Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Details)

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Employee Stock Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Restricted Stock Awards
      
Shares      
Unvested at the beginning of the period (in shares)   235,667  
Granted (in shares)   42,077  
Vested (in shares)   (68,921)  
Unvested at the end of the period (in shares) 208,823 208,823 235,667
Expected to vest in the future, at the end of the period (in shares) 201,305 201,305  
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share)   $ 12.27  
Granted (in dollars per share)   $ 14.57  
Vested (in dollars per share)   $ 12.61  
Unvested at the end of the period (in dollars per share) $ 12.63 $ 12.63 $ 12.27
Expected to vest in the future, at the end of the period (in dollars per share) $ 12.63 $ 12.63  
Weighted Average Remaining Contractual Term      
Unvested at the beginning of the period (in years)   2 years 2 months 8 days 2 years 9 months 29 days
Granted (in years)   2 years 3 months  
Unvested at the end of the period (in years)   2 years 2 months 8 days 2 years 9 months 29 days
Expected to vest in future, at the end of the period (in years)   2 years 2 months 8 days  
Recognized and unrecognized compensation expense with weighted average recognition period      
Compensation expenses recognized $ 265 $ 827  
Unrecognized compensation expense calculated under the fair value method for shares expected to vest 1,950 1,950  
Weighted average period over which unrecognized compensation expenses is expected to be recognized (in years)   2 years 2 months 8 days  
Unrestricted Stock
      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share)   $ 12.94  
Recognized and unrecognized compensation expense with weighted average recognition period      
Compensation expenses recognized 259 603  
Unrecognized compensation expense calculated under the fair value method for shares expected to vest $ 259 $ 259  
Restricted Stock Units
      
Shares      
Unvested at the beginning of the period (in shares)   18,893  
Granted (in shares)   14,367  
Vested (in shares)   (7,214)  
Unvested at the end of the period (in shares) 26,046 26,046 18,893
Expected to vest in the future, at the end of the period (in shares) 26,046 26,046  
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share)   $ 15.20  
Granted (in dollars per share)   $ 14.35  
Vested (in dollars per share)   $ 15.25  
Unvested at the end of the period (in dollars per share) $ 14.73 $ 14.73 $ 15.20
Expected to vest in the future, at the end of the period (in dollars per share) $ 14.73 $ 14.73  
Weighted Average Remaining Contractual Term      
Unvested at the beginning of the period (in years)   11 months 19 days 2 years
Granted (in years)   2 years 3 months  
Unvested at the end of the period (in years)   11 months 19 days 2 years
Expected to vest in future, at the end of the period (in years)   11 months 19 days  
Recognized and unrecognized compensation expense with weighted average recognition period      
Number of shares issued upon exercise of units other than options   1  
Maximum period following a termination of service in which the share-based award will be settled   2 months 15 days  
A&R 2004 Plan
      
Employee Stock Plans      
Number of shares of common stock reserved for issuance 37,240 37,240  
Expiration period   10 years  
2010 Plan
      
Employee Stock Plans      
Maximum number of shares of common stock that may be issued 2,130,000 2,130,000