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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 7,867 |
Held to Maturity, Due after one year through five years, Amortized Cost | 13,552 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 565,474 |
Held to Maturity, Due after ten years, Amortized Cost | 3,041,540 |
Held to Maturity, Amortized Cost | 3,628,433 | $ 2,639,241
Held to Maturity, Due in one year or less, Estimated Fair Value | 7,863 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 13,317 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 486,858 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,723,653 |
Held to Maturity, Estimated Fair Value | 3,231,691 | 2,467,865
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,535,544 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,986,590 |
Available for Sale, Due after five years through ten years, Amortized Cost | 2,064,052 |
Available for Sale, Due after ten years, Amortized Cost | 11,700,161 |
Debt Securities, Available-for-sale, Amortized Cost | 18,329,017 | 19,908,432
Available for Sale, Due in one year or less, Estimated Fair Value | 1,517,626 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,821,527 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,828,956 |
Available for Sale, Due after ten years, Estimated Fair Value | 9,906,310 |
Securities available for sale, at estimated fair value | 16,117,089 | 18,243,605
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,285,709 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,794,385 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,187,343 |
Available for Sale, Due after ten years, Amortized Cost | 192,321 |
Debt Securities, Available-for-sale, Amortized Cost | 5,459,758 | 5,450,546
Available for Sale, Due in one year or less, Estimated Fair Value | 1,269,227 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,633,956 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,011,055 |
Available for Sale, Due after ten years, Estimated Fair Value | 128,914 |
Securities available for sale, at estimated fair value | 5,043,152 | 5,051,587
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 | 513,264 |
Held to Maturity, Due after ten years, Amortized Cost | 744,891 |
Held to Maturity, Amortized Cost | 1,258,155 | 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 | 439,829 |
Held to Maturity, Due after ten years, Estimated Fair Value | 705,184 |
Held to Maturity, Estimated Fair Value | 1,145,013 | 460,800
Available-for-sale Securities, Due in one year or less, Amortized Cost | 772 |
Available for Sale, Due after one year through five years, Amortized Cost | 3,593 |
Available for Sale, Due after five years through ten years, Amortized Cost | 15,131 |
Available for Sale, Due after ten years, Amortized Cost | 7,569,908 |
Debt Securities, Available-for-sale, Amortized Cost | 7,589,404 | 7,316,824
Available for Sale, Due in one year or less, Estimated Fair Value | 739 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 3,486 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 14,979 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,287,430 |
Securities available for sale, at estimated fair value | 6,306,634 | 6,376,236
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 7,867 |
Held to Maturity, Due after one year through five years, Amortized Cost | 12,052 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 52,210 |
Held to Maturity, Due after ten years, Amortized Cost | 2,296,649 |
Held to Maturity, Amortized Cost | 2,368,778 | 2,111,619
Held to Maturity, Due in one year or less, Estimated Fair Value | 7,863 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 11,880 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 47,029 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,018,469 |
Held to Maturity, Estimated Fair Value | 2,085,241 | 2,005,634
Available-for-sale Securities, Due in one year or less, Amortized Cost | 249,063 |
Available for Sale, Due after one year through five years, Amortized Cost | 188,612 |
Available for Sale, Due after five years through ten years, Amortized Cost | 861,578 |
Available for Sale, Due after ten years, Amortized Cost | 3,937,932 |
Debt Securities, Available-for-sale, Amortized Cost | 5,237,185 | 7,098,635
Available for Sale, Due in one year or less, Estimated Fair Value | 247,660 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 184,085 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 802,922 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,489,966 |
Securities available for sale, at estimated fair value | 4,724,633 | 6,773,355
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 | 1,437 |
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 | 1,437 | 1,431
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 | 42,670 | 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 |
Securities available for sale, at estimated fair value | $ 42,670 | $ 42,427

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