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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, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 121,042 |
Held to Maturity, Due after one year through five years, Amortized Cost | 31,034 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 524,201 |
Held to Maturity, Due after ten years, Amortized Cost | 1,497,965 |
Held to Maturity, Amortized Cost | 2,174,242 | $ 1,749,337
Held to Maturity, Due in one year or less, Estimated Fair Value | 120,786 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 30,805 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 458,364 |
Held to Maturity, Due after ten years, Estimated Fair Value | 1,307,332 |
Held to Maturity, Estimated Fair Value | 1,917,287 | 1,809,143
Available-for-sale Securities, Due in one year or less, Amortized Cost | 250,345 |
Available for Sale, Due after one year through five years, Amortized Cost | 5,301,345 |
Available for Sale, Due after five years through ten years, Amortized Cost | 2,395,444 |
Available for Sale, Due after ten years, Amortized Cost | 11,307,492 |
Debt Securities, Available-for-sale, Amortized Cost | 19,297,009 | 13,445,888
Available for Sale, Due in one year or less, Estimated Fair Value | 250,902 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 5,119,877 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 2,144,310 |
Available for Sale, Due after ten years, Estimated Fair Value | 9,841,635 |
Securities available for sale, at estimated fair value | 17,399,107 | 13,924,628
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
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 | 3,821,606 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,433,912 |
Available for Sale, Due after ten years, Amortized Cost | 191,960 |
Debt Securities, Available-for-sale, Amortized Cost | 5,447,478 | 2,165,702
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 | 3,648,015 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,232,969 |
Available for Sale, Due after ten years, Estimated Fair Value | 141,633 |
Securities available for sale, at estimated fair value | 5,022,617 | 2,179,433
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 | 514,321 |
Held to Maturity, Due after ten years, Amortized Cost | 12,076 |
Held to Maturity, Amortized Cost | 526,397 | 527,264
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 | 448,514 |
Held to Maturity, Due after ten years, Estimated Fair Value | 9,859 |
Held to Maturity, Estimated Fair Value | 458,373 | 546,030
Available-for-sale Securities, Due in one year or less, Amortized Cost | 28 |
Available for Sale, Due after one year through five years, Amortized Cost | 9,355 |
Available for Sale, Due after five years through ten years, Amortized Cost | 17,253 |
Available for Sale, Due after ten years, Amortized Cost | 6,658,782 |
Debt Securities, Available-for-sale, Amortized Cost | 6,685,418 | 4,059,692
Available for Sale, Due in one year or less, Estimated Fair Value | 27 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 9,130 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 17,167 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,672,485 |
Securities available for sale, at estimated fair value | 5,698,809 | 4,066,265
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 121,042 |
Held to Maturity, Due after one year through five years, Amortized Cost | 29,534 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 9,880 |
Held to Maturity, Due after ten years, Amortized Cost | 1,485,889 |
Held to Maturity, Amortized Cost | 1,646,345 | 1,220,573
Held to Maturity, Due in one year or less, Estimated Fair Value | 120,786 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 29,362 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 9,850 |
Held to Maturity, Due after ten years, Estimated Fair Value | 1,297,473 |
Held to Maturity, Estimated Fair Value | 1,457,471 | 1,261,613
Available-for-sale Securities, Due in one year or less, Amortized Cost | 250,317 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,470,384 |
Available for Sale, Due after five years through ten years, Amortized Cost | 944,279 |
Available for Sale, Due after ten years, Amortized Cost | 4,456,750 |
Debt Securities, Available-for-sale, Amortized Cost | 7,121,730 | 7,178,135
Available for Sale, Due in one year or less, Estimated Fair Value | 250,875 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,462,732 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 894,174 |
Available for Sale, Due after ten years, Estimated Fair Value | 4,027,517 |
Securities available for sale, at estimated fair value | 6,635,298 | 7,636,571
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 | 1,443 |
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 | 1,443 | 1,500
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 | 42,383 | 42,359
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 | $ 42,383 | $ 42,359

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