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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic                      
Net income $ 1,688 $ 1,683 $ 1,445 $ 1,274 $ 1,222 $ 1,449 $ 1,430 $ 1,642 $ 6,090 $ 5,743 $ 5,695
Weighted average common shares outstanding                 3,287,109 3,289,296 3,298,177
Basic earnings per common shares $ 0.51 $ 0.52 $ 0.43 $ 0.39 $ 0.37 $ 0.44 $ 0.44 $ 0.50 $ 1.85 $ 1.75 $ 1.73
Diluted                      
Plus dilutive stock options and restricted stock units                 4,972 7,925 12,116
Weighted average common shares outstanding and potentially dilutive shares                 3,292,081 3,297,221 3,310,293
Diluted earnings per common share $ 0.51 $ 0.52 $ 0.43 $ 0.39 $ 0.37 $ 0.44 $ 0.43 $ 0.50 $ 1.85 $ 1.74 $ 1.72