| Cover Cover | Oct. 22, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 25, 2021 |
| Entity Registrant Name | HOMESTREET, INC. |
| Entity Incorporation, State or Country Code | WA |
| Entity File Number | 001-35424 |
| Entity Tax Identification Number | 91-0186600 |
| Entity Address, Address Line One | 601 Union Street |
| Entity Address, Address Line Two | Ste. 2000 |
| Entity Address, City or Town | Seattle |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98101 |
| City Area Code | 206 |
| Local Phone Number | 623-3050 |
| 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 | HMST |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001518715 |
| Amendment Flag | false |
