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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Shares issued using employee stock purchase plan | 532 | 637
Shares issued using stock option exercises |  | 2,900
Cash dividends per share | $ 0.10 | $ 0.00
Common Stock |  |
Shares issued using employee stock purchase plan | 532 | 637
Shares issued using stock option exercises |  | 2,900
Shares issued using dividend reinvestment plan | 929 |
Cash dividends per share | $ 0.10 |

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