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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest and dividend income | $ 8,323 | $ 8,131 | $ 7,994 | $ 7,475 | $ 7,323 | $ 7,458 | $ 7,004 | $ 6,566 | $ 6,443 | $ 6,279 | $ 6,642 | $ 6,421 | $ 31,923 | $ 28,351 | $ 25,785
Net interest income after (recovery of) loan losses | 6,983 | 7,286 | 7,518 | 6,844 | 6,838 | 7,109 | 6,985 | 6,890 | 6,364 | 6,162 | 6,345 | 6,035 | 28,631 | 27,822 | 24,906
Noninterest income | 1,609 | 1,804 | 1,665 | 1,801 | 1,892 | 1,617 | 1,598 | 1,673 | 1,609 | 1,687 | 1,738 | 1,635 | 6,879 | 6,780 | 6,669
Noninterest expenses | 6,089 | 7,310 | 6,166 | 5,630 | 5,823 | 5,909 | 5,747 | 5,711 | 5,395 | 5,871 | 5,832 | 5,554 | 25,195 | 23,190 | 22,652
Income before income taxes | 2,503 | 1,780 | 3,017 | 3,015 | 2,907 | 2,817 | 2,836 | 2,852 | 2,578 | 1,978 | 2,251 | 2,116 | 10,315 | 11,412 | 8,923
Net income | $ 2,081 | $ 1,860 | $ 2,521 | $ 2,539 | $ 1,710 | $ 2,007 | $ 2,027 | $ 2,042 | $ 1,805 | $ 1,430 | $ 1,610 | $ 1,525 | $ 9,001 | $ 7,786 | $ 6,370
Net income per common share, basic (in US dollars per share) | $ 0.60 | $ 0.54 | $ 0.73 | $ 0.73 | $ 0.49 | $ 0.58 | $ 0.58 | $ 0.59 | $ 0.52 | $ 0.40 | $ 0.46 | $ 0.43 | $ 2.60 | $ 2.24 | $ 1.81
Net income per common share, diluted (in US dollars per share) | 0.60 | 0.54 | 0.73 | 0.73 | 0.49 | 0.58 | 0.58 | 0.59 | 0.52 | 0.40 | 0.46 | 0.43 | 2.60 | 2.24 | 1.81
Dividends per common share (in USD per share) | $ 0.24 | $ 0.24 | $ 0.23 | $ 0.23 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.94 | $ 0.88 | $ 0.82

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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