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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 |  |  |

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