| **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** | Sep. 30, 2016 | Dec. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | $ 32,011      | $ 90,954      |
| 12 Months or Longer                                                                                                                                                                                            | 0             | 2,101         |
| Total                                                                                                                                                                                                          | 32,011        | 93,055        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 341           | 505           |
| 12 Months or Longer                                                                                                                                                                                            | 0             | 73            |
| Total                                                                                                                                                                                                          | 341           | 578           |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 22,410        | 69,641        |
| 12 Months or Longer                                                                                                                                                                                            |               | 14,888        |
| Total                                                                                                                                                                                                          | 22,410        | 84,529        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 65            | 519           |
| 12 Months or Longer                                                                                                                                                                                            |               | 283           |
| Total                                                                                                                                                                                                          | 65            | 802           |
| **Available-for-sale Securities and Held-to-maturity Securities [Abstract]**                                                                                                                                   |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 54,421        | 160,595       |
| 12 Months or Longer, Fair Value                                                                                                                                                                                | 0             | 16,989        |
| Total, Fair Value                                                                                                                                                                                              | 54,421        | 177,584       |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 406           | 1,024         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   | 0             | 356           |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 406           | 1,380         |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 22,468        | 7,558         |
| 12 Months or Longer                                                                                                                                                                                            |               |               |
| Total                                                                                                                                                                                                          | 22,468        | 7,558         |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 324           | 60            |
| 12 Months or Longer                                                                                                                                                                                            |               |               |
| Total                                                                                                                                                                                                          | 324           | 60            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 9,543         | 83,396        |
| 12 Months or Longer                                                                                                                                                                                            |               | 2,101         |
| Total                                                                                                                                                                                                          | 9,543         | 85,497        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 17            | 445           |
| 12 Months or Longer                                                                                                                                                                                            |               | 73            |
| Total                                                                                                                                                                                                          | 17            | 518           |
| Federal agencies                                                                                                                                                                                               |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 15,469        |          |
| 12 Months or Longer                                                                                                                                                                                            |               |          |
| Total                                                                                                                                                                                                          | 15,469        |          |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 51            |          |
| 12 Months or Longer                                                                                                                                                                                            |               |          |
| Total                                                                                                                                                                                                          | 51            |          |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 6,941         |               |
| 12 Months or Longer                                                                                                                                                                                            |               | 1,982         |
| Total                                                                                                                                                                                                          | 6,941         | 1,982         |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 14            |               |
| 12 Months or Longer                                                                                                                                                                                            |               | 15            |
| Total                                                                                                                                                                                                          | $ 14          | 15            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            |          | 69,641        |
| 12 Months or Longer                                                                                                                                                                                            |          | 12,906        |
| Total                                                                                                                                                                                                          |          | 82,547        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            |          | 519           |
| 12 Months or Longer                                                                                                                                                                                            |          | 268           |
| Total                                                                                                                                                                                                          |          | $ 787         |

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