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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 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, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 4,904 $ 4,871 $ 4,832 $ 4,746 $ 4,803 $ 4,817 $ 4,738 $ 4,656 $ 19,352 $ 19,014 $ 19,015
Net interest income 4,670 4,625 4,579 4,490 4,526 4,535 4,449 4,353 18,362 17,863 17,596
Net income $ 1,222 $ 1,450 $ 1,431 $ 1,642 $ 1,556 $ 1,554 $ 1,337 $ 1,248 $ 5,743 $ 5,695 $ 5,094
Basic earnings per common share $ .37 $ .44 $ .43 $ .50 $ 0.48 $ 0.47 $ 0.40 $ 0.38 $ 1.75 $ 1.73 $ 1.55
Fully diluted earnings per common share $ 0.37 $ .44 $ .43 $ .49 $ 0.47 $ 0.47 $ 0.40 $ 0.38 $ 1.74 $ 1.72 $ 1.54