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REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Interchange income | $ 317,000 | $ 280,000
Cardholder Rewards [Member] |  |
Interchange income | $ 29,000 | $ 32,000

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