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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 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 | $ 2,126,451 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 33,381 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,658,462 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,529,997 |
Available for Sale, Total Estimated Fair Value | 13,784,913 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,563,378 | $ 1,401,795
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 | 3,442,320 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 249,895 |
Available for Sale, Total Estimated Fair Value | 3,442,320 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 249,895 | 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 | 1,289,852 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 26,420 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,725,498 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,002,734 |
Available for Sale, Total Estimated Fair Value | 6,015,350 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,029,154 | 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 | 836,599 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,961 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,490,644 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 277,368 |
Available for Sale, Total Estimated Fair Value | 4,327,243 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 284,329 | $ 240,152

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