Quarterly report pursuant to Section 13 or 15(d)

RESIDENTIAL MORTGAGE LOANS - Narrative (Details)

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RESIDENTIAL MORTGAGE LOANS - Narrative (Details) - Residential Mortgage Loans
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
trust
Sep. 30, 2020
USD ($)
trust
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of trusts called | trust 65 15
Loans Sold    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income $ 3.3 $ 12.0
Gain on securitization accounted for as sales $ 28.7 $ 48.3