Stock Based Compensation - Stock Options Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Option Shares [Abstract] |
|
|
| Outstanding at beginning of period (in shares) |
67,871
|
|
| Acquired in acquisition (in shares) |
0
|
|
| Granted (in shares) |
0
|
|
| Exercised (in shares) |
(4,134)
|
(22,074)
|
| Forfeited (in shares) |
0
|
|
| Expired (in shares) |
0
|
|
| Outstanding at end of period (in shares) |
63,737
|
|
| Exercisable at end of period (in shares) |
63,737
|
|
| Weighted Average Exercise Price [Abstract] |
|
|
| Outstanding at beginning of period (in dollars per share) |
$ 24.47
|
|
| Acquired in acquisition (in dollars per share) |
0.00
|
|
| Granted (in dollars per share) |
0.00
|
|
| Exercised (in dollars per share) |
24.30
|
|
| Forfeited (in dollars per share) |
0.00
|
|
| Expired (in dollars per share) |
0.00
|
|
| Outstanding at end of period (in dollars per share) |
24.48
|
|
| Exercisable at end of period (in dollars per share) |
$ 24.48
|
|
| Weighted Average Remaining Contractual Term [Abstract] |
|
|
| Outstanding at end of period |
1 year 10 months 21 days
|
|
| Exercisable at end of period |
1 year 10 months 21 days
|
|
| Aggregate Intrinsic Value [Abstract] |
|
|
| Outstanding at end of period |
$ 248
|
|
| Exercisable at end of period |
$ 248
|
|