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Debt Obligations - Credit and Repurchase Facilities Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Jan. 31, 2025	Dec. 31, 2023
Debt Instrument [Line Items]
Outstanding letters of credit	$ 5.0
Minimum
Debt Instrument [Line Items]
Advance rate (as a percent)	70.00%
Maximum
Debt Instrument [Line Items]
Advance rate (as a percent)	80.00%
Structured Business
Debt Instrument [Line Items]
Weighted average note rate including certain fees and costs (as a percent)	7.43%		8.26%
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)	67.00%		69.00%
Agency Business \| Freddie Mac Mortgage
Debt Instrument [Line Items]
Outstanding letters of credit	$ 5.0
Agency Business \| Fannie Mae Mortgage
Debt Instrument [Line Items]
Outstanding letters of credit	70.0
Joint Repurchase Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,000.0
Extension of maturity date (in years)	1 year
Joint Repurchase Facility \| Private Label
Debt Instrument [Line Items]
Advance rate (as a percent)	80.00%
$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
$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
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000.0
Line of credit facility, expiration period	6 months
Line of credit facility, repurchase period	6 months
$1B repurchase facility \| Structured Business \| Minimum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.50%
$1B repurchase facility \| Structured Business \| Minimum \| Multi Family
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	3.26%
$750M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750.0
$650M repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 650.0
$650M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
SOFR floor rate	0.25%
$650M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.46%
$650M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	3.11%
$500M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500.0
Variable rate, spread (as a percent)	1.75%
SOFR floor (as a percentage)	0.15%
$500M credit facility \| Structured Business \| March 2026
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.25%
SOFR floor (as a percentage)	0.15%
$250M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250.0
Extension of maturity date (in years)	1 year
Variable rate, spread (as a percent)	3.25%
SOFR floor (as a percentage)	2.50%
$649 repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 649.0
$400M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400.0
Variable rate, spread (as a percent)	3.25%
SOFR floor (as a percentage)	1.00%
Maturity period extension (in years)	1 year
$400M credit facility \| Structured Business \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 400.0
$350M repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350.0
Maturity period extension (in years)	1 year
$350M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.00%
$250M repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250.0
Extension of maturity date (in years)	1 year
Variable rate, spread (as a percent)	3.25%
SOFR floor (as a percentage)	2.00%
$250M repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 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)	2.65%
$200M repurchase facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200.0
$200M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	1.75%
$200M repurchase facility \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	3.50%
$200M repurchase facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200.0
Maturity period extension (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
$150M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150.0
Variable rate, spread (as a percent)	3.00%
$150M credit facility \| Structured Business \| Minimum
Debt Instrument [Line Items]
Weighted average loan spread	0.0550
$134M loan specific credit facilities \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 134.1
$134M loan specific credit facilities \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	1.91%
$134M loan specific credit facilities \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.40%
SOFR floor rate	2.40%
$134M loan specific credit facilities \| Structured Business \| Prime Rate
Debt Instrument [Line Items]
SOFR floor rate	6.15%
Interest rate	0.85%
$40M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 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
$35M working capital facility \| Structured Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	3.00%
Q Series securitization
Debt Instrument [Line Items]
Weighted average note rate including certain fees and costs (as a percent)	7.46%		7.99%
Q Series securitization \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	1.50%
Maturity period extension (in years)	1 year
Q Series securitization \| Structured Business \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	3.50%
$750M ASAP agreement \| Agency Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750.0
SOFR floor rate	0.25%
Value of portfolio loans and cash as collateral	$ 750.0
Debt instrument, reduced basis spread on variable rate	1.15%
$500M joint repurchase facility \| Agency Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500.0
Debt instrument, reduced basis spread on variable rate	1.48%
$200M credit facility \| Structured Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 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 \| Agency Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200.0
$200M credit facility \| Structured Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200.0
Variable rate, spread (as a percent)	1.35%
$200M credit facility \| Agency Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200.0
Additional 200 million credit facility \| Structured Business \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	1.75%
Additional borrowing capacity	$ 200.0
Line of credit facility, sublimit for principal and interest advances	37.5
$50M credit facility \| Agency Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50.0
Variable rate, spread (as a percent)	1.35%
$75 Million credit facility \| Agency Business
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75.0
Interest rate	2.875%
$75 Million credit facility \| Agency Business \| Freddie Mac Mortgage
Debt Instrument [Line Items]
Committed amount	$ 5.0