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Securitized Mortgage Trusts - Securitized Mortgage Trust Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Securitized Mortgage Trusts    
REO $ 10,335 $ 10,140
Impairment (1) (6,856) (6,967)
Ending balance 3,479 3,173
REO inside trust 3,479 3,094
REO outside trust   79
Securitized Mortgage Trust Liabilities    
Securitized mortgage borrowings $ 1,614,862 $ 2,086,557