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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings per share |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net income per consolidated statements of income |  | $ | 4,563 |  |  | $ | 4,067 |  |  | $ | 13,246 |  |  | $ | 11,235 |
Net earnings allocated to participating securities |  |  | (17 | ) |  |  | (12 | ) |  |  | (50 | ) |  |  | (34 | )
Net earnings allocated to common stock |  | $ | 4,546 |  |  | $ | 4,055 |  |  | $ | 13,196 |  |  | $ | 11,201 |
Basic earnings per common share computation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings allocated to common stock |  | $ | 2,045 |  |  | $ | 2,025 |  |  | $ | 6,130 |  |  | $ | 6,064 |
Undistributed earnings allocated to common stock |  |  | 2,501 |  |  |  | 2,030 |  |  |  | 7,066 |  |  |  | 5,137 |
Net earnings allocated to common stock |  | $ | 4,546 |  |  | $ | 4,055 |  |  | $ | 13,196 |  |  | $ | 11,201 |
Weighted average common shares outstanding, including shares considered participating securities |  |  | 12,448 |  |  |  | 12,315 |  |  |  | 12,430 |  |  |  | 12,290 |
Less: Average participating securities |  |  | (41 | ) |  |  | (31 | ) |  |  | (42 | ) |  |  | (35 | )
Weighted average shares |  |  | 12,407 |  |  |  | 12,284 |  |  |  | 12,388 |  |  |  | 12,255 |
Basic earnings per common share |  | $ | 0.37 |  |  | $ | 0.33 |  |  | $ | 1.07 |  |  | $ | 0.91 |
Diluted earnings per common share computation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  | $ | 4,546 |  |  | $ | 4,055 |  |  | $ | 13,196 |  |  | $ | 11,201 |
Weighted average common shares outstanding for basic earnings per common share |  |  | 12,407 |  |  |  | 12,284 |  |  |  | 12,388 |  |  |  | 12,255 |
Add: Dilutive effects of assumed exercises of stock options |  |  | 4 |  |  |  | 6 |  |  |  | 4 |  |  |  | 7 |
Weighted average shares and dilutive potential common shares |  |  | 12,411 |  |  |  | 12,290 |  |  |  | 12,392 |  |  |  | 12,262 |
Diluted earnings per common share |  | $ | 0.37 |  |  | $ | 0.33 |  |  | $ | 1.06 |  |  | $ | 0.91 |

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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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