MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) - Residential mortgages	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	6 years 1 month 6 days	4 years 8 months 12 days
Weighted average constant prepayment rate	11.00%	12.20%
Weighted average discount rate	9.80%	9.60%