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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]                    
Net income $ 1,636 $ 1,960 $ 1,589 $ 1,681 $ 2,063 $ 1,151 $ 2,341 $ 2,635 $ 6,866 $ 8,190
Weighted average common shares outstanding — basic                 7,220 7,104
Effect of dilutive securities (in shares)                 215 275
Weighted average common and potentially issuable common shares outstanding — diluted (in shares)                 7,435 7,379
Basic net income per common share (USD per share) $ 0.22 $ 0.27 $ 0.22 $ 0.24 $ 0.29 $ 0.16 $ 0.33 $ 0.37 $ 0.95 $ 1.15
Diluted net income per common share (USD per share) $ 0.22 $ 0.26 $ 0.21 $ 0.23 $ 0.28 $ 0.16 $ 0.32 $ 0.36 $ 0.92 $ 1.11