v3.26.1
OTHER BORROWINGS - Additional Information (Details) - USD ($)
$ in Thousands
Jan. 29, 2026
Jun. 30, 2026
Dec. 31, 2025
Feb. 15, 2022
Debt Instrument [Line Items]        
Leveraged loans, compliance period (in years)   7 years    
Other borrowings   $ 20,290 $ 25,798  
Subordinated Debt | First Midwest        
Debt Instrument [Line Items]        
Debt assumed       $ 150,000
Fixed rates       5.875%
Subordinated Notes Maturing January 2026 | Subordinated Debt        
Debt Instrument [Line Items]        
Issuance amount $ 450,000      
Interest rate 5.768%      
Variable rate 2.20%