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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
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest and dividend income | $ 9,027 | $ 9,084 | $ 8,750 | $ 8,593 | $ 8,323 | $ 8,131 | $ 7,994 | $ 7,475 | $ 7,323 | $ 7,458 | $ 7,004 | $ 6,566 | $ 35,454 | $ 31,923 | $ 28,351
Net interest income after (recovery of) loan losses | 7,888 | 7,835 | 7,433 | 7,430 | 6,983 | 7,286 | 7,518 | 6,844 | 6,838 | 7,109 | 6,985 | 6,890 | 30,586 | 28,631 | 27,822
Noninterest income | 1,818 | 2,219 | 1,878 | 1,844 | 1,609 | 1,804 | 1,665 | 1,801 | 1,892 | 1,617 | 1,598 | 1,673 | 7,759 | 6,879 | 6,780
Noninterest expenses | 6,310 | 7,411 | 6,824 | 6,231 | 6,089 | 7,310 | 6,166 | 5,630 | 5,823 | 5,909 | 5,747 | 5,711 | 26,776 | 25,195 | 23,190
Income before income taxes | 3,396 | 2,643 | 2,487 | 3,043 | 2,503 | 1,780 | 3,017 | 3,015 | 2,907 | 2,817 | 2,836 | 2,852 | 11,569 | 10,315 | 11,412
Net income | $ 2,831 | $ 2,231 | $ 2,126 | $ 2,571 | $ 2,081 | $ 1,860 | $ 2,521 | $ 2,539 | $ 1,710 | $ 2,007 | $ 2,027 | $ 2,042 | $ 9,759 | $ 9,001 | $ 7,786
Net income per common share, basic (in US dollars per share) | $ 0.83 | $ 0.65 | $ 0.62 | $ 0.74 | $ 0.60 | $ 0.54 | $ 0.73 | $ 0.73 | $ 0.49 | $ 0.58 | $ 0.58 | $ 0.59 | $ 2.84 | $ 2.60 | $ 2.24
Net income per common share, diluted (in US dollars per share) | 0.83 | 0.65 | 0.62 | 0.74 | 0.60 | 0.54 | 0.73 | 0.73 | 0.49 | 0.58 | 0.58 | 0.59 | 2.84 | 2.60 | 2.24
Dividends per common share (in USD per share) | $ 0.26 | $ 0.25 | $ 0.25 | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.23 | $ 0.23 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 1.0 | $ 0.94 | $ 0.88

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