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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Summary of Changes in Accretable Yield (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Beginning balance $ 0 $ 0
Additions 72,053 207,231
Accretion (990) (30,361)
Reclassifications from non-accretable difference [1] 0 6,836
Disposals [2] 0 (8,324)
Transfer to held-for-sale [3]   (175,382)
Ending balance $ 71,063 $ 0
[1] Represents a probable and significant increase in cash flows previously expected to be uncollectible.
[2] Includes sales of loans or foreclosures, which result in removal of the loan from the PCD loan pool at its carrying amount.
[3] Recognition of the accretable yield ceases upon transfer of the PCD loan pools to held-for-sale.