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Other Investments - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
partnership
Dec. 31, 2019
USD ($)
Net Investment Income [Line Items]              
Number of partnerships consolidated | partnership           2  
Commitment to fund partnership $ 94,000,000            
Servicing asset, fair value 242,059,000 $ 242,059,000   $ 242,059,000     $ 151,582,000
Equity investment income   341,000 $ 560,000 615,000 $ 732,000    
Investment fair value changes, net   107,047,000 11,444,000 (611,557,000) 34,741,000    
Interest income   121,982,000 150,117,000 450,009,000 429,700,000    
Servicer advance financing              
Net Investment Income [Line Items]              
Collateral amounts 242,000,000 242,000,000   242,000,000      
Equity investment income   3,000,000 3,000,000 8,000,000 9,000,000    
Investment fair value changes, net   100,000 2,000,000 (6,000,000) 3,000,000    
Residential Loans              
Net Investment Income [Line Items]              
Servicing asset, fair value 258,621,000 258,621,000   258,621,000     169,204,000
Servicing asset, unpaid principal balance on underlying loan 9,710,000,000 9,710,000,000   9,710,000,000      
Excess MSRs              
Net Investment Income [Line Items]              
Servicing asset, fair value 35,070,000 35,070,000   35,070,000     31,814,000
Investment fair value changes, net   (1,000,000) (2,000,000) (8,000,000)      
Interest income   3,000,000 2,000,000 9,000,000 6,000,000    
Light-Renovation Multifamily Loans              
Net Investment Income [Line Items]              
Equity investment income   300,000 1,000,000 600,000 500,000    
Carrying amount of investment in partnership 0 0   0      
Commitment to fund partnership, funded amount 0 0   0      
Securities acquired from first securitization transaction   28,000,000   56,000,000      
MSRs              
Net Investment Income [Line Items]              
Servicing asset, fair value 14,878,000 14,878,000   14,878,000     42,224,000
Servicing asset 3,140,000,000 3,140,000,000   3,140,000,000     $ 4,350,000,000
MSR income (losses), net   (2,000,000) $ 400,000 (6,000,000) $ 2,000,000    
Shared home appreciation options              
Net Investment Income [Line Items]              
Payments to acquire investments 47,000,000            
Shared home appreciation options | Commitment To Fund Investment              
Net Investment Income [Line Items]              
Investment fair value changes, net   2,000,000   (4,000,000)      
Commitment to fund loan $ 3,000,000 $ 3,000,000   $ 3,000,000