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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details) |  |  |  | 4 Months Ended | 12 Months Ended |  |  |  |  |  |
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Apr. 06, 2015 USD ($) | Nov. 08, 2014 USD ($) Branch | Nov. 07, 2014 $ / shares shares | May 05, 2016 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) | Jun. 11, 2017 USD ($) | Mar. 07, 2017 USD ($) | Sep. 30, 2015 USD ($) | Jun. 26, 2015 USD ($) | Jan. 16, 2015 shares
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses from transactions with related parties | $ 263,000 |  |  |  |  |  |  |  |  |  |  |  |
Banco Popular North America (BPNA) |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of branches | Branch |  | 20 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
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 |  |
Largest aggregate amount of principal outstanding during period |  |  |  |  | $ 16,000,000 | 15,000,000 |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | 15,000,000 | 3,600,000 |  |  |  |  |  |  |
Proceeds from principal |  |  |  |  | 4,000,000 | 2,000,000 |  |  |  |  |  |  |
Proceeds from interest |  |  |  |  | 1,000,000 | 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 |
Largest aggregate amount of principal outstanding during period |  |  |  |  | 94,700,000 | 55,100,000 |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | 23,600,000 | 22,600,000 |  |  |  |  |  |  |
Proceeds from principal |  |  |  |  | 600,400,000 | 514,100,000 |  |  |  |  |  |  |
Proceeds from interest |  |  |  |  | 1,100,000 | $ 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 |  |  | $ 100,000,000 |  |  |  |  |
Common Stock | Greater Than 5% Shareholder, Oaktree |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  | 3,288,947 |  | 671,702 |  |  |  |  |  |  |  | 3,288,947
Price per share issuable (in dollars per share) | $ / shares |  |  | $ 9.78 |  |  |  |  |  |  |  |  |  |

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