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REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Interchange income | $ 374,000 | $ 319,000 | $ 1,061,000 | $ 869,000
Gain on sale of OREO |  |  | 51,000 |
Cardholder Rewards [Member] |  |  |  |
Interchange income | $ 34,000 | $ 31,000 | $ 95,000 | $ 86,000

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