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DERIVATIVES (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivatives, Fair Value [Line Items] |  |  |
Carrying Amount of Hedged Asset/(Liabilities) | $ 50,000 |  | $ 50,000
Cash Flow Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gain (loss) within accumulated other comprehensive income, to be reclassified into earnings |  | $ (1,800) |
Derivative, amount | 200,000 |  |
Fair Value Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate notional amount of the hedged items | 89,800 |  | 74,700
Fair value of aggregate notional amount of the hedged items, unrealized loss | 1,200 |  | 5,100
Loans |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Carrying Amount of Hedged Asset/(Liabilities) | 89,792 |  | 74,726
Cumulative Amount of Basis Adjustments Included in the Carrying Amount of the Hedged Asset/(Liabilities) | 1,170 |  | 5,088
Available-for-sale Securities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of aggregate notional amount of the hedged items, unrealized loss | 5,000 |  | 7,300
Carrying Amount of Hedged Asset/(Liabilities) | 122,522 |  | 166,413
Cumulative Amount of Basis Adjustments Included in the Carrying Amount of the Hedged Asset/(Liabilities) | 4,993 |  | 7,297
Available-for-sale Securities | Fair Value Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate notional amount of the hedged items | 50,000 |  | 50,000
Fair value of aggregate notional amount of the hedged items, unrealized loss | $ 5,000 |  | $ 7,300

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