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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 30, 2020 USD ($) item | Nov. 30, 2019 USD ($) item | Mar. 31, 2019 USD ($) item | Dec. 31, 2014 USD ($) item
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Acquisition, conversion and other expenses |  |  | $ 5,801 | $ 8,317 | $ 1,728 |  |  |  |
Notional amount of interest rate swap | $ 876,603 | $ 580,372 | 876,603 | $ 580,372 |  |  |  |  |
Interest rate swap on deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | item |  |  |  |  |  | 1 | 2 | 2 |
Acquisition, conversion and other expenses | 3,900 |  |  |  |  |  |  |  |
Term of interest rate swap |  |  |  | 5 years |  |  |  |  |
Notional amount of interest rate swap | $ 50,000 |  | $ 50,000 |  |  | $ 25,000 | $ 50,000 | $ 50,000 |
Fixed interest rate, weighted average | 2.46% |  | 2.46% |  |  | 0.59% | 1.53% | 2.46% |
Cash flow hedges | Interest rate cap agreements |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | item |  |  |  |  |  |  |  |  | 4
Premiums paid |  |  |  |  |  |  |  |  | $ 4,600
Cap interest rate |  |  |  |  |  |  |  |  | 3.00%
Effective percentage interest rate, maximum |  |  |  |  |  |  |  |  | 3.00%
Acquisition, conversion and other expenses |  | 3,200 |  |  |  |  |  |  |
Fair Value Hedging | Interest rate swap on deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Number of Instruments Held | item | 8 |  | 8 |  |  |  |  |  |
Notional amount of interest rate swap | $ 37,200 |  | $ 37,200 |  |  |  |  |  |
Fixed interest rate, weighted average | 1.697% |  | 1.697% |  |  |  |  |  |
Designated as hedging instrument | Cash flow hedges |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | $ 75,000 | 100,000 | $ 75,000 | $ 100,000 |  |  |  |  |
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 deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap |  | 100,000 |  | 100,000 |  |  |  |  |
Designated as hedging instrument | Fair Value Hedging |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | 37,190 | 37,190 | 37,190 | 37,190 |  |  |  |  |
Designated as hedging instrument | Fair Value Hedging | Interest rate swap on deposits |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap | $ 37,190 | $ 37,190 | $ 37,190 | $ 37,190 |  |  |  |  |

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