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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Interchange income | $ 322 | $ 326 | $ 586 | $ 616
Cardholder rewards [Member] |  |  |  |
Interchange income | $ 36 | $ 34 | $ 68 | $ 63

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