Other Benefit Plans (Schedule of Directors Stock Purchase Plan) (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract]
DSPP shares purchased	8,121	5,232	4,296
Average purchase price per share	$ 19.217	$ 25.852	$ 28.940

Share based compensation arrangement by share based payment award to non-employee directors, per share weighted average price of shares purchased.

No definition available.

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Period Type:	instant