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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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 | $ 2,689,753 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16,918 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,642,997 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,384,877 |
Available for Sale, Total Estimated Fair Value | 15,332,750 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,401,795 | $ 1,681,985
US 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 | 4,927,590 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 285,305 |
Available for Sale, Total Estimated Fair Value | 4,927,590 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 285,305 | 398,959
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 | 879,380 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,883 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,062,456 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 869,455 |
Available for Sale, Total Estimated Fair Value | 5,941,836 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 876,338 | 948,638
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 | 1,810,373 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,035 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,652,951 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 230,117 |
Available for Sale, Total Estimated Fair Value | 4,463,324 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 240,152 | $ 334,388

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