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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
entity
Mar. 31, 2026
USD ($)
entity
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Variable Interest Entity [Line Items]            
Number of SPE liquidated | entity 4 3        
Primary beneficiary, maximum loss exposure, amount $ 12,800     $ 12,800    
Total residential whole loans 8,800,000     8,800,000   $ 8,800,000
Asset-backed Securities, Securitized Loans and Receivables            
Variable Interest Entity [Line Items]            
Proceeds from issuance of debt       10,220,276   10,061,131
Residential whole loans transferred to consolidated VIEs 7,200,000     7,200,000   7,600,000
Securitized debt 6,200,000     6,200,000   6,300,000
Asset-backed Securities, Securitized Loans and Receivables | Balance Sheet Location [Axis]: us-gaap:OtherAssets            
Variable Interest Entity [Line Items]            
Real estate owned at fair value 45,500     45,500   $ 52,400
Asset-backed Securities, Securitized Loans and Receivables | Senior Bonds            
Variable Interest Entity [Line Items]            
Proceeds from issuance of debt 772,200   $ 291,300 1,500,000 $ 574,700  
Proceed from debt net of offering expenses and underwriting discount 771,800   $ 291,300 $ 1,500,000 $ 574,700  
Repayments of debt $ 385,100 $ 470,100