Quarterly report pursuant to Section 13 or 15(d)

Fair Value Schedule of Financing Receivables, Non Accrual Status (Details)

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Fair Value Schedule of Financing Receivables, Non Accrual Status (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]        
Residential mortgage loans held-for-sale, at fair value $ 32,686 $ 40,146 $ 387,259 $ 811,431
Collateralized borrowings in securitization trusts, at fair value 2,941,990 3,037,196    
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,181,811 3,271,317    
Loan Held-for-Sale, Residential Mortgages, Unpaid Principal [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Residential mortgage loans held-for-sale, at fair value 40,912 49,986    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 21,016 25,445    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 18,507 21,759    
Loans Held-for-Sale, Residential Mortgages [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Residential mortgage loans held-for-sale, at fair value 32,686 40,146    
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 17,565 21,162    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 15,346 18,203    
Loans Held-for-Investment, Residential Mortgages [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 2,638 2,408    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 1,862 1,419    
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,181,811 3,271,317    
Loans Held-for-Investment, Residential Mortgages, Unpaid Principal [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status 2,589 2,373    
Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due 1,829 1,401    
Residential mortgage loans held-for-investment in securitization trusts, at fair value 3,131,499 3,234,044    
Collateralized Borrowings, Unpaid Principal [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trusts, at fair value 2,913,600 3,015,162    
Borrowings [Member]        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Collateralized borrowings in securitization trusts, at fair value $ 2,941,990 $ 3,037,196