Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Narrative (Details)

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LOAN SALES AND SECURITIZATIONS - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2012
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]                
Total of automobile loans transferred in securitization transactions   $ 800,000 $ 1,000,000 $ 1,300,000 $ 1,000,000      
Residential Mortgage                
Servicing Assets at Fair Value [Line Items]                
Loans with servicing retained sold $ 715,589 938,412       $ 1,348,055 $ 1,569,096  
Servicing income 12,000 11,000       23,800 23,000  
Pretax gains resulting from above loan sales 18,618 27,471       32,731 42,334  
Unpaid principal balance of third party serviced loans 16,200,000         16,200,000   $ 16,200,000
Automobile Loan                
Servicing Assets at Fair Value [Line Items]                
Loans with servicing retained sold 0 0       750,000 0  
Servicing income 2,000 3,000       4,900 6,600  
Pretax gains resulting from above loan sales 0 0       5,333 0  
Unpaid principal balance of third party serviced loans 600,000         600,000   900,000
Small Business Association (SBA) Loan                
Servicing Assets at Fair Value [Line Items]                
Loans with servicing retained sold 58,629 53,534       104,518 95,935  
Servicing income 2,000 2,000       4,500 4,100  
Pretax gains resulting from above loan sales 4,662 $ 4,696       8,183 $ 8,270  
Unpaid principal balance of third party serviced loans $ 1,100,000         $ 1,100,000   $ 1,000,000