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Long-Term Debt - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Aug. 31, 2017 USD ($) | Jan. 31, 2016 | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
FHLB transition period |  |  |  |  | 5 years |  |  |  |
Repayments of FHLBC borrowings |  |  |  |  |  |  |  |  | $ 2,000,000,000.0
Federal home loan bank stock | $ 43,393,000 |  |  |  |  |  |  |  | 5,000,000
Accrued interest payable | 6,000,000 |  |  |  |  |  |  |  | 1,000,000
Accrued interest payable | $ 60,655,000 |  |  |  |  |  |  |  | 34,858,000
Convertible notes | Exchangeable Senior Notes Due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  | 5.75% |  |  |  |  |  |  |
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 4,000,000
Convertible notes |  | $ 201,000,000 |  |  |  |  |  |  | $ 172,000,000
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
Accrued interest payable |  |  |  |  |  |  |  |  | $ 2,000,000
Repurchased debt instrument, face amount |  |  |  |  |  |  | $ 29,000,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | 6,000,000 |  |
Convertible notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  | 5.625% |  |  |  |  |  |
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 2,000,000
Convertible notes |  |  | $ 200,000,000 |  |  |  |  |  | 150,000,000
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 |  |  |  |  |  |
Accrued interest payable |  |  |  |  |  |  |  |  | 4,000,000
Repurchased debt instrument, face amount |  |  |  |  |  |  | 50,000,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | 9,000,000 |  |
Percent of par at issuance |  |  | 99.50% |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  |  | 500,000
Convertible notes | Senior Notes Due 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  | 4.75% |  |  |  |  |
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 3,000,000
Convertible notes |  |  |  | $ 245,000,000 |  |  |  |  | $ 199,000,000
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
Accrued interest payable |  |  |  |  |  |  |  |  | $ 4,000,000
Repurchased debt instrument, face amount |  |  |  |  |  |  | 46,000,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | 10,000,000 |  |
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 |  |  |  |  |  |  |  |  | 2.25%
Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | $ 40,000,000
Trust Preferred Securities and Subordinated Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Accrued interest payable | $ 1,000,000 |  |  |  |  |  |  |  | 1,000,000
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 114,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 115,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 1,000,000
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility Two | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.85% |  |  |
Variable rate, floor (as a percent) |  |  |  |  |  | 0.50% |  |  |
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 249,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 252,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 2,000,000
Maximum borrowing capacity |  |  |  |  |  |  | 372,000,000 |  |
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility One | Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 197,000,000 |  |
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility One | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 175,000,000 |  |
Line of Credit | Non-Recourse Business Purpose Loan Financing Facility One | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 7.50% |  |
Variable rate, floor (as a percent) |  |  |  |  |  |  | 1.50% |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility Through September 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 80,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 80,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 200,000
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 106,000,000
Maximum borrowing capacity |  |  |  |  |  | $ 250,000,000 |  |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility Through September 2023 | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 3.00% |  |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 51,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 52,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 500,000
Maximum borrowing capacity |  |  |  |  |  |  | $ 350,000,000 |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable rate, floor (as a percent) |  |  |  |  |  |  | 1.00% |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.00% |  |
Line of Credit | Recourse Business Purpose Loan Financing Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.50% |  |
Line of Credit | Recourse Revolving Debt Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  | 0
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 50,000,000 |
Line of Credit | Recourse Revolving Debt Facility | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 3.00% |
Bridge Loan | Non-Recourse Business Purpose Loan Financing Facility Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 186,000,000
Bridge Loan | Non-Recourse Business Purpose Loan Financing Facility One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 338,000,000
Bridge Loan | Recourse Business Purpose Loan Financing Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 24,000,000
Loans Payable [Member] | Non-Recourse Business Purpose Loan Financing Facility One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 21,000,000
Loans Payable [Member] | Recourse Business Purpose Loan Financing Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 49,000,000
Affiliated Entity | Recourse Subordinate Securities Financing Facilities [Member] | Non-Marginable Debt Repurchase Agreement One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument interest rate | 4.21% |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 177,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 178,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 1,000,000
Affiliated Entity | Recourse Subordinate Securities Financing Facilities [Member] | Non-Marginable Debt Repurchase Agreement Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  | 4.21% |  |  |
Long-term debt, net |  |  |  |  |  |  |  |  | 102,000,000
Long-term debt, gross |  |  |  |  |  |  |  |  | 103,000,000
Unamortized deferred issuance costs |  |  |  |  |  |  |  |  | 1,000,000
Affiliated Entity | Sequoia Choice | Recourse Subordinate Securities Financing Facilities [Member] | Non-Marginable Debt Repurchase Agreement One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 249,000,000
Affiliated Entity | CAFL | Recourse Subordinate Securities Financing Facilities [Member] | Non-Marginable Debt Repurchase Agreement Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Pledged assets real estate pledged as collateral, at fair value |  |  |  |  |  |  |  |  | 114,000,000
FHLB Chicago | FHLB Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding FHLB advances | $ 2,000,000,000.00 |  |  |  |  |  |  |  | $ 1,000,000
Weighted average interest rate | 1.88% |  |  |  |  |  |  |  | 0.30%
Weighted average maturity (in years) | 6 years |  |  |  |  |  |  |  |
FHLB Chicago | Redwood | Held-for sale residential loans | Restricted cash |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Residential mortgage loans securing FHLB advances |  |  |  |  |  |  |  |  | $ 1,000,000

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