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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income $ 9,771 $ 8,746 $ 9,535 $ 6,210 $ 5,860 $ 4,221 $ 3,717 $ 4,500 $ 34,262 $ 18,298 $ 16,122
Less: Net income allocated to participating securities                 (282) (97)  
Net income available to common shareholders                 $ 33,980 $ 18,201 $ 16,122
Denominator:                      
Weighted average common shares outstanding                 20,391,000 20,151,000 19,883,000
Weighted average dilutive securities (in shares)                 781,000 842,000 899,000
Weighted average common shares outstanding, diluted                 21,172,000 20,993,000 20,782,000
Earnings per share                      
Income per common share, basic (in dollars per share) $ 0.47 $ 0.42 $ 0.46 $ 0.30 $ 0.29 $ 0.21 $ 0.19 $ 0.23 $ 1.67 $ 0.90 $ 0.81
Income per common share, diluted (in dollars per share) $ 0.46 $ 0.41 $ 0.45 $ 0.29 $ 0.28 $ 0.20 $ 0.18 $ 0.21 $ 1.60 $ 0.87 $ 0.78
Nonvested performance shares
                      
Earnings Per Share                      
Anti-dilutive shares excluded from the diluted earnings per share calculation                 9,718 51,879  
Employee stock options
                      
Earnings Per Share                      
Anti-dilutive shares excluded from the diluted earnings per share calculation                 229,128 89,240