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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details) - USD ($) |  |  |  | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2015 | Nov. 08, 2014 | Nov. 07, 2014 | May 05, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 11, 2017 | Mar. 07, 2017 | Feb. 12, 2016 | Sep. 30, 2015 | Jun. 26, 2015 | Jan. 16, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties | $ 263,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Greater Than 5% Shareholder, Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 9.90% |  |  |  |  |  |  |  | 5.00% |  |  |
Greater Than 5% Shareholder, Oaktree | The Palisades Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receipt of payments under management agreement |  |  |  | $ 1,000,000 |  |  | $ 5,100,000 | $ 5,300,000 |  |  |  |  |  |
Greater Than 5% Shareholder, Oaktree | Equity Support Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Greater Than 5% Shareholder, Oaktree | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  | 3,288,947 |  |  |  |  |  |  |  | 671,702 |  |  | 3,288,947
Price per share issuable (in dollars per share) |  |  | $ 9.78 |  |  |  |  |  |  |  |  |  |  |
Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Origination Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed revolving repurchase facility |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  | $ 15,000,000 |  |
Amount outstanding |  |  |  |  | $ 16,000,000 | $ 15,000,000 |  |  |  |  |  |  |  |
Largest aggregate amount of principal outstanding during period |  |  |  |  | 20,000,000 | 15,000,000 |  |  |  |  |  |  |  |
Proceeds from principal |  |  |  |  | 4,000,000 | 2,000,000 |  |  |  |  |  |  |  |
Proceeds from interest |  |  |  |  | 757,000 | 462,000 |  |  |  |  |  |  |  |
Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Purchase Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed revolving repurchase facility |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  | $ 35,000,000 |
Amount outstanding |  |  |  |  | 34,700,000 | 22,600,000 |  |  |  |  |  |  |  |
Largest aggregate amount of principal outstanding during period |  |  |  |  | 94,700,000 | 55,100,000 |  |  |  |  |  |  |  |
Proceeds from principal |  |  |  |  | 450,500,000 | 514,100,000 |  |  |  |  |  |  |  |
Proceeds from interest |  |  |  |  | 895,000 | $ 1,100,000 |  |  |  |  |  |  |  |
Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Purchase Commitments | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed revolving repurchase facility |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |

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