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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Changes in Shareholders' Equity [Abstract] |  |  |
Common shares issued |  |  | 3,365,853
Restricted stock award grants shares | 26,900 | 17,900 | 16,500
Forfeiture of restricted stock award grants shares |  | 1,488 | 1,343
Exercise of stock options shares including tax benefit | 31,875 | 28,750 | 8,206
Reissue of treasury stock shares | 39,811 | 94,895 | 86,772
Cash dividends declared per share | $ 0.66 | $ 0.66 | $ 0.66

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