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SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
SECURITIES    
Carrying value of securities pledged to secure public and trust deposits $ 1,434,858 $ 1,278,195
Assets Pledged    
SECURITIES    
Carrying value of securities pledged to secure public and trust deposits $ 394,000 $ 353,300
Illinois    
SECURITIES    
Percentage of obligations of local municipalities 49.00%  
Percentage of general obligations in local municipalities 81.00%