UNSECURED BORROWINGS - Schedule of Subordinated Note Balances and Related Weighted Average Interest Rates (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2017 |
|
| Debt Instrument [Line Items] | ||
| Borrowings Outstanding | $ 98,216 | $ 98,191 |
| Effective interest rate | 7.75% | 7.75% |
| October 2035 [Member] | ||
| Debt Instrument [Line Items] | ||
| Borrowings Outstanding | $ 34,325 | $ 34,315 |
| Effective interest rate | 7.89% | 7.90% |
| Junior subordinated notes, maturity period | Oct. 31, 2035 | |
| Face amount of junior subordinated notes | $ 35,000 | |
| December 2035 [Member] | ||
| Debt Instrument [Line Items] | ||
| Borrowings Outstanding | $ 39,330 | $ 39,320 |
| Effective interest rate | 7.66% | 7.66% |
| Junior subordinated notes, maturity period | Dec. 31, 2035 | |
| Face amount of junior subordinated notes | $ 40,000 | |
| September 2036 [Member] | ||
| Debt Instrument [Line Items] | ||
| Borrowings Outstanding | $ 24,561 | $ 24,556 |
| Effective interest rate | 7.70% | 7.70% |
| Junior subordinated notes, maturity period | Sep. 30, 2036 | |
| Face amount of junior subordinated notes | $ 25,000 |