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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Dividend reinvestment plan, shares			74,777	81,471
Stock purchase and compensation plans, shares			607,059	284,793
Dividends to stockholders, per share	$ 0.13	$ 0.13	$ 0.39	$ 0.39
Acquisition of treasury stock, shares			137,667	98,419
Preferred stock, par or stated value per share	$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	0	0	0	0
Series A Preferred Stock [Member]
Preferred stock, par or stated value per share	$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized	300,000	300,000	300,000	300,000

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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