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TRUST PREFERRED DEBENTURES - Summary of Trust Preferred Debentures (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 26, 2004
TRUST PREFERRED DEBENTURES      
Face amount $ 78,000 $ 94,000  
Trust preferred debentures 51,205 50,616  
Trust preferred debentures maturing January 23, 2034 | Grant Park Trust      
TRUST PREFERRED DEBENTURES      
Face amount $ 3,093    
Shares Issued 3    
Variable Rate 2.85%    
Trust preferred debentures $ 2,493 $ 2,454  
Interest rate (as a percent) 7.70% 8.52%  
Trust preferred debentures maturing April 23, 2034 | Midland Trust      
TRUST PREFERRED DEBENTURES      
Face amount $ 10,310   $ 10,300
Shares Issued 10    
Variable Rate 2.75%    
Trust preferred debentures $ 10,286 $ 10,284  
Interest rate (as a percent) 7.64% 8.42%  
Trust Preferred Debentures Maturing June 17, 2034 | Centrue Bank      
TRUST PREFERRED DEBENTURES      
Face amount $ 10,310    
Shares Issued 10    
Variable Rate 2.65%    
Trust preferred debentures $ 8,577 $ 8,468  
Interest rate (as a percent) 7.26% 8.32%  
Trust preferred debentures maturing December 31, 2036 | LSHC Trust III      
TRUST PREFERRED DEBENTURES      
Face amount $ 20,619    
Shares Issued 20    
Variable Rate 1.75%    
Trust preferred debentures $ 15,328 $ 15,110  
Interest rate (as a percent) 6.37% 7.42%  
Trust preferred debentures maturing September 6, 2037 | LSHC Trust IV      
TRUST PREFERRED DEBENTURES      
Face amount $ 20,619    
Shares Issued 20    
Variable Rate 1.47%    
Trust preferred debentures $ 14,521 $ 14,300  
Interest rate (as a percent) 6.18% 7.13%  
Total trust preferred debentures      
TRUST PREFERRED DEBENTURES      
Face amount $ 64,951    
Trust preferred debentures $ 51,205 $ 50,616