Equity Incentive Plans (Summary Of Exercisable Options) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Options outstanding (in shares)	95,565
Weighted avg. life remaining (in years)	3 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 57.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 162
Forty Four Point Forty Four To Forty Nine Point Nine Nine [Member]
Options outstanding (in shares)	10,132
Weighted avg. life remaining (in years)	2 years
Fifty To Fifty Nine Point Nine Nine Member
Options outstanding (in shares)	31,008
Weighted avg. life remaining (in years)	2 years 3 months 18 days
Sixty To Sixty Five Point Five Zero Member
Options outstanding (in shares)	50,754
Weighted avg. life remaining (in years)	3 years 7 months 6 days
Seventy To Seventy Six Point Six Three [Member]
Options outstanding (in shares)	3,671
Weighted avg. life remaining (in years)	5 years 8 months 12 days