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Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 4,062,425 $ 3,327,211
Total gains/(losses) (realized/unrealized)    
Included in earnings 48,852 (9,009)
Transfers out (23,165) (21,066)
Transfer to securitization trust, net 0 0
Paydowns/Distributions (361,819) (241,006)
Sales (8,352) (28,912)
Purchases/Acquisitions 396,845 305,735
Balance at the end of period $ 4,114,786 $ 3,332,953
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
Residential loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 632,266 $ 827,535
Total gains/(losses) (realized/unrealized)    
Included in earnings 5,857 (2,924)
Transfers out (22,506) (18,180)
Transfer to securitization trust, net (464,214) (370,804)
Paydowns/Distributions (56,731) (62,718)
Sales (2,075) (22,204)
Purchases/Acquisitions 352,965 290,024
Balance at the end of period 445,562 640,729
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 965,672 754,860
Total gains/(losses) (realized/unrealized)    
Included in earnings 11,743 (138)
Transfers out 0 0
Transfer to securitization trust, net 0 0
Paydowns/Distributions (18,165) (16,596)
Sales 0 0
Purchases/Acquisitions 0 0
Balance at the end of period 959,250 738,126
Residential loans held in securitization trusts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 2,243,800 1,501,908
Total gains/(losses) (realized/unrealized)    
Included in earnings 25,378 (1,773)
Transfers out (659) (2,886)
Transfer to securitization trust, net 464,214 370,804
Paydowns/Distributions (261,880) (152,806)
Sales (6,277) (6,708)
Purchases/Acquisitions 43,880 15,711
Balance at the end of period 2,508,456 1,724,250
Multi-family loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 86,192 95,792
Total gains/(losses) (realized/unrealized)    
Included in earnings 2,991 (2,137)
Transfers out 0 0
Transfer to securitization trust, net 0 0
Paydowns/Distributions (1,961) (1,750)
Sales 0 0
Purchases/Acquisitions 0 0
Balance at the end of period 87,222 91,905
Equity investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 113,492 147,116
Total gains/(losses) (realized/unrealized)    
Included in earnings 3,589 (2,037)
Transfers out 0 0
Transfer to securitization trust, net 0 0
Paydowns/Distributions (23,082) (7,136)
Sales 0 0
Purchases/Acquisitions 0 0
Balance at the end of period 93,999 $ 137,943
Mortgage servicing rights    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 21,003  
Total gains/(losses) (realized/unrealized)    
Included in earnings (706)  
Transfers out 0  
Transfer to securitization trust, net 0  
Paydowns/Distributions  
Sales 0  
Purchases/Acquisitions  
Balance at the end of period $ 20,297