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Subsequent Events (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Subsequent Event [Line Items]      
Payments on outstanding repurchase agreements   $ (2,434,447) $ 427,077
Subsequent Event      
Subsequent Event [Line Items]      
Proceeds from sales of residential loans $ 299,400    
Payments on outstanding repurchase agreements $ 236,000