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SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
SECURITIES    
Carrying value of securities pledged to secure public and trust deposits $ 283,967 $ 308,064
Illinois    
SECURITIES    
Percentage of obligations of local municipalities 43.00%  
Percentage of general obligations in local municipalities 94.00%