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Match Funded Assets - Schedule of Activity in Match Funded Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Match Funded Advances [Roll Forward]
Decrease (increase) in allowance for losses	$ (6,794)	$ 21,487	$ 3,949
Residential Mortgage [Member]
Match Funded Advances [Roll Forward]
Beginning balance	1,144,600	1,451,964	1,706,768
Sales	0	(691)	(8,923)
New advances (collections), net	(278,929)	(306,673)	(245,881)
Ending balance	937,294	1,144,600	1,451,964
Automotive Dealer Financing Notes [Member]
Match Funded Advances [Roll Forward]
Beginning balance	32,757	0
Transfer (to) from other assets	(36,896)	25,180
Sales	0
New advances (collections), net	1,504	10,212
Decrease (increase) in allowance for losses	2,635	(2,635)
Ending balance	$ 0	$ 32,757	$ 0