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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Issuance of restricted stock, stock incentive plan, shares 9,109 9,493
Issuance of common stock, dividend investment plan, shares 8,852 8,887
Issuance of common stock, employee benefit plan, shares 3,767 4,874
Repurchase and retirement of common stock, shares 5,000 14,051
Dividends declared, per share $ 0.46 $ 0.44