v3.26.1
Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 4,540,653 $ 4,062,425
Total (losses)/gains (realized/unrealized)    
Included in earnings $ (15,733) $ 48,852
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Operating Income (Expense), Net Other Operating Income (Expense), Net
Transfers out $ (12,333) $ (23,165)
Transfer to securitization trust, net 0 0
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions (295,202) (361,819)
Sales (141,911) (8,352)
Acquisitions/Repurchases 243,848 396,845
Originations 400,810  
Balance at the end of period 4,720,132 4,114,786
Residential loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 583,963 632,266
Total (losses)/gains (realized/unrealized)    
Included in earnings (5,241) 5,857
Transfers out (11,458) (22,506)
Transfer to securitization trust, net (185,934) (464,214)
Transfer from residential loans held for sale to residential loans 238,104  
Paydowns/Distributions (66,491) (56,731)
Sales (10,301) (2,075)
Acquisitions/Repurchases 218,609 352,965
Originations 0  
Balance at the end of period 761,251 445,562
Residential loans | Consolidated SLST | VIE, Primary Beneficiary    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 1,165,677 965,672
Total (losses)/gains (realized/unrealized)    
Included in earnings (6,241) 11,743
Transfers out 0 0
Transfer to securitization trust, net 0 0
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions (21,369) (18,165)
Sales 0 0
Acquisitions/Repurchases 0 0
Originations 0  
Balance at the end of period 1,138,067 959,250
Residential loans held in securitization trusts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 2,608,535 2,243,800
Total (losses)/gains (realized/unrealized)    
Included in earnings (16,025) 25,378
Transfers out (875) (659)
Transfer to securitization trust, net 185,934 464,214
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions (203,302) (261,880)
Sales 0 (6,277)
Acquisitions/Repurchases 24,442 43,880
Originations 0  
Balance at the end of period 2,598,709 2,508,456
Residential loans held for sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 80,707  
Total (losses)/gains (realized/unrealized)    
Included in earnings 9,889  
Transfers out 0  
Transfer to securitization trust, net 0  
Transfer from residential loans held for sale to residential loans (238,104)  
Paydowns/Distributions (882)  
Sales (131,610)  
Acquisitions/Repurchases 797  
Originations 400,810  
Balance at the end of period 121,607  
Multi-family loans, at fair value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 55,476 86,192
Total (losses)/gains (realized/unrealized)    
Included in earnings 1,628 2,991
Transfers out 0 0
Transfer to securitization trust, net 0 0
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions (1,194) (1,961)
Sales 0 0
Acquisitions/Repurchases 0 0
Originations 0  
Balance at the end of period 55,910 87,222
Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 24,711 113,492
Total (losses)/gains (realized/unrealized)    
Included in earnings 721 3,589
Transfers out 0
Transfer to securitization trust, net 0 0
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions (1,964) (23,082)
Sales 0 0
Acquisitions/Repurchases 0 0
Originations 0  
Balance at the end of period 23,468 93,999
MSRs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 20,893 21,003
Total (losses)/gains (realized/unrealized)    
Included in earnings (928) (706)
Transfers out 0 0
Transfer to securitization trust, net 0 0
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions 0 0
Sales 0 0
Acquisitions/Repurchases 0 0
Originations 0  
Balance at the end of period 19,965 $ 20,297
IRLCs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 691  
Total (losses)/gains (realized/unrealized)    
Included in earnings 464  
Transfers out 0  
Transfer to securitization trust, net 0  
Transfer from residential loans held for sale to residential loans 0  
Paydowns/Distributions 0  
Sales 0  
Acquisitions/Repurchases 0  
Originations 0  
Balance at the end of period $ 1,155