Summary of Significant Accounting Policies - Additional Information (Details)					3 Months Ended
		Mar. 31, 2022 USD ($) shares	Jun. 16, 2021 shares	Jun. 14, 2021 shares	Mar. 31, 2022 USD ($) Loan shares	Dec. 31, 2021 USD ($) shares	May 28, 2020
Significant Accounting Policies [Line Items]
Percentage of senior mortgage loan transferred to third-party					100.00%
Maximum insured amount of each cash account | $		$ 250,000			$ 250,000	$ 250,000
Cash | $		16,200,000			16,200,000	15,000,000.0
Cash and cash equivalents | $	[1]	351,572,000			351,572,000	260,635,000
Restricted cash | $	[1]	$ 847,000			$ 847,000	$ 404,000
Series B Preferred Stock
Significant Accounting Policies [Line Items]
Temporary equity, shares redeemed | shares			9,000,000
Temporary equity, shares outstanding | shares		0			0	0
Series C Preferred Stock
Significant Accounting Policies [Line Items]
Preferred stock, shares issued | shares		8,050,000		8,050,000	8,050,000	8,050,000
Preferred stock, dividend rate				6.25%
Commercial Real Estate Loans | Maximum
Significant Accounting Policies [Line Items]
Number of performance loan | Loan					120,000
Warrants
Significant Accounting Policies [Line Items]
Warrants expiration date							May 28, 2025
Warrants exercised | shares		0

[1] The Company’s consolidated Total Assets and Total Liabilities as of March 31, 2022 include assets and liabilities of variable interest entities (“VIEs”) of $3.4 billion and $2.8 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.