Variable Interest Entities and Collateralized Loan Obligations - Schedule of Borrowings and Corresponding Collateral (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($) loan	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) loan	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) loan
Debt Instrument [Line Items]
Count (in loans) \| loan	49		49		45
Interest expense	$ 45,524	$ 50,588	$ 88,667	$ 105,969
Amortization of debt issuance costs and discounts			3,344	4,820
Collateralized loan obligations
Debt Instrument [Line Items]
Interest expense	39,900	35,700	67,500	71,900
Amortization of deferred financing costs	700	$ 1,500		$ 2,900
Amortization of debt issuance costs and discounts			1,300
Collateralized loan obligations \| Collateral Assets
Debt Instrument [Line Items]
Outstanding principal balance	2,970,346		2,970,346		$ 2,254,612
Carrying value	$ 2,883,890		$ 2,883,890		$ 2,033,754
Collateralized loan obligations \| Collateral loan and REO investments
Debt Instrument [Line Items]
Count (in loans) \| loan	65		65		50
Wtd. avg. credit spread	3.58%		3.58%		3.75%
Wtd. avg. maturity			2 years 4 months 24 days		2 years
Collateralized loan obligations \| Debt
Debt Instrument [Line Items]
Count (in loans) \| loan	3		3		3
Outstanding principal balance	$ 2,452,377		$ 2,452,377		$ 1,682,288
Carrying value	$ 2,442,868		$ 2,442,868		$ 1,681,660
Wtd. avg. credit spread	1.94%		1.94%		2.02%
Wtd. avg. maturity			14 years 9 months 18 days		13 years 4 months 24 days
Collateralized loan obligations \| TRTX 2019-FL3 \| Collateral Assets
Debt Instrument [Line Items]
Outstanding principal balance					$ 311,381
Carrying value					$ 203,427
Collateralized loan obligations \| TRTX 2019-FL3 \| Collateral loan and REO investments
Debt Instrument [Line Items]
Count (in loans) \| loan					5
Wtd. avg. credit spread					3.68%
Wtd. avg. maturity					1 year
Loans held for investment, aggregate unpaid principal balance percentage					9.50%
Collateralized loan obligations \| TRTX 2019-FL3 \| Debt
Debt Instrument [Line Items]
Count (in loans) \| loan					1
Outstanding principal balance					$ 119,526
Carrying value					$ 119,526
Wtd. avg. credit spread					2.46%
Wtd. avg. maturity					9 years 9 months 18 days
Collateralized loan obligations \| TRTX 2021-FL4 \| Collateral Assets
Debt Instrument [Line Items]
Outstanding principal balance	$ 861,275		$ 861,275		$ 886,409
Carrying value	$ 811,738		$ 811,738		$ 796,552
Collateralized loan obligations \| TRTX 2021-FL4 \| Collateral loan and REO investments
Debt Instrument [Line Items]
Count (in loans) \| loan	20		20		19
Wtd. avg. credit spread	3.81%		3.81%		3.84%
Wtd. avg. maturity			1 year 9 months 18 days		2 years
Loans held for investment, aggregate unpaid principal balance percentage	19.60%		19.60%		27.00%
Collateralized loan obligations \| TRTX 2021-FL4 \| Debt
Debt Instrument [Line Items]
Count (in loans) \| loan	1		1		1
Outstanding principal balance	$ 648,775		$ 648,775		$ 673,909
Carrying value	$ 648,721		$ 648,721		$ 673,909
Wtd. avg. credit spread	1.96%		1.96%		1.93%
Wtd. avg. maturity			12 years 8 months 12 days		13 years 2 months 12 days
Collateralized loan obligations \| TRTX 2022-FL5 \| Collateral Assets
Debt Instrument [Line Items]
Outstanding principal balance	$ 1,009,071		$ 1,009,071
Carrying value	$ 986,611		$ 986,611
Collateralized loan obligations \| TRTX 2022-FL5 \| Collateralized loan obligations
Debt Instrument [Line Items]
Outstanding principal balance					$ 1,056,822
Carrying value					$ 1,033,775
Collateralized loan obligations \| TRTX 2022-FL5 \| Collateral loan and REO investments
Debt Instrument [Line Items]
Count (in loans) \| loan					26
Wtd. avg. credit spread					3.70%
Wtd. avg. maturity					2 years 1 month 6 days
Loans held for investment, aggregate unpaid principal balance percentage					32.20%
Collateralized loan obligations \| TRTX 2022-FL5 \| Collateral loan investments
Debt Instrument [Line Items]
Count (in loans) \| loan	25		25
Wtd. avg. credit spread	3.67%		3.67%
Wtd. avg. maturity			1 year 9 months 18 days
Loans held for investment, aggregate unpaid principal balance percentage	26.70%		26.70%
Collateralized loan obligations \| TRTX 2022-FL5 \| Debt
Debt Instrument [Line Items]
Count (in loans) \| loan	1		1		1
Outstanding principal balance	$ 841,102		$ 841,102		$ 888,853
Carrying value	$ 841,102		$ 841,102		$ 888,225
Wtd. avg. credit spread	2.04%		2.04%		2.02%
Wtd. avg. maturity			13 years 7 months 6 days		14 years 1 month 6 days
Collateralized loan obligations \| TRTX 2025-FL6 \| Collateralized loan obligations
Debt Instrument [Line Items]
Outstanding principal balance	$ 1,100,000		$ 1,100,000
Carrying value	$ 1,085,541		$ 1,085,541
Collateralized loan obligations \| TRTX 2025-FL6 \| Collateral loan investments
Debt Instrument [Line Items]
Count (in loans) \| loan	20		20
Wtd. avg. credit spread	3.34%		3.34%
Wtd. avg. maturity			3 years 3 months 18 days
Loans held for investment, aggregate unpaid principal balance percentage	29.00%		29.00%
Collateralized loan obligations \| TRTX 2025-FL6 \| Debt
Debt Instrument [Line Items]
Count (in loans) \| loan	1		1
Outstanding principal balance	$ 962,500		$ 962,500
Carrying value	$ 953,045		$ 953,045
Wtd. avg. credit spread	1.83%		1.83%
Wtd. avg. maturity			17 years 2 months 12 days