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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 59,282 |
Held to Maturity, Due after one year through five years, Amortized Cost | 15,524 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 551,088 |
Held to Maturity, Due after ten years, Amortized Cost | 3,065,593 |
Held to Maturity, Amortized Cost | 3,691,487 | $ 2,639,241
Held to Maturity, Due in one year or less, Estimated Fair Value | 59,242 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 15,380 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 487,459 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,981,848 |
Held to Maturity, Estimated Fair Value | 3,543,929 | 2,467,865
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,725,618 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,864,894 |
Available for Sale, Due after five years through ten years, Amortized Cost | 2,283,180 |
Available for Sale, Due after ten years, Amortized Cost | 11,944,462 |
Debt Securities, Available-for-sale, Amortized Cost | 18,860,732 | 19,908,432
Available for Sale, Due in one year or less, Estimated Fair Value | 1,696,603 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,740,369 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 2,077,949 |
Available for Sale, Due after ten years, Estimated Fair Value | 10,691,758 |
Securities available for sale, at estimated fair value | 17,249,257 | 18,243,605
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 1,286,197 |
Available for Sale, Due after one year through five years, Amortized Cost | 2,542,538 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,435,692 |
Available for Sale, Due after ten years, Amortized Cost | 192,229 |
Debt Securities, Available-for-sale, Amortized Cost | 5,456,656 | 5,450,546
Available for Sale, Due in one year or less, Estimated Fair Value | 1,257,329 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 2,420,131 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,250,420 |
Available for Sale, Due after ten years, Estimated Fair Value | 145,008 |
Securities available for sale, at estimated fair value | 5,072,888 | 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 | 513,530 |
Held to Maturity, Due after ten years, Amortized Cost | 752,288 |
Held to Maturity, Amortized Cost | 1,265,818 | 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 | 450,850 |
Held to Maturity, Due after ten years, Estimated Fair Value | 742,682 |
Held to Maturity, Estimated Fair Value | 1,193,532 | 460,800
Available-for-sale Securities, Due in one year or less, Amortized Cost | 310 |
Available for Sale, Due after one year through five years, Amortized Cost | 4,985 |
Available for Sale, Due after five years through ten years, Amortized Cost | 15,986 |
Available for Sale, Due after ten years, Amortized Cost | 7,704,122 |
Debt Securities, Available-for-sale, Amortized Cost | 7,725,403 | 7,316,824
Available for Sale, Due in one year or less, Estimated Fair Value | 305 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 4,865 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 15,898 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,771,707 |
Securities available for sale, at estimated fair value | 6,792,775 | 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 | 59,282 |
Held to Maturity, Due after one year through five years, Amortized Cost | 14,024 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 37,558 |
Held to Maturity, Due after ten years, Amortized Cost | 2,313,305 |
Held to Maturity, Amortized Cost | 2,424,169 | 2,111,619
Held to Maturity, Due in one year or less, Estimated Fair Value | 59,242 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 13,949 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 36,609 |
Held to Maturity, Due after ten years, Estimated Fair Value | 2,239,166 |
Held to Maturity, Estimated Fair Value | 2,348,966 | 2,005,634
Available-for-sale Securities, Due in one year or less, Amortized Cost | 439,111 |
Available for Sale, Due after one year through five years, Amortized Cost | 317,371 |
Available for Sale, Due after five years through ten years, Amortized Cost | 831,502 |
Available for Sale, Due after ten years, Amortized Cost | 4,048,111 |
Debt Securities, Available-for-sale, Amortized Cost | 5,636,095 | 7,098,635
Available for Sale, Due in one year or less, Estimated Fair Value | 438,969 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 315,373 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 811,631 |
Available for Sale, Due after ten years, Estimated Fair Value | 3,775,043 |
Securities available for sale, at estimated fair value | 5,341,016 | 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 | 1,431 |
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 | 1,431 | 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 | 42,578 | 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 | $ 42,578 | $ 42,427

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