Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 1.17	$ 1.05
Acquisition of treasury stock, shares	103,688	2,605
Treasury shares issued under employee stock purchase plan, shares	2,270
Treasury shares issued under dividend reinvestment plan, shares	36,928	3,257
Common stock issued under dividend reinvestment plan, shares		41,053
Incentive stock options exercised, shares	8,482	12,268