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FHLB ADVANCES AND OTHER BORROWINGS - Summary of FHLB Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
FHLB ADVANCES AND OTHER BORROWINGS    
Total FHLB advances and other borrowings $ 258,000 $ 476,000
FHLB advances, collateral for mortgage and home equity line of credit loans 3,230,000 2,980,000
Line of credit facility, maximum borrowing capacity 1,290,000  
Midland States Bank | Fixed rate fixed term maturing October 2029    
FHLB ADVANCES AND OTHER BORROWINGS    
Total FHLB advances and other borrowings $ 133,000 $ 150,000
Interest rate 4.50% 4.94%
Midland States Bank | Putable fixed rate maturing through May 2029    
FHLB ADVANCES AND OTHER BORROWINGS    
Total FHLB advances and other borrowings $ 125,000 $ 160,000
Interest rate 3.69% 3.07%
Midland States Bank | Short term fixed rate matured December 2024    
FHLB ADVANCES AND OTHER BORROWINGS    
Total FHLB advances and other borrowings $ 0 $ 166,000
Interest rate   5.45%