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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
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).
|  | Years Ended December 31 |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |  |
Net income per consolidated statements of income |  | $ | 17,136 |  |  | $ | 15,104 |  |  | $ | 11,316 |
Net earnings allocated to participating securities |  |  | (62 | ) |  |  | (42 | ) |  |  | (33 | )
Net earnings allocated to common stock |  | $ | 17,074 |  |  | $ | 15,062 |  |  | $ | 11,283 |
Distributed earnings allocated to common stock |  | $ | 8,182 |  |  | $ | 8,101 |  |  | $ | 6,914 |
Undistributed earnings allocated to common stock |  |  | 8,892 |  |  |  | 6,961 |  |  |  | 4,369 |
Net earnings allocated to common stock |  | $ | 17,074 |  |  | $ | 15,062 |  |  | $ | 11,283 |
Weighted average common shares outstanding, including shares considered participating securities |  |  | 12,441 |  |  |  | 12,306 |  |  |  | 10,630 |
Less: Average participating securities |  |  | (41 | ) |  |  | (33 | ) |  |  | (30 | )
Weighted average shares |  |  | 12,400 |  |  |  | 12,273 |  |  |  | 10,600 |
Basic earnings per common share |  | $ | 1.38 |  |  | $ | 1.23 |  |  | $ | 1.06 |
Diluted earnings per common share computation |  |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  | $ | 17,074 |  |  | $ | 15,062 |  |  | $ | 11,283 |
Weighted average common shares outstanding for basic earnings per common share |  |  | 12,400 |  |  |  | 12,273 |  |  |  | 10,600 |
Add: Dilutive effects of assumed exercises of stock options |  |  | 3 |  |  |  | 6 |  |  |  | 9 |
Weighted average shares and dilutive potential common shares |  |  | 12,403 |  |  |  | 12,279 |  |  |  | 10,609 |
Diluted earnings per common share |  | $ | 1.38 |  |  | $ | 1.23 |  |  | $ | 1.06 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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