MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) - Residential mortgages	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	5 years 8 months 12 days	6 years 4 months 24 days	5 years 10 months 24 days	5 years 8 months 12 days
Weighted average constant prepayment rate	12.30%	10.10%	11.70%	10.80%
Weighted average discount rate	9.80%	9.70%	9.80%	9.70%