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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 01, 2022
USD ($)
banking_center
$ / shares
shares
Dec. 31, 2024
USD ($)
bankBranch
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Dec. 06, 2024
bankBranch
Mar. 31, 2022
Business Acquisition [Line Items]            
Gain on branch sale   $ 19,983 $ 0 $ 0    
Cash paid in acquisition   $ 0 0 79,324    
Demand and savings deposits     $ 299,800      
Series A Preferred Stock            
Business Acquisition [Line Items]            
Preferred Stock, issued (in shares) | shares   10,000 10,000      
Liquidation value per share (in dollars per share) | $ / shares   $ 2,500 $ 2,500      
Entity listing, depository receipt ratio 0.01          
Preferred Class B            
Business Acquisition [Line Items]            
Entity listing, depository receipt ratio 0.01          
Preferred Class B | Level One            
Business Acquisition [Line Items]            
Entity listing, depository receipt ratio           0.01
Level One            
Business Acquisition [Line Items]            
Acquired interest 100.00%          
Number of banking centers | banking_center 17          
Exchange ratio 0.7167          
Cash payment per share (in dollars per share) | $ / shares $ 10.17          
Cash paid in acquisition $ 79,300          
Other intangibles $ 18,642          
Operating revenue       56,900    
Provision expense related to CECL Day 1 adjustments       16,800    
Acquisition-related expenses, net of tax       $ 16,500    
Level One | Common Stock            
Business Acquisition [Line Items]            
Issuance of common stock related to acquisitions (in shares) | shares 5,600,000          
Level One | Series A Preferred Stock            
Business Acquisition [Line Items]            
Preferred Stock, issued (in shares) | shares 10,000          
Dividend rate, percentage 7.50%          
Liquidation value per share (in dollars per share) | $ / shares $ 2,500          
Level One | Other Intangible Assets            
Business Acquisition [Line Items]            
Other intangibles $ 18,600          
Level One | Core deposit intangible acquired            
Business Acquisition [Line Items]            
Other intangibles $ 17,200          
Estimated life 10 years          
Level One | Noncompete Agreements            
Business Acquisition [Line Items]            
Other intangibles $ 1,400          
Estimated life 2 years          
Sale            
Business Acquisition [Line Items]            
Demand and savings deposits   $ (267,400)        
Sale | Old Second National Bank Branch            
Business Acquisition [Line Items]            
Number of branches sold | bankBranch   5     5