v3.25.3
Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 4,212,415 $ 3,739,103 $ 4,062,425 $ 3,327,211
Total gains/(losses) (realized/unrealized)        
Included in earnings $ 36,292 $ 94,356 $ 113,638 $ 92,173
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 Other Operating Income (Expense), Net
Transfers in $ 150,771   $ 150,771  
Transfers out (44,443) $ (26,577) (75,039) $ (71,348)
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions (378,932) (301,538) (1,163,191) (822,234)
Sales (346,697) (117,915) (383,647) (149,833)
Acquisitions 366,585 624,162 1,291,034 1,635,622
Originations 382,443   382,443  
Balance at the end of period 4,378,434 4,011,591 4,378,434 4,011,591
Residential loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 367,089 667,218 632,266 827,535
Total gains/(losses) (realized/unrealized)        
Included in earnings 8,813 14,397 15,592 15,554
Transfers in 580   580  
Transfers out (4,014) (25,064) (30,740) (66,065)
Transfer to securitization trust, net (442,741) (354,169) (1,127,837) (987,452)
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans 213,811   213,811  
Paydowns/Distributions (41,743) (77,187) (162,548) (223,643)
Sales (121,221) (117,915) (151,894) (143,125)
Acquisitions 327,848 593,575 919,192 1,278,051
Originations 0   0  
Balance at the end of period 308,422 700,855 308,422 700,855
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 1,199,383 1,004,944 965,672 754,860
Total gains/(losses) (realized/unrealized)        
Included in earnings 7,677 26,939 35,429 24,250
Transfers in 0   0  
Transfers out 0 0 0 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions (24,461) (23,300) (65,907) (55,584)
Sales 0 0 0 0
Acquisitions 0 0 247,405 285,057
Originations 0   0  
Balance at the end of period 1,182,599 1,008,583 1,182,599 1,008,583
Residential loans held in securitization trusts        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 2,459,555 1,831,029 2,243,800 1,501,908
Total gains/(losses) (realized/unrealized)        
Included in earnings 13,354 44,079 50,338 38,841
Transfers in 0   0  
Transfers out (6,670) (1,513) (10,540) (5,283)
Transfer to securitization trust, net 442,741 354,169 1,127,837 987,452
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions (280,146) (190,645) (862,024) (521,018)
Sales (6,945) 0 (13,222) (6,708)
Acquisitions 38,737 30,587 124,437 72,514
Originations 0   0  
Balance at the end of period 2,660,626 2,067,706 2,660,626 2,067,706
Residential Loans Held for Sale        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 0   0  
Total gains/(losses) (realized/unrealized)        
Included in earnings 8,824   8,824  
Transfers in 145,748   145,748  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans (213,811)   (213,811)  
Paydowns/Distributions (137)   (137)  
Sales (218,031)   (218,031)  
Acquisitions 0   0  
Originations 382,443   382,443  
Balance at the end of period 105,036   105,036  
Multi-family loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 74,999 92,997 86,192 95,792
Total gains/(losses) (realized/unrealized)        
Included in earnings 2,224 2,887 7,447 3,404
Transfers in 0   0  
Transfers out 0 0 0 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions (8,576) (8,270) (24,992) (11,582)
Sales 0 0 0 0
Acquisitions 0 0 0 0
Originations 0   0  
Balance at the end of period 68,647 87,614 68,647 87,614
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 91,440 142,915 113,492 147,116
Total gains/(losses) (realized/unrealized)        
Included in earnings (1,582) 6,054 580 10,124
Transfers in 0   0  
Transfers out (33,759) 0 (33,759) 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale     (500)  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions (27,274) (2,136) (50,988) (10,407)
Sales 0 0 0 0
Acquisitions 0 0 0 0
Originations 0   0  
Balance at the end of period 28,825 $ 146,833 28,825 $ 146,833
Assets of disposal group held for sale | Assets of disposal group held for sale        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 500   0  
Total gains/(losses) (realized/unrealized)        
Included in earnings 0   0  
Transfers in 0   0  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale     500  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions 0   0  
Sales (500)   (500)  
Acquisitions 0   0  
Originations 0   0  
Balance at the end of period 0   0  
MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 19,449   21,003  
Total gains/(losses) (realized/unrealized)        
Included in earnings (1,099)   (2,653)  
Transfers in 141   141  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions 3,405   3,405  
Sales 0   0  
Acquisitions 0   0  
Originations 0   0  
Balance at the end of period 21,896   21,896  
IRLCs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 0   0  
Total gains/(losses) (realized/unrealized)        
Included in earnings (1,919)   (1,919)  
Transfers in 4,302   4,302  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale     0  
Transfer from residential loans held for sale to residential loans   0  
Paydowns/Distributions 0   0  
Sales 0   0  
Acquisitions 0   0  
Originations 0   0  
Balance at the end of period $ 2,383   $ 2,383