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Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Stockholders' Equity [Abstract]
Cash dividends, per share	$ 0.30	$ 0.30
Class B Common Stock [Member]
Statement of Stockholders' Equity [Abstract]
Repurchase of Class B common stock, shares	8,388

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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