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Debt Obligations - Credit and Repurchase Facilities (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt Obligations
UPB		$ 4,493,699	$ 2,238,722
Debt Carrying Value		4,481,579	2,234,883
Collateral Carrying Value		$ 5,585,460	$ 2,724,420
Weighted Average Note Rate (as a percent)		2.21%	2.20%
Utilization of credit facility	$ 67,000
Minimum
Debt Obligations
Maximum advance rate		75.00%
Maximum
Debt Obligations
Maximum advance rate		85.00%
$50M credit facility
Debt Obligations
UPB		$ 9,295	$ 88,911
Debt Carrying Value		9,295	88,896
Collateral Carrying Value		$ 9,295	$ 88,911
Weighted Average Note Rate (as a percent)		1.40%	1.65%
$25M credit facility.
Debt Obligations
UPB		$ 10,285	$ 9,539
Debt Carrying Value		10,218	9,323
Collateral Carrying Value		$ 14,773	$ 14,340
Weighted Average Note Rate (as a percent)		2.38%	2.43%
Joint Repurchase Facility
Debt Obligations
Maximum borrowing capacity		$ 2,500,000
Additional borrowing capacity		$ 150,000
Extension of maturity date (in years)		1 year
Joint Repurchase Facility \| Private Label
Debt Obligations
Maximum advance rate		80.00%
Joint Repurchase Facility \| Structured loans
Debt Obligations
Maximum advance rate		85.00%
Joint Repurchase Facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		5.75%
Structured Transaction Business
Debt Obligations
UPB		$ 3,533,016	$ 1,286,100
Debt Carrying Value		3,525,307	1,282,845
Collateral Carrying Value		$ 4,548,653	$ 1,755,825
Weighted Average Note Rate (as a percent)		2.34%	2.73%
Unamortized deferred finance costs		$ 7,700	$ 3,300
Weighted average note rate including certain fees and costs (as a percent)		2.51%	2.97%
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)		77.00%	69.00%
Structured Transaction Business \| LIBOR
Debt Obligations
LIBOR Floor rate		0.25%
Variable rate, spread (as a percent)		3.25%
Structured Transaction Business \| B Piece bonds
Debt Obligations
Debt Instrument, Collateral Amount		$ 47,600	$ 57,800
Structured Transaction Business \| SFR - Fixed Rate
Debt Obligations
Collateral Carrying Value		$ 10,000
Structured Transaction Business \| Senior mortgage loans
Debt Obligations
Weighted Average Note Rate (as a percent)		4.01%
Structured Transaction Business \| $2.00B joint repurchase facility
Debt Obligations
UPB		$ 1,490,434	682,958
Debt Carrying Value		1,486,380	681,006
Collateral Carrying Value		$ 1,877,930	$ 1,054,562
Weighted Average Note Rate (as a percent)		2.56%	2.55%
Maximum borrowing capacity		$ 2,000,000
Structured Transaction Business \| $1.00B repurchase facility
Debt Obligations
UPB		676,608	$ 192,193
Debt Carrying Value		675,415	191,622
Collateral Carrying Value		$ 937,880	$ 259,559
Weighted Average Note Rate (as a percent)		2.04%	2.99%
Maximum borrowing capacity		$ 1,000,000
Structured Transaction Business \| $1.00B repurchase facility \| LIBOR
Debt Obligations
Maximum advance rate		75.00%
LIBOR Floor rate		0.35%
Decrease in interest rate (as a percent)		0.20%
Structured Transaction Business \| $1.00B repurchase facility \| Minimum \| LIBOR
Debt Obligations
Maximum advance rate		2.00%
LIBOR Floor rate		0.35%
Line of Credit Facility, Interest Rate at Period End		2.00%
Utilization of credit facility		$ 250,000
Structured Transaction Business \| $1.00B repurchase facility \| Maximum \| LIBOR
Debt Obligations
LIBOR Floor rate		0.35%
Variable rate, spread (as a percent)		1.75%
Line of Credit Facility, Interest Rate at Period End		2.20%
Utilization of credit facility		$ 250,000
Structured Transaction Business \| $450M repurchase facility
Debt Obligations
UPB		397,842
Debt Carrying Value		397,272
Collateral Carrying Value		$ 511,269
Weighted Average Note Rate (as a percent)		1.89%
Maximum borrowing capacity		$ 450,000
Structured Transaction Business \| $450M repurchase facility \| Minimum
Debt Obligations
Variable rate, spread (as a percent)		2.00%
Structured Transaction Business \| $450M repurchase facility \| Minimum \| Multifamily
Debt Obligations
Variable rate, spread (as a percent)		1.75%
Structured Transaction Business \| $450M repurchase facility \| Maximum \| Multifamily
Debt Obligations
Variable rate, spread (as a percent)		2.25%
Structured Transaction Business \| $450M repurchase facility \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		2.75%
Structured Transaction Business \| $398.7M repurchase facility (2)
Debt Obligations
UPB		$ 242,034	$ 71,656
Debt Carrying Value		241,450	71,627
Collateral Carrying Value		$ 289,956	$ 87,242
Weighted Average Note Rate (as a percent)		3.04%	2.73%
Maximum borrowing capacity		$ 398,700
Structured Transaction Business \| $325M repurchase facility
Debt Obligations
UPB		294,145	$ 31,780
Debt Carrying Value		293,700	31,780
Collateral Carrying Value		$ 385,337	$ 40,551
Weighted Average Note Rate (as a percent)		1.76%	1.92%
Maximum borrowing capacity		$ 325,000
Structured Transaction Business \| $225M credit facility
Debt Obligations
UPB		28,213	$ 23,857
Debt Carrying Value		27,826	23,606
Collateral Carrying Value		$ 42,270	$ 31,809
Weighted Average Note Rate (as a percent)		2.79%	4.06%
Maximum borrowing capacity		$ 225,000
Structured Transaction Business \| $225M credit facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		2.50%
Structured Transaction Business \| $225M credit facility \| Minimum \| SFR - Fixed Rate
Debt Obligations
LIBOR Floor rate		2.75%
Structured Transaction Business \| $225M credit facility \| Maximum \| SFR - Fixed Rate
Debt Obligations
LIBOR Floor rate		3.85%
Structured Transaction Business \| $200M credit facility
Debt Obligations
UPB		$ 177,599	$ 39,389
Debt Carrying Value		177,406	39,346
Collateral Carrying Value		$ 236,538	$ 47,912
Weighted Average Note Rate (as a percent)		1.70%	2.24%
Maximum borrowing capacity		$ 200,000
Structured Transaction Business \| $200M credit facility \| SOFR \| Multifamily
Debt Obligations
Variable rate, spread (as a percent)		1.61%
Structured Transaction Business \| $200M credit facility \| SOFR \| Independent living facilities
Debt Obligations
Variable rate, spread (as a percent)		2.31%
Structured Transaction Business \| $200M credit facility \| SOFR \| Assisted living facilities
Debt Obligations
Variable rate, spread (as a percent)		2.56%
Structured Transaction Business \| $200M credit facility \| LIBOR
Debt Obligations
LIBOR Floor rate		0.25%
Variable rate, spread (as a percent)		1.35%
Structured Transaction Business \| $200M credit facility \| Healthcare Related Loans \| SOFR \| Assisted living facilities
Debt Obligations
Additional borrowing capacity		$ 25,000
Structured Transaction Business \| $153.9M loan specific credit facilities
Debt Obligations
UPB		153,937	$ 148,798
Debt Carrying Value		153,727	148,615
Collateral Carrying Value		$ 214,300	$ 198,550
Weighted Average Note Rate (as a percent)		3.14%	3.03%
Maximum borrowing capacity		$ 153,900
Structured Transaction Business \| $153.9M loan specific credit facilities \| Prime Rate
Debt Obligations
Fixed interest rate (as a percent)		3.25%
Structured Transaction Business \| $153.9M loan specific credit facilities \| Minimum
Debt Obligations
Fixed interest rate (as a percent)		3.00%
Structured Transaction Business \| $153.9M loan specific credit facilities \| Minimum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		2.20%
Structured Transaction Business \| $153.9M loan specific credit facilities \| Maximum
Debt Obligations
Fixed interest rate (as a percent)		4.00%
Structured Transaction Business \| $153.9M loan specific credit facilities \| Maximum \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		2.40%
Structured Transaction Business \| $50M credit facility
Debt Obligations
UPB		$ 29,200	$ 16,002
Debt Carrying Value		29,194	15,992
Collateral Carrying Value		$ 36,500	$ 21,300
Weighted Average Note Rate (as a percent)		2.13%	2.17%
Maximum borrowing capacity		$ 50,000
Structured Transaction Business \| $50M credit facility \| LIBOR
Debt Obligations
Variable rate, spread (as a percent)		2.00%
Structured Transaction Business \| $30M working capital facility
Debt Obligations
UPB			$ 30,000
Debt Carrying Value			$ 30,000
Weighted Average Note Rate (as a percent)			3.55%
Maximum borrowing capacity		$ 30,000
Structured Transaction Business \| $30M working capital facility \| LIBOR
Debt Obligations
LIBOR Floor rate		0.25%
Variable rate, spread (as a percent)		3.25%
Structured Transaction Business \| $25M credit facility
Debt Obligations
UPB		$ 1,235
Debt Carrying Value		1,235
Collateral Carrying Value		$ 1,900
Weighted Average Note Rate (as a percent)		4.06%
Maximum borrowing capacity		$ 25,000
Structured Transaction Business \| $25M credit facility \| LIBOR
Debt Obligations
LIBOR Floor rate		3.85%
Variable rate, spread (as a percent)		2.50%
Structured Transaction Business \| $25M credit facility.
Debt Obligations
Maximum borrowing capacity		$ 25,000
Structured Transaction Business \| $25M credit facility. \| SOFR
Debt Obligations
Variable rate, spread (as a percent)		2.35%
Structured Transaction Business \| $1M master security agreement
Debt Obligations
UPB		$ 635	$ 1,441
Debt Carrying Value		$ 635	$ 1,441
Weighted Average Note Rate (as a percent)		4.01%	4.10%
Maximum borrowing capacity		$ 1,000
Structured Transaction Business \| Repurchase facility - securities (3)
Debt Obligations
UPB		30,849	$ 38,487
Debt Carrying Value		$ 30,849	$ 38,487
Weighted Average Note Rate (as a percent)		3.40%	3.47%
Structured Transaction Business \| $150M credit facility \| SOFR
Debt Obligations
Maximum borrowing capacity		$ 150,000
Variable rate, spread (as a percent)		1.46%
Additional borrowing capacity		$ 50,000
Decrease in interest rate (as a percent)		1.86%
Structured Transaction Business \| $400M repurchase facility
Debt Obligations
Maximum borrowing capacity		$ 400,000
Structured Transaction Business \| $400M repurchase facility \| SOFR
Debt Obligations
LIBOR Floor rate		0.25%
Structured Transaction Business \| $400M repurchase facility \| Minimum \| SOFR
Debt Obligations
Variable rate, spread (as a percent)		1.75%
Structured Transaction Business \| $400M repurchase facility \| Maximum \| SOFR
Debt Obligations
Variable rate, spread (as a percent)		2.25%
Structured Transaction Business \| $200 million repurchase facility
Debt Obligations
Maximum borrowing capacity		$ 200,000
Additional borrowing capacity		325,000
Agency Business
Debt Obligations
UPB		960,683	$ 952,622
Debt Carrying Value		956,272	952,038
Collateral Carrying Value		$ 1,036,807	$ 968,595
Weighted Average Note Rate (as a percent)		1.75%	1.48%
Unamortized deferred finance costs		$ 4,400	$ 600
Agency Business \| Fannie Mae Mortgage
Debt Obligations
Letters of Credit Outstanding, Amount		45,000
Agency Business \| Freddie Mac Mortgage
Debt Obligations
Committed amount		5,000
Letters of Credit Outstanding, Amount		5,000
Agency Business \| $200M credit facility
Debt Obligations
UPB		115,351	294,815
Debt Carrying Value		115,304	294,732
Collateral Carrying Value		$ 115,351	$ 296,698
Weighted Average Note Rate (as a percent)		1.60%	1.30%
Maximum borrowing capacity		$ 200,000
Agency Business \| $50M credit facility
Debt Obligations
Maximum borrowing capacity		$ 50,000
Fixed interest rate (as a percent)		2.875%
Variable rate, spread (as a percent)		1.30%
Agency Business \| $750M ASAP agreement
Debt Obligations
UPB		$ 182,130	$ 301,455
Debt Carrying Value		182,130	301,455
Collateral Carrying Value		$ 182,140	$ 302,491
Weighted Average Note Rate (as a percent)		1.40%	1.40%
Maximum borrowing capacity		$ 750,000
LIBOR Floor rate		0.25%
Debt Instrument, Reduced Basis Spread on Variable Rate		1.26%
Debt Instrument, Collateral Amount		$ 750,000
Agency Business \| $500M joint repurchase facility
Debt Obligations
UPB		399,470	$ 43,132
Debt Carrying Value		395,317	42,808
Collateral Carrying Value		$ 475,360	$ 56,186
Weighted Average Note Rate (as a percent)		2.11%	2.07%
Maximum borrowing capacity		$ 500,000
Agency Business \| $500M repurchase facility
Debt Obligations
UPB		236,527	$ 174,555
Debt Carrying Value		236,429	174,515
Collateral Carrying Value		$ 236,527	$ 174,555
Weighted Average Note Rate (as a percent)		1.58%	1.64%
Maximum borrowing capacity		$ 500,000
Agency Business \| $150M credit facility
Debt Obligations
UPB		16,657	$ 49,754
Debt Carrying Value		16,544	49,632
Collateral Carrying Value		$ 16,657	$ 49,754
Weighted Average Note Rate (as a percent)		1.51%	1.65%
Maximum borrowing capacity		$ 150,000
Agency Business \| $1.3M repurchase facility (2)
Debt Obligations
UPB		1,253
Debt Carrying Value		1,253
Collateral Carrying Value		$ 1,477
Weighted Average Note Rate (as a percent)		3.00%
Maximum borrowing capacity		$ 1,300
Agency Business \| $400M repurchase facility \| LIBOR
Debt Obligations
Maximum borrowing capacity		$ 500,000
Debt Instrument, Reduced Basis Spread on Variable Rate		1.48%