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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 3,332,953 $ 3,671,383 $ 3,327,211 $ 3,801,370
Total gains/(losses) (realized/unrealized)        
Included in earnings 6,827 (22,424) (2,182) 32,539
Transfers out (23,705) (4,168) (44,771) (4,494)
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   8,985   30,933
Paydowns/Distributions (279,691) (348,917) (520,697) (643,844)
Sales (3,006) (441) (31,918) (607)
Purchases (3) 705,725 106,266 1,011,460 194,787
Balance at the end of period $ 3,739,103 $ 3,410,684 $ 3,739,103 $ 3,410,684
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 $ 640,729 $ 921,000 $ 827,535 $ 1,081,384
Total gains/(losses) (realized/unrealized)        
Included in earnings 4,081 772 1,157 173
Transfers out (22,821) (2,664) (41,001) (2,757)
Transfers to securitization trust, net (262,479) (103,972) (633,283) (190,082)
Funding/Contributions   0   0
Paydowns/Distributions (83,738) (144,017) (146,456) (285,372)
Sales (3,006) 0 (25,210) (166)
Purchases (3) 394,452 86,145 684,476 154,084
Balance at the end of period 667,218 757,264 667,218 757,264
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 738,126 829,153 754,860 827,582
Total gains/(losses) (realized/unrealized)        
Included in earnings (2,551) (24,154) (2,689) (9,033)
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   0   0
Paydowns/Distributions (15,688) (15,030) (32,284) (28,580)
Sales 0 0 0 0
Purchases (3) 285,057 0 285,057 0
Balance at the end of period 1,004,944 789,969 1,004,944 789,969
Residential loans held in securitization trusts        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 1,724,250 1,624,703 1,501,908 1,616,114
Total gains/(losses) (realized/unrealized)        
Included in earnings (3,465) (5,139) (5,238) 27,902
Transfers out (884) (1,504) (3,770) (1,737)
Transfers to securitization trust, net 262,479 103,972 633,283 190,082
Funding/Contributions   0   0
Paydowns/Distributions (177,567) (152,133) (330,373) (283,044)
Sales 0 (441) (6,708) (441)
Purchases (3) 26,216 20,121 41,927 40,703
Balance at the end of period 1,831,029 1,589,579 1,831,029 1,589,579
Multi-family loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 91,905 95,309 95,792 87,534
Total gains/(losses) (realized/unrealized)        
Included in earnings 2,654 3,440 517 6,329
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   8,985   15,405
Paydowns/Distributions (1,562) (10,312) (3,312) (11,846)
Sales 0 0 0 0
Purchases (3) 0 0 0 0
Balance at the end of period 92,997 97,422 92,997 97,422
Equity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 137,943 191,148 147,116 179,746
Total gains/(losses) (realized/unrealized)        
Included in earnings 6,108 5,032 4,071 8,483
Transfers out 0 0 0 0
Transfers to securitization trust, net 0 0 0 0
Funding/Contributions   0   15,528
Paydowns/Distributions (1,136) (27,425) (8,272) (35,002)
Sales 0 0 0 0
Purchases (3) 0 0 0 0
Balance at the end of period $ 142,915 168,755 $ 142,915 168,755
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   10,070   9,010
Total gains/(losses) (realized/unrealized)        
Included in earnings   (2,375)   (1,315)
Transfers out   0   0
Transfers to securitization trust, net   0   0
Funding/Contributions   0   0
Paydowns/Distributions   0   0
Sales   0   0
Purchases (3)   0   0
Balance at the end of period   $ 7,695   $ 7,695