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Other Investments - Additional Information (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Jan. 31, 2019 | May 31, 2018 | Feb. 28, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership |  | $ 71,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000 | $ 1,000 |  |
Investment fair value changes, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,500 | (25,689) | $ 10,374 |
Interest income |  |  |  |  |  |  | $ 192,581 | $ 150,117 | $ 148,542 | $ 131,041 | $ 119,725 | $ 99,397 | $ 82,976 | $ 76,619 |  | 622,281 | 378,717 | 248,057 |
Equity investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,405 | 618 | 0 |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority interest, percentage |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional equity, percent |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Light-Renovation Multifamily Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership |  |  |  | $ 78,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership, funded amount | $ 41,000 |  |  |  |  |  | 41,000 |  |  |  |  |  |  |  |  | 41,000 |  |  |
Carrying amount of equity method investments | 40,000 |  |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  | $ 40,000 |  |  |
Equity investment income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment earnings |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  | 600 |  |
Payments to acquire equity method investment |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional equity, term |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Option to purchase additional equity, amount |  |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  | 400 |  |
MSRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 42,224 | 60,281 |  |  |  |  | 42,224 |  |  |  | 60,281 |  |  |  |  | $ 42,224 | 60,281 | $ 63,598 | $ 118,526
Servicing assets | 4,350,000 | 4,930,000 |  |  |  |  | 4,350,000 |  |  |  | 4,930,000 |  |  |  |  | 4,350,000 | 4,930,000 |  |
Shared home appreciation options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment fair value changes, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 842 |  |  |
Payments to acquire investments | 43,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000 |  |  |
Commitment To Fund Investment | Shared home appreciation options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitment | 7,000 |  |  |  |  |  | 7,000 |  |  |  |  |  |  |  |  | 7,000 |  |  |
Residential Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 169,204 | 300,468 |  |  |  |  | 169,204 |  |  |  | 300,468 |  |  |  |  | 169,204 | 300,468 |  |
Servicing asset, unpaid principal balance on underlying loan | 7,940,000 |  |  |  |  |  | 7,940,000 |  |  |  |  |  |  |  |  | 7,940,000 |  |  |
Excess MSRs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing asset, fair value | 31,814 | $ 27,312 |  |  |  |  | 31,814 |  |  |  | $ 27,312 |  |  |  |  | 31,814 | 27,312 |  |
Investment fair value changes, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,000) | 2,000 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000 |  | 1,000 |  |
Servicer advance financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral amounts | $ 152,000 |  |  |  |  |  | $ 152,000 |  |  |  |  |  |  |  |  | 152,000 |  |  |
Investment fair value changes, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 | $ (1,000) |  |

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