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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Mar. 31, 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 | $ 62,407 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,018 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 142,187 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,072 |
Held to Maturity, Total Estimated Fair Value | 204,594 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 5,090 | $ 6,166
Available for Sale, Less than 12 Months, Estimated Fair Value | 164,507 |
Available for Sale, Less than 12 Months, Unrealized Losses | 451 |
Available for Sale, More than 12 Months, Estimated Fair Value | 91,930 |
Available for Sale, More than 12 Months, Unrealized Losses | 641 |
Available for Sale, Total Estimated Fair Value | 256,437 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,092 | 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 | 2,352 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 |
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 | 2,352 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2 | 4
Available for Sale, Less than 12 Months, Estimated Fair Value | 227 |
Available for Sale, Less than 12 Months, Unrealized Losses | 2 |
Available for Sale, More than 12 Months, Estimated Fair Value | 24,321 |
Available for Sale, More than 12 Months, Unrealized Losses | 214 |
Available for Sale, Total Estimated Fair Value | 24,548 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 216 | 734
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 60,055 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,016 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 142,187 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,072 |
Held to Maturity, Total Estimated Fair Value | 202,242 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 5,088 | 6,149
Available for Sale, Less than 12 Months, Estimated Fair Value | 164,280 |
Available for Sale, Less than 12 Months, Unrealized Losses | 449 |
Available for Sale, More than 12 Months, Estimated Fair Value | 67,609 |
Available for Sale, More than 12 Months, Unrealized Losses | 427 |
Available for Sale, Total Estimated Fair Value | 231,889 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 876 | $ 1,459

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