Investment Portfolio Financing - Summary of Secured Credit Agreements Secured by Mortgage Loan Investments, CRE Debt Securities and Counterparty Concentration Risks (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Repurchase Agreement Counterparty [Line Items]
Amount payable		$ 3,917,842
Accrued interest payable	[1]	4,300	$ 2,723
Unamortized deferred financing costs		12,600	10,300
Secured Credit Agreements and Secured Credit Facilities
Repurchase Agreement Counterparty [Line Items]
Commitment amount		2,849,546	3,072,901
Collateral (loans), outstanding principal		1,488,014	1,719,735
Amortized cost of collateral		1,488,842	1,719,489
Amount payable		1,092,105	1,167,323
Net counterparty exposure		$ 396,737	$ 552,165
Days to extended maturity		969 days	794 days
Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Accrued interest receivable		$ 6,800	$ 8,000
Premium, discount and origination fees		6,000	8,800
Accrued interest payable		2,500	1,100
Unamortized deferred financing costs		2,200	4,000
Goldman Sachs Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		500,000	250,000
Collateral (loans), outstanding principal		540,261	158,177
Amortized cost of collateral		542,450	159,269
Amount payable		406,732	96,389
Net counterparty exposure		$ 135,718	$ 62,880
Percent of stockholders' equity		9.40%	4.30%
Days to extended maturity		781 days	962 days
Wells Fargo | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		$ 500,000	$ 750,000
Collateral (loans), outstanding principal		515,891	779,791
Amortized cost of collateral		514,144	776,196
Amount payable		382,320	570,839
Net counterparty exposure		$ 131,824	$ 205,357
Percent of stockholders' equity		9.10%	14.00%
Days to extended maturity		1023 days	839 days
Barclays | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		$ 500,000	$ 750,000
Collateral (loans), outstanding principal		134,408	41,294
Amortized cost of collateral		133,922	41,019
Amount payable		100,648	23,330
Net counterparty exposure		$ 33,274	$ 17,689
Percent of stockholders' equity		2.30%	1.20%
Days to extended maturity		1505 days	590 days
Morgan Stanley Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		$ 500,000	$ 500,000
Collateral (loans), outstanding principal		75,661	255,125
Amortized cost of collateral		75,736	255,858
Amount payable		53,404	180,891
Net counterparty exposure		$ 22,332	$ 74,967
Percent of stockholders' equity		1.50%	5.10%
Days to extended maturity		308 days	489 days
JP Morgan Chase Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		$ 649,546	$ 649,546
Collateral (loans), outstanding principal		221,793	242,538
Amortized cost of collateral		222,590	243,181
Amount payable		149,001	133,191
Net counterparty exposure		$ 73,589	$ 109,990
Percent of stockholders' equity		5.10%	7.50%
Days to extended maturity		1218 days	1399 days
US Bank | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount			$ 44,730
Collateral (loans), outstanding principal			59,060
Amortized cost of collateral			59,435
Amount payable			34,035
Net counterparty exposure			$ 25,400
Percent of stockholders' equity			1.70%
Days to extended maturity			921 days
Bank of America | Commercial Mortgage Loans
Repurchase Agreement Counterparty [Line Items]
Commitment amount		$ 200,000	$ 128,625
Collateral (loans), outstanding principal		0	183,750
Amortized cost of collateral		0	184,531
Amount payable		0	128,648
Net counterparty exposure		$ 0	$ 55,883
Percent of stockholders' equity		0.00%	3.80%
Days to extended maturity		91 days	272 days

[1] The Company’s consolidated Total Assets and Total Liabilities as of June 30, 2022 include assets and liabilities of variable interest entities (“VIEs”) of $3.2 billion and $2.6 billion, respectively. The Company’s consolidated Total Assets and Total Liabilities as of December 31, 2021 include assets and liabilities of VIEs of $3.2 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.