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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Mar. 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 | $ 29,315 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 253 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 120,214 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,790 |
Held to Maturity, Total Estimated Fair Value | 149,529 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,043 | $ 6,335
Available for Sale, Less than 12 Months, Estimated Fair Value | 3,865,281 |
Available for Sale, Less than 12 Months, Unrealized Losses | 91,724 |
Available for Sale, More than 12 Months, Estimated Fair Value | 6,200 |
Available for Sale, More than 12 Months, Unrealized Losses | 260 |
Available for Sale, Total Estimated Fair Value | 3,871,481 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 91,984 | 108,372
Residential mortgage-backed 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 | 61,669 |
Available for Sale, Less than 12 Months, Unrealized Losses | 1,166 |
Available for Sale, More than 12 Months, Estimated Fair Value | 6,200 |
Available for Sale, More than 12 Months, Unrealized Losses | 260 |
Available for Sale, Total Estimated Fair Value | 67,869 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,426 | 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 | 27,969 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 249 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 120,214 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,790 |
Held to Maturity, Total Estimated Fair Value | 148,183 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,039 | 6,335
Available for Sale, Less than 12 Months, Estimated Fair Value | 2,182,114 |
Available for Sale, Less than 12 Months, Unrealized Losses | 82,860 |
Available for Sale, More than 12 Months, Estimated Fair Value | 0 |
Available for Sale, More than 12 Months, Unrealized Losses | 0 |
Available for Sale, Total Estimated Fair Value | 2,182,114 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 82,860 | 98,134
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 1,346 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 |
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 | 1,346 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 4 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
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 | 1,621,498 |
Available for Sale, Less than 12 Months, Unrealized Losses | 7,698 |
Available for Sale, More than 12 Months, Estimated Fair Value | 0 |
Available for Sale, More than 12 Months, Unrealized Losses | 0 |
Available for Sale, Total Estimated Fair Value | 1,621,498 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 7,698 | $ 8,945

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