Loans Held for Investment and the Allowance for Credit Losses - Summary 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, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		$ 110,329	$ 1,006,831
Amortized cost basis of loans by origination year, Two		1,003,906	1,905,539
Amortized cost basis of loans by origination year, Three		1,722,599	289,315
Amortized cost basis of loans by origination year, Four		219,194	1,216,490
Amortized cost basis of loans by origination year, Five		1,108,206	508,957
Amortized cost basis of loans by origination year, prior		383,360	51,542
Amortized cost	[1]	4,547,594	4,978,674
Senior loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		110,329	1,006,831
Amortized cost basis of loans by origination year, Two		1,003,906	1,905,539
Amortized cost basis of loans by origination year, Three		1,722,599	289,315
Amortized cost basis of loans by origination year, Four		219,194	1,216,490
Amortized cost basis of loans by origination year, Five		1,108,206	508,957
Amortized cost basis of loans by origination year, prior		383,360	51,542
Amortized cost		4,547,594	4,978,674
Current-period write-offs, current fiscal year		0	0
Current-period write-offs, year before current fiscal year		0	0
Current-period write-offs, two years before current fiscal year		0	0
Current-period write-offs, three years before current fiscal year		0	0
Current-period write-offs, four years before current fiscal year		0	4,400
Current-period write-offs, more than Five Years before Current fiscal year		0	0
Write-off		0	(4,400)
1 | Senior loans
Accounts Notes And Loans 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 year, prior		0	0
Amortized cost		0	0
2 | Senior loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		0	22,732
Amortized cost basis of loans by origination year, Two		0	216,960
Amortized cost basis of loans by origination year, Three		227,987	0
Amortized cost basis of loans by origination year, Four		0	272,185
Amortized cost basis of loans by origination year, Five		211,726	0
Amortized cost basis of loans by origination year, prior		0	0
Amortized cost		439,713	511,877
3 | Senior loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		110,329	907,161
Amortized cost basis of loans by origination year, Two		926,847	1,609,556
Amortized cost basis of loans by origination year, Three		1,415,235	98,874
Amortized cost basis of loans by origination year, Four		100,022	505,377
Amortized cost basis of loans by origination year, Five		461,953	110,356
Amortized cost basis of loans by origination year, prior		86,027	0
Amortized cost		3,100,413	3,231,324
4 | Senior loans
Accounts Notes And Loans Receivable [Line Items]
Amortized cost basis of loans by origination year, One		0	76,938
Amortized cost basis of loans by origination year, Two		77,059	79,023
Amortized cost basis of loans by origination year, Three		79,377	119,172
Amortized cost basis of loans by origination year, Four		119,172	320,793
Amortized cost basis of loans by origination year, Five		101,872	342,869
Amortized cost basis of loans by origination year, prior		137,730	51,542
Amortized cost		515,210	990,337
5 | Senior loans
Accounts Notes And Loans 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	71,269
Amortized cost basis of loans by origination year, Four		0	118,135
Amortized cost basis of loans by origination year, Five		332,655	55,732
Amortized cost basis of loans by origination year, prior		159,603	0
Amortized cost		$ 492,258	$ 245,136

[1] The Company’s consolidated Total Assets and Total Liabilities as of June 30, 2023 include assets and liabilities of variable interest entities (“VIEs”) of $2.8 billion and $2.1 billion, respectively. The Company’s consolidated Total Assets and Total Liabilities as of December 31, 2022 include assets and liabilities of VIEs of $3.3 billion and $2.5 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.(2)Includes $28.0 million and $17.3 million of reserve for expected losses for unfunded loan commitments as of June 30, 2023 and December 31, 2022, respectively.