Commercial Mortgage-Backed Securities - Available-for-Sale Commercial Mortgage-Backed Securities by Contractual Maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Estimated Fair Value
Total investment in commercial mortgage-backed securities, at fair value	[1]	$ 85,895	$ 61,504
Commercial Mortgage-Backed Securities
Amortized Cost
After one, within five years		36,700	58,962
After five, within ten years		49,229	1,292
Total investment in commercial mortgage-backed securities, at fair value		85,929	60,254
Estimated Fair Value
After one, within five years		36,872	60,242
After five, within ten years		49,023	1,262
Total investment in commercial mortgage-backed securities, at fair value		$ 85,895	$ 61,504

[1] At December 31, 2017, there were no VIE assets or liabilities recorded in the Company’s Total Assets and Total Liabilities. The Company’s consolidated Total Assets and Total Liabilities at December 31, 2016 include VIE assets and liabilities of $743.5 million and $542.8 million, respectively. These assets were available only to satisfy obligations of the VIE, and creditors of the VIE had recourse only to those assets, and not to TPG RE Finance Trust, Inc. See Note 5 to the Consolidated Financial Statements for details