Share-Based Compensation (Restricted Share Activity) (Details) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Number of Restricted Shares | |||
| Nonvested balance, beginning | 135,471 | 154,998 | 169,418 |
| Granted | 60,415 | 53,790 | 64,522 |
| Vested | (56,090) | (64,874) | (78,942) |
| Forfeited | (23,551) | (8,443) | 0 |
| Nonvested balance, ending | 116,245 | 135,471 | 154,998 |
| Weighted Average Grant-Date Fair Value | |||
| Nonvested balance, beginning | $ 20.13 | $ 16.97 | $ 11.55 |
| Granted | 22.74 | 22.52 | 22.49 |
| Vested | 18.71 | 15.23 | 9.86 |
| Forfeited | 20.90 | 15.03 | 0.00 |
| Nonvested balance, ending | $ 21.13 | $ 20.13 | $ 16.97 |