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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 890,533 | $ 205,686
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,257 | 541
Held to Maturity, More than 12 Months, Estimated Fair Value | 408 | 7,986
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 96
Held to Maturity, Total Estimated Fair Value | 890,941 | 213,672
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 10,261 | 637
Available for Sale, Less than 12 Months, Estimated Fair Value | 972,926 | 1,289,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13,056 | 7,231
Available for Sale, More than 12 Months, Estimated Fair Value | 231,436 | 5,411,669
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 521 | 101,506
Available for Sale, Total Estimated Fair Value | 1,204,362 | 6,700,673
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 13,577 | 108,737
US Treasury Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Less than 12 Months, Estimated Fair Value | 636,999 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12,070 | 0
Available for Sale, More than 12 Months, Estimated Fair Value | 199,980 | 3,139,639
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14 | 29,500
Available for Sale, Total Estimated Fair Value | 836,979 | 3,139,639
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 12,084 | 29,500
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 519,099 | 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,361 | 0
Held to Maturity, More than 12 Months, Estimated Fair Value | 408 | 2,034
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 85
Held to Maturity, Total Estimated Fair Value | 519,507 | 2,034
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 9,365 | 85
Available for Sale, Less than 12 Months, Estimated Fair Value | 276,249 | 152,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 782 | 205
Available for Sale, More than 12 Months, Estimated Fair Value | 31,456 | 213,982
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 507 | 6,342
Available for Sale, Total Estimated Fair Value | 307,705 | 366,664
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,289 | 6,547
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 371,434 | 205,686
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 896 | 541
Held to Maturity, More than 12 Months, Estimated Fair Value | 0 | 5,952
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 11
Held to Maturity, Total Estimated Fair Value | 371,434 | 211,638
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 896 | 552
Available for Sale, Less than 12 Months, Estimated Fair Value | 59,678 | 1,136,322
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 204 | 7,026
Available for Sale, More than 12 Months, Estimated Fair Value | 0 | 2,058,048
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 65,664
Available for Sale, Total Estimated Fair Value | 59,678 | 3,194,370
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 204 | 72,690
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 0

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