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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) item | Nov. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Acquisition, conversion and other expenses | $ 318 | $ 691 | $ 1,759 | $ 952 |  |  |  |  |
Notional amount of interest rate swap | $ 929,882 |  | $ 929,882 |  |  | $ 876,603 |  |  |
Interest rate swap on variable rate loans |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Variable rate loan assets |  |  |  |  | $ 50,000 |  |  |  |
Interest rate swap on variable rate loans | LIBOR less two days |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | 0.806% |  |  |  |
Interest rate swap on deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | item | 2 |  | 2 |  |  |  |  |  |
Term of interest rate swap |  |  | 5 years |  |  |  |  |  |
Fixed rate of interest rate swap |  |  |  |  |  |  | 0.59% |  | 1.53%
Notional amount of interest rate swap |  |  |  |  |  |  | $ 25,000 |  | $ 50,000
Designated as hedging instrument | Cash flow hedges |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | $ 125,000 |  | $ 125,000 |  |  | 75,000 |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | 75,000 |  | 75,000 |  |  | 75,000 |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on variable rate loans |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | 50,000 |  | 50,000 |  |  |  |  |  |
Designated as hedging instrument | Fair value hedges |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | 37,190 |  | 37,190 |  |  | 37,190 |  |  |
Designated as hedging instrument | Fair value hedges | Interest rate swap on deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | item |  |  |  |  |  |  |  | 8 |
Notional amount of interest rate swap | $ 37,190 |  | $ 37,190 |  |  | $ 37,190 |  | $ 37,200 |
Fixed interest rate, weighted average |  |  |  |  |  |  |  | 1.696% |

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