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Match Funded Advances - Schedule of Activity in Match Funded Advances (Details) - Residential Mortgage [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 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	(96,408)	0
Collections of pledged advances, net of new advances, and other	(357,416)	(288,481)
Ending balance	$ 1,955,618	$ 2,359,579