Repurchase Agreements, Loan Participations Sold, Net, Notes Payable, Net, Secured Term Loan, Net, Debt Related to Real Estate Owned, Net, and Acquisition Facility - Summary of Repurchase Agreements (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022		Dec. 31, 2021
Repurchase Agreement Counterparty [Line Items]
Repurchase agreements	$ 3,918,703		$ 3,489,511
Repurchase Agreement [Member]
Repurchase Agreement Counterparty [Line Items]
Maximum Capacity	4,786,171		4,336,171
Repurchase agreements	3,918,703		3,489,511
Undrawn Capacity	$ 867,468		$ 846,660
Repurchase Agreement [Member] | JP Morgan Chase Bank NA Main Pool [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	Jun. 29, 2025		Jun. 29, 2025	[1]
Fully Extended Maturity	Jun. 29, 2027	[2]	Jun. 29, 2027	[1]
Maximum Capacity	$ 1,500,000		$ 1,250,000	[1]
Repurchase agreements	1,355,946		1,173,280	[1]
Undrawn Capacity	$ 144,054		$ 76,720	[1]
Repurchase Agreement [Member] | JP Morgan Chase Bank NA Side Car [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	May 27, 2023		May 27, 2023
Fully Extended Maturity	May 27, 2024	[2]	May 27, 2024
Maximum Capacity	$ 271,171		$ 271,171
Repurchase agreements	215,397		215,003
Undrawn Capacity	$ 55,774		$ 56,168
Repurchase Agreement [Member] | Morgan Stanley Bank NA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	Jan. 26, 2023		Jan. 26, 2023	[3]
Fully Extended Maturity	Jan. 26, 2025	[2]	Jan. 26, 2024	[3]
Maximum Capacity	$ 1,000,000		$ 1,000,000	[3]
Repurchase agreements	840,996		$ 1,000,000	[3]
Undrawn Capacity	$ 159,004
Repurchase Agreement [Member] | Goldman Sachs Bank USA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	May 31, 2023		May 31, 2022
Fully Extended Maturity	May 31, 2025	[2]	May 31, 2023
Maximum Capacity	$ 500,000		$ 750,000
Repurchase agreements	393,398		410,551
Undrawn Capacity	$ 106,602		$ 339,449
Repurchase Agreement [Member] | Barclays Bank PLC [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	Dec. 20, 2022		Dec. 20, 2022
Fully Extended Maturity	Dec. 20, 2025	[2]	Dec. 20, 2025
Maximum Capacity	$ 500,000		$ 500,000
Repurchase agreements	186,383		193,884
Undrawn Capacity	$ 313,617		$ 306,116
Repurchase Agreement [Member] | Deutsche Bank AG New York Branch [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	Jun. 26, 2023		Jun. 26, 2022
Fully Extended Maturity	Jun. 26, 2023	[2]	Jun. 26, 2023
Maximum Capacity	$ 265,000		$ 265,000
Repurchase agreements	222,583		211,372
Undrawn Capacity	$ 42,417		$ 53,628
Repurchase Agreement [Member] | Wells Fargo Bank NA [Member]
Repurchase Agreement Counterparty [Line Items]
Initial Maturity	Sep. 29, 2023		Sep. 29, 2023
Fully Extended Maturity	Sep. 29, 2026	[2]	Sep. 29, 2026
Maximum Capacity	$ 750,000		$ 300,000
Repurchase agreements	704,000		285,421
Undrawn Capacity	$ 46,000		$ 14,579

[1] On January 14, 2022, the facility capacity was increased to $1.5 billion.

[2] Facility maturity dates may be extended based on certain conditions being met.

[3] On January 25, 2022, the reference rate on this facility was changed from LIBOR to SOFR, and the fully extended maturity was extended to January 26, 2025.