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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - Subordinated Notes - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 30, 2020 | Nov. 26, 2019
Debt Instrument [Line Items] |  |
Principal amount of debt issued |  | $ 40,000
Fixed interest rate |  | 4.625%
Debt issuance costs | $ 700 |
SOFR |  |
Debt Instrument [Line Items] |  |
Interest rate margin | 3.27% |

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