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SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
SECURITIES          
Adjustment to carrying value of equity securities with no readily determinable fair value $ 0 $ 128 $ 0 $ 128  
Carrying value of securities pledged to secure public and trust deposits $ 349,412   $ 349,412   $ 284,895
Illinois          
SECURITIES          
Percentage of obligations of local municipalities     41.00%    
Percentage of general obligations in local municipalities     87.00%