| **Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)In Thousands, except Per Share data, unless otherwise specified** | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 |
|------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Assets**                                                                                                                         |          |          |          |
| Securities to be held to maturity                                                                                                  | $ 195,550     | $ 158,336     | $ 174,790     |
| **Shareholders' equity**                                                                                                           |          |          |          |
| Common stock, par value per share (usd per share)                                                                                  | $ 0.01        | $ 0.01        | $ 0.01        |

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