Variable Interest Entities and Collateralized Loan Obligations - Additional Information (Details) $ in Thousands	Feb. 17, 2022 USD ($) loan	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Oct. 11, 2021 USD ($)	Dec. 11, 2020 USD ($)
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Total loan commitment		$ 4,869,045	$ 5,429,146
FL2 Mortgage Assets
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Redemption of investment-grade bonds outstanding	$ 600,000
FL2 Mortgage Assets | Goldman, Sachs & Co.
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Loans and leases receivable unpaid principal balance	463,800
Total loan commitment	250,000
Borrowing	$ 359,100
FL5 Mortgage Assets
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Number of secured credit facilities | loan	17
Loans and leases receivable unpaid principal balance	$ 805,700
Collateralized loan obligations | TRTX 2022-FL5
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Deferred financing costs, including issuance, legal, and accounting related costs		$ 6,500
Collateralized loan obligations | TRTX 2021-FL4
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Deferred financing costs, including issuance, legal, and accounting related costs				$ 8,300
Collateralized loan obligations | TRTX 2019-FL3
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Deferred financing costs, including issuance, legal, and accounting related costs					$ 7,800
Collateralized loan obligations | FL2-Notes
Variable Interest Entities And Collateralized Loan Obligation [Line Items]
Deferred financing costs, including issuance, legal, and accounting related costs						$ 8,700