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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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