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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The computation of basic and diluted earnings per share is shown below (in thousands, except per share data). There were no anti-dilutive stock options for the years ended December 31, 2017, 2016, and 2015.
|  | Years Ended December 31 |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |  |
Net income per consolidated statements of income |  | $ | 23,860 |  |  | $ | 20,540 |  |  | $ | 22,197 |
Net earnings allocated to participating securities |  |  | (135 | ) |  |  | (129 | ) |  |  | (117 | )
Net earnings allocated to common stock |  | $ | 23,725 |  |  | $ | 20,411 |  |  | $ | 22,080 |
Distributed earnings allocated to common stock |  | $ | 10,030 |  |  | $ | 9,480 |  |  | $ | 9,460 |
Undistributed earnings allocated to common stock |  |  | 13,695 |  |  |  | 10,931 |  |  |  | 12,620 |
Net earnings allocated to common stock |  | $ | 23,725 |  |  | $ | 20,411 |  |  | $ | 22,080 |
Weighted average common shares outstanding, including shares considered participating securities |  |  | 15,212 |  |  |  | 14,457 |  |  |  | 14,408 |
Less: Average participating securities |  |  | (80 | ) |  |  | (82 | ) |  |  | (70 | )
Weighted average shares |  |  | 15,132 |  |  |  | 14,375 |  |  |  | 14,338 |
Basic earnings per common share |  | $ | 1.57 |  |  | $ | 1.42 |  |  | $ | 1.54 |
Diluted earnings per common share computation |  |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  | $ | 23,725 |  |  | $ | 20,411 |  |  | $ | 22,080 |
Weighted average common shares outstanding for basic earnings per common share |  |  | 15,132 |  |  |  | 14,375 |  |  |  | 14,338 |
Add: Dilutive effects of assumed exercises of stock options |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Weighted average shares and dilutive potential common shares |  |  | 15,132 |  |  |  | 14,375 |  |  |  | 14,338 |
Diluted earnings per common share |  | $ | 1.57 |  |  | $ | 1.42 |  |  | $ | 1.54 |

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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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