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, 2012
Mar. 31, 2012
Sep. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 800,000 $ 1,000,000 $ 1,300,000 $ 1,000,000      
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         $ 47,000 $ 44,000 $ 44,000
Amortization and impairment Included In Mortgage Banking Income         27,000 24,000 29,000
Unpaid principal balance of third party serviced loans         16,200,000 15,600,000 15,200,000
Pretax gains resulting from above loan sales         83,148 57,590 102,935
Automobile Loan              
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         5,000 8,000 10,000
Unpaid principal balance of third party serviced loans         900,000 800,000 1,600,000
Pretax gains resulting from above loan sales 5,000            
Automobile Loan | 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 780,000            
Servicing asset additions resulting from securitizations $ 11,000            
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         8,000 7,000 6,000
Unpaid principal balance of third party serviced loans         $ 1,000,000 $ 900,000 $ 900,000