Stockholders' Equity - Additional Information (Details) - USD ($)										3 Months Ended
	Mar. 31, 2022		Mar. 15, 2022	Mar. 14, 2022	Mar. 08, 2022	Jun. 16, 2021	Jun. 14, 2021	May 28, 2020	Mar. 07, 2019	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021
Class Of Stock [Line Items]
Accretion of remaining unamortized discount												$ 1,452,000
Common stock, shares authorized	302,500,000									302,500,000			302,500,000
Common stock, shares outstanding	77,185,845									77,185,845			77,183,892
Dividends paid in cash			$ 15,500,000	$ 18,700,000
Unpaid dividends	$ 18,701,000	[1]								$ 18,701,000	[1]	$ 15,510,000	$ 24,156,000	[1]
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										1,953		110,096
Dividend declared per share			$ 0.20	$ 0.24
Dividend declared date			Mar. 15, 2021	Mar. 14, 2022
Dividend paid date			Apr. 23, 2021	Apr. 25, 2022
Dividend record date			Mar. 26, 2021	Mar. 29, 2022
Maximum
Class Of Stock [Line Items]
Temporary equity taxable income percentage										90.00%
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
Aggregate gross sales price of common stock	$ 74,100,000									$ 74,100,000
Proceeds from issuance of common stock										$ 50,900,000
Equity Distribution Agreement | Maximum | Common Stock
Class Of Stock [Line Items]
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
Issuance costs							$ 600,000
Temporary equity, liquidation preference per share	$ 25.00									$ 25.00
Temporary equity liquidation preference per share annually										1.5624
Temporary equity liquidation preference per share quarterly										$ 0.3906
Temporary equity, dividend percentage										6.25%
Dividend declared per share	0.4601				$ 0.3906					$ 0.4601
Dividend payable date										Sep. 30, 2021
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
Dividend rate							6.25%
Preferred stock, liquidation preference per annum	$ 201,250,000									$ 201,250,000			$ 201,250,000
Dividends paid in cash					$ 3,100,000
Dividend declared date					Mar. 08, 2022
Dividend paid date					Mar. 30, 2022
Dividend record date					Mar. 18, 2022
Series C Preferred Stock | TPG Capital BD, LLC
Class Of Stock [Line Items]
Payments For Underwriting Expense										$ 700,000
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
Series B Preferred Stock
Class Of Stock [Line Items]
Temporary equity, liquidation preference per share	$ 25.00									$ 25.00
Temporary equity, dividend percentage								11.00%		11.00%
Dividend declared per share			$ 0.68
Dividend payable date			Mar. 15, 2021
Temporary equity, shares authorized	13,000,000									13,000,000			13,000,000
Temporary equity, par value	$ 0.001									$ 0.001			$ 0.001
Temporary equity, shares issued	0									0			0
Outstanding shares redeemed						9,000,000
Cash redemption of Series B preferred stock						$ 247,500,000
Temporary equity, shares outstanding	0									0			0
Dividends paid in cash			$ 6,100
Dividend paid date			Mar. 31, 2021
Dividend record date			Mar. 15, 2021
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
Series A Preferred Stock
Class Of Stock [Line Items]
Dividend rate										12.50%
Preferred stock, liquidation preference per annum	$ 125,000									$ 125,000			$ 125,000
Preferred stock, liquidation preference per annum	$ 0.001									$ 0.001

[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.