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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2017
segment
Accounting Policies [Abstract]  
Number of days until which automobile loans accrue, after which they are charged off 120 days
Minimum number of days past due for loans excluding automobile loans on which interest is generally not accrued 90 days
Threshold percentage of amortization of net actuarial gain or loss in net periodic benefit cost over the average remaining service period of active participants in the Plans 10.00%
Number of reportable segments (segment) 1
Number of operating segments (segment) 1