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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]      
Changes in benefit obligations and plan assets for defined benefit and post retirement benefit plans, deferred income taxes $ 146 $ 141 $ 253
Change in market value of interest rate swap, deferred income taxes (140) (140) 160
Unrealized gain on available for sale securities, deferred income taxes $ 885 $ 60 $ 991
Issuance of restricted stock, stock incentive plan, shares 9,291 11,936 3,509
Issuance of common stock, dividend investment plan, shares 38,703 37,905 36,559
Issuance of common stock, employee benefit plan, shares 5,184   4,530
Retirement of common stock, shares 15,663    
Dividends declared, per share $ 0.72 $ 0.69 $ 0.68