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Summary of Significant Accounting Policies - Adoption of Financial Instruments - Credit Losses (Topic 326) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate2019-05          
Cumulative-effect adjustment for implementation of fair value option $ 2,253,383 $ 2,162,941 $ 2,205,029 $ 1,846,999 $ 1,527,682 $ 1,180,293
Assets            
Fair Value 218,706   189,965      
Receivables and other assets 142,945   169,214      
Total Assets [1] 4,621,113   23,483,369      
Stockholders' Equity            
Accumulated deficit (583,616)   (148,863)      
Total Stockholders' Equity 2,253,383   2,205,733      
Transition Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment for implementation of fair value option     12,284      
Assets            
Fair Value     1,394      
Investment amount     2,420      
Receivables and other assets     2,755      
Total Assets     12,284      
Stockholders' Equity            
Accumulated deficit     12,284      
Total Stockholders' Equity     12,284      
Transition Adjustment | Residential loans, net            
Assets            
Residential mortgage loans     5,715      
Cumulative Effect, Period Of Adoption, Adjusted Balance            
Assets            
Fair Value     107,477      
Investment amount     182,465      
Receivables and other assets     3,620      
Total Assets     502,033      
Stockholders' Equity            
Accumulated deficit     (136,579)      
Total Stockholders' Equity     (136,579)      
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential loans, net            
Assets            
Residential mortgage loans     208,471      
Previously Reported            
Assets            
Fair Value     106,083      
Investment amount     180,045      
Receivables and other assets     865      
Total Assets     489,749      
Stockholders' Equity            
Accumulated deficit     (148,863)      
Total Stockholders' Equity     (148,863)      
Previously Reported | Residential loans, net            
Assets            
Residential mortgage loans     202,756      
Retained Earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment for implementation of fair value option $ (583,616) $ (646,629) (148,863) $ (145,896) $ (128,207) $ (103,178)
Retained Earnings | Transition Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment for implementation of fair value option     $ 12,284      
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,852,657 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,440,936 and $17,878,314, respectively. See Note 9 for further discussion.