v3.25.2
Cover Page - shares
 3 Months Ended
Mar. 31, 2025
Jul. 22, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 001-35272  
Entity Registrant Name MIDLAND STATES BANCORP, INC.  
Entity Incorporation, State or Country Code IL  
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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   21,535,199
Entity Central Index Key 0001466026  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Common stock    
Document Information [Line Items]    
Title of 12(b) Security Common stock, $0.01 par value  
Trading Symbol MSBI  
Security Exchange Name NASDAQ  
Depository Shares    
Document Information [Line Items]    
Title of 12(b) Security Depositary Shares, each representing a 1/40th interest in a share of 7.75% fixed rate reset non-cumulative perpetual preferred stock, Series A  
Trading Symbol MSBIP  
Security Exchange Name NASDAQ