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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
1 Months Ended
Nov. 17, 2017
USD ($)
Jun. 15, 2017
USD ($)
Oct. 02, 2015
USD ($)
Feb. 13, 2015
lawsuit
Dec. 31, 2017
USD ($)
Consumer Loan Companies | Consumer Portfolio Segment | Unfunded Loan Commitment          
Loss Contingencies [Line Items]          
Loans of unfunded and available revolving credit privileges         $ 152.0
Putative Class Action Lawsuits          
Loss Contingencies [Line Items]          
Number of claims | lawsuit       3  
Amount awarded to other party   $ 6.0      
Insurance proceeds $ 5.0        
HSART Bondholders          
Loss Contingencies [Line Items]          
Amount released from restricted cash to unrestricted use     $ 92.7