| Document and Entity Information | Dec. 02, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001666291 |
| Document Type | 8-K |
| Document Period End Date | Dec. 2, 2021 |
| Entity Registrant Name | Claros Mortgage Trust, Inc. |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 001-40993 |
| Entity Tax Identification Number | 47-4074900 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value per share |
| Trading Symbol | CMTG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
