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
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2012
Mar. 31, 2012
Sep. 30, 2011
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 $ 632,466   $ 630,683        
Servicing income 12,000   12,000        
Pretax gains resulting from above loan sales 14,113   14,862        
Unpaid principal balance of third party serviced loans 16,200,000           $ 16,200,000
Automobile Loan              
Servicing Assets at Fair Value [Line Items]              
Servicing income 3,000   3,000        
Unpaid principal balance of third party serviced loans 600,000           900,000
Small Business Association (SBA) Loan              
Servicing Assets at Fair Value [Line Items]              
Loans with servicing retained sold 45,889   42,401        
Servicing income 2,000   2,000        
Pretax gains resulting from above loan sales 3,521   $ 3,574        
Unpaid principal balance of third party serviced loans $ 1,100,000           $ 1,000,000