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Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 3,327,211 $ 3,801,370 $ 3,935,253
Total gains/(losses) (realized/unrealized)      
Included in earnings 33,524 99,357 (375,144)
Transfers out (88,462) (52,791) (18,858)
Transfers to securitization trust, net 0 0 0
Transfer from disposal group held for sale   0 0
Funding/Contributions   55,882 28,086
Paydowns/Distributions (1,234,384) (1,171,740) (1,501,232)
Sales (162,883) (25,144)  
Acquisitions 2,187,419 620,277 1,733,265
Balance at the end of period $ 4,062,425 $ 3,327,211 $ 3,801,370
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 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 $ 827,535 $ 1,081,384 $ 1,703,290
Total gains/(losses) (realized/unrealized)      
Included in earnings 15,562 8,080 (111,879)
Transfers out (80,801) (26,277) (17,052)
Transfers to securitization trust, net (1,456,376) (282,831) (1,422,577)
Transfer from disposal group held for sale   0 0
Funding/Contributions   0  
Paydowns/Distributions (296,645) (482,137) (712,214)
Sales (156,175) (21,165)  
Acquisitions 1,779,166 550,481 1,641,816
Balance at the end of period 632,266 827,535 1,081,384
Residential loans | VIE, Primary Beneficiary | Consolidated SLST      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 754,860 827,582 1,070,882
Total gains/(losses) (realized/unrealized)      
Included in earnings 3,523 (10,748) (128,236)
Transfers out 0 0 0
Transfers to securitization trust, net 0 0 0
Transfer from disposal group held for sale   0 0
Funding/Contributions   0 0
Paydowns/Distributions (77,768) (61,974) (115,064)
Sales 0 0  
Acquisitions 285,057 0 0
Balance at the end of period 965,672 754,860 827,582
Residential loans held in securitization trusts      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 1,501,908 1,616,114 801,429
Total gains/(losses) (realized/unrealized)      
Included in earnings (8,255) 72,173 (162,518)
Transfers out (7,661) (16,208) (1,806)
Transfers to securitization trust, net 1,456,376 282,831 1,422,577
Transfer from disposal group held for sale   0 0
Funding/Contributions   0 0
Paydowns/Distributions (805,586) (518,819) (535,017)
Sales (6,708) (3,979)  
Acquisitions 113,726 69,796 91,449
Balance at the end of period 2,243,800 1,501,908 1,616,114
Multi-family loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 95,792 87,534 120,021
Total gains/(losses) (realized/unrealized)      
Included in earnings 5,899 11,863 9,531
Transfers out 0 (10,306) 0
Transfers to securitization trust, net 0 0 0
Transfer from disposal group held for sale   0 0
Funding/Contributions   21,924 0
Paydowns/Distributions (15,499) (15,223) (42,018)
Sales 0 0  
Acquisitions 0 0 0
Balance at the end of period 86,192 95,792 87,534
Equity investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 147,116 179,746 239,631
Total gains/(losses) (realized/unrealized)      
Included in earnings 16,179 21,279 18,884
Transfers out 0 0 0
Transfers to securitization trust, net 0 0 0
Transfer from disposal group held for sale   5,720 (9,936)
Funding/Contributions   33,958 28,086
Paydowns/Distributions (49,803) (93,587) (96,919)
Sales 0 0  
Acquisitions 0 0 0
Balance at the end of period 113,492 147,116 179,746
Mortgage servicing rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period 0    
Total gains/(losses) (realized/unrealized)      
Included in earnings 616    
Transfers out 0    
Transfers to securitization trust, net 0    
Paydowns/Distributions 10,917    
Sales 0    
Acquisitions 9,470    
Balance at the end of period 21,003 0  
Equity investments in disposal group held for sale      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period $ 0 9,010 0
Total gains/(losses) (realized/unrealized)      
Included in earnings   (3,290) (926)
Transfers out   0 0
Transfers to securitization trust, net   0 0
Transfer from disposal group held for sale   (5,720) 9,936
Funding/Contributions   0 0
Paydowns/Distributions   0 0
Sales   0  
Acquisitions   0 0
Balance at the end of period   $ 0 $ 9,010