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PREMISES AND EQUIPMENT - Additional information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Initial Leases And Lease Modifications And Renewals       $ 9,500,000
Lease expense related to ATMs $ 66,000 $ 62,000    
Weighted-average lease term P8Y      
Operating Lease, Weighted Average Discount Rate, Percent 3.24%      
Operating Lease, Expense $ 374,000 385,000    
Operating leases right of use asset 8,313,000   $ 8,536,000  
Lease liability 8,452,000   $ 8,700,000  
Income Recognized From Lessor Agreements $ 291,000 $ 299,000    
Minimum        
Lessee Expected Lease Terms P0Y6M      
Maximum        
Lessee Expected Lease Terms P17Y8M12D