Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends per share	$ 0.160	$ 0.160	$ 0.152	$ 0.152
Withheld stock, in shares		102
Repurchased stock, in shares		5,335	35,600
Issuance and reissuance of stock:
Shares under the dividend reinvestment and stock purchase plan	12,536	6,706	6,605	6,646
Shares under the employee stock option plan	1,000		4,221
Shares of stock-based compensation awards	(767)	6,468
Shares under employee stock purchase plan	11,116		6,694