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DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Information Pertaining to Outstanding Interest Rate Swap Agreements (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Interest Rate Swap, 3 month LIBOR plus 1.67% |  |
Derivative [Line Items] |  |
Notional Amount |  | $ 2,000,000
Pay Rate |  | 5.979%
Effective Date |  | Oct. 01, 2016
Maturity in Years |  | 5 years 3 months
Unrealized Losses |  | $ 408,000
Interest Rate Swap, 3 month LIBOR plus 1.67% | LIBOR |  |
Derivative [Line Items] |  |
Receive Rate |  | 1.67%
Interest Rate Swap, 3 month LIBOR plus 3.35% |  |
Derivative [Line Items] |  |
Notional Amount |  | $ 3,000,000
Pay Rate |  | 7.505%
Effective Date |  | Oct. 30, 2012
Maturity in Years |  | 1 year 9 months 29 days
Unrealized Losses |  | $ 221,000
Interest Rate Swap, 3 month LIBOR plus 3.35% | LIBOR |  |
Derivative [Line Items] |  |
Receive Rate |  | 3.35%
Interest Rate Swap, 3 month LIBOR |  |
Derivative [Line Items] |  |
Notional Amount | $ 15,000,000 | $ 15,000,000
Pay Rate | 0.668% | 0.668%
Effective Date | Mar. 18, 2020 | Mar. 18, 2020
Maturity in Years | 1 year 5 months 19 days | 2 years 2 months 19 days
Unrealized Losses | $ 93,000 | $ 159,000
Interest Rate Swap, 3 month LIBOR |  |
Derivative [Line Items] |  |
Notional Amount | $ 15,000,000 | $ 15,000,000
Pay Rate | 0.79% | 0.79%
Effective Date | Mar. 18, 2020 | Mar. 18, 2020
Maturity in Years | 3 years 5 months 19 days | 4 years 2 months 19 days
Unrealized Losses | $ 17,000 | $ 288,000
Interest Rate Swap, 3 month LIBOR |  |
Derivative [Line Items] |  |
Notional Amount | $ 10,000,000 | $ 10,000,000
Pay Rate | 0.53% | 0.53%
Effective Date | Mar. 23, 2020 | Mar. 23, 2020
Maturity in Years | 1 year 5 months 23 days | 2 years 2 months 23 days
Unrealized Losses | $ 41,000 | $ 75,000

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