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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Fair value, end of period $ 229,746   $ 229,746   $ 225,578
Automobile          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Carrying value, beginning of period 12,524 $ 5,458 18,285 $ 8,771  
Amortization and other (2,338) (1,087) (8,099) (4,400)  
Fair value, end of period 10,398 4,366 10,398 4,366  
Carrying value, end of period $ 10,186 $ 4,371 $ 10,186 $ 4,371  
Automobile | Amortization method          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Weighted-average life (years) 3 years 8 months 3 years 2 months 3 years 8 months 3 years 2 months