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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 3,084 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 186,220 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,808 |
Held to Maturity, Total Estimated Fair Value | 189,304 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,809 | $ 6,166
Available for Sale, Less than 12 Months, Estimated Fair Value | 573,705 |
Available for Sale, Less than 12 Months, Unrealized Losses | 5,822 |
Available for Sale, More than 12 Months, Estimated Fair Value | 7,050 |
Available for Sale, More than 12 Months, Unrealized Losses | 44 |
Available for Sale, Total Estimated Fair Value | 580,755 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,866 | 10,700
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 4
Available for Sale, Less than 12 Months, Estimated Fair Value | 8,539 |
Available for Sale, Less than 12 Months, Unrealized Losses | 28 |
Available for Sale, More than 12 Months, Estimated Fair Value | 7,050 |
Available for Sale, More than 12 Months, Unrealized Losses | 44 |
Available for Sale, Total Estimated Fair Value | 15,589 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 72 | 734
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 3,084 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 186,220 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,808 |
Held to Maturity, Total Estimated Fair Value | 189,304 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,809 | 6,149
Available for Sale, Less than 12 Months, Estimated Fair Value | 565,166 |
Available for Sale, Less than 12 Months, Unrealized Losses | 5,794 |
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 | 565,166 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 5,794 | $ 1,459

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