| **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** | Mar. 31, 2016 | Dec. 31, 2015 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | $ 9,506       | $ 90,954      |
| 12 Months or Longer                                                                                                                                                                                            | 5,042         | 2,101         |
| Total                                                                                                                                                                                                          | 14,548        | 93,055        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 103           | 505           |
| 12 Months or Longer                                                                                                                                                                                            | 44            | 73            |
| Total                                                                                                                                                                                                          | 147           | 578           |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 3,179         | 69,641        |
| 12 Months or Longer                                                                                                                                                                                            | 5,457         | 14,888        |
| Total                                                                                                                                                                                                          | 8,636         | 84,529        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 48            | 519           |
| 12 Months or Longer                                                                                                                                                                                            | 26            | 283           |
| Total                                                                                                                                                                                                          | 74            | 802           |
| **Available-for-sale Securities and Held-to-maturity Securities [Abstract]**                                                                                                                                   |          |          |
| Less than 12 Months, Fair Value                                                                                                                                                                                | 12,685        | 160,595       |
| 12 Months or Longer, Fair Value                                                                                                                                                                                | 10,499        | 16,989        |
| Total, Fair Value                                                                                                                                                                                              | 23,184        | 177,584       |
| Less than 12 Months, Gross Unrealized Losses                                                                                                                                                                   | 151           | 1,024         |
| 12 Months or Longer, Gross Unrealized Losses                                                                                                                                                                   | 70            | 356           |
| Total, Gross Unrealized Losses                                                                                                                                                                                 | 221           | 1,380         |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 8,375         | $ 7,558       |
| 12 Months or Longer                                                                                                                                                                                            | 1,197         |               |
| Total                                                                                                                                                                                                          | 9,572         | $ 7,558       |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 98            | $ 60          |
| 12 Months or Longer                                                                                                                                                                                            | 9             |               |
| Total                                                                                                                                                                                                          | 107           | $ 60          |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 1,131         | 83,396        |
| 12 Months or Longer                                                                                                                                                                                            | 3,845         | 2,101         |
| Total                                                                                                                                                                                                          | 4,976         | 85,497        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 5             | 445           |
| 12 Months or Longer                                                                                                                                                                                            | 35            | 73            |
| Total                                                                                                                                                                                                          | 40            | $ 518         |
| State and municipal                                                                                                                                                                                            |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            | 3,179         |               |
| 12 Months or Longer                                                                                                                                                                                            | 673           | $ 1,982       |
| Total                                                                                                                                                                                                          | 3,852         | $ 1,982       |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            | 48            |               |
| 12 Months or Longer                                                                                                                                                                                            | 1             | $ 15          |
| Total                                                                                                                                                                                                          | $ 49          | 15            |
| U.S. Government-sponsored mortgage-backed securities                                                                                                                                                           |          |          |
| **Fair Value**                                                                                                                                                                                                 |          |          |
| Less than 12 Months                                                                                                                                                                                            |               | 69,641        |
| 12 Months or Longer                                                                                                                                                                                            | $ 4,784       | 12,906        |
| Total                                                                                                                                                                                                          | $ 4,784       | 82,547        |
| **Gross Unrealized Losses**                                                                                                                                                                                    |          |          |
| Less than 12 Months                                                                                                                                                                                            |               | 519           |
| 12 Months or Longer                                                                                                                                                                                            | $ 25          | 268           |
| Total                                                                                                                                                                                                          | $ 25          | $ 787         |

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