Other Benefit Plans (Schedule of Directors Stock Purchase Plan) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract]
DSPP shares purchased	4,771	8,121	5,232
Average purchase price per share	$ 28.264	$ 19.217	$ 25.852