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Repurchase Agreements and Warehouse Facilities - Schedule of Borrowings Under Financing Arrangements and Associated Assets Pledged as Collateral (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Outstanding Repurchase Agreements or Warehouse Facilities $ 6,100,691 $ 3,516,611
Carrying Value of Repurchase Agreements and Warehouse Facilities 6,481,072 4,012,225
Fair Value of Collateral Pledged $ 4,256,683 $ 3,841,738
Weighted Average Months to Maturity 41 days 26 days
Single Family    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Fair Value of Collateral Pledged $ 118,500 $ 134,600
Residential Loans and Real Estate Owned    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Carrying Value of Repurchase Agreements and Warehouse Facilities 217,612 428,399
Fair Value of Collateral Pledged 252,900  
Residential Loans Held for Sale    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Carrying Value of Repurchase Agreements and Warehouse Facilities 97,290 0
Fair Value of Collateral Pledged 102,800  
Residential Loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Fair Value of Collateral Pledged   524,600
Residential loans    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Maximum Aggregate Uncommitted Principal or Line Amount 3,225,000 2,775,000
Outstanding Repurchase Agreements or Warehouse Facilities 380,692 496,410
Net Deferred Finance Costs (311) (796)
Carrying Value of Repurchase Agreements and Warehouse Facilities 380,381 495,614
Fair Value of Collateral Pledged $ 474,220 $ 659,183
Weighted Average Rate 6.37% 6.70%
Weighted Average Months to Maturity 5 years 6 months 21 days 9 years 7 months 20 days