Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document and Entity Information    
Entity Registrant Name MIDLAND STATES BANCORP, INC.  
Entity Central Index Key 0001466026  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Entity File Number 001-35272  
Title of 12(b) Security Common stock, $0.01 par value  
Entity Incorporation, State or Country Code IL  
Entity Tax Identification Number 37-1233196  
Entity Address, Postal Zip Code 62401  
Entity Address, Address Line One 1201 Network Centre Drive  
Entity Address, City or Town Effingham  
Entity Address, Country IL  
Local Phone Number 342-7321  
City Area Code 217  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Trading Symbol MSBI  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   24,363,400
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2