to Maturity, Due in one year or less, Estimated Fair Value | 6,467 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 492,746 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 77,212 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,641,784 |
Held to Maturity, Estimated Fair Value | 3,218,209 | 3,360,546
Available-for-sale Securities, Due in one year or less, Amortized Cost | 774,376 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,285,324 |
Available for Sale, Due after five years through ten years, Amortized Cost | 957,816 |
Available for Sale, Due after ten years, Amortized Cost | 13,969,260 |
Debt Securities, Available-for-sale, Amortized Cost | 18,030,136 | 16,602,158
Available for Sale, Due in one year or less, Estimated Fair Value | 770,008 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,185,309 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 898,446 |
Available for Sale, Due after ten years, Estimated Fair Value | 12,715,563 |
Securities available for sale, at estimated fair value | 16,612,686 | 15,043,625
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 697,559 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,935,177 |
Available for Sale, Due after five years through ten years, Amortized Cost | 198,253 |
Available for Sale, Due after ten years, Amortized Cost | 192,972 |
Debt Securities, Available-for-sale, Amortized Cost | 3,023,961 | 3,692,215
Available for Sale, Due in one year or less, Estimated Fair Value | 693,221 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,837,015 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 172,984 |
Available for Sale, Due after ten years, Estimated Fair Value | 137,719 |
Securities available for sale, at estimated fair value | 2,840,939 | 3,442,320
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 | 508,570 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 11,232 |
Held to Maturity, Due after ten years, Amortized Cost | 640,884 |
Held to Maturity, Amortized Cost | 1,160,686 | 1,193,840
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 | 473,543 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 9,570 |
Held to Maturity, Due after ten years, Estimated Fair Value | 633,306 |
Held to Maturity, Estimated Fair Value | 1,116,419 | 1,122,764
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 | 10,157 |
Available for Sale, Due after five years through ten years, Amortized Cost | 2,453 |
Available for Sale, Due after ten years, Amortized Cost | 9,704,074 |
Debt Securities, Available-for-sale, Amortized Cost | 9,716,684 | 8,024,704
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 | 10,161 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 2,503 |
Available for Sale, Due after ten years, Estimated Fair Value | 8,837,599 |
Securities available for sale, at estimated fair value | 8,850,263 | 6,997,902
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 6,445 |
Held to Maturity, Due after one year through five years, Amortized Cost | 17,513 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 69,665 |
Held to Maturity, Due after ten years, Amortized Cost | 2,230,791 |
Held to Maturity, Amortized Cost | 2,324,414 | 2,338,745
Held to Maturity, Due in one year or less, Estimated Fair Value | 6,467 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 17,709 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 67,642 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,008,478 |
Held to Maturity, Estimated Fair Value | 2,100,296 | 2,236,285
Available-for-sale Securities, Due in one year or less, Amortized Cost | 76,817 |
Available for Sale, Due after one year through five years, Amortized Cost | 339,990 |
Available for Sale, Due after five years through ten years, Amortized Cost | 757,110 |
Available for Sale, Due after ten years, Amortized Cost | 4,072,214 |
Debt Securities, Available-for-sale, Amortized Cost | 5,246,131 | 4,842,060
Available for Sale, Due in one year or less, Estimated Fair Value | 76,787 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 338,133 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 722,959 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,740,245 |
Securities available for sale, at estimated fair value | 4,878,124 | 4,560,224
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 | 1,494 |
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 | 1,494 | 1,497
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 | 43,360 | 43,179
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 | $ 43,360 | $ 43,179

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