Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Unpaid Principal Balance and Carrying Value for Uncollectible Loans (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Unpaid Principal Balance and Carrying Value for Uncollectible Loans (Details) - PCD Loans - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Unpaid Principal Balance $ 237,464 $ 249,254
Carrying Value $ 169,802 $ 183,540