Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Automobile Loans, MSRs Amortizations Method Key Assumptions (Details)

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LOAN SALES AND SECURITIZATIONS - Automobile Loans, MSRs Amortizations Method Key Assumptions (Details) - Amortization method - Automobile - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Servicing Asset at Amortized Cost [Line Items]      
Constant prepayment rate (annualized), actual 19.95% 19.98%  
Constant prepayment rate (annualized), 10% adverse change $ (877)   $ (1,047)
Constant prepayment rate (annualized), 20% adverse change $ (1,695)   (2,026)
Spread over forward interest rate swap rates, actual 5.00% 5.00%  
Spread over forward interest rate swap rates, 10% adverse change $ (22)   (26)
Spread over forward interest rate swap rates, 20% adverse change $ (45)   $ (53)