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Common Stock and Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] | The table below shows activity in the outstanding shares of the Company’s common stock during 2012.
|  | 2012
Shares outstanding at January 1 |  | 10,357,930
10% stock dividend issued December 14, 2012 |  | 1,040,984
Issuance of common stock: |  |
Issued under stock-based compensation plan |  | 28,370
Stock options/SARs exercised |  | 36,547
Shares outstanding at December 31 |  | 11,463,831
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The calculations of basic and diluted earnings per share are as follows:
|  | December 31,
(In thousands except share and per share data) |  | 2012 |  | 2011 |  | 2010
Basic |  |  |  |  |  |  |  |  |
Net income |  | $ | 23,303 |  | $ | 23,009 |  | $ | 20,310
Weighted-average common shares outstanding |  |  | 11,378,216 |  |  | 11,326,968 |  |  | 11,295,693
Basic earnings per share |  | $ | 2.05 |  | $ | 2.03 |  | $ | 1.80
Diluted |  |  |  |  |  |  |  |  |
Net income |  | $ | 23,303 |  | $ | 23,009 |  | $ | 20,310
Weighted-average common shares outstanding |  |  | 11,378,216 |  |  | 11,326,968 |  |  | 11,295,693
Effect of dilutive restricted stock, stock |  |  |  |  |  |  |  |  |
options and SARs |  |  | 178,998 |  |  | 148,652 |  |  | 135,873
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  |
assuming dilution |  |  |  |  |  |  |  |  |
|  |  | 11,557,214 |  |  | 11,475,620 |  |  | 11,431,566
Diluted earnings per share |  | $ | 2.02 |  | $ | 2.01 |  | $ | 1.78

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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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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