Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended
	Apr. 25, 2019 USD ($) $ / shares	Apr. 16, 2019 USD ($) shares	Mar. 19, 2019 USD ($) $ / shares	Apr. 29, 2019 USD ($) Loan Investment	Mar. 31, 2019 USD ($) Rating Investment		Apr. 12, 2019 shares	Dec. 31, 2018 USD ($) Rating		Mar. 31, 2018 USD ($)	Mar. 19, 2018 $ / shares
Subsequent Event [Line Items]
Loan commitment amount					$ 5,373,671			$ 4,947,749
Weighted Average Risk Rating | Rating					2.8			2.8
Proceeds from issuance of common stock					$ 119,100
Dividends Payable			$ 31,600		$ 31,598	[1]		$ 28,981	[1]	$ 25,307
Common Stock
Subsequent Event [Line Items]
Proceeds from issuance of common stock			$ 118,800
Dividend amount per share | $ / shares			$ 0.43								$ 0.42
CRE CLO Investments
Subsequent Event [Line Items]
Number of floating rate investment purchased | Investment					10
Foating rate investment purchased					$ 234,200
weighted average coupon rate					2.20%
Senior Mortgage Loan
Subsequent Event [Line Items]
Weighted Average Risk Rating | Rating					3
Subsequent Events | Common Stock
Subsequent Event [Line Items]
Dividend payable date	Apr. 25, 2019
Dividend record date	Mar. 29, 2019
Dividend amount per share | $ / shares	$ 0.43
Dividends Payable	$ 31,600
Subsequent Events | Morgan Stanley & Co. LLC | Exercise of Underwriters Option to Purchase Additional Shares
Subsequent Event [Line Items]
Exercise of underwriters stock option to purchase additional shares | shares							900,000
Additional shares of common stock sold to the underwriters | shares		900,000
Proceeds from issuance of common stock		$ 17,400
Subsequent Events | CRE CLO Investments
Subsequent Event [Line Items]
Number of floating rate investment purchased | Investment				6
Foating rate investment purchased				$ 98,900
weighted average coupon rate				2.40%
Subsequent Events | Senior Mortgage Loan
Subsequent Event [Line Items]
Number of first mortgage loans closed | Loan				6
Loan commitment amount				$ 613,700
Number of first mortgage loans repayments | Loan				1
Loan repayments related to mortgage loans, loan commitment				$ 63,200
Loan repayments related to mortgage loans, unpaid principal				$ 57,300

[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