UNSECURED BORROWINGS - Additional Information (Details) - Junior Subordinated Debt [Member] $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2018
USD ($)
| |
| Debt Instrument [Line Items] | |
| Junior subordinated notes maturity term | 30 years |
| Face amount of junior subordinated notes | $ 100 |