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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 1.05	$ 0.93	$ 0.82
Acquisition of treasury stock, shares	2,605		34,048
Treasury shares issued under employee stock purchase plan, shares	3,257	6,827	907
Treasury shares issued under dividend reinvestment plan, shares	41,053	30,375	45,068
Common stock issued under dividend reinvestment plan, shares			25,230
Common stock issued under incentive stock option plans, shares	12,268	750	3,800

X

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of share options (or share units) exercised during the current period.

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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