| Cover | Jan. 26, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 26, 2023 |
| Entity Registrant Name | Midland States Bancorp, Inc. |
| Entity Incorporation, State or Country Code | IL |
| Entity File Number | 001-35272 |
| Entity Tax Identification Number | 37-1233196 |
| Entity Address, Address Line One | 1201 Network Centre Drive |
| Entity Address, City or Town | Effingham |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 62401 |
| City Area Code | 217 |
| Local Phone Number | 342-7321 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001466026 |
