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Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Statement of Stockholders' Equity [Abstract]      
Cash dividends per share $ 1.40 $ 1.33 $ 1.24
Number of common stock shares repurchased and returned to unissued status     5,000
Exercise of stock options and related tax benefit, shares 26,757 62,738 34,393
Effect of 10% stock dividend, shares   988,664  
Shares issued for dividend reinvestment plan, shares 61,262 71,406 15,554
Shares issued for employee stock ownership plan, shares 25,139 34,436  
Directors deferred compensation plan, shares 3,080 2,418 4,842
Shares issued for Restricted stock, shares 36,735 640 12,900
Stock issued for purchase acquisition, shares 75,188