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Commitments And Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments And Contingencies [Abstract]  
Estimated Cost To Replace All Such Annuities For Which The Company Was Contingently Liable
   
At December 31,
  
(Dollars in thousands)
  
2017
    
2016
  
The Prudential
  
$
144,618
    
$
146,507
  
Unaffiliated life insurance company
  
$
34,444
    
$
33,860