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Computation of Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Computation of earnings per common share |
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Average number of common shares outstanding for basic calculation | 7,912,374 |  |  | 7,841,822 |  |  | 7,887,961 |  |  | 7,834,523 |
Average potential effect of common shares in the Directors Plan (1) | 173,222 |  |  | 190,528 |  |  | 186,174 |  |  | 191,028 |
Average number of common shares outstanding used to calculate diluted earnings per common share | 8,085,596 |  |  | 8,032,350 |  |  | 8,074,135 |  |  | 8,025,551 |
Net income | $ | 3,333 |  |  | $ | 3,844 |  |  | $ | 6,795 |  |  | $ | 6,980 |
Earnings per common share |  |  |  |  |  |  |
Basic | $ | 0.42 |  |  | $ | 0.49 |  |  | $ | 0.86 |  |  | $ | 0.89 |
Diluted | $ | 0.41 |  |  | $ | 0.48 |  |  | $ | 0.84 |  |  | $ | 0.87 |
(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://fasb.org/us-gaap/role/ref/legacyRef -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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