MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) - Residential mortgages	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	5 years 8 months 12 days	5 years 8 months 12 days
Weighted average constant prepayment rate (percent)	10.80%	11.70%
Weighted average discount rate (percent)	9.70%	10.30%