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Earnings Per Share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income $ 7,741,000 $ 9,462,000 $ 14,013,000 $ 16,422,000
Less: Net income allocated to participating securities (54,000) (94,000) (116,000) (154,000)
Net income available to common shareholders 7,687,000 9,368,000 13,897,000 16,268,000
Denominator:        
Weighted average common shares outstanding 21,115,000 20,785,000 21,108,000 20,723,000
Weighted average dilutive securities (in shares) 516,000 612,000 492,000 660,000
Weighted average common shares outstanding, diluted 21,631,000 21,397,000 21,600,000 21,383,000
Earnings per share        
Income per common share, basic (in dollars per share) $ 0.36 $ 0.45 $ 0.66 $ 0.79
Income per common share, diluted (in dollars per share) $ 0.36 $ 0.44 $ 0.64 $ 0.76
Share Repurchase Program        
Number of shares repurchased     30,600  
Weighted-average price (in dollars per share)     $ 24.54  
Authorized amount of stock to be repurchased     25,000,000  
Total cost recorded as reduction of additional paid-in capital under Repurchase Program     800,000  
Shares available for further repurchases     $ 24,200,000  
Stock options
        
Earnings Per Share        
Shares of common stock excluded from the calculation of dilutive securities 104,000 221,000 104,000 221,000
Performance awards
        
Earnings Per Share        
Shares of common stock excluded from the calculation of dilutive securities 85,000   85,000