Annual report pursuant to Section 13 and 15(d)

Loans, at Fair Value - Loans Held For Investment And Held For Sale (Details)

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Loans, at Fair Value - Loans Held For Investment And Held For Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance $ 25,838,677 $ 19,421,909  
Fair Value Adjustments 561,953 228,811  
Estimated Fair Value 26,400,630 19,650,720  
Loans held for investment, subject to HMBS related obligations      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 16,875,437 10,719,000  
Fair Value Adjustments 673,326 395,100  
Estimated Fair Value 17,548,763 11,114,100  
Loans held for investment, subject to nonrecourse debt      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 8,394,372 7,646,095  
Fair Value Adjustments (121,979) (191,457)  
Estimated Fair Value 8,272,393 7,454,638  
Reverse mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 8,257,750 7,240,125  
Fair Value Adjustments (119,347) (174,648)  
Estimated Fair Value 8,138,403 7,065,477  
Commercial mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 136,622 405,970  
Fair Value Adjustments (2,632) (16,809)  
Estimated Fair Value 133,990 389,161  
Loans Held-For-Investment      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 559,621 868,173  
Fair Value Adjustments 15,607 39,825  
Estimated Fair Value 575,228 907,998  
Reverse mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 558,577 724,800  
Fair Value Adjustments 15,694 46,924  
Estimated Fair Value 574,271 771,724  
Commercial mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 1,044 143,373  
Fair Value Adjustments (87) (7,099)  
Estimated Fair Value 957 136,274  
Loans Held-For-Sale      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance   188,641  
Fair Value Adjustments   (14,657)  
Estimated Fair Value 4,246 173,984 $ 158,156
Residential mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance 9,247 15,529  
Fair Value Adjustments (5,001) (3,406)  
Estimated Fair Value 4,246 12,123  
Commercial mortgage loans      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance   173,112  
Fair Value Adjustments   (11,251)  
Estimated Fair Value   161,861  
Loans Held-For-Investment, Pledged As Collateral, Financing Lines Of Credit      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance $ 487,900 745,100  
Loans Held-For-Sale, Pledged As Collateral, Financing Lines Of Credit      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Unpaid Principal Balance   $ 186,000