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Long-Term Debt - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Aug. 31, 2017 USD ($) $ / shares | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 USD ($) | Mar. 31, 2020 | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2019 | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 1,640,833,000 |  | $ 1,425,485,000
Borrowings |  |  |  |  |  |  |  |  |  | 1,650,576,000 |  | 1,441,331,000
Accrued interest payable |  |  |  |  |  |  |  |  |  | $ 39,297,000 |  | $ 34,858,000
Non-Recourse Business Purpose Loan Financing Facility One | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.50% |  |  |  |  |
Non-Recourse Business Purpose Loan Financing Facility Two | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 1.50% |  |  |  |
Recourse Business Purpose Loan Financing Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
Convertible notes | Exchangeable Senior Notes Due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 201,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 5.75% |  |  |  |  |  |  |  | 5.75% |  | 5.75%
Net proceeds from issuance of convertible debt |  | $ 195,000,000 |  |  |  |  |  |  |  |  |  |
Interest expense yield |  | 6.30% |  |  |  |  |  |  |  |  |  |
Convertible debt, conversion ratio | 0.0552644 |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 18.09 |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 29,000,000 |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | 6,000,000 |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 168,708,000 |  | $ 167,933,000
Borrowings |  |  |  |  |  |  |  |  |  | 172,092,000 |  | 172,092,000
Accrued interest payable |  |  |  |  |  |  |  |  |  | $ 2,474,000 |  | $ 2,474,000
Convertible notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 5.625% | 5.625% |  |  |  |  |  |  | 5.625% |  | 5.625%
Net proceeds from issuance of convertible debt |  |  | $ 194,000,000 |  |  |  |  |  |  |  |  |
Interest expense yield |  |  | 6.20% |  |  |  |  |  |  |  |  |
Convertible debt, conversion ratio |  |  | 0.0548317 |  |  |  |  |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 18.24 |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | 9,000,000 |  |  |  |
Percent of par at issuance |  |  | 99.50% |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 148,128,000 |  | $ 147,385,000
Borrowings |  |  |  |  |  |  |  |  |  | 150,200,000 |  | 150,200,000
Accrued interest payable |  |  |  |  |  |  |  |  |  | $ 3,896,000 |  | $ 3,896,000
Convertible notes | Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 245,000,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  | 4.75% |  |  |  |  |  | 4.75% |  | 4.75%
Net proceeds from issuance of convertible debt |  |  |  | $ 238,000,000 |  |  |  |  |  |  |  |
Interest expense yield |  |  |  | 5.30% |  |  |  |  |  |  |  |
Convertible debt, conversion ratio |  |  |  | 0.0544764 |  |  |  |  |  |  |  |
Convertible senior notes conversion per share (in dollars per share) | $ / shares |  |  |  | $ 18.36 |  |  |  |  |  |  |  |
Repurchased debt instrument, face amount |  |  |  |  |  |  |  | 46,000,000 |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 196,793,000 |  | $ 195,767,000
Borrowings |  |  |  |  |  |  |  |  |  | 198,629,000 |  | 198,629,000
Accrued interest payable |  |  |  |  |  |  |  |  |  | 3,564,000 |  | 3,564,000
Trust preferred securities |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Trust preferred securities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  | 2.25% |  |
Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | 988,483,000 |  | 774,726,000
Borrowings |  |  |  |  |  |  |  |  |  | 990,155,000 |  | 779,910,000
Accrued interest payable |  |  |  |  |  |  |  |  |  | 815,000 |  | $ 1,799,000
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 400,000,000 |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | 306,708,000 |  |
Borrowings |  |  |  |  |  |  |  |  |  | $ 307,215,000 |  |
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility Two | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  | 2.75% |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility Through September 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |
Long-term debt, net |  |  |  |  |  |  |  |  |  | 234,226,000 |  |
Borrowings |  |  |  |  |  |  |  |  |  | $ 234,349,000 |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility Through September 2023 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 3.35% |  |  |  | 2.21% |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  | 2.75% |  |  |  |
Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  | $ 708,000,000 |  |
Affiliated Entity | Recourse Subordinate Securities Financing | Non-Marginable Debt Repurchase Agreement One |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.21% |  | 4.21%
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 144,072,000 |  | $ 177,438,000
Borrowings |  |  |  |  |  |  |  |  |  | $ 144,385,000 |  | $ 178,167,000
Affiliated Entity | Recourse Subordinate Securities Financing | Non-Marginable Debt Repurchase Agreement Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.21% |  | 4.21%
Long-term debt, net |  |  |  |  |  |  |  |  |  | $ 101,998,000 |  | $ 102,200,000
Borrowings |  |  |  |  |  |  |  |  |  | $ 102,351,000 |  | $ 102,856,000
Redwood | Recourse Subordinate Securities Financing Receivable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate, over Time |  |  |  |  |  |  |  |  |  |  | 4.21% |
Redwood | Affiliated Entity | CAFL(1) | Recourse Subordinate Securities Financing Receivable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate, over Time |  |  |  |  | 4.75% |  |  |  | 4.21% |  |  |

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