Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Automobile Loans, MSRs Amortization Method (Details)

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LOAN SALES AND SECURITIZATIONS - Automobile Loans, MSRs Amortization Method (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Fair value, end of period $ 224,656   $ 224,656   $ 225,578
Automobile          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Carrying value, beginning of period 15,159 $ 7,029 18,285 $ 8,771  
Amortization and other (2,635) (1,571) (5,761) (3,313)  
Fair value, end of period 12,571 5,551 12,571 5,551  
Carrying value, end of period $ 12,524 $ 5,458 $ 12,524 $ 5,458  
Automobile | Amortization method          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Weighted-average life (years) 3 years 9 months 3 years 3 years 9 months 3 years