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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Calculation of Basic Earnings Per Share |
|  | (in thousands of dollars) |  |  | (in thousands of dollars) |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2018 |  |  | September 30, 2017 |  |  | September 30, 2018 |  |  | September 30, 2017 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 3,875 |  |  | $ | 3,222 |  |  | $ | 11,756 |  |  | $ | 9,284 |
Less: distributed earnings allocated to participating securities |  |  | (13 | ) |  |  | (12 | ) |  |  | (38 | ) |  |  | (33 | )
Less: undistributed earnings allocated to participating securities |  |  | (26 | ) |  |  | (19 | ) |  |  | (80 | ) |  |  | (55 | )
Net earnings available to common shareholders |  | $ | 3,836 |  |  | $ | 3,191 |  |  | $ | 11,638 |  |  | $ | 9,196 |
Weighted average common shares outstanding including participating securities (1) |  |  | 9,274,507 |  |  |  | 9,252,919 |  |  |  | 9,268,819 |  |  |  | 9,245,514 |
Less: average unvested restricted shares (1) |  |  | (93,242 | ) |  |  | (88,596 | ) |  |  | (92,683 | ) |  |  | (87,074 | )
Weighted average common shares outstanding (1) |  |  | 9,181,265 |  |  |  | 9,164,323 |  |  |  | 9,176,136 |  |  |  | 9,158,440 |
Basic earnings and diluted per share (1) |  | $ | 0.42 |  |  | $ | 0.35 |  |  | $ | 1.27 |  |  | $ | 1.01 |

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