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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, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | $ 262,111 |
Held to Maturity, Due after one year through five years, Amortized Cost | 337,335 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 631,698 |
Held to Maturity, Due after ten years, Amortized Cost | 582,419 |
Held to Maturity, Amortized Cost | 1,813,563 | $ 1,945,833
Held to Maturity, Due in one year or less, Estimated Fair Value | 265,690 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 348,215 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 663,290 |
Held to Maturity, Due after ten years, Estimated Fair Value | 619,040 |
Held to Maturity, Estimated Fair Value | 1,896,235 | 2,052,896
Available-for-sale Securities, Due in one year or less, Amortized Cost | 932,020 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,672,288 |
Available for Sale, Due after five years through ten years, Amortized Cost | 1,037,740 |
Available for Sale, Due after ten years, Amortized Cost | 6,575,069 |
Available for Sale, Amortized Cost | 10,259,473 | 9,727,401
Available for Sale, Due in one year or less, Estimated Fair Value | 938,579 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,796,638 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 1,093,251 |
Available for Sale, Due after ten years, Estimated Fair Value | 6,969,702 |
Securities available for sale, estimated fair value | 10,840,526 | 10,437,565
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Due in one year or less, Amortized Cost | 799,521 |
Available for Sale, Due after one year through five years, Amortized Cost | 285,676 |
Available for Sale, Due after five years through ten years, Amortized Cost | 197,086 |
Available for Sale, Due after ten years, Amortized Cost | 191,517 |
Available for Sale, Amortized Cost | 1,473,800 | 1,084,542
Available for Sale, Due in one year or less, Estimated Fair Value | 804,722 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 302,656 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 194,344 |
Available for Sale, Due after ten years, Estimated Fair Value | 196,000 |
Securities available for sale, estimated fair value | 1,497,722 | 1,119,633
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 48 |
Held to Maturity, Due after one year through five years, Amortized Cost | 54 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 515,611 |
Held to Maturity, Due after ten years, Amortized Cost | 12,245 |
Held to Maturity, Amortized Cost | 527,958 | 528,784
Held to Maturity, Due in one year or less, Estimated Fair Value | 48 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 55 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 544,894 |
Held to Maturity, Due after ten years, Estimated Fair Value | 13,089 |
Held to Maturity, Estimated Fair Value | 558,086 | 570,526
Available-for-sale Securities, Due in one year or less, Amortized Cost | 3,453 |
Available for Sale, Due after one year through five years, Amortized Cost | 19,270 |
Available for Sale, Due after five years through ten years, Amortized Cost | 22,748 |
Available for Sale, Due after ten years, Amortized Cost | 1,683,727 |
Available for Sale, Amortized Cost | 1,729,198 | 1,916,581
Available for Sale, Due in one year or less, Estimated Fair Value | 3,592 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 20,327 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 23,379 |
Available for Sale, Due after ten years, Estimated Fair Value | 1,714,331 |
Securities available for sale, estimated fair value | 1,761,629 | 1,987,679
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Due in one year or less, Amortized Cost | 260,563 |
Held to Maturity, Due after one year through five years, Amortized Cost | 337,281 |
Held to Maturity, Due after five years through ten years, Amortized Cost | 116,087 |
Held to Maturity, Due after ten years, Amortized Cost | 570,174 |
Held to Maturity, Amortized Cost | 1,284,105 | 1,415,549
Held to Maturity, Due in one year or less, Estimated Fair Value | 264,142 |
Held to Maturity, Due after one year through five years, Estimated Fair Value | 348,160 |
Held to Maturity, Due after five years through ten years, Estimated Fair Value | 118,396 |
Held to Maturity, Due after ten years, Estimated Fair Value | 605,951 |
Held to Maturity, Estimated Fair Value | 1,336,649 | 1,480,870
Available-for-sale Securities, Due in one year or less, Amortized Cost | 129,046 |
Available for Sale, Due after one year through five years, Amortized Cost | 1,367,342 |
Available for Sale, Due after five years through ten years, Amortized Cost | 817,906 |
Available for Sale, Due after ten years, Amortized Cost | 4,699,825 |
Available for Sale, Amortized Cost | 7,014,119 | 6,683,927
Available for Sale, Due in one year or less, Estimated Fair Value | 130,265 |
Available for Sale, Due after one year through five years, Estimated Fair Value | 1,473,655 |
Available for Sale, Due after five years through ten years, Estimated Fair Value | 875,528 |
Available for Sale, Due after ten years, Estimated Fair Value | 5,059,371 |
Securities available for sale, estimated fair value | 7,538,819 | 7,287,902
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 | 1,500 |
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 | 1,500 | 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 |
Available for Sale, Amortized Cost | 42,356 | 42,351
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, estimated fair value | $ 42,356 | $ 42,351

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