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Net Income per Common Share (Details) (USD $)
In Thousands, except Per 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
Earnings Per Share [Abstract]                    
Net income $ 2,063 $ 1,151 $ 2,341 $ 2,635 $ 2,559 $ 2,856 $ 2,842 $ 2,269 $ 8,190 $ 10,526
Weighted average common shares outstanding — basic                 7,104 6,954
Effect of dilutive securities (in shares)                 275 346
Weighted average common and potentially issuable common shares outstanding — diluted (in shares)                 7,379 7,300
Basic net income per common share (USD per share) $ 0.29 $ 0.16 $ 0.33 $ 0.37 $ 0.36 $ 0.41 $ 0.41 $ 0.33 $ 1.15 $ 1.51
Diluted net income per common share (USD per share) $ 0.28 $ 0.16 $ 0.32 $ 0.36 $ 0.35 $ 0.39 $ 0.39 $ 0.31 $ 1.11 $ 1.44
Antidilutive securities excluded from earnings per share (in shares)                   23