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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Match Funded Advances [Roll Forward]    
Beginning balance $ 1,706,768  
Ending balance 1,614,447  
Residential Mortgage [Member]    
Match Funded Advances [Roll Forward]    
Beginning balance 1,706,768 $ 2,409,442
Sales of advances 0 (16,439)
Collections of pledged advances, net (92,321) (211,510)
Ending balance $ 1,614,447 $ 2,181,493