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DERIVATIVES FINANCIAL INSTRUMENTS - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) bank customer | Sep. 30, 2021 USD ($) bank customer | Dec. 31, 2020 USD ($) bank
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Third-party broker | bank | 11 | 11 |
Cash collateral held by counterparty for derivatives | $ 0 | $ 0 | $ 1,700,000
Interest rate derivative |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of derivatives | bank |  |  | 1
Interest rate derivative | Designated as hedging instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative | 50,000,000 | 50,000,000 |
Reclassification of realized losses from AOCI |  | (398,000) |
Derivative, notional amount |  |  | $ 50,000,000
Interest rate derivative | Derivatives not designated as hedging instruments: |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | $ 64,900,000 | $ 64,900,000 | 61,300,000
Number of customers | customer | 11 | 11 |
Interest rate derivative | Derivatives not designated as hedging instruments: | Other Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative | $ 32,462,000 | $ 32,462,000 | 30,673,000
Interest rate derivative | Derivatives not designated as hedging instruments: | Agent Bank |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Upfront fee from derivative | 53,000 |  |
Interest rate derivative | Derivatives not designated as hedging instruments: | Agent Bank | Other Liabilities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative | $ 15,900,000 | $ 15,900,000 | $ 0

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