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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) item | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) item | Apr. 30, 2020 USD ($) | Nov. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Acquisition, conversion and other expenses | $ 325 | $ 889 |  |  |  |
Notional amount of interest rate swap | $ 856,491 |  | $ 943,623 |  |  |
Interest rate swap on variable rate loans |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Variable rate loan assets |  | $ 50,000 |  |  |  |
Interest rate swap on variable rate loans | London Interbank Offered Rate 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 |  |  |  |  |
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 |  |  |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of interest rate swap | 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 Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount of interest rate swap | 37,190 |  | 37,190 |  |  |
Designated as hedging instrument | Fair Value Hedging | 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 | $ 37,200 |  |
Fixed interest rate, weighted average |  |  |  | 1.696% |  |

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