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SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 $ 308,064 $ 284,895
Illinois    
SECURITIES    
Percentage of obligations of local municipalities 41.00%  
Percentage of general obligations in local municipalities 75.00%