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Debt Obligations - Credit and Repurchase Facilities Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Aug. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2023 USD ($) extension | Dec. 31, 2023 USD ($) | Mar. 01, 2024 USD ($) | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit | $ 5.0 |  |  | $ 5.0 | $ 5.0 |  |
Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Advance rate (as a percent) |  |  |  | 70.00% |  |  |
Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Advance rate (as a percent) |  |  |  | 83.00% |  |  |
Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) | 8.26% |  |  | 8.26% | 8.26% |  | 6.95%
Leverage on loans and investment portfolio financed through credit facilities and repurchase agreements, excluding securities repurchase facility, working capital line of credit and security agreement used to finance leasehold and capital expenditure improvements at corporate office (as a percent) | 69.00% |  |  | 69.00% | 69.00% |  | 73.00%
Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 2.60% |  |  |
Agency Business | Freddie Mac Mortgage |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Committed amount |  |  |  | $ 5.0 |  |  |
Outstanding letters of credit | $ 5.0 |  |  | 5.0 | $ 5.0 |  |
Agency Business | Fannie Mae Mortgage |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit | 64.0 |  |  | 64.0 | 64.0 |  |
Joint Repurchase Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 3,000.0 |  |  | $ 3,000.0 | 3,000.0 |  |
Extension of maturity date (in years) |  |  |  | 1 year |  |  |
Joint Repurchase Facility | Private Label |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Advance rate (as a percent) |  |  |  | 80.00% |  |  |
$2 Billion Joint Repurchase Facility | Forecast | Structured and Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 2,000.0 |
$1B repurchase facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extension of maturity date (in years) |  |  |  | 1 year |  |  |
$1B repurchase facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000.0 |  |  | $ 1,000.0 | 1,000.0 |  |
$1B repurchase facility | Structured Business | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average loan spread | 0.0240 |  |  |  |  |  |
$1B repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  | 2.50% |  |  |  |  |
$1B repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.25% |  |  |
$500M repurchase facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500.0 |  |  | $ 500.0 | $ 500.0 |  |
$500M repurchase facility | Structured Business | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.76% |  |  |
$500M repurchase facility | Structured Business | Minimum | Multi Family |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  | 3.26% |  |
$500M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 0.25% |  |  |
$500M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.46% |  |  |
$500M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 3.11% |  |  |
$500M repurchase facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 500.0 |  |  | $ 500.0 | $ 500.0 |  |
$450M Credit Facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 450.0 |  |  | $ 450.0 | 450.0 |  |
Number of extension options | extension |  |  |  | 2 |  |  |
Maturity period extension (in years) |  |  |  | 1 year |  |  |
$450M Credit Facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  | 2.00% |  |  |  |
$250M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 250.0 |  |  | $ 250.0 | 250.0 |  |
$250M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Additional borrowing capacity | 25.0 |  |  | $ 25.0 | 25.0 |  |
$250M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.61% |  |  |
$250M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 3.31% |  |  |
$250M repurchase facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 250.0 |  |  | $ 250.0 | 250.0 |  |
Maturity period extension (in years) |  |  |  | 1 year |  |  |
$250M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.00% |  |  |
$250M repurchase facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.40% |  |  |
$225M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 225.0 |  |  | $ 225.0 | 225.0 |  |
$225M credit facility | Structured Business | Minimum | SFR - Fixed Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 3.00% |  |  |
$225M credit facility | Structured Business | Maximum | SFR - Fixed Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 4.10% |  |  |
$225M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.55% |  |  |
$200M repurchase facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extension of maturity date (in years) |  |  |  | 6 months |  |  |
$200M repurchase facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 200.0 |  |  | $ 200.0 | 200.0 |  |
$200M repurchase facility | Structured Business | Minimum | Multi Family |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 1.50% |  |  |
$200M repurchase facility | Structured Business | Maximum | Multi Family |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
LIBOR floor rate |  |  |  | 1.86% |  |  |
$200M repurchase facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 200.0 |  |  | $ 200.0 | 200.0 |  |
Extension of maturity date (in years) |  |  |  | 1 year |  |  |
$200M repurchase facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate increase |  |  |  | 2.55% |  |  |
$200M repurchase facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 200.0 |  |  | $ 200.0 | 200.0 |  |
$200M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 200.0 |  |  | $ 200.0 | 200.0 |  |
$200M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 1.40% |  |  |
$200M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Multi Family |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 1.75% |  |  |
$200M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) | Independent living facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 3.50% |  |  |
$200M credit facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 200.0 |  |  | $ 200.0 | 200.0 |  |
Loan Specific Credit Facility $156.5 Million | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 120.7 |  |  | $ 120.7 | $ 120.7 |  |
Loan Specific Credit Facility $156.5 Million | Structured Business | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 1.91% |  |  |
Loan Specific Credit Facility $156.5 Million | Structured Business | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.60% |  |  |
Loan Specific Credit Facility $156.5 Million | Structured Business | Prime Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 3.00% |  |  | 3.00% | 3.00% |  |
$50M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50.0 |  |  | $ 50.0 | $ 50.0 |  |
Maturity period extension (in years) |  |  |  | 1 year |  |  |
$50M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.10% |  |  |
$50M credit facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 50.0 |  |  | $ 50.0 | 50.0 |  |
Variable rate, spread (as a percent) |  |  |  | 1.35% |  |  |
$25M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 25.0 |  |  | $ 25.0 | 25.0 |  |
$25M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.60% |  |  |
LIBOR floor rate |  |  |  | 4.25% |  |  |
$40M credit facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 40.0 |  |  | $ 40.0 | 40.0 |  |
Maturity period extension (in years) |  |  |  | 1 year |  |  |
$40M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 2.35% |  |  |
$35M working capital facility | Structured Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 35.0 |  |  | $ 35.0 | 35.0 |  |
$35M working capital facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 3.00% |  |  |
$750M ASAP agreement | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 750.0 |  |  | $ 750.0 | 750.0 |  |
LIBOR floor rate |  |  |  | 0.25% |  |  |
Value of portfolio loans and cash as collateral | 750.0 |  |  | $ 750.0 | 750.0 |  |
Debt instrument, reduced basis spread on variable rate |  |  |  | 1.15% |  |  |
$100M credit facility | Structured Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 100.0 |  |  | $ 100.0 | 100.0 |  |
Variable rate, spread (as a percent) |  |  |  | 1.46% |  |  |
Additional borrowing capacity | 37.5 |  |  | $ 37.5 | 37.5 |  |
Interest rate increase |  |  |  | 1.86% |  |  |
$100M credit facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 100.0 |  |  | $ 100.0 | 100.0 |  |
$75 Million credit facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 75.0 |  |  | $ 75.0 | $ 75.0 |  |
Interest rate | 2.875% |  |  | 2.875% | 2.875% |  |
$500M joint repurchase facility | Agency Business |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500.0 |  |  | $ 500.0 | $ 500.0 |  |
$500M joint repurchase facility | Agency Business | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500.0 |  |  | $ 500.0 | $ 500.0 |  |
Debt instrument, reduced basis spread on variable rate |  |  |  | 1.48% |  |  |

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