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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Match Funded Advances [Roll Forward]    
Beginning balance $ 1,706,768  
Ending balance 1,534,322  
Residential Mortgage [Member]    
Match Funded Advances [Roll Forward]    
Beginning balance 1,706,768 $ 2,409,442
Sales of advances (7,757) (96,408)
Collections of pledged advances, net (164,689) (357,416)
Ending balance $ 1,534,322 $ 1,955,618