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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 1,499 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 413 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 |
Held to Maturity, Total Estimated Fair Value | 1,912 |
Held-to-maturity Securities, Gross Unrealized Losses | 3 | $ 637
Available for Sale, Less than 12 Months, Estimated Fair Value | 91,276 |
Available for Sale, Less than 12 Months, Unrealized Losses | 703 |
Available for Sale, More than 12 Months, Estimated Fair Value | 1,766,616 |
Available for Sale, More than 12 Months, Unrealized Losses | 2,221 |
Available for Sale, Total Estimated Fair Value | 1,857,892 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 2,924 | 108,737
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 413 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 |
Held to Maturity, Total Estimated Fair Value | 413 |
Held-to-maturity Securities, Gross Unrealized Losses | 2 | 85
Available for Sale, Less than 12 Months, Estimated Fair Value | 49,657 |
Available for Sale, Less than 12 Months, Unrealized Losses | 290 |
Available for Sale, More than 12 Months, Estimated Fair Value | 44,458 |
Available for Sale, More than 12 Months, Unrealized Losses | 490 |
Available for Sale, Total Estimated Fair Value | 94,115 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 780 | 6,547
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Gross Unrealized Losses | 0 | 552
Available for Sale, Less than 12 Months, Estimated Fair Value | 41,619 |
Available for Sale, Less than 12 Months, Unrealized Losses | 413 |
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 | 41,619 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 413 | 72,690
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 1,499 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Held to Maturity, Total Estimated Fair Value | 1,499 |
Held-to-maturity Securities, Gross Unrealized Losses | 1 | 0
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 0 | 0
US Treasury Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Available for Sale, Less than 12 Months, Estimated Fair Value | 0 |
Available for Sale, Less than 12 Months, Unrealized Losses | 0 |
Available for Sale, More than 12 Months, Estimated Fair Value | 1,722,158 |
Available for Sale, More than 12 Months, Unrealized Losses | 1,731 |
Available for Sale, Total Estimated Fair Value | 1,722,158 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | $ 1,731 | $ 29,500

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