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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Basic earnings per common share:    
Net income available to common stockholders $ 9,142 $ 7,852
Weighted-average common shares outstanding 2,858,556 2,850,801
Basic earnings per common share $ 3.2 $ 2.75
Diluted earnings per common share:    
Net income available to common stockholders $ 9,142 $ 7,852
Weighted-average common shares outstanding 2,858,556 2,850,801
Weighted-average common and dilutive potential common shares outstanding 2,858,601 2,850,801
Diluted earnings per common share $ 3.2 $ 2.75