Annual report pursuant to Section 13 and 15(d)

LOAN SALES AND SECURITIZATIONS - Narrative (Details)

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LOAN SALES AND SECURITIZATIONS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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      
Residential Mortgage        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing, late and other ancillary fees included in mortgage banking income   $ 50,000 $ 47,000 $ 44,000
Unpaid principal balance of third party serviced loans   18,900,000 16,200,000 15,600,000
Pretax gains resulting from above loan sales   96,585 83,148 57,590
Automobile        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing, late and other ancillary fees included in mortgage banking income   9,000 5,000 8,000
Unpaid principal balance of third party serviced loans   1,700,000 900,000 800,000
Total of automobile loans transferred In securitization transaction       0
Proceeds from new transfers       0
Automobile | 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     750,000  
Proceeds from new transfers     780,117  
Commercial        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]        
Servicing, late and other ancillary fees included in mortgage banking income   9,000 8,000 7,000
Unpaid principal balance of third party serviced loans   $ 1,100,000 $ 1,000,000 $ 900,000