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Consolidated Balance Sheets (Audited) (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Assets    
Securities to be held to maturity, fair value $ 150,247,000 $ 130,677,000
Shareholders' equity    
Perferred stock, preference value per share $ 1,000 $ 1,000
Common stock, par value per share $ 1 $ 1