Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends per share	$ 0.100	$ 0.160	$ 0.160	$ 0.152	$ 0.152	$ 0.152
Stock dividend, rate				5.00%
Withheld stock, in shares	180		102
Common stock dividend, shares at fair value				465,473
Repurchased stock, in shares			5,335	121,200	35,600
Issuance and reissuance of stock:
Shares under the dividend reinvestment and stock purchase plan	7,173	12,536	6,706	6,421	6,605	6,646
Shares under the employee stock option plan		1,000		5,221	4,221
Shares of stock-based compensation awards	771	(767)	6,468	679
Shares under employee stock purchase plan		11,116			6,694