Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Mar. 01, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Trading Symbol	CMTG
Entity Registrant Name	Claros Mortgage Trust, Inc.
Entity Central Index Key	0001666291
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		139,685,887
Entity Public Float	$ 2.1
ICFR Auditor Attestation Flag	false
Title of 12(b) Security	Common Stock, $0.01 par value per share
Entity File Number	001-40993
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	47-4074900
Security Exchange Name	NYSE
Entity Address, Address Line One	c/o Mack Real Estate Credit Strategies, L.P.
Entity Address, Address Line Two	60 Columbus Circle
Entity Address, Address Line Three	20th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10023
City Area Code	212
Local Phone Number	484-0050
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference [Text Block]	Portions of the definitive proxy statement to be filed with the Securities and Exchange Commission (“SEC”) pursuant to Regulation 14A relating to the registrant’s 2022 Annual Meeting of Stockholders will be incorporated by reference in this Form 10-K in response to Items 10, 11, 12, 13 and 14 of Part III.  The definitive proxy statement will be filed with the SEC no later than 120 days after the registrant’s fiscal year end.
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Boston, Massachusetts