MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) (Residential Mortgages)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Residential Mortgages
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	4 years 8 months 12 days	5 years 2 months 12 days
Weighted average constant prepayment rate (percent)	12.20%	12.10%
Weighted average discount rate (percent)	9.60%	10.40%