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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Nov. 30, 2019
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 929,882 | $ 876,603 |  |  |
Fair Value Asset (Liability) | (2,223) | (5,526) |  |  |
Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  | $ 25,000 |  | $ 50,000
Designated as hedging instrument | Cash flow hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 125,000 | 75,000 |  |  |
Fair Value Asset (Liability) | (1,289) | (2,664) |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 75,000 | $ 75,000 |  |  |
Weighted Average Maturity (in years) | 3 years 3 months 18 days | 4 years |  |  |
Fair Value Asset (Liability) | $ (1,168) | $ (2,664) |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 50,000 |  |  |  |
Weighted Average Maturity (in years) | 4 years 6 months |  |  |  |
Fair Value Asset (Liability) | $ (121) |  |  |  |
Designated as hedging instrument | Fair value hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 37,190 | 37,190 |  |  |
Fair Value Asset (Liability) | (841) | (2,789) |  |  |
Designated as hedging instrument | Fair value hedges | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 37,190 | $ 37,190 |  | $ 37,200 |
Weighted Average Maturity (in years) | 7 years 9 months 18 days | 8 years 7 months 6 days |  |  |
Fair Value Asset (Liability) | $ (841) | $ (2,789) |  |  |
Hedged Asset, Fair Value Hedge | 39,200 | 40,209 |  |  |
Cumulative amount of fair value hedging adjustment in carrying amount | 2,010 | 3,019 |  |  |
Designated as hedging instrument | Economic hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 754,807 | 761,093 |  |  |
Fair Value Asset (Liability) | (140) | (95) |  |  |
Designated as hedging instrument | Economic hedges | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 14,533 | $ 50,629 |  |  |
Weighted Average Maturity (in years) | 1 month 6 days | 2 months 12 days |  |  |
Fair Value Asset (Liability) | $ (140) | $ (95) |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | MNA counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 250,852 | $ 235,947 |  |  |
Weighted Average Maturity (in years) | 6 years 4 months 24 days | 6 years 9 months 18 days |  |  |
Fair Value Asset (Liability) | $ (10,258) | $ (15,938) |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | RPA counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 119,285 | $ 119,285 |  |  |
Weighted Average Maturity (in years) | 7 years 1 month 6 days | 7 years 10 months 24 days |  |  |
Fair Value Asset (Liability) | $ (5,892) | $ (9,957) |  |  |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | Customer |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 370,137 | $ 355,232 |  |  |
Weighted Average Maturity (in years) | 6 years 7 months 6 days | 7 years 1 month 6 days |  |  |
Fair Value Asset (Liability) | $ 16,150 | $ 25,895 |  |  |
Not designated as hedging instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 12,885 | 3,320 |  |  |
Fair Value Asset (Liability) | 47 | 22 |  |  |
Not designated as hedging instrument | Interest rate lock commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 12,885 | $ 3,320 |  |  |
Weighted Average Maturity (in years) | 1 month 6 days | 1 month 6 days |  |  |
Fair Value Asset (Liability) | $ 47 | $ 22 |  |  |

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