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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Issuance of restricted stock, stock incentive plan, shares 9,493 8,196
Issuance of common stock, dividend investment plan, shares 11,157 21,765
Issuance of common stock, employee benefit plan, shares 5,145 2,420
Repurchase and retirement of common stock, shares 42,108 69,104
Dividends declared, per share $ 0.66 $ 0.6