| Document And Entity Information | Jan. 24, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 24, 2024 |
| Entity Registrant Name | EQUITY BANCSHARES, INC. |
| Entity Central Index Key | 0001227500 |
| Entity Emerging Growth Company | false |
| Securities Act File Number | 001-37624 |
| Entity Incorporation, State or Country Code | KS |
| Entity Tax Identification Number | 72-1532188 |
| Entity Address, Address Line One | 7701 East Kellogg Drive |
| Entity Address, Address Line Two | Suite 300 |
| Entity Address, City or Town | Wichita |
| Entity Address, State or Province | KS |
| Entity Address, Postal Zip Code | 67207 |
| City Area Code | 316 |
| Local Phone Number | 612.6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A, Common Stock, par value $0.01 per share |
| Trading Symbol | EQBK |
| Security Exchange Name | NYSE |
