Investment Portfolio Financing - Summary of Secured Credit Agreements Secured by Mortgage Loan Investments, CRE Debt Securities and Counterparty Concentration Risks (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended	12 Months Ended
		Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Repurchase Agreement Counterparty [Line Items]
Amount payable			$ 3,705,887
Accrued interest payable	[1]		10,468	$ 11,080
Unamortized deferred financing costs			6,600	9,000
Secured Credit Agreements and Secured Credit Facilities
Repurchase Agreement Counterparty [Line Items]
Commitment amount			2,849,546	2,849,546
Collateral (loans), outstanding principal			1,409,074	1,557,248
Amortized cost of collateral			1,415,854	1,561,097
Amount payable			1,042,029	1,111,086
Net counterparty exposure			$ 373,825	450,011
Days to extended maturity		757 days	651 days
Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Accrued interest receivable			$ 10,000	8,300
Premium, discount and origination fees			3,300	4,400
Accrued interest payable			2,800	2,700
Unamortized deferred financing costs			2,100	2,800
Goldman Sachs Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			500,000	500,000
Collateral (loans), outstanding principal			420,633	595,576
Amortized cost of collateral			422,190	596,838
Amount payable			324,906	386,124
Net counterparty exposure			$ 97,284	$ 210,714
Percent of stockholders' equity			8.00%	15.90%
Days to extended maturity		597 days	416 days
Wells Fargo | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 500,000	$ 500,000
Collateral (loans), outstanding principal			598,319	544,557
Amortized cost of collateral			600,568	544,824
Amount payable			436,727	422,870
Net counterparty exposure			$ 163,841	$ 121,954
Percent of stockholders' equity			13.40%	9.20%
Days to extended maturity		839 days	658 days
Barclays | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 500,000	$ 500,000
Collateral (loans), outstanding principal			180,188	129,049
Amortized cost of collateral			180,834	128,900
Amount payable			133,060	97,215
Net counterparty exposure			$ 47,774	$ 31,685
Percent of stockholders' equity			3.90%	2.40%
Days to extended maturity		1321 days	1140 days
Morgan Stanley Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 500,000	$ 500,000
Collateral (loans), outstanding principal			80,587	79,103
Amortized cost of collateral			81,339	79,935
Amount payable			54,029	55,798
Net counterparty exposure			$ 27,310	$ 24,137
Percent of stockholders' equity			2.20%	1.80%
Days to extended maturity		124 days	309 days
JP Morgan Chase Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 649,546	$ 649,546
Collateral (loans), outstanding principal			80,329	161,143
Amortized cost of collateral			81,808	162,328
Amount payable			57,422	113,197
Net counterparty exposure			$ 24,386	$ 49,131
Percent of stockholders' equity			2.00%	3.70%
Days to extended maturity		1034 days	853 days
Bank of America | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 200,000	$ 200,000
Collateral (loans), outstanding principal			49,018	47,820
Amortized cost of collateral			49,115	48,272
Amount payable			35,885	35,882
Net counterparty exposure			$ 13,230	$ 12,390
Percent of stockholders' equity			1.10%	0.90%
Days to extended maturity		90 days	1072 days

[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.