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Match Funded Assets - Schedule of Activity in Match Funded Advances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Match Funded Advances [Roll Forward]      
Increase in allowance for losses $ 21,487 $ 3,949 $ 28,133
Automotive Dealer Financing Notes [Member]      
Match Funded Advances [Roll Forward]      
Beginning balance 0    
Transfer from Other assets 25,180    
Sales 0    
New advances (collections), net (10,212)    
Increase in allowance for losses (2,635)    
Ending balance 32,757 0  
Residential Mortgage [Member]      
Match Funded Advances [Roll Forward]      
Beginning balance 1,451,964 1,706,768 2,409,442
Sales (691) (8,923) (308,990)
New advances (collections), net (306,673) (245,881) (393,684)
Ending balance $ 1,144,600 $ 1,451,964 $ 1,706,768