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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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 | $ 3,267,559 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 38,301 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 51,638 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,764 |
Available for Sale, Total Estimated Fair Value | 3,319,197 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 40,065 | $ 4
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 684,242 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,602 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available for Sale, Total Estimated Fair Value | 684,242 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 9,602 | 0
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 | 2,219,261 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23,625 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 45,963 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,464 |
Available for Sale, Total Estimated Fair Value | 2,265,224 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 25,089 | 4
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 | 364,056 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,074 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,675 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 300 |
Available for Sale, Total Estimated Fair Value | 369,731 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 5,374 | $ 0

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