Employee Benefit Plans (Restricted Shares Activity And Related Information) (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restricted Awards Activity
Beginning Balance (in shares)	146,755	158,554
Granted (in shares)	19,034	20,536
Vested (in shares)	(25,330)	(36,685)
Ending Balance (in shares)	140,459	142,405
Average Market Price at Grant
Outstanding at period start (in dollars per share)	$ 72.16	$ 67.40
Granted (in dollars per share)	75.69	70.66
Vested (in dollars per share)	78.77	66.32
Outstanding at period end (in dollars per share)	$ 71.75	$ 67.88
Stock-based compensation expense associated with restricted shares	$ 662	$ 783
Unrecognized stock-based compensation expense associated with restricted shares	$ 5,280
Weighted average period (in years) in which the above amount is expected to be recognized	2 years 10 months 24 days