| **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** | Jun. 30, 2016 | Dec. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | $ 4,007       | $ 90,954      |
| 12 Months or Longer                                                                                                                                                                                            | 1,053         | 2,101         |
| Total                                                                                                                                                                                                          | 5,060         | 93,055        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 15            | 505           |
| 12 Months or Longer                                                                                                                                                                                            | 5             | 73            |
| Total                                                                                                                                                                                                          | 20            | 578           |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 4,995         | 69,641        |
| 12 Months or Longer                                                                                                                                                                                            |               | 14,888        |
| Total                                                                                                                                                                                                          | 4,995         | 84,529        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 5             | 519           |
| 12 Months or Longer                                                                                                                                                                                            |               | 283           |
| Total                                                                                                                                                                                                          | 5             | 802           |
| **Available-for-sale Securities and Held-to-maturity Securities [Abstract]**                                                                                                                                   |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 9,002         | 160,595       |
| 12 Months or Longer, Fair Value                                                                                                                                                                                | 1,053         | 16,989        |
| Total, Fair Value                                                                                                                                                                                              | 10,055        | 177,584       |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 20            | 1,024         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   | 5             | 356           |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 25            | 1,380         |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            |          | 7,558         |
| 12 Months or Longer                                                                                                                                                                                            |          |               |
| Total                                                                                                                                                                                                          |          | 7,558         |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            |          | 60            |
| 12 Months or Longer                                                                                                                                                                                            |          |               |
| Total                                                                                                                                                                                                          |          | 60            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 4,007         | 83,396        |
| 12 Months or Longer                                                                                                                                                                                            | 1,053         | 2,101         |
| Total                                                                                                                                                                                                          | 5,060         | 85,497        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 15            | 445           |
| 12 Months or Longer                                                                                                                                                                                            | 5             | 73            |
| Total                                                                                                                                                                                                          | 20            | 518           |
| Federal agencies                                                                                                                                                                                               |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 4,995         |          |
| 12 Months or Longer                                                                                                                                                                                            |               |          |
| Total                                                                                                                                                                                                          | 4,995         |          |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 5             |          |
| 12 Months or Longer                                                                                                                                                                                            |               |          |
| Total                                                                                                                                                                                                          | $ 5           |          |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            |          |               |
| 12 Months or Longer                                                                                                                                                                                            |          | 1,982         |
| Total                                                                                                                                                                                                          |          | 1,982         |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            |          |               |
| 12 Months or Longer                                                                                                                                                                                            |          | 15            |
| Total                                                                                                                                                                                                          |          | 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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