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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Interchange income | $ 305 | $ 287 | $ 921 | $ 853
Loss on sale of OREO | (59) | 0 | (32) | 0
Cardholder rewards [Memebr] |  |  |  |
Interchange income | $ 37 | $ 35 | $ 100 | $ 97

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