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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Issuance of restricted stock, stock incentive plan, shares 14,493 13,196 14,363
Issuance of common stock, dividend investment plan, shares 13,769 23,180 32,340
Issuance of common stock, employee benefit plan, shares 5,958 3,326 8,030
Stock Repurchased During Period, Shares 52,936 89,607 0
Dividends declared, per share (in USD per share) $ 0.88 $ 0.82 $ 0.8