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RELATED-PARTY TRANSACTIONS - Agreement with Oaktree Capital Management (Details) - USD ($)				4 Months Ended	9 Months Ended	12 Months Ended
	Apr. 06, 2015	Nov. 08, 2014	Nov. 07, 2014	May 05, 2016	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 11, 2017	Mar. 07, 2017	Feb. 12, 2016	Sep. 30, 2015	Jun. 26, 2015	Jan. 16, 2015
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 263,000
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)			3,288,947								671,702			3,288,947
Price per share issuable (in dollars per share)			$ 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										$ 20,000,000		$ 15,000,000
Amount outstanding					$ 16,000,000	$ 15,000,000
Largest aggregate amount of principal outstanding during period					20,000,000	15,000,000
Proceeds from principal					4,000,000	2,000,000
Proceeds from interest					757,000	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
Amount outstanding					34,700,000	22,600,000
Largest aggregate amount of principal outstanding during period					94,700,000	55,100,000
Proceeds from principal					450,500,000	514,100,000
Proceeds from interest					895,000	$ 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

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