FAIR VALUE MEASUREMENT - Schedule of Valuation of Loans on Nonrecurring Basis (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted Average Life (Years)	1 year 3 months 1 day
Performing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted Average Life (Years)	5 years 7 months 6 days
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Rate	4.00%
Weighted Average Life (Years)	4 years 10 months 24 days
Prepayment Rate	8.90%
CDR	1.30%
Loss Severity	36.60%
Fair Value, Measurements, Nonrecurring | Performing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Rate	3.80%
Weighted Average Life (Years)	5 years 1 month 6 days
Prepayment Rate	9.40%
CDR	1.20%
Loss Severity	37.20%
Fair Value, Measurements, Nonrecurring | Non-Performing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Rate	6.60%
Weighted Average Life (Years)	2 years 10 months 24 days
Prepayment Rate	3.00%
CDR	3.00%
Loss Severity	30.00%
Fair Value, Measurements, Nonrecurring | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value	$ 754,406
Fair Value, Measurements, Nonrecurring | Fair Value | Performing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value	693,427
Fair Value, Measurements, Nonrecurring | Fair Value | Non-Performing Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value and Carrying Value	$ 60,979