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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restricted Awards, Number of Awards [Roll Forward]
Beginning Balance (in shares)			148,083	152,692
Granted (in shares)			38,603	31,006
Vested (in shares)			(29,775)	(45,007)
Ending Balance (in shares)	156,911	138,691	156,911	138,691
Restricted Awards, Number of Awards, Weighted Average Exercise Price [Roll Forward]
Outstanding at period start (in dollars per share)			$ 62.62	$ 51.85
Granted (in dollars per share)			67.15	79.86
Vested (in dollars per share)			47.72	39.81
Outstanding at period end (in dollars per share)	$ 66.56	$ 61.98	$ 66.56	$ 61.98
Stock-based compensation expense associated with restricted shares	$ 708	$ 499	$ 2,018	$ 1,434
Unrecognized stock-based compensation expense associated with restricted shares	$ 5,592		$ 5,592
Weighted average period (in years) in which the above amount is expected to be recognized			3 years 1 month 6 days