Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Fair value, end of year $ 225,578 $ 189,237  
Automobile      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Carrying value, beginning of year 8,771 6,898  
New servicing assets created     $ 0
Amortization and other (6,156) (9,307)  
Carrying value, end of year 18,285 8,771 $ 6,898
Fair value, end of year $ 18,388 $ 9,127  
Automobile | Sensitivity Analysis Amortization Carrying Method      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Weighted-average life (years) 4 years 2 months 3 years 2 months