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Securities - Securities Available for Sale, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 326,569 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 921 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,715,142 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,160,128 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,041,711 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,161,049 | $ 1,401,795
U.S. Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,987,746 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 200,877 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,987,746 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 200,877 | 285,305
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 719 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,093,851 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 748,155 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,094,570 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 748,157 | 876,338
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 325,850 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 919 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,633,545 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 211,096 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,959,395 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 212,015 | $ 240,152

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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