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SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SECURITIES    
Adjustment to carrying value of equity securities with no readily determinable fair value $ 165  
Carrying value of securities pledged to secure public and trust deposits $ 284,895 $ 291,404
Illinois    
SECURITIES    
Percentage of obligations of local municipalities 51.00%  
Percentage of general obligations in local municipalities 88.00%