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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details)				4 Months Ended	12 Months Ended
	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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