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Consolidated Statements of Income and Retained Earnings (Unaudited) (Parenthetical) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Income tax expense:    
Common stock, shares outstanding6,599,9126,599,9126,599,9126,599,912
Common stock dividend per share declared$ 0.03$ 0.03$ 0.09$ 0.92
Weighted average number of shares outstanding basic6,599,9126,599,9126,599,9126,599,912