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Share-Based Compensation - Textual (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2010
Stock Options [Member]
Dec. 31, 2010
2000 Plan
Nov. 15, 2010
2000 Plan
Dec. 31, 2012
2000 Plan
Stock Options [Member]
Dec. 31, 2012
2005 Plan
Dec. 31, 2010
2005 Plan
Dec. 31, 2012
2005 Plan
Stock Options [Member]
Dec. 31, 2012
Minimum
2000 Plan
Dec. 31, 2010
Minimum
2000 Plan
Dec. 31, 2012
Maximum
2000 Plan
Dec. 31, 2010
Maximum
2000 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               317,799       292,960        
Share Based Compensation Life of Option                 10 years     10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 5 years     5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                       476,000        
Common Stock, Capital Shares Reserved for Future Issuance                       181,490        
Share-based compensation expense $ 108,000 $ 196,000 $ 239,000                          
Tax benefit of stock option compensation expense       16,000 36,000 42,000                    
Options granted (in shares) 92,150           15,200     92,150 67,800          
Weighted average exercise price of options granted in period (in dollars per share) $ 8.03           $ 5.76           $ 8.02 $ 5.30 $ 8.75 $ 5.76
Weighted average grant date fair value of options granted in period $ 3.40 $ 0.00 $ 2.58                          
Intrinsic value of options exercised 93,000 417,000 349,000                          
Cash received from options exercised 385,000 680,000 550,000                          
Excess tax benefit realized for option exercises 26,000 116,000 28,000                          
Unrecognized compensation cost related to non-vested share-based compensation arrangements 374,000                              
Weighted average period to recognize unrecognized share-based compensation cost       1 year 11 months 23 days                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 140,000 $ 123,000