Employee Benefit Plans (Restricted Shares Activity And Related Information) (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restricted Awards Activity
Beginning Balance (in shares)			158,554	148,083
Granted (in shares)			43,451	38,603
Vested (in shares)			(54,400)	(29,775)
Ending Balance (in shares)	147,605	156,911	147,605	156,911
Average Market Price at Grant
Outstanding at period start (in dollars per share)			$ 67.40	$ 62.62
Granted (in dollars per share)			76.37	67.15
Vested (in dollars per share)			60.69	47.72
Outstanding at period end (in dollars per share)	$ 72.23	$ 66.56	$ 72.23	$ 66.56
Stock-based compensation expense associated with restricted shares	$ 717	$ 708	$ 2,192	$ 2,018
Unrecognized stock-based compensation expense associated with restricted shares	$ 5,704		$ 5,704
Weighted average period (in years) in which the above amount is expected to be recognized			2 years 10 months 24 days