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Stock-Based Compensation (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2010
Stock Options
Dec. 31, 2012
Stock Options
1998 Stock Option Plan
Jun. 16, 2009
Stock Options
Common Stock
1998 Stock Option Plan
Dec. 31, 2012
Stock Options
Common Stock
1998 Stock Option Plan
Dec. 31, 2008
Stock Options
Common Stock
1998 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares authorized                   750,000   550,000
Additional shares authorized                   200,000    
Award vesting period         3 years       3 years      
Award expiration period                 10 years      
Number of shares available for grant                     280,503  
Options granted in period 20,000 20,000                    
Options granted in period, weighted average exercise price (in USD per share) $ 14.89 $ 14.89                    
Weighted average grant date fair value of options granted (in USD per share)   $ 8.22 $ 10.00 $ 7.30                
Total intrinsic value of options exercised   $ 151,000 $ 127,000 $ 400,000                
Proceeds from exercise of stock options   180,000 123,000 407,000                
Share-based compensation expense           440,000 461,000 804,000        
Total income tax benefit recognized in the income statement for stock based compensation   264,000 148,000 137,000                
Unrecognized compensation cost related to stock options $ 200,000 $ 200,000                    
Unrecognized compensation cost related to stock options, weighted average period for recognition           1 year 7 months