Employee Benefit Plans (Restricted Shares Activity And Related Information) (Details) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restricted Awards Activity
Beginning Balance (in shares)			158,554	148,083
Granted (in shares)			38,036	37,103
Forfeited (in shares)			0	0
Vested (in shares)			(52,050)	(26,450)
Ending Balance (in shares)	144,540	158,736	144,540	158,736
Average Market Price at Grant
Outstanding at period start (in dollars per share)			$ 67.40	$ 62.62
Granted (in dollars per share)			76.65	67.40
Forfeited (in dollars per share)			0	0
Vested (in dollars per share)			61.23	49.58
Outstanding at period end (in dollars per share)	$ 71.75	$ 65.91	$ 71.75	$ 65.91
Stock-based compensation expense associated with restricted shares	$ 691	$ 681	$ 1,475	$ 1,310
Unrecognized stock-based compensation expense associated with restricted shares	$ 6,016		$ 6,016
Weighted average period (in years) in which the above amount is expected to be recognized			3 years 2 months 12 days