Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Stockholders' Equity [Parenthetical]

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Consolidated Statements of Changes in Stockholders' Equity [Parenthetical] (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash dividends (in dollars per share) $ 0.72 $ 0.60