| **Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands** | Dec. 31, 2016 | Dec. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                              |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | $ 330,902     | $ 90,954      |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 9,674         | 505           |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 2,101         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 73            |
| Total, Fair Value                                                                                                                                                                                              | 330,902       | 93,055        |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 9,674         | 578           |
| **Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                                |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 179,395       | 69,641        |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 3,802         | 519           |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 14,888        |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 283           |
| Total, Fair Value                                                                                                                                                                                              | 179,395       | 84,529        |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 3,802         | 802           |
| **Available-for-sale Securities and Held-to-maturity Securities [Abstract]**                                                                                                                                   |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 510,297       | 160,595       |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 13,476        | 1,024         |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 16,989        |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 356           |
| Total, Fair Value                                                                                                                                                                                              | 510,297       | 177,584       |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 13,476        | 1,380         |
| State and municipal                                                                                                                                                                                            |          |          |
| **Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                              |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 126,593       | 7,558         |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 5,564         | 60            |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               |               |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               |               |
| Total, Fair Value                                                                                                                                                                                              | 126,593       | 7,558         |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 5,564         | 60            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                              |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 185,544       | 83,396        |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 3,071         | 445           |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 2,101         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 73            |
| Total, Fair Value                                                                                                                                                                                              | 185,544       | 85,497        |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 3,071         | 518           |
| Equity securities                                                                                                                                                                                              |          |          |
| **Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                              |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 18,765        |          |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 1,039         |          |
| Total, Fair Value                                                                                                                                                                                              | 18,765        |          |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 1,039         |          |
| Government Agency and Municipal Bonds and Notes                                                                                                                                                                |          |          |
| **Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                                |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 19,121        |          |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 479           |          |
| Total, Fair Value                                                                                                                                                                                              | 19,121        |          |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 479           |          |
| State and municipal                                                                                                                                                                                            |          |          |
| **Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                                |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 50,897        |               |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 1,796         |               |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 1,982         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 15            |
| Total, Fair Value                                                                                                                                                                                              | 50,897        | 1,982         |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 1,796         | 15            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]**                                                                                                                                |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 109,377       | 69,641        |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 1,527         | 519           |
| 12 Months or Longer, Fair Value                                                                                                                                                                                |               | 12,906        |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   |               | 268           |
| Total, Fair Value                                                                                                                                                                                              | 109,377       | 82,547        |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | $ 1,527       | $ 787         |

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| - Definition
Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.
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| - Definition
Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.
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