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Investment Portfolio Financing Arrangements - Schedule of Secured Credit Agreements Secured by Mortgage Loan Investments, CRE Debt Securities and Counterparty Concentration Risks (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Repurchase Agreement Counterparty [Line Items]    
Accrued interest payable [1] $ 6,441 $ 6,751
Unamortized deferred financing costs 11,400 13,700
Secured Credit Agreements and Secured Credit Facilities    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount 2,300,000 1,700,000
UPB of collateral 2,132,371 785,701
Amortized cost of collateral 2,132,113 787,006
Amount payable 1,524,524 592,173
Net counterparty exposure $ 607,589 $ 194,833
Days to extended maturity 1125 days 1473 days
Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Accrued interest and fees receivable $ 7,400 $ 4,400
Premium, discount and origination fees 7,700 3,100
Accrued interest payable 2,400 900
Unamortized deferred financing costs 3,000 1,600
Goldman Sachs Bank | Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount 750,000 500,000
UPB of collateral 781,103 499,717
Amortized cost of collateral 779,856 502,259
Amount payable 585,021 370,474
Net counterparty exposure $ 194,835 $ 131,785
Percent of stockholders' equity 19.00% 12.30%
Days to extended maturity 1874 days 2147 days
Wells Fargo | Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount $ 850,000 $ 500,000
UPB of collateral 963,402 104,245
Amortized cost of collateral 964,167 103,857
Amount payable 634,700 76,246
Net counterparty exposure $ 329,467 $ 27,611
Percent of stockholders' equity 32.20% 2.60%
Days to extended maturity 590 days 705 days
Citi | Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount $ 500,000  
UPB of collateral 200,923  
Amortized cost of collateral 201,090  
Amount payable 159,197  
Net counterparty exposure $ 41,893  
Percent of stockholders' equity 4.10%  
Days to extended maturity 639 days  
Barclays | Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount   $ 500,000
UPB of collateral   0
Amortized cost of collateral   0
Amount payable   0
Net counterparty exposure   $ 0
Percent of stockholders' equity   0.00%
Days to extended maturity   225 days
Bank of America | Commercial Mortgage Loans    
Repurchase Agreement Counterparty [Line Items]    
Commitment amount $ 200,000 $ 200,000
UPB of collateral 186,943 181,739
Amortized cost of collateral 187,000 180,890
Amount payable 145,606 145,453
Net counterparty exposure $ 41,394 $ 35,437
Percent of stockholders' equity 4.00% 3.30%
Days to extended maturity 980 days 157 days
[1] The Company’s consolidated Total Assets and Total Liabilities as of September 30, 2026 include assets and liabilities of variable interest entities (“VIEs”) of $2.3 billion and $1.9 billion, respectively. The Company’s consolidated Total Assets and Total Liabilities as of December 31, 2025 include assets and liabilities of VIEs of $3.1 billion and $2.6 billion, respectively. These assets can be used only to satisfy obligations of the VIEs, and creditors of the VIEs have recourse only to these assets, and not to TPG RE Finance Trust, Inc. See Note 5 to the Consolidated Financial Statements for details.