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Fair Value of Financial Instruments - Schedule of Valuation for Level 3 Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 3,739,103 $ 3,410,684 $ 3,327,211 $ 3,801,370
Total gains/(losses) (realized/unrealized)        
Included in earnings 94,356 (45,726) 92,173 (13,188)
Transfers out (26,577) (9,419) (71,348) (13,913)
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   9,390   40,323
Paydowns/Distributions (301,538) (281,168) (822,234) (925,012)
Sales (117,915) (18,604) (149,833) (19,210)
Purchases 624,162 187,829 1,635,622 382,616
Balance at the end of period $ 4,011,591 $ 3,252,986 $ 4,011,591 $ 3,252,986
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
Residential loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 667,218 $ 757,264 $ 827,535 $ 1,081,384
Total gains/(losses) (realized/unrealized)        
Included in earnings 14,397 (7,392) 15,554 (7,220)
Transfers out (25,064) (7,441) (66,065) (10,198)
Transfers to securitization trust, net (354,169) (54,332) (987,452) (244,414)
Funding/Contributions   0   0
Paydowns/Distributions (77,187) (103,660) (223,643) (389,032)
Sales (117,915) (18,604) (143,125) (18,769)
Purchases 593,575 171,104 1,278,051 325,188
Balance at the end of period 700,855 736,939 700,855 736,939
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 1,004,944 789,969 754,860 827,582
Total gains/(losses) (realized/unrealized)        
Included in earnings 26,939 (31,425) 24,250 (40,458)
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   0   0
Paydowns/Distributions (23,300) (15,940) (55,584) (44,520)
Sales 0 0 0 0
Purchases 0 0 285,057 0
Balance at the end of period 1,008,583 742,604 1,008,583 742,604
Residential loans held in securitization trusts        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 1,831,029 1,589,579 1,501,908 1,616,114
Total gains/(losses) (realized/unrealized)        
Included in earnings 44,079 (11,788) 38,841 16,114
Transfers out (1,513) (1,978) (5,283) (3,715)
Transfers to securitization trust, net 354,169 54,332 987,452 244,414
Funding/Contributions   0   0
Paydowns/Distributions (190,645) (132,518) (521,018) (415,562)
Sales 0 0 (6,708) (441)
Purchases 30,587 16,725 72,514 57,428
Balance at the end of period 2,067,706 1,514,352 2,067,706 1,514,352
Multi-family loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 92,997 97,422 95,792 87,534
Total gains/(losses) (realized/unrealized)        
Included in earnings 2,887 2,695 3,404 9,024
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   0   15,405
Paydowns/Distributions (8,270) (1,682) (11,582) (13,528)
Sales 0 0 0 0
Purchases 0 0 0 0
Balance at the end of period 87,614 98,435 87,614 98,435
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 142,915 168,755 147,116 179,746
Total gains/(losses) (realized/unrealized)        
Included in earnings 6,054 4,806 10,124 13,289
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   9,390   24,918
Paydowns/Distributions (2,136) (27,368) (10,407) (62,370)
Sales 0 0 0 0
Purchases 0 0 0 0
Balance at the end of period $ 146,833 155,583 $ 146,833 155,583
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   7,695   9,010
Total gains/(losses) (realized/unrealized)        
Included in earnings   (2,622)   (3,937)
Transfers out   0   0
Transfers to securitization trust, net   0   0
Funding/Contributions   0   0
Paydowns/Distributions   0   0
Sales   0   0
Purchases   0   0
Balance at the end of period   $ 5,073   $ 5,073