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Use of Special Purpose Entities and Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]      
Residential whole loans $ 7,500,000 $ 7,900,000  
Agency eligible investor loans      
Variable Interest Entity [Line Items]      
Financing receivable, sale 337,800    
Nonperforming | Agency eligible investor loans      
Variable Interest Entity [Line Items]      
Financing receivable, sale 598,000   $ 24,100
Senior Notes      
Variable Interest Entity [Line Items]      
Proceeds from issuance of debt 2,300,000 2,400,000  
Proceed from senior notes net of offering expenses and underwriting discount 2,200,000 2,400,000  
Securitized debt      
Variable Interest Entity [Line Items]      
Financing receivable, sale 567,200    
Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Proceeds from issuance of debt 5,300,681 3,682,082  
Residential whole loans, carrying value 4,000,000 3,000,000  
Securitized debt 3,400,000 2,700,000  
Asset-backed Securities, Securitized Loans and Receivables | Other Assets      
Variable Interest Entity [Line Items]      
Real estate owned at fair value $ 36,500 $ 35,400