Stockholders' Equity - Additional Information (Details) - USD ($)										3 Months Ended					6 Months Ended
	Jun. 30, 2021		Jun. 16, 2021	Jun. 14, 2021	Jun. 16, 2020	May 28, 2020	Mar. 23, 2020	Jan. 24, 2020	Mar. 07, 2019	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020	Dec. 31, 2020		Feb. 14, 2020
Class Of Stock [Line Items]
Preferred stock redemption make-whole payment										$ 22,485,000
Accretion of remaining unamortized discount										$ 23,997,000		$ 1,452,000	$ 443,000
Common stock, shares authorized	302,500,000									302,500,000					302,500,000			302,500,000
Common stock, shares outstanding	77,089,125									77,089,125					77,089,125			76,787,006
Proceeds from Issuance of Common Stock																	$ 12,895,000
Dividends paid in cash				$ 15,500,000	$ 15,400,000
Unpaid dividends	$ 15,500,000	[1]								$ 15,500,000	[1]		$ 48,669,000		$ 15,500,000	[1]	48,669,000	$ 29,481,000	[1]
Class A Shares Converted in to Common Stock
Class Of Stock [Line Items]
Common stock, shares issued								1,136,665
Common stock, shares authorized																				2,500,000
Warrants
Class Of Stock [Line Items]
Warrants to purchase common stock, value						$ 225,000,000.0
Strike price of common share for warrants outstanding						$ 7.50
Warrants expiration date						May 28, 2025
Fair value of warrants						$ 14,400,000
Warrants exercised	0
Common Stock
Class Of Stock [Line Items]
Number of common shares issued										192,023		110,096	160,278	628,218
Dividend declared per share				$ 0.20	$ 0.20
Dividends paid in cash															31,000,000.0		$ 48,700,000
Dividend declared date				Jun. 14, 2021	Jun. 16, 2020		Mar. 23, 2020
Dividend paid date				Jul. 23, 2021	Jul. 24, 2020		Jul. 14, 2020
Dividend record date				Jun. 28, 2021	Jun. 26, 2020
Dividend deferral payable date							Jul. 14, 2020
Dividend deferral record date							Jun. 15, 2020
Unpaid dividends	$ 15,500,000									$ 15,500,000					$ 15,500,000			$ 29,500,000
PE Holder L.L.C | Investment Agreement | Tranche One
Class Of Stock [Line Items]
Warrants to purchase common stock, value						$ 225,000,000.0
PE Holder L.L.C | Investment Agreement | Maximum
Class Of Stock [Line Items]
Warrants to purchase common stock, authorized						15,000,000
Aggregate cash purchase price						$ 325,000,000
PE Holder L.L.C | Investment Agreement | Maximum | Tranche One
Class Of Stock [Line Items]
Warrants to purchase common stock, shares						12,000,000
Equity Distribution Agreement | Common Stock
Class Of Stock [Line Items]
Number of common shares issued										0					0		600,000
Aggregate gross sales price of common stock	74,100,000									$ 74,100,000					$ 74,100,000
Proceeds from Issuance of Common Stock	$ 50,900,000																$ 12,900,000
Weighted average price per share																	$ 20.53
Payments for commissions																	$ 200,000
Equity Distribution Agreement | Maximum | Common Stock
Class Of Stock [Line Items]
Aggregate gross sales price of common stock									$ 125,000,000.0
Percentage of commission to each sales agent, on gross sales price of shares sold									1.75%
Series C Preferred Stock
Class Of Stock [Line Items]
Proceeds from Issuance of Preferred Stock				$ 194,400,000
Number of common shares issued				8,050,000
Underwriting discount and commissions				$ 6,300,000
Debt issuance costs, gross				$ 600,000
Temporary equity, liquidation preference per share	$ 25.00									$ 25.00					$ 25.00
Temporary equity, dividend percentage															6.25%
Dividend payable date															Sep. 30, 2021
Dividend declared per share	0.46									0.46					$ 0.46
Temporary equity, redemption terms															On and after June 14, 2026, the Company, at its option, upon not fewer than 30 days’ nor more than 60 days’ written notice, may redeem the Series C Preferred Stock, in whole, at any time, or in part, from time to time, for cash, at a redemption price of $25.00 per share, plus any accrued and unpaid dividends (whether or not declared) on such shares of Series C Preferred Stock to, but not including, the redemption date (other than any dividend with a record date before the applicable redemption date and a payment date after the applicable redemption date, which shall be paid on the payment date notwithstanding prior redemption of such shares.
Redemption price	$ 25.00									$ 25.00					$ 25.00
Dividend rate				6.25%
Preferred stock, liquidation preference per annum	$ 201,250,000									$ 201,250,000					$ 201,250,000
Series C Preferred Stock | Change of Control Event
Class Of Stock [Line Items]
Temporary equity, redemption terms															The Company, upon the occurrence of a Change of Control event, at its option, upon not fewer than 30 days’ nor more than 60 days’ written notice, may redeem the shares of Series C Preferred Stock, in whole or in part, within 120 days after the first date on which such Change of Control occurred, for cash at a redemption price equal to $25.00 per share, plus any accrued and unpaid dividends (whether or not declared) to, but not including, the redemption date (other than any dividend with a record date before the applicable redemption date and a payment date after the applicable redemption date, which will be paid on the payment date notwithstanding prior redemption of such shares).
Redemption price	$ 25.00									$ 25.00					$ 25.00
Series B Preferred Stock
Class Of Stock [Line Items]
Proceeds from Issuance of Preferred Stock																	210,598,000
Temporary equity, liquidation preference per share	$ 25.00									$ 25.00					$ 25.00
Temporary equity, dividend percentage						11.00%									11.00%
Dividend declared per share				$ 0.69	$ 0.25
Outstanding shares redeemed			9,000,000
Cash redemption of Series B preferred stock			$ 247,500,000
Temporary equity, shares outstanding	0		0							0					0
Preferred stock redemption make-whole payment			$ 22,500,000
Accretion of remaining unamortized discount			22,500,000
Issuance costs													$ 14,209,000
Unamortized transaction costs			11,200,000
Unaccreted discount related to Warrants written off			$ 11,300,000
Dividend declared date				Jun. 14, 2021	Jun. 16, 2020
Dividend paid date				Jun. 16, 2021	Jun. 30, 2020
Dividend record date				Jun. 15, 2021	Jun. 15, 2020
Dividends paid				$ 6,200,000	$ 2,300,000										$ 12,300,000		$ 2,300,000
Series B Preferred Stock | Warrants
Class Of Stock [Line Items]
Fair value of warrants						$ 14,400,000
Issuance costs						$ 14,200,000
Series B Preferred Stock | Maximum
Class Of Stock [Line Items]
Temporary equity liquidation preference percentage						2.00%
Series B Preferred Stock | PE Holder L.L.C | Investment Agreement
Class Of Stock [Line Items]
Temporary equity, dividend percentage						11.00%
Temporary equity, shares authorized						13,000,000
Temporary equity, par value						$ 0.001
Series B Preferred Stock | PE Holder L.L.C | Investment Agreement | Tranche One
Class Of Stock [Line Items]
Temporary equity, shares issued						9,000,000
Class A Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	0									0					0
Common stock, shares outstanding	0									0					0
Series A Preferred Stock
Class Of Stock [Line Items]
Dividend rate															12.50%
Preferred stock, liquidation preference per annum	$ 1,000.000									$ 1,000.000					$ 1,000.000

[1] The Company’s consolidated Total Assets and Total Liabilities as of June 30, 2021 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, 2020 include assets and liabilities of VIEs of $2.3 billion and $1.8 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 6 to the Consolidated Financial Statements for details