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Long Term Subordinated Notes (Tables)
 12 Months Ended
Dec. 31, 2016
Long Term Subordinated Notes [Abstract]  
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes
           
Maturity Date
  
December 31, 2016
    
December 31, 2015
  
      
Original
             
Consolidated Balance
          
Consolidated Balance
        
(Dollars in thousands)
Date Issued
  
Principal Amount
    
Scheduled
  
Final
  
Sheet Amount
    
Market Value
    
Sheet Amount
    
Market Value
  
6.6% Long term subordinated notes
04/26/2007
  
$
400,000
    
05/15/2037
  
05/01/2067
  
$
236,462
    
$
204,636
    
$
236,364
    
$
208,978
  
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes
   
Years Ended December 31,
  
(Dollars in thousands)
  
2016
    
2015
    
2014
  
Interest expense incurred
  
$
15,749
    
$
15,749
    
$
15,749