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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Dividend reinvestment plan, shares | 22,916 | 22,697
Stock purchase and compensation plans, shares | 540,322 | 453,409
Dividends to stockholders, per share | $ 0.13 | $ 0.13
Acquisition of treasury stock, shares | 168,614 | 135,095
Preferred stock, par or stated value per share | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 | 0
Series A Preferred Stock [Member] |  |
Preferred stock, par or stated value per share | $ 0 | $ 0
Preferred stock, shares authorized | 300,000 | 300,000

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