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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Assets   
Securities to be held to maturity, fair value$ 137,227,000$ 110,366,000$ 126,668,000
Shareholders' equity   
Perferred stock, preference value per share$ 1,000$ 1,000$ 1,000
Common stock, par value per share$ 0.01$ 0.01$ 0.01