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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]      
Issuance of restricted stock, stock incentive plan, shares 13,699 10,963 9,291
Stock options exercised, shares 3,872 0 0
Issuance of common stock, dividend investment plan, shares 30,627 31,887 38,703
Issuance of common stock, employee benefit plan, shares 8,560 6,180 5,184
Retired common stock, shares     15,663
Dividends declared, per share (in USD per share) $ 0.76 $ 0.73 $ 0.72