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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Assets      
Securities to be held to maturity, fair value $ 128,426,000 $ 110,366,000 $ 134,249,000
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