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OTHER ASSETS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items]      
Mortgage loans sold and serviced for others $ 1,300.0 $ 807.6 $ 625.4
Servicing fees $ 3.2 $ 1.7 $ 1.5
Weighted average discount rate (as a percent) 11.80%    
Minimum      
Servicing Asset at Amortized Cost [Line Items]      
Pre-payment speed (as a percent) 7.35%    
Maximum      
Servicing Asset at Amortized Cost [Line Items]      
Pre-payment speed (as a percent) 14.28%