Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Automobile Loans (Details)

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LOAN SALES AND SECURITIZATIONS - Automobile Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction         $ 0
Proceeds from new transfers         0
Gain (Loss) on Sale of Mortgage Loans     $ 5,632 $ 5,333 0
New servicing assets created         $ 0
Trust 2016 Unconsolidated          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction $ 2,000        
Trust 2016 Unconsolidated | Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction     1,500,000    
Proceeds from new transfers     1,551,679    
New servicing assets created     $ 15,670    
2015-1 Automobile Trust          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction   $ 1,000      
2015-1 Automobile Trust | Automobile          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Total of automobile loans transferred In securitization transaction       750,000  
Proceeds from new transfers       780,117  
New servicing assets created       $ 11,180