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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 01, 2018
USD ($)
Jun. 11, 2017
USD ($)
Jun. 26, 2015
USD ($)
Nov. 08, 2014
Branch
Banco Popular North America (BPNA)            
Related Party Transaction [Line Items]            
Number of branches | Branch           20
Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree | Loan Origination Commitments            
Related Party Transaction [Line Items]            
Amount outstanding $ 15,000,000 $ 3,600,000        
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 32,500,000 94,700,000        
Amount outstanding 0 23,600,000 $ 3,500,000      
Proceeds from principal 210,400,000 600,400,000        
Proceeds from interest 370,000 $ 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