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Net Income per Common Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 2,484,000 $ 2,428,000 $ 9,719,000 $ 7,068,000
Weighted average common shares outstanding — basic 7,597,000 7,540,000 7,578,000 7,492,000
Effect of dilutive securities $ 28,000 $ 36,000 $ 45,000 $ 50,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,625,000 7,576,000 7,623,000 7,542,000
Basic net income per common share (USD per share) $ 0.33 $ 0.32 $ 1.28 $ 0.94
Diluted net income per common share (USD per share) $ 0.33 $ 0.32 $ 1.27 $ 0.94