Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Narrative (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Narrative (Details) - Residential Mortgage Loans
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
trust
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of trusts called | trust 19
Loans Sold  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Interest income $ 32.5
Gain (loss) on sale of investments $ (2.8)