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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - Residential Mortgage [Member] - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Match Funded Advances [Roll Forward]    
Beginning balance $ 2,409,442 $ 2,552,383
Acquisitions 0 85,521
Transfers from advances 0 10,156
Sales of advances (16,439) 0
Collections of pledged advances, net of new advances, and other (211,510) (130,483)
Ending balance $ 2,181,493 $ 2,517,577