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REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Interchange income | $ 370,000 | $ 270,000 | $ 687,000 | $ 550,000
Gain on sale of OREO | 51,000 | 0 | 51,000 | 0
Cardholder Rewards [Member] |  |  |  |
Interchange income | $ 32,000 | $ 23,000 | $ 61,000 | $ 55,000

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