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TRUST PREFERRED DEBENTURES - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jun. 09, 2017
Dec. 31, 2014
Jun. 05, 2013
Jun. 06, 2007
Nov. 30, 2006
Apr. 30, 2004
Mar. 26, 2004
Dec. 19, 2003
Centrue                
TRUST PREFERRED DEBENTURES                
Liquidation amount per security (in USD per share)           $ 1,000    
Book value of subordinated debentures $ 10,300              
Fair value of subordinated debentures 7,600              
Number of preferred securities issued (in shares)           10,000    
Midland Trust                
TRUST PREFERRED DEBENTURES                
Pool issued             $ 10,000  
Liquidation amount per security (in USD per share)             $ 1,000  
Midland Trust | Other assets                
TRUST PREFERRED DEBENTURES                
Investment in common stock             $ 300  
Midland Trust | Trust preferred debentures maturing April 23, 2034                
TRUST PREFERRED DEBENTURES                
Face amount             $ 10,300  
Midland Trust | Trust preferred debentures maturing April 23, 2034 | Centrue                
TRUST PREFERRED DEBENTURES                
Book value of subordinated debentures $ 10,310              
Grant Park Trust                
TRUST PREFERRED DEBENTURES                
Liquidation amount per security (in USD per share)               $ 1,000
Book value of subordinated debentures     $ 3,100          
Fair value of subordinated debentures     $ 1,800          
Number of preferred securities issued (in shares)               3,000
Grant Park Trust | Other assets                
TRUST PREFERRED DEBENTURES                
Investment in common stock               $ 100
Grant Park Trust | Trust preferred debentures maturing January 23, 2034                
TRUST PREFERRED DEBENTURES                
Face amount           $ 3,093   $ 3,100
LSHC Trust III                
TRUST PREFERRED DEBENTURES                
Liquidation amount per security (in USD per share)         $ 1,000      
Book value of subordinated debentures   $ 41,200            
Fair value of subordinated debentures   $ 26,100            
Number of preferred securities issued (in shares)         20,000      
LSHC Trust III | Trust preferred debentures maturing December 31, 2036                
TRUST PREFERRED DEBENTURES                
Face amount         $ 20,600 20,619    
LSHC Trust IV                
TRUST PREFERRED DEBENTURES                
Liquidation amount per security (in USD per share)       $ 1,000        
Number of preferred securities issued (in shares)       20,000        
LSHC Trust IV | Other assets                
TRUST PREFERRED DEBENTURES                
Investment in common stock       $ 1,200        
LSHC Trust IV | Trust preferred debentures maturing September 6, 2037                
TRUST PREFERRED DEBENTURES                
Face amount       $ 20,600   20,619    
Centrue Bank | Other assets                
TRUST PREFERRED DEBENTURES                
Investment in common stock           $ 300