Secured Borrowings - Narrative (Details) $ in Thousands	1 Months Ended				12 Months Ended
	Feb. 28, 2022 USD ($)	Jan. 31, 2022 USD ($)	Jul. 31, 2021 USD ($) hotel	Apr. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2021 USD ($)	Aug. 31, 2019 USD ($)
Secured Borrowings
Principal amount of notes purchased by third-party investors			$ 210,100
RMBS
Secured Borrowings
Securitizations of loans			$ 230,000
Number of hotels | hotel			41
Morgan Stanley Bank, N.A.
Secured Borrowings
Amount at risk					$ 858,400
Weighted average extended maturities					3 years 8 months 12 days
Repurchase Agreements
Secured Borrowings
Percentage of repurchase agreements for which margin calls are limited to collateral specific credit marks					67.00%
Percentage of repurchase agreements containing margin call provisions for general capital market activity					33.00%
Percentage of repurchase agreements containing margin call provisions that pertain to loans held-for-sale					6.00%
Secured Borrowings
Secured Borrowings
Amortization of deferred financing costs					$ 40,700	$ 38,200	$ 35,600
Long term debt, gross					13,948,828	14,610,127
Residential Loans Credit Facility
Secured Borrowings
Maximum borrowing capacity					1,800,000
Residential Loans Credit Facility | Line of Credit
Secured Borrowings
Decrease (increase) in borrowing capacity, existing facilities					$ (87,900)
Decrease in weighted average spread					0.39%
Commercial Loans Repurchase Facility
Secured Borrowings
Maximum borrowing capacity					$ 63,400
Commercial Loans Repurchase Facility | Line of Credit
Secured Borrowings
Decrease (increase) in borrowing capacity, existing facilities					206,000
STWD 2022-FL3
Secured Borrowings
Face Amount	$ 1,000,000
Principal amount of notes purchased by third-party investors	842,500
Long term debt, gross	82,500
Liquidation preference	$ 75,000
CLO contribution period	2 years
Additional contribution to CLO					52,200	80,000
STWD 2021-FL2
Secured Borrowings
Face Amount								$ 1,300,000
Principal amount of notes purchased by third-party investors								1,100,000
Long term debt, gross								70,100
Liquidation preference								$ 127,500
Additional contribution to CLO					99,100	257,200	58,600
Repayments of debt					1,200
STWD 2019-FL1
Secured Borrowings
Face Amount									$ 1,100,000
Principal amount of notes purchased by third-party investors									936,400
Long term debt, gross									86,600
Liquidation preference									$ 77,000
Additional contribution to CLO							261,900
Repayments of debt					168,600	197,200
STWD 2021-SIF2
Secured Borrowings
Face Amount		$ 500,000
Principal amount of notes purchased by third-party investors		410,000
Liquidation preference		$ 90,000
CLO contribution period		3 years
Additional contribution to CLO					205,700	112,900
STWD 2021-SIF1
Secured Borrowings
Face Amount				$ 500,000
Principal amount of notes purchased by third-party investors				410,000
Liquidation preference				$ 90,000
CLO contribution period				3 years
Additional contribution to CLO					213,800	93,800	45,900
CLOs and SASB
Secured Borrowings
Amortization of deferred financing costs					8,700	10,500	$ 5,700
Incurred debt issuance costs					37,900
Deferred financing costs, net of amortization					$ 9,500	$ 18,200