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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interchange income | $ 1,251 | $ 1,164 | $ 1,120
Loss on sale of OREO | (58) | 0 | 5
Cardholder rewards [Memebr] |  |  |
Interchange income | $ 134 | $ 129 | $ 124

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