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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restricted Awards, Number of Awards [Roll Forward]        
Beginning Balance (in shares)     148,083 152,692
Granted (in shares)     37,103 31,006
Vested (in shares)     (26,450) (41,657)
Ending Balance (in shares) 158,736 142,041 158,736 142,041
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)     67.40 79.86
Vested (in dollars per share)     49.58 39.79
Outstanding at period end (in dollars per share) $ 65.91 $ 61.50 $ 65.91 $ 61.50
Stock-based compensation expense associated with restricted shares $ 681 $ 501 $ 1,310 $ 935
Unrecognized stock-based compensation expense associated with restricted shares $ 6,208   $ 6,208  
Weighted average period (in years) in which the above amount is expected to be recognized     3 years 2 months 12 days