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Other Investments - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jan. 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Net Investment Income [Line Items]                
Commitment to fund partnership $ 94,000              
Servicing asset, fair value 249,705   $ 249,705     $ 249,705   $ 151,582
Equity investment (loss) income     (574)   $ (96) 274 $ 172  
Investment fair value changes, net     152,228   3,138 (718,604) 23,297  
Interest income     129,946   148,542 328,027 279,583  
Servicer advance financing                
Net Investment Income [Line Items]                
Collateral amounts 250,000   250,000     250,000    
Equity investment (loss) income     3,000   3,000 6,000 5,000  
Investment fair value changes, net     (100)   400 (6,000) 1,000  
Residential Loans                
Net Investment Income [Line Items]                
Servicing asset, fair value 266,948   266,948     266,948   169,204
Servicing asset, unpaid principal balance on underlying loan 10,260,000   10,260,000     10,260,000    
Excess MSRs                
Net Investment Income [Line Items]                
Servicing asset, fair value 36,197   36,197     36,197   31,814
Investment fair value changes, net     3,000   (100) (7,000) (500)  
Interest income     3,000   2,000 6,000 4,000  
Light-Renovation Multifamily Loans                
Net Investment Income [Line Items]                
Commitment to fund partnership   $ 78,000            
Equity investment (loss) income     (1,000)   (100) 300 (100)  
Commitment to fund partnership, funded amount 70,000   70,000     70,000    
Securities acquired from first securitization transaction       $ 28,000        
Carrying amount of investment in partnership 30,000   30,000     30,000    
MSRs                
Net Investment Income [Line Items]                
Servicing asset, fair value 19,661   19,661     19,661   42,224
Servicing asset 3,630,000   3,630,000     3,630,000   $ 4,350,000
MSR income, net     (1,000)   $ 2,000 (3,000) $ 2,000  
Shared home appreciation options                
Net Investment Income [Line Items]                
Investment fair value changes, net     1,000     (7,000)    
Payments to acquire investments 47,000              
Shared home appreciation options | Commitment To Fund Investment                
Net Investment Income [Line Items]                
Commitment to fund loan $ 3,000   $ 3,000     $ 3,000