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Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 4,114,786 $ 3,332,953 $ 4,062,425 $ 3,327,211
Total gains/(losses) (realized/unrealized)        
Included in earnings $ 28,492 $ 6,827 $ 77,344 $ (2,182)
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 out $ (7,431) $ (23,705) $ (30,596) $ (44,771)
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions (422,438) (279,691) (784,257) (520,697)
Sales (28,598) (3,006) (36,950) (31,918)
Acquisitions 527,604 705,725 924,449 1,011,460
Balance at the end of period 4,212,415 3,739,103 4,212,415 3,739,103
Residential loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 445,562 640,729 632,266 827,535
Total gains/(losses) (realized/unrealized)        
Included in earnings 922 4,081 6,779 1,157
Transfers out (4,220) (22,821) (26,726) (41,001)
Transfer to securitization trust, net (220,882) (262,479) (685,096) (633,283)
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions (64,074) (83,738) (120,805) (146,456)
Sales (28,598) (3,006) (30,673) (25,210)
Acquisitions 238,379 394,452 591,344 684,476
Balance at the end of period 367,089 667,218 367,089 667,218
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 959,250 738,126 965,672 754,860
Total gains/(losses) (realized/unrealized)        
Included in earnings 16,009 (2,551) 27,752 (2,689)
Transfers out 0 0 0 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions (23,281) (15,688) (41,446) (32,284)
Sales 0 0 0 0
Acquisitions 247,405 285,057 247,405 285,057
Balance at the end of period 1,199,383 1,004,944 1,199,383 1,004,944
Residential loans held in securitization trusts        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 2,508,456 1,724,250 2,243,800 1,501,908
Total gains/(losses) (realized/unrealized)        
Included in earnings 11,606 (3,465) 36,984 (5,238)
Transfers out (3,211) (884) (3,870) (3,770)
Transfer to securitization trust, net 220,882 262,479 685,096 633,283
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions (319,998) (177,567) (581,878) (330,373)
Sales 0 0 (6,277) (6,708)
Acquisitions 41,820 26,216 85,700 41,927
Balance at the end of period 2,459,555 1,831,029 2,459,555 1,831,029
Multi-family loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 87,222 91,905 86,192 95,792
Total gains/(losses) (realized/unrealized)        
Included in earnings 2,231 2,654 5,222 517
Transfers out 0 0 0 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions (14,454) (1,562) (16,415) (3,312)
Sales 0 0 0 0
Acquisitions 0 0 0 0
Balance at the end of period 74,999 92,997 74,999 92,997
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 0   0  
Total gains/(losses) (realized/unrealized)        
Included in earnings 0   0  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale 500   500  
Paydowns/Distributions 0   0  
Sales 0   0  
Acquisitions 0   0  
Balance at the end of period 500   500  
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 93,999 137,943 113,492 147,116
Total gains/(losses) (realized/unrealized)        
Included in earnings (1,428) 6,108 2,161 4,071
Transfers out 0 0 0 0
Transfer to securitization trust, net 0 0 0 0
Transfer to disposal group held for sale (500)   (500)  
Paydowns/Distributions (631) (1,136) (23,713) (8,272)
Sales 0 0 0 0
Acquisitions 0 0 0 0
Balance at the end of period 91,440 $ 142,915 91,440 $ 142,915
Mortgage servicing rights        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 20,297   21,003  
Total gains/(losses) (realized/unrealized)        
Included in earnings (848)   (1,554)  
Transfers out 0   0  
Transfer to securitization trust, net 0   0  
Transfer to disposal group held for sale 0   0  
Paydowns/Distributions   0  
Sales 0   0  
Acquisitions 0   0  
Balance at the end of period $ 19,449   $ 19,449