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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details)
4 Months Ended 9 Months Ended 12 Months Ended
Apr. 06, 2015
USD ($)
Nov. 07, 2014
USD ($)
$ / shares
shares
May 05, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Oct. 07, 2016
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     $ 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) | shares   3,288,947     671,702         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      
Amount outstanding       $ 11,400,000 $ 3,600,000            
Largest aggregate amount of principal outstanding during period       12,200,000 3,600,000            
Proceeds from principal       2,000,000 0            
Proceeds from interest       300,000 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    
Amount outstanding       37,300,000 26,300,000            
Largest aggregate amount of principal outstanding during period       51,500,000 26,300,000            
Proceeds from principal       327,000,000 105,000,000            
Proceeds from interest       722,000 $ 252,000            
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       $ 55,000,000              
Subsequent Event | Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Purchase Commitments                      
Related Party Transaction [Line Items]                      
Committed revolving repurchase facility             $ 45,000,000