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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2011
Shareholders' Equity. |
Summary of shares granted and vested |
|  | 2011 |  | 2010 |  | 2009 |
--- | --- | --- | --- | --- | --- | --- | ---
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value |
Unvested shares, beginning of year |  |  | 93,432 |  | $ | 22.31 |  |  | 74,062 |  | $ | 23.20 |  |  | 44,877 |  | $ | 27.10 |
Shares granted |  |  | 77,300 |  |  | 24.20 |  |  | 63,900 |  |  | 22.89 |  |  | 63,700 |  |  | 19.27 |
Shares vested |  |  | (56,622 | ) |  | 23.76 |  |  | (44,530 | ) |  | 22.63 |  |  | (34,515 | ) |  | 18.06 |
Unvested shares, end of year |  |  | 114,110 |  |  | 22.70 |  |  | 93,432 |  |  | 22.31 |  |  | 74,062 |  |  | 23.20 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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