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Commercial Mortgage Residual Interests (Tables)
9 Months Ended
Sep. 30, 2011
Commercial Mortgage Residual Interests [Abstract] 
Schedule Of Key Assumptions Used In Determining The Value Of The Residuals
Schedule Of Amounts Recognized As Unrealized Gains And/Or Losses Recorded As Other Comprehensive Income And Other Than Temporary Valuation Impairments Recorded In Earnings
     Quarter Ended
September 30,
     Nine Months Ended
September 30,
 
       2011        2010      2011      2010  

Unrealized gains

   $       $ 658       $ 599       $ 785   

Other than temporary valuation impairment

   $       $       $ 396       $ 3,848