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Stock-Based Compensation (Summary Of Stock Units Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Performance Stock Units [Member]    
Number of Shares    
Outstanding, beginning 17,895 10,444
Granted 9,207 8,340
Vested  
Forfeited 2,753 889
Outstanding, ending 24,349 17,895
Weighted Average Grant Date Fair Value    
Outstanding, beginning $ 25.77 $ 23.86
Granted $ 32.20 $ 27.96
Vested
Forfeited $ 30.00 $ 23.76
Outstanding, ending $ 27.72 $ 25.77
Restricted Stock Units [Member]    
Number of Shares    
Outstanding, beginning 13,178 8,386
Granted 21,755 8,266
Vested 6,040 2,878
Forfeited 3,501 596
Outstanding, ending 25,392 13,178
Weighted Average Grant Date Fair Value    
Outstanding, beginning $ 26.42 $ 23.83
Granted 32.66 27.95
Vested 27.43 23.80
Forfeited 30.58 23.76
Outstanding, ending $ 30.95 $ 26.42