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
Statement Of Stockholders Equity [Abstract]
Issuance of restricted stock, stock incentive plan, shares	3,305		9,933	2,400		10,000
Issuance of common stock, dividend investment plan, shares	5,085		3,514	2,808	5,708	3,685
Issuance of common stock, employee benefit plan, shares	3,710	2,761			4,064
Repurchase and retirement of common stock, shares	12,374		38,614		43,555	1,500
Dividends declared, per share	$ 0.26	$ 0.26	$ 0.26	$ 0.25	$ 0.25	$ 0.24