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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Jun. 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 | $ 37,489 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 512 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 154,689 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,185 |
Held to Maturity, Total Estimated Fair Value | 192,178 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,697 | $ 6,166
Available for Sale, Less than 12 Months, Estimated Fair Value | 10,479 |
Available for Sale, Less than 12 Months, Unrealized Losses | 10 |
Available for Sale, More than 12 Months, Estimated Fair Value | 16,844 |
Available for Sale, More than 12 Months, Unrealized Losses | 110 |
Available for Sale, Total Estimated Fair Value | 27,323 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 120 | 10,700
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 0 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 |
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 | 0 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 4
Available for Sale, Less than 12 Months, Estimated Fair Value | 139 |
Available for Sale, Less than 12 Months, Unrealized Losses | 3 |
Available for Sale, More than 12 Months, Estimated Fair Value | 16,844 |
Available for Sale, More than 12 Months, Unrealized Losses | 110 |
Available for Sale, Total Estimated Fair Value | 16,983 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 113 | 734
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 37,489 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 512 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 154,689 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,185 |
Held to Maturity, Total Estimated Fair Value | 192,178 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,697 | 6,149
Available for Sale, Less than 12 Months, Estimated Fair Value | 10,340 |
Available for Sale, Less than 12 Months, Unrealized Losses | 7 |
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 | 10,340 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 7 | $ 1,459

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