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Retirement Benefit Plans (Changes In Benefit Obligations, Changes In Plan Assets And The Funded Status Of The Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in Benefit Obligation      
Service cost $ 72 $ 71 $ 64
Interest cost 128 125 149
Supplemental Executive Retirement Plans [Member]      
Change in Benefit Obligation      
Benefit obligation at beginning of year 3,811 3,969  
Service cost 72 71  
Interest cost 128 125  
Actuarial (gain) loss on supplemental retirement plans (50) (63)  
Benefits and expenses paid (291) (291)  
Benefit obligation at end of year 3,670 3,811 3,969
Change in plan assets      
Fair value of plan assets at beginning of year  
Benefits and expenses paid (291) (291)  
Contributions 291 291  
Fair value of plan assets at end of year
Funded status at end of year $ (3,720) $ (3,874)