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Net Income per Common Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 4,039,000 $ 2,520,000 $ 7,235,000 $ 4,640,000
Weighted average common shares outstanding — basic 7,578,000 7,519,000 7,570,000 7,467,000
Effect of dilutive securities $ 59,000 $ 97,000 $ 52,000 $ 75,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,637,000 7,616,000 7,622,000 7,542,000
Basic net income per common share (USD per share) $ 0.53 $ 0.34 $ 0.96 $ 0.62
Diluted net income per common share (USD per share) $ 0.53 $ 0.33 $ 0.95 $ 0.62