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PREMISES AND EQUIPMENT - Additional information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Initial Leases And Lease Modifications And Renewals           $ 9,500,000
Lease expense related to ATMs $ 79,000 $ 76,000 $ 230,000 $ 202,000    
Weighted-average lease term     9.5 years      
Operating Lease, Weighted Average Discount Rate, Percent 3.44%   3.44%      
Operating Lease, Expense $ 386,000 397,000 $ 1,200,000 1,200,000    
Operating leases right of use asset 7,937,000   7,937,000   $ 8,536,000  
Lease liability 8,098,000   8,098,000   $ 8,700,000  
Income Recognized From Lessor Agreements $ 323,000 $ 294,000 $ 903,000 $ 864,000    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Accrued expenses and other liabilities   Accrued expenses and other liabilities   Accrued expenses and other liabilities  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant, and Equipment and Operating Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total   Property, Plant, and Equipment and Operating Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total   Property, Plant, and Equipment and Operating Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization, Total  
Minimum            
Lessee Expected Lease Terms     P1Y6M      
Maximum            
Lessee Expected Lease Terms     P17Y2M12D