FAIR VALUE MEASUREMENTS - Nonrecurring Fair Value Measurements Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average life (in years)	5 years 2 months 12 days	5 years 4 months 24 days
Weighted average constant prepayment rate (percent)	12.20%	13.00%
Weighted average discount rate (percent)	10.30%	10.80%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average life (in years)	1 year 8 months 12 days	1 year 9 months 18 days
Weighted average constant prepayment rate (percent)	9.80%	9.40%
Weighted average discount rate (percent)	9.60%	10.20%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average life (in years)	7 years	7 years 4 months 24 days
Weighted average constant prepayment rate (percent)	22.40%	41.50%
Weighted average discount rate (percent)	12.60%	13.10%