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Quarterly Condensed Statements of Income (Schedule of Quarterly Condensed Statements of Income) (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
Quarterly Financial Information Disclosure [Abstract]                      
Total interest and dividend income $ 6,443 $ 6,279 $ 6,642 $ 6,421 $ 6,169 $ 6,265 $ 6,121 $ 5,938 $ 25,785 $ 24,493 $ 24,850
Net interest income after provision for loan losses 6,364 6,162 6,345 6,035 6,117 6,354 5,494 5,408 24,906 23,373 22,588
Noninterest income 1,609 1,687 1,738 1,635 1,335 3,830 1,644 1,629 6,669 8,438 6,606
Noninterest expenses 5,395 5,871 5,832 5,554 5,774 5,518 6,131 5,058 22,652 22,481 19,986
Income before income taxes 2,578 1,978 2,251 2,116 1,678 4,666 1,007 1,979 8,923 9,330 9,208
Net income $ 1,805 $ 1,430 $ 1,610 $ 1,525 $ 1,355 $ 3,289 $ 798 $ 1,455 $ 6,370 $ 6,897 $ 7,140
Net income per common share, basic (in US dollars per share) $ 0.52 $ 0.40 $ 0.46 $ 0.43 $ 0.38 $ 0.94 $ 0.23 $ 0.42 $ 1.81 $ 1.97 $ 2.08
Net income per common share, diluted (in US dollars per share) 0.52 0.40 0.46 0.43 0.38 0.94 0.23 0.42 1.81 1.97 2.08
Dividends per common share (in USD per share) $ 0.22 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.82 $ 0.8 $ 0.77