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SETTLEMENT ASSETS AND OBLIGATIONS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Merchant reserves held by sponsor banks $ 120,900   $ 120,900   $ 103,800
Provision for merchant losses 600 $ 1,200 1,000 $ 2,100  
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Settlement obligations 11,278   11,278   72,878
Due to ACH payees          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Settlement obligations 11,278   11,278   $ 72,878
Due to ACH payees | Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Settlement obligations $ 57,900   $ 57,900