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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%