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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2015 USD ($) | Nov. 07, 2014 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Jun. 26, 2015 USD ($) | Jan. 16, 2015 shares | Nov. 08, 2014 Branch
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 |  |  | $ 629,000 | $ 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) | shares |  | 3,288,947 |  | 958,296 |  |  |  | 3,288,947 |
Price per share issuable | $ / shares |  | $ 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 |  |  |  |  |  | $ 15,000,000 |  |  |
Largest aggregate amount of principal outstanding during period |  |  | 6,800,000 | $ 3,600,000 |  |  |  |  |
Proceeds from principal |  |  | 0 | 0 |  |  |  |  |
Proceeds from interest |  |  | 57,000 | 14,000 |  |  |  |  |
Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Purchase Commitments |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Committed revolving repurchase facility |  |  |  |  |  |  | $ 35,000,000 |  |
Largest aggregate amount of principal outstanding during period |  |  | 31,600,000 | 26,300,000 |  |  |  |  |
Proceeds from principal |  |  | 92,600,000 | 105,000,000 |  |  |  |  |
Proceeds from interest |  |  | 244,000 | 252,000 |  |  |  |  |
Amount outstanding |  |  | $ 3,900,000 | $ 26,300,000 |  |  |  |  |
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 |  |  |  |  |  |  | $ 40,000,000 |  |

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