MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) - Residential mortgages	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	5 years 10 months 24 days	5 years 9 months 18 days	6 years
Weighted average constant prepayment rate	10.70%	11.70%	12.40%
Weighted average discount rate	9.70%	10.30%	10.50%