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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                              
Total interest and dividend income $ 7,323 $ 7,458 $ 7,004 $ 6,566 $ 6,443 $ 6,279 $ 6,642 $ 6,421 $ 6,169 $ 6,265 $ 6,121 $ 5,938 $ 28,351 $ 25,785 $ 24,493
Net interest income after (recovery of) loan losses 6,838 7,109 6,985 6,890 6,364 6,162 6,345 6,035 6,117 6,354 5,494 5,408 27,822 24,906 23,373
Noninterest income 1,892 1,617 1,598 1,673 1,609 1,687 1,738 1,635 1,335 3,830 1,644 1,629 6,780 6,669 8,438
Noninterest expenses 5,823 5,909 5,747 5,711 5,395 5,871 5,832 5,554 5,774 5,518 6,131 5,058 23,190 22,652 22,481
Income before income taxes 2,907 2,817 2,836 2,852 2,578 1,978 2,251 2,116 1,678 4,666 1,007 1,979 11,412 8,923 9,330
Net income $ 1,710 $ 2,007 $ 2,027 $ 2,042 $ 1,805 $ 1,430 $ 1,610 $ 1,525 $ 1,355 $ 3,289 $ 798 $ 1,455 $ 7,786 $ 6,370 $ 6,897
Net income per common share, basic (in US dollars per share) $ 0.49 $ 0.58 $ 0.58 $ 0.59 $ 0.52 $ 0.40 $ 0.46 $ 0.43 $ 0.38 $ 0.94 $ 0.23 $ 0.42 $ 2.24 $ 1.81 $ 1.97
Net income per common share, diluted (in US dollars per share) 0.49 0.58 0.58 0.59 0.52 0.40 0.46 0.43 0.38 0.94 0.23 0.42 2.24 1.81 1.97
Dividends per common share (in USD per share) $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.88 $ 0.82 $ 0.8