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Financing Arrangements, Residential Mortgage Loans (Details) - Deutsche Bank AG, Cayman Islands Branch - USD ($)
9 Months Ended
Sep. 30, 2017
May 24, 2017
Dec. 31, 2016
Pool of Distressed Residential Mortgage Loans      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Maximum repurchase amount $ 200,000,000    
Principal amount 50,000,000    
Repurchase agreement, amount outstanding $ 140,300,000   $ 193,800,000
Repurchase agreement, effective interest rate 3.74%   3.26%
Pool of Distressed Residential Mortgage Loans | LIBOR      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Interest rate, basis spread 2.50%    
Residential Mortgage      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Maximum repurchase amount   $ 25,000,000 $ 100,000,000
Repurchase agreement, amount outstanding $ 20,700,000   $ 0
Residential Mortgage | LIBOR      
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]      
Interest rate, basis spread 3.50%    
Repurchase agreement, effective interest rate 4.74%