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INVESTMENT SECURITIES AVAILABLE FOR SALE - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment with fair value classified as equity security | $ 14,824,000 | $ 14,824,000 |  | $ 15,117,000
Securities gains/(losses), net | (70,000) | (293,000) | $ 323,000 |
CRA Investment Fund [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment with fair value classified as equity security | 14,800,000 | 14,800,000 |  |
Securities gains/(losses), net | $ 70,000 | $ (293,000) |  |

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