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Securities Sold Under Agreements To Repurchase (Tables)
 12 Months Ended
Dec. 31, 2011
Securities Sold Under Agreements To Repurchase [Abstract]  
Securities Sold Under Agreements To Repurchase
(dollars in thousands)                           
     Repurchase
Amount		      Weighted
Average
Interest
Rate		     Carrying
Value of
Underlying
Assets		      Market
Value of
Underlying
Assets		  

December 31, 2011

    $ 124,605         0.35 %    $ 129,810       $ 129,810   

December 31, 2010

    $ 73,759         0.66 %    $ 75,305       $ 75,305