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Loans Held for Investment and the Allowance for Credit Losses - Schedule of Activity in Allowance for Credit Losses for Loans Held for Investment Portfolio by Class of Financing Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Allowance for credit losses for loans held for investment:          
Beginning balance, allowance for credit loss [1]     $ 74,503    
Allowance (reversal) for credit losses, net     11,850 $ 2,594  
Ending balance, allowance for credit loss [1] $ 73,955   73,955    
Allowance for credit losses on unfunded loan commitments:          
Beginning balance, allowance for credit loss     2,920    
Ending balance, allowance for credit loss 2,188   2,188    
Total allowance for credit losses 76,143 $ 66,132 76,143 66,132 $ 77,423
Allowance for credit losses excluded 800 700 800 700 $ 600
Senior loans          
Allowance for credit losses for loans held for investment:          
Beginning balance, allowance for credit loss 77,750 66,957 74,503 61,558  
Allowance (reversal) for credit losses, net 9,211 (2,413) 12,458 2,986  
Realized loss on loan write-off (13,006)   (13,006)    
Ending balance, allowance for credit loss 73,955 64,544 73,955 64,544  
Unfunded loan commitments          
Allowance for credit losses on unfunded loan commitments:          
Beginning balance, allowance for credit loss 2,930 1,819 2,920 2,415  
Reversal of credit losses, net (742) (231) (732) (827)  
Ending balance, allowance for credit loss $ 2,188 $ 1,588 $ 2,188 $ 1,588  
[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.