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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 0.30	$ 0.27	$ 0.57	$ 0.51
Acquisition of treasury stock, shares	39,600		54,763	2,605
Treasury shares issued under employee stock purchase plan, shares	2,110	2,363	2,260	2,563
Treasury shares issued under dividend reinvestment plan, shares	9,554	12,098	19,704	18,009
Common stock issued under incentive stock option plans, shares		4,150	6,982	10,668

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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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