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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Match Funded Advances [Roll Forward]    
Beginning balance $ 1,706,768  
Ending balance 1,720,897  
Residential Mortgage [Member]    
Match Funded Advances [Roll Forward]    
Beginning balance 1,706,768 $ 2,409,442
New advances (collections of pledged advances), net 14,129 (156,475)
Ending balance $ 1,720,897 $ 2,252,967