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Loans Held for Investment and the Allowance for Credit Losses - Schedule of Amortized Cost By Origination Year Grouped By Risk Rating for Loans Held for Investment Portfolio (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost [1] $ 4,321,538 $ 4,103,022
Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 585,380 1,771,785
Amortized cost basis of loans by origination, year two 1,751,089 536,907
Amortized cost basis of loans by origination, year three 538,620 101,712
Amortized cost basis of loans by origination, year four 61,483 493,555
Amortized cost basis of loans by origination, year five 496,783 801,972
Amortized cost basis of loans by origination, prior 888,183 397,091
Amortized cost 4,321,538 4,103,022
Current-period realized loss on loan sales and REO conversions, year one 0 0
Current-period realized loss on loan sales and REO conversions, year two 0 0
Current-period realized loss on loan sales and REO conversions, year three 0 0
Current-period realized loss on loan sales and REO conversions, year four 0 0
Current-period realized loss on loan sales and REO conversions, year five 0 0
Current-period realized loss on loan sales and REO conversions, prior 0 0
Current-period realized loss on loan write-offs related to REO conversions 0 0
1 | Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 0 0
Amortized cost basis of loans by origination, year two 0 0
Amortized cost basis of loans by origination, year three 0 0
Amortized cost basis of loans by origination, year four 0 0
Amortized cost basis of loans by origination, year five 0 0
Amortized cost basis of loans by origination, prior 0 0
Amortized cost 0 0
2 | Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 0 0
Amortized cost basis of loans by origination, year two 0 110,641
Amortized cost basis of loans by origination, year three 111,198 58,591
Amortized cost basis of loans by origination, year four 61,483 0
Amortized cost basis of loans by origination, year five 0 0
Amortized cost basis of loans by origination, prior 0 0
Amortized cost 172,681 169,232
3 | Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 585,380 1,771,785
Amortized cost basis of loans by origination, year two 1,751,089 426,266
Amortized cost basis of loans by origination, year three 427,422 43,121
Amortized cost basis of loans by origination, year four 0 452,592
Amortized cost basis of loans by origination, year five 454,261 801,972
Amortized cost basis of loans by origination, prior 768,425 278,108
Amortized cost 3,986,577 3,773,844
4 | Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 0 0
Amortized cost basis of loans by origination, year two 0 0
Amortized cost basis of loans by origination, year three 0 0
Amortized cost basis of loans by origination, year four 0 40,963
Amortized cost basis of loans by origination, year five 42,522 0
Amortized cost basis of loans by origination, prior 119,758 118,983
Amortized cost 162,280 159,946
5 | Senior loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amortized cost basis of loans by origination, year one 0 0
Amortized cost basis of loans by origination, year two 0 0
Amortized cost basis of loans by origination, year three 0 0
Amortized cost basis of loans by origination, year four 0 0
Amortized cost basis of loans by origination, year five 0 0
Amortized cost basis of loans by origination, prior 0 0
Amortized cost $ 0 $ 0
[1] The Company’s consolidated Total Assets and Total Liabilities as of June 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.