Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands								3 Months Ended							9 Months Ended
	Sep. 12, 2023 USD ($) $ / shares	Sep. 11, 2023 USD ($) $ / shares	Sep. 08, 2023 USD ($) $ / shares	Sep. 08, 2022 USD ($)	Jun. 16, 2021 USD ($) shares	Jun. 14, 2021 USD ($) shares	May 28, 2020 USD ($) tranche $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares		Jun. 30, 2023 shares	Mar. 31, 2023 shares	Sep. 30, 2022 USD ($) shares	Jun. 30, 2022 shares	Mar. 31, 2022 shares	Sep. 30, 2023 USD ($) $ / shares shares		Sep. 30, 2022 USD ($)	Jun. 14, 2026	Dec. 31, 2022 USD ($)	[1]
Class Of Stock [Line Items]
Number of tranches | tranche							3
Dividends paid in cash	$ 18,700	$ 18,900
Dividends declared, not paid								$ 18,921	[1]			$ 18,711			$ 18,921	[1]	$ 18,711		$ 18,970
Subsequent Events
Class Of Stock [Line Items]
Minimum written notice																		30 days
Maximum written notice																		60 days
Maximum redeemable window																		120 days
Warrants
Class Of Stock [Line Items]
Strike price of common share for warrants outstanding (in USD per share) | $ / shares							$ 7.50	$ 7.02							$ 7.02
Warrants expiration date							May 28, 2025
Fair value of warrants							$ 14,400
Warrants exercised (in shares) | shares															0
Common Stock
Class Of Stock [Line Items]
Number of common shares issued | shares								4,208		316,572	3,724	3,239	217,536	1,953
Dividend payable (in USD per share) | $ / shares	$ 0.24	$ 0.24
Maximum
Class Of Stock [Line Items]
Taxable income distribution percentage															90.00%
PE Holder L.L.C | Investment Agreement | 2023
Class Of Stock [Line Items]
Warrants to purchase common stock							$ 225,000
PE Holder L.L.C | Investment Agreement | Maximum
Class Of Stock [Line Items]
Warrants to purchase common stock, authorized (in shares) | shares							15,000,000
Aggregate cash purchase price							$ 325,000
PE Holder L.L.C | Investment Agreement | Maximum | 2023
Class Of Stock [Line Items]
Warrants to purchase common stock (in shares) | shares							12,000,000
Series C Preferred Stock
Class Of Stock [Line Items]
Proceeds from issuance of Series C Cumulative Redeemable Preferred Stock						$ 194,400
Number of common shares issued | shares						8,050,000
Underwriting discount and commissions						$ 6,300
Issuance costs						$ 600
Liquidation preference (in USD per share) | $ / shares								$ 25.00							$ 25.00
Dividend percentage															6.25%
Liquidation preference (in USD per share annually) | $ / shares															$ 1.5624
Liquidation preference (in USD per share quarterly) | $ / shares															0.3906
Dividend payable (in USD per share) | $ / shares			$ 0.3906					0.4601							0.4601
Redemption price (in USD per share) | $ / shares								25.00							$ 25.00
Dividend rate (in percent)						6.25%
Dividends paid in cash			$ 3,100	$ 3,100
Dividends															$ 9,400		9,400
Series C Preferred Stock | TPG Capital BD, LLC
Class Of Stock [Line Items]
Payments for underwriting expense						$ 700
Series C Preferred Stock | Change of Control Event
Class Of Stock [Line Items]
Redemption price (in USD per share) | $ / shares								25.00							$ 25.00
Series B Preferred Stock
Class Of Stock [Line Items]
Liquidation preference (in USD per share) | $ / shares								25.00							$ 25.00
Dividend percentage															11.00%
Outstanding shares redeemed (in shares) | shares					9,000,000
Cash redemption of series B preferred stock					$ 247,500
Series B Preferred Stock | PE Holder L.L.C | Investment Agreement
Class Of Stock [Line Items]
Dividend percentage							11.00%
Shares authorized to issue and sell | shares							13,000,000
Par value (in USD per share) | $ / shares							$ 0.001
Series B Preferred Stock | PE Holder L.L.C | Investment Agreement | 2023
Class Of Stock [Line Items]
Shares issued | shares							9,000,000
Series A Preferred Stock
Class Of Stock [Line Items]
Dividend rate (in percent)															12.50%
Liquidation preference per annum (in USD per share) | $ / shares								$ 0.001							$ 0.001
Class A Common Stock
Class Of Stock [Line Items]
Dividends															$ 56,900		$ 56,100

[1] The Company’s consolidated Total Assets and Total Liabilities as of September 30, 2023 include assets and liabilities of variable interest entities (“VIEs”) of $2.6 billion and $2.0 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 $23.4 million and $17.3 million of reserve for expected losses for unfunded loan commitments as of September 30, 2023 and December 31, 2022, respectively.