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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Jun. 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 | $ 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 | 900 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 |
Held to Maturity, Total Estimated Fair Value | 900 |
Held-to-maturity Securities, Gross Unrealized Losses | 4 | $ 637
Available for Sale, Less than 12 Months, Estimated Fair Value | 61,278 |
Available for Sale, Less than 12 Months, Unrealized Losses | 1,317 |
Available for Sale, More than 12 Months, Estimated Fair Value | 2,123,415 |
Available for Sale, More than 12 Months, Unrealized Losses | 7,901 |
Available for Sale, Total Estimated Fair Value | 2,184,693 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 9,218 | 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 | 900 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 |
Held to Maturity, Total Estimated Fair Value | 900 |
Held-to-maturity Securities, Gross Unrealized Losses | 4 | 85
Available for Sale, Less than 12 Months, Estimated Fair Value | 12,258 |
Available for Sale, Less than 12 Months, Unrealized Losses | 38 |
Available for Sale, More than 12 Months, Estimated Fair Value | 116,919 |
Available for Sale, More than 12 Months, Unrealized Losses | 1,365 |
Available for Sale, Total Estimated Fair Value | 129,177 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 1,403 | 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 | 49,020 |
Available for Sale, Less than 12 Months, Unrealized Losses | 1,279 |
Available for Sale, More than 12 Months, Estimated Fair Value | 186,554 |
Available for Sale, More than 12 Months, Unrealized Losses | 1,593 |
Available for Sale, Total Estimated Fair Value | 235,574 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | 2,872 | 72,690
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Gross Unrealized Losses | 0 | 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 | 1,819,942 |
Available for Sale, More than 12 Months, Unrealized Losses | 4,943 |
Available for Sale, Total Estimated Fair Value | 1,819,942 |
Available-for-sale Securities, Gross Unrealized Loss, before Tax | $ 4,943 | $ 29,500

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