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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 295,618 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,233 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 211,796 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,225 |
Held to Maturity, Total, Estimated Fair Value | 507,414 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 8,458 | $ 9,035
Available for Sale, Less than 12 Months, Estimated Fair Value | 812,212 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,256 |
Available for Sale, More than 12 Months, Estimated Fair Value | 11,326 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 318 |
Available for Sale, Total, Estimated Fair Value | 823,538 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 9,574 |
U.S. Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Available for Sale, Less than 12 Months, Estimated Fair Value | 25,945 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 148 |
Available for Sale, More than 12 Months, Estimated Fair Value | 11,326 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 318 |
Available for Sale, Total, Estimated Fair Value | 37,271 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 466 |
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 295,618 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,233 |
Held to Maturity, More than 12 Months, Estimated Fair Value | 211,796 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,225 |
Held to Maturity, Total, Estimated Fair Value | 507,414 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 8,458 | $ 9,035
Available for Sale, Less than 12 Months, Estimated Fair Value | 786,267 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,108 |
Available for Sale, More than 12 Months, Estimated Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available for Sale, Total, Estimated Fair Value | 786,267 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 9,108 |

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