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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - Subordinated borrowings - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Nov. 26, 2019
Debt Instrument [Line Items] |  |  |
Debt issuance costs |  | $ 659 |
Principal amount of debt issued |  |  | $ 40,000
Fixed interest rate |  |  | 4.625%
Debt issuance costs | $ 537 |  |
SOFR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin | 3.27% |  |

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