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LOANS RECEIVABLE AND REVENUE - Narrative (Details) - Consumer Portfolio Segment - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Credit Services Organization Programs          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
TDRs that were charged off $ 2.9 $ 5.1 $ 11.0 $ 6.0  
Installment          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Percent of revenues 1.00%   1.00%    
Loans classified as nonaccrual $ 5.1   $ 5.1   $ 4.4
Revolving LOC          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans classified as nonaccrual 6.1   6.1   $ 6.2
Revolving LOC | Credit Services Organization Programs          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Commitment to lend additional funds $ 2.1   $ 2.1