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v3.20.2

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 |  |  |

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