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Net Income per Common Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                              
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 0                       0    
Net income $ 2,331,000 $ 2,484,000 $ 4,039,000 $ 3,196,000 $ 2,566,000 $ 2,428,000 $ 2,520,000 $ 2,120,000 $ 1,636,000 $ 1,960,000 $ 1,589,000 $ 1,681,000 $ 12,050,000 $ 9,634,000 $ 6,866,000
Weighted average common shares outstanding — basic                         7,583,000 7,508,000 7,220,000
Effect of dilutive securities (in shares)                         40,000 45,000 215,000
Weighted average common and potentially issuable common shares outstanding — diluted (in shares)                         7,623,000 7,553,000 7,435,000
Basic net income per common share (USD per share) $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.34 $ 0.29 $ 0.22 $ 0.27 $ 0.22 $ 0.24 $ 1.59 $ 1.28 $ 0.95
Diluted net income per common share (USD per share) $ 0.31 $ 0.33 $ 0.53 $ 0.42 $ 0.34 $ 0.32 $ 0.33 $ 0.28 $ 0.22 $ 0.26 $ 0.21 $ 0.23 $ 1.58 $ 1.28 $ 0.92