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REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interchange income | $ 1,208,000 | $ 1,238,000 | $ 1,251,000
Loss on sale of OREO | 0 | 0 | (58,000)
Cardholder Rewards [Member] |  |  |
Interchange income | $ 115,000 | $ 138,000 | $ 134,000

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