Annual report pursuant to Section 13 and 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS AND REAL ESTATE OWNED - Narrative (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS AND REAL ESTATE OWNED - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
trust
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]  
Threshold period past due (in days) 60 days
Government Guaranteed Mortgage Loans upon Foreclosure Receivable  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]  
Claims receivable $ 19.1
Residential Mortgage Loans  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]  
Unpaid principal balance $ 433.1
Residential Mortgage Loans  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]  
Number of trusts called | trust 140
Loans Sold | Residential Mortgage Loans  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]  
Investment income, interest $ 54.4
Gain (loss) on sale $ 156.2