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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 0.27	$ 0.24
Acquisition of treasury stock, shares	15,163	2,605
Treasury shares issued under employee stock purchase plan, shares	150	200
Treasury shares issued under dividend reinvestment plan, shares	10,150	5,911
Common stock issued under incentive stock option plans, shares	6,982	6,518

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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 as a result of an employee stock purchase plan.

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

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