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LOANS RECEIVABLE AND REVENUE - Narrative (Details) - Consumer Portfolio Segment
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
contract
Mar. 31, 2020
contract
Dec. 31, 2020
USD ($)
Credit Services Organization Programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
TDRs that were charged off $ 4.8    
Number of TDR loans | contract 3,780 0  
Installment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Percent of revenues 1.00%    
Loans classified as nonaccrual $ 3.9   $ 4.4
Revolving LOC      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans classified as nonaccrual 5.3   $ 6.2
Revolving LOC | Credit Services Organization Programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Commitment to lend additional funds $ 2.9