SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		1 Months Ended	12 Months Ended
	Oct. 17, 2014	Oct. 31, 2014	Dec. 31, 2015 USD ($) risk	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	May. 15, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Management fee rate payable						1.50%
Reverse stock split	0.5	0.5
Number of significant types of economic risk | risk			2
Monthly payment threshold period to determine whether loan is past due			30 days
Principal or interest past due threshold period			120 days
Restricted cash			$ 94,702,000	$ 29,418,000
General maturity term of repurchase agreements and notes payable			1 year
Secured Corporate Note [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Restricted cash			$ 900,000
Servicer Advances [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Restricted cash			93,800,000	29,400,000
FHLBC Stock [Member] | Other Assets [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost method investment			$ (2,800)
Restatement Adjustment [Member] | Cash Flow Reclassification, Investing to Operating [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Gross cash inflows				1,300,000,000	$ 0
Gross cash outflows				$ 1,600,000,000	$ 0