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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 0.30	$ 0.27	$ 0.87	$ 0.78
Acquisition of treasury stock, shares	48,825		103,588	2,605
Treasury shares issued under employee stock purchase plan, shares	10	381	2,270	2,944
Treasury shares issued under dividend reinvestment plan, shares	9,986	12,957	29,690	30,966
Incentive stock options exercised, shares	200	1,600	7,182	12,268

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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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