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Computation of Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation of earnings per common share |
| Three Months Ended March 31
| 2018 |  | 2017
Average number of common shares outstanding for basic calculation | 7,873,948 |  |  | 7,827,143 |
Average potential effect of common shares in the Directors Plan (1) | 199,270 |  |  | 191,533 |
Average number of common shares outstanding used to calculate diluted earnings per common share | 8,073,218 |  |  | 8,018,676 |
Net income | $ | 3,462 |  |  | $ | 3,136 |
Earnings per common share |  |  |
Basic | $ | 0.44 |  |  | $ | 0.40 |
Diluted | $ | 0.43 |  |  | $ | 0.39 |
(1) | Exclusive of shares held in the Rabbi Trust

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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