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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 31,285 | $ 425,896
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 96 | 2,596
Held to Maturity, More than 12 Months, Estimated Fair Value | 74,113 | 183,245
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,688 | 3,739
Held to Maturity, Total Estimated Fair Value | 105,398 | 609,141
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2,784 | 6,335
Available for Sale, Less than 12 Months, Estimated Fair Value | 2,628,920 | 4,198,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12,004 | 108,110
Available for Sale, More than 12 Months, Estimated Fair Value | 1,401,340 | 6,413
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 22,773 | 262
Available for Sale, Total Estimated Fair Value | 4,030,260 | 4,205,068
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 34,777 | 108,372
US Treasury Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Available for Sale, Less than 12 Months, Estimated Fair Value | 2,336,081 | 1,421,216
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,861 | 8,945
Available for Sale, More than 12 Months, Estimated Fair Value | 517,575 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,871 | 0
Available for Sale, Total Estimated Fair Value | 2,853,656 | 1,421,216
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 15,732 | 8,945
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 2,694 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 38 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Held to Maturity, Total Estimated Fair Value | 2,694 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 38 | 0
Available for Sale, Less than 12 Months, Estimated Fair Value | 144,264 | 81,442
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 949 | 1,031
Available for Sale, More than 12 Months, Estimated Fair Value | 45,436 | 6,413
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,301 | 262
Available for Sale, Total Estimated Fair Value | 189,700 | 87,855
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,250 | 1,293
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 28,591 | 425,896
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 58 | 2,596
Held to Maturity, More than 12 Months, Estimated Fair Value | 74,113 | 183,245
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,688 | 3,739
Held to Maturity, Total Estimated Fair Value | 102,704 | 609,141
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2,746 | 6,335
Available for Sale, Less than 12 Months, Estimated Fair Value | 148,575 | 2,695,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,194 | 98,134
Available for Sale, More than 12 Months, Estimated Fair Value | 838,329 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 15,601 | 0
Available for Sale, Total Estimated Fair Value | 986,904 | 2,695,997
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 16,795 | 98,134
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 0

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