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 Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Residential Mortgage        
Servicing Assets at Fair Value [Line Items]        
Servicing income $ 15.0 $ 14.0 $ 29.0  
Unpaid principal balance of third party serviced loans 20,200.0   20,200.0 $ 19,800.0
Automobile        
Servicing Assets at Fair Value [Line Items]        
Servicing income 3.0 5.0 6.0  
Unpaid principal balance of third party serviced loans 800.0   800.0 1,000.0
Small Business Association (SBA) Loan        
Servicing Assets at Fair Value [Line Items]        
Servicing income 3.0 $ 3.0 6.0  
Unpaid principal balance of third party serviced loans $ 1,500.0   $ 1,500.0 $ 1,400.0