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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill and Intangible Assets [Abstract]  
Summary of amortizable intangible assets
                             
    For the Year Ended December 31,  
    2011   2010  
    Gross
Carrying
Amount
    Accumulated
Amortization
  Gross
Carrying
Amount
    Accumulated
Amortization
 
    (Dollars in thousands)  

Amortizing intangible assets

  $ 31,999     $(26,451)   $ 31,999     $ (22,970

Aggregate Amortization Expense:

                           

For year ended December 31,

  $ 3,481         $ 3,732          

Estimated Amortization Expense:

                           

For the year ended December 31,

                           

For the year ended 2012

  $ 2,159                      

For the year ended 2013

    1,127                      

For the year ended 2014

    475                      

For the year ended 2015

    437                      

For the year ended 2016

    395                      

Thereafter

    955