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Share-based Compensation (Details 1) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Stock option activities of company    
Options outstanding beginning of period 144,019  
Number of Options Granted     
Issuance of common stock upon exercise of stock options, for cash, shares      
Number of Options Forfeited, cancelled or expired (6,314)  
Options outstanding end of the period 137,705 144,019
Options exercisable, end of period, Number of Options 126,197  
Options vested and expected to vest, Number of Options 136,325  
Weighted Average exercise Price, Options Outstanding, Beginning of period $ 18.28  
Weighted average exercise price, Granted     
Weighted average exercise price, Exercised     
Weighted average exercise price, Forfeited, cancelled or expired $ 23.35  
Weighted Average exercise Price, Options Outstanding, end of period $ 18.05 $ 18.28
Weighted average exercise price, Options exercisable, end of period $ 18.38  
Weighted Average exercise Price, Options vested and expected to vest, end of period $ 18.08  
Weighted Average Remaining Contractual Term (in years) Options Outstanding 4 years 6 months 4 years 10 months 28 days
Options exercisable at June 30, 2013, Weighted Average Remaining Contractual Term (in years) 4 years 3 months 11 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years) 4 years 5 months 27 days