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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014
Derivative [Line Items] |  |  |  |  |  |
Acquisition, restructuring and other expenses |  |  | $ 8,317 | $ 1,728 | $ 3,302 |
Fixed rate of interest rate swap |  |  | 580,372 | 182,239 |  |
Interest rate caps agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Premiums paid |  |  |  |  |  | $ 4,600
Cap interest rate |  |  |  |  |  | 3.00%
Effective interest rate |  |  |  |  |  | 3.00%
Acquisition, restructuring and other expenses |  |  | 3,200 |  |  |
Customer Loan Derivatives |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cash posted with counterparty |  |  | 10,700 |  |  |
Designated as Hedging Instrument | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed rate of interest rate swap |  |  | 100,000 | $ 90,000 |  |
Designated as Hedging Instrument | Cash Flow Hedges | Interest rate swap on deposits |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Term of interest rate swap | 5 years | 5 years |  |  |  |
Fixed rate of interest rate swap | $ 50,000 | $ 50,000 |  |  |  |
Notional amount of interest rate swap | 1.55% | 2.461% |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed rate of interest rate swap |  |  | 37,190 |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap on deposits |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed rate of interest rate swap |  |  | $ 37,200 |  |  |
Fixed interest rate, weighted average |  |  | 1.696% |  |  |

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