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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Assets    
Securities to be held to maturity (fair value) $ 130,677,000 $ 110,366,000
Shareholders' equity    
Preferred stock, preference value per share (in dollars per share) $ 1,000 $ 1,000
Common stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Net unrealized loss on securities available for sale, net of tax benefit 3,985,000 1,108,000
Net unrealized loss on post-retirement benefit costs, net of tax benefit $ 47,000 $ 39,000