Related Party Transactions - Additional Information (Details) - USD ($)				3 Months Ended
		Mar. 19, 2019	Jul. 25, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Proceeds from Issuance of Common Stock				$ 119,100,000
Incentive management fee percentage of Core Earnings less seven percent of stockholders equity			20.00%
Management fees and incentive management fees payable	[1]			6,486,000		$ 5,996,000
Amount incurred and reimbursable				300,000	$ 300,000
Reimbursable expenses remained outstanding				$ 0
Termination fee, description				A termination fee will be payable to the Manager upon termination of the Management Agreement by the Company absent a cause event. The termination fee would also be payable to the Manager upon termination of the Management Agreement by the Manager if the Company materially breaches the Management Agreement. The termination fee is equal to three times the sum of (x) the average annual base management fee and (y) the average annual incentive compensation earned by the Manager, in each case during the 24-month period immediately preceding the most recently completed calendar quarter prior to the date of termination or, if such termination occurs prior to July 25, 2019, and such termination fee is payable, the base management fees and the incentive compensation will be annualized for the period from July 25, 2017 to July 25, 2019 based on such fees actually received by the Manager during such period
Common Stock
Related Party Transaction [Line Items]
Proceeds from Issuance of Common Stock		$ 118,800,000
Issuance of Common Stock, Shares		6,000,000		6,000,000
Offering costs reimbursed by manager		$ 300,000
Management Agreement
Related Party Transaction [Line Items]
Percentage of annual base management fee			1.50%
Percentage of quarterly base management fee			0.375%
Proceeds from Issuance of Common Stock				$ 1,000,000,000
Incentive management fee, description				The Manager is entitled to incentive compensation which is calculated and payable in cash with respect to each calendar quarter following the completion of the Company’s initial public offering (or part thereof that the Management Agreement is in effect) in arrears in an amount, not less than zero, equal to the difference between: (1) the product of (a) 20% and (b) the difference between (i) the Company’s Core Earnings for the most recent 12-month period (or such lesser number of completed calendar quarters, if applicable), including the calendar quarter (or part thereof) for which the calculation of incentive compensation is being made (the “applicable period”), and (ii) the product of (A) the Company’s Equity in the most recent 12-month period (or such lesser number of completed calendar quarters, if applicable), including the applicable period, and (B) 7% per annum; and (2) the sum of any incentive compensation paid to the Manager with respect to the first three calendar quarters of the most recent 12-month period (or such lesser number of completed calendar quarters preceding the applicable period, if applicable). No incentive compensation is payable to the Manager with respect to any calendar quarter unless Core Earnings for the 12 most recently completed calendar quarters (or such lesser number of completed calendar quarters following the completion of the Company’s initial public offering) is greater than zero. For purposes of calculating the Manager’s incentive compensation, the Management Agreement, as amended, specifies that equity securities of the Company or any of the Company’s subsidiaries that are entitled to a specified periodic distribution or have other debt characteristics will not constitute equity securities and will not be included in “Equity” for the purpose of calculating incentive compensation. Instead, the aggregate distribution amount that accrues to such equity securities during the calendar quarter of such calculation will be subtracted from Core Earnings, before incentive compensation for purposes of calculating incentive compensation, unless such distribution is otherwise excluded from Core Earnings.
Percentage multiplied by stockholders equity included in incentive management fee			7.00%
Management fees and incentive management fees payable				$ 6,500,000		$ 6,100,000
Management Agreement | Minimum
Related Party Transaction [Line Items]
Management fee payable per annum			$ 250,000
Management fee payable per quarter			$ 62,500

[1] The Company’s consolidated Total Assets and Total Liabilities at March 31, 2019 include assets and liabilities of variable interest entities (“VIEs”) of $1.7 billion and $1.3 billion, respectively. The Company’s consolidated Total Assets and Total Liabilities at December 31, 2018 include assets and liabilities of VIEs of $1.9 billion and $1.5 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