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Net Income per Common Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net income     $ 4,350,000 $ 7,235,000
Weighted average common shares outstanding — basic 7,617,000 7,578,000 7,602,000 7,570,000
Effect of dilutive securities $ 56,000 $ 59,000 $ 38,000 $ 52,000
Weighted average common and potentially issuable common shares outstanding — diluted 7,673,000 7,637,000 7,640,000 7,622,000
Basic net income per common share (USD per share) $ 0.19 $ 0.53 $ 0.57 $ 0.96
Diluted net income per common share (USD per share) $ 0.19 $ 0.53 $ 0.57 $ 0.95