Quarterly report pursuant to Section 13 or 15(d)

RESIDENTIAL MORTGAGE LOANS - Schedule of Aggregate Unpaid Principal Balance and Aggregate Carrying Value (Details)

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RESIDENTIAL MORTGAGE LOANS - Schedule of Aggregate Unpaid Principal Balance and Aggregate Carrying Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 285,002 $ 52,389
90 to 119 | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 28,898 71,567
Notes receivable 26,442 59,679
Fair Value Over (Under) Unpaid Principal Balance (2,456) (11,888)
120 or greater | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 410,134 950,564
Notes receivable 397,483 790,788
Fair Value Over (Under) Unpaid Principal Balance (12,651) (159,776)
Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 287,431 51,575
Notes receivable 285,002 52,389
Fair Value Over (Under) Unpaid Principal Balance (2,429) 814
Past Due | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 439,032 1,022,131
Notes receivable 423,925 850,467
Fair Value Over (Under) Unpaid Principal Balance $ (15,107) $ (171,664)