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Share Based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-Based Compensation amounts included in net income        
Total compensation expense $ 351 $ 376 $ 697 $ 705
Less: tax benefit (141) (151) (280) (283)
Share-Based Compensation amounts included in net income 210 225 417 422
Directors Stock Compensation Plan [Member]
       
Share-Based Compensation amounts included in net income        
Total compensation expense 111 102 222 185
Performance Incentive Plan [Member]
       
Share-Based Compensation amounts included in net income        
Total compensation expense $ 240 $ 274 $ 475 $ 520