| Document and Entity Information | Feb. 03, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 3, 2021 |
| Entity File Number | 001-38595 |
| Entity Registrant Name | FIRST WESTERN FINANCIAL, INC. |
| Entity Incorporation, State or Country Code | CO |
| Entity Tax Identification Number | 37-1442266 |
| Entity Address, Address Line One | 1900 16th Street, Suite 1200 |
| Entity Address, City or Town | Denver |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80202 |
| City Area Code | 303 |
| Local Phone Number | 531-8100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | MYFW |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001327607 |
| Amendment Flag | false |
