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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic earnings per common share:                      
Net income available to shareholders $ (2,372) $ 1,766 $ 1,919 $ 2,101 $ 1,988 $ 1,884 $ 1,412 $ 1,998 $ 3,414 $ 7,282 $ 8,599
Basic earnings per share (in dollars per share) $ (0.41) $ 0.30 $ 0.33 $ 0.36 $ 0.34 $ 0.32 $ 0.24 $ 0.34 $ 0.59 $ 1.24 $ 1.46
Diluted earnings per common share:                      
Net income available to shareholders $ (2,372) $ 1,766 $ 1,919 $ 2,101 $ 1,988 $ 1,884 $ 1,412 $ 1,998 $ 3,414 $ 7,282 $ 8,599
Average shares outstanding (in shares)                 5,826,346 5,864,153 5,884,984
Effect of dilutive stock options (in shares)                 5,284 0 0
Average shares outstanding including dilutive stock options (in shares)                 5,831,630 5,864,153 5,884,984
Diluted earnings per share (in dollars per share) $ (0.41) $ 0.30 $ 0.33 $ 0.36 $ 0.34 $ 0.32 $ 0.24 $ 0.34 $ 0.59 $ 1.24 $ 1.46