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ACQUISITIONS - Narrative (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 32,160,000 | $ 18,742,000 |
Gross contractual balance of loans receivable |  | 1,651,863,000 | $ 1,359,544,000 | $ 1,307,375,000
Westbound |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of outstanding common shares acquired | 100.00% |  |  |
Consideration transferred | $ 35,991,000 |  |  |
Shares issued (in shares) | 899,816 |  |  |
Shares acquired (in shares) | 2,311,952 |  |  |
Acquisition-related costs | $ 1,101,000 | $ 365,000 |  |
Goodwill | 13,418,000 |  |  |
Goodwill expected to be deducted | 0 |  |  |
Contingent consideration related to escrow agreement | $ 1,750,000 |  |  |
Contingent consideration performance period | 3 years |  |  |
Fair value of performing loans | $ 154,687,000 |  |  |
Gross contractual balance of loans receivable | $ 154,687,000 |  |  |

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