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Secured Financing Agreements - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 08, 2020
Dec. 31, 2019
Repurchase Agreement Counterparty [Line Items]      
Repurchase agreements outstanding $ 5,944,201,000   $ 13,427,545,000
Margin cash collateral pledged to repurchase agreement counterparties $ 59,755,000   $ 20,211,000
Decrease in share price (as a percent) 50.00%    
Goldman Sachs      
Repurchase Agreement Counterparty [Line Items]      
Amount at risk $ 535,000,000    
Warehouse Agreement Borrowings      
Repurchase Agreement Counterparty [Line Items]      
Unused warehouse credit facilities $ 1,100,000,000    
Repurchase Agreements | Stockholders' Equity, Total | Goldman Sachs | Credit Concentration Risk | Asset Pledged as Collateral      
Repurchase Agreement Counterparty [Line Items]      
Concentration risk (as a percent) 16.00%    
Weighted average maturity 1128 days    
Securitized debt | Credit Agreement      
Repurchase Agreement Counterparty [Line Items]      
Principal balance $ 400,000,000 $ 400,000,000  
Long-term financing agreements, interest rate (as a percent) 7.00%    
Secured Debt Subject to Automatic Stay Provisions      
Repurchase Agreement Counterparty [Line Items]      
Principal balance $ 860,000,000    
Minimum      
Repurchase Agreement Counterparty [Line Items]      
Net assets $ 1,600,000,000    
Minimum | Warehouse Agreement Borrowings      
Repurchase Agreement Counterparty [Line Items]      
Maturity dates of credit facility 30 days    
Maximum      
Repurchase Agreement Counterparty [Line Items]      
Net assets $ 1,750,000,000    
Maximum | Warehouse Agreement Borrowings      
Repurchase Agreement Counterparty [Line Items]      
Maturity dates of credit facility 1 year    
Not Subject to Additional Margin Requirements      
Repurchase Agreement Counterparty [Line Items]      
Repurchase agreements outstanding $ 1,300,000,000    
Maturity 30 to 90 Days | Repurchase Agreements      
Repurchase Agreement Counterparty [Line Items]      
Repurchase agreements outstanding $ 201,000,000    
Borrowing rates (as a percent) 18.70%