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Long Term Subordinated Notes (Tables)
12 Months Ended
Dec. 31, 2011
Long Term Subordinated Notes [Abstract]  
Outstanding Fixed To Floating Rate Long Term Subordinated Notes
         
Maturity Date
 
December 31, 2011
 
December 31, 2010
     
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
  $ 238,354     $ 210,195     $ 238,351     $ 227,825  
Interest Expense Incurred In Connection With Long Term Subordinated Notes
   
Years Ended December 31,
 
(Dollars in thousands)
 
2011
   
2010
   
2009
 
Interest expense incurred
  $ 15,748     $ 15,748     $ 18,322