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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Assets carried at fair value        
Investment securities available for sale: $ 5,109,601,000   $ 3,828,544,000  
Derivative assets:        
Interest rate caps 5,047,000   64,950,000  
Mortgage servicing rights 19,449,000 $ 20,297,000 21,003,000 $ 0
Derivative liabilities        
Derivative assets 374,000   56,000  
Variation Margin 63,320,000   9,120,000  
Interest rate caps        
Derivative assets:        
Interest rate caps 269,000   56,000  
TBAs        
Derivative assets:        
Interest rate caps 105,000      
Interest rate swaps        
Derivative assets:        
Interest rate caps 4,673,000   63,942,000  
Derivative liabilities        
Variation Margin 46,795,000   0  
U.S. Treasury futures        
Derivative assets:        
Interest rate caps     952,000  
Derivative liabilities        
Variation Margin 6,041,000   0  
Credit default swaps        
Derivative liabilities        
Variation Margin 10,484,000   9,120,000  
Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 4,929,799,000   3,136,812,000  
U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 140,435,000   622,045,000  
Fair Value, Measurements, Recurring        
Assets carried at fair value        
Equity investments 91,440,000   113,492,000  
Derivative assets:        
Assets of disposal group held for sale 558,000   67,000  
Total 9,322,448,000   7,891,092,000  
Derivative liabilities        
Total 2,763,897,000   2,195,990,000  
Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 137,418,000   60,310,000  
Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 269,000   56,000  
Fair Value, Measurements, Recurring | TBAs        
Derivative assets:        
Interest rate caps 105,000   0  
Fair Value, Measurements, Recurring | Interest rate swaps        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Fair Value, Measurements, Recurring | U.S. Treasury futures        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Fair Value, Measurements, Recurring | Credit default swaps        
Derivative liabilities        
Derivative liabilities 0   0  
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures        
Derivative liabilities        
Variation Margin 63,300,000   45,000,000  
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House        
Derivative liabilities        
Derivative liabilities 68,000,000   19,900,000  
Derivative assets 4,700,000   64,900,000  
Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans, at fair value 367,089,000   632,266,000  
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans, at fair value 1,199,383,000   965,672,000  
Liabilities carried at fair value        
Consolidated SLST 1,031,897,000   811,591,000  
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans, at fair value 2,459,555,000   2,243,800,000  
Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 4,929,799,000   3,136,812,000  
Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 39,367,000   69,687,000  
Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 140,435,000   622,045,000  
Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 74,999,000   86,192,000  
Fair Value, Measurements, Recurring | Mortgage servicing rights        
Derivative assets:        
Mortgage servicing rights 19,449,000   21,003,000  
Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 1,526,481,000   1,253,332,000  
Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST 68,101,000   70,757,000  
Level 1 | Fair Value, Measurements, Recurring        
Assets carried at fair value        
Equity investments 0   0  
Derivative assets:        
Assets of disposal group held for sale 0   0  
Total 0   0  
Derivative liabilities        
Total 0   0  
Level 1 | Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 0   0  
Level 1 | Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 0   0  
Level 1 | Fair Value, Measurements, Recurring | TBAs        
Derivative assets:        
Interest rate caps 0   0  
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury futures        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 1 | Fair Value, Measurements, Recurring | Credit default swaps        
Derivative liabilities        
Derivative liabilities 0   0  
Level 1 | Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Liabilities carried at fair value        
Consolidated SLST 0   0  
Level 1 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Level 1 | Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 1 | Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 0   0  
Level 1 | Fair Value, Measurements, Recurring | Mortgage servicing rights        
Derivative assets:        
Mortgage servicing rights 0   0  
Level 1 | Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 0   0  
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST 0   0  
Level 2 | Fair Value, Measurements, Recurring        
Assets carried at fair value        
Equity investments 0   0  
Derivative assets:        
Assets of disposal group held for sale 58,000   67,000  
Total 5,110,033,000   3,828,667,000  
Derivative liabilities        
Total 1,732,000,000   1,384,399,000  
Derivative assets 374,000   56,000  
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 137,418,000   60,310,000  
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 269,000   56,000  
Level 2 | Fair Value, Measurements, Recurring | TBAs        
Derivative assets:        
Interest rate caps 105,000   0  
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury futures        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 2 | Fair Value, Measurements, Recurring | Credit default swaps        
Derivative liabilities        
Derivative liabilities 0   0  
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset        
Derivative assets:        
Assets of disposal group held for sale 100,000   100,000  
Level 2 | Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Liabilities carried at fair value        
Consolidated SLST 0   0  
Level 2 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans, at fair value 0   0  
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 4,929,799,000   3,136,812,000  
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 39,367,000   69,687,000  
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 140,435,000   622,045,000  
Level 2 | Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 0   0  
Level 2 | Fair Value, Measurements, Recurring | Mortgage servicing rights        
Derivative assets:        
Mortgage servicing rights 0   0  
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 1,526,481,000   1,253,332,000  
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST 68,101,000   70,757,000  
Level 3 | Mortgage servicing rights        
Derivative assets:        
Mortgage servicing rights 19,449,000      
Level 3 | Fair Value, Measurements, Recurring        
Assets carried at fair value        
Equity investments 91,440,000   113,492,000  
Derivative assets:        
Assets of disposal group held for sale 500,000   0  
Total 4,212,415,000   4,062,425,000  
Derivative liabilities        
Total 1,031,897,000   811,591,000  
Level 3 | Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 0   0  
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 0   0  
Level 3 | Fair Value, Measurements, Recurring | TBAs        
Derivative assets:        
Interest rate caps 0   0  
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury futures        
Derivative assets:        
Interest rate caps 0   0  
Derivative liabilities        
Derivative liabilities 0   0  
Level 3 | Fair Value, Measurements, Recurring | Credit default swaps        
Derivative liabilities        
Derivative liabilities 0   0  
Level 3 | Fair Value, Measurements, Recurring | VIE, Primary Beneficiary | Derivative Asset        
Derivative assets:        
Assets of disposal group held for sale 500,000      
Level 3 | Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans, at fair value 367,089,000   632,266,000  
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans, at fair value 1,199,383,000   965,672,000  
Liabilities carried at fair value        
Consolidated SLST 1,031,897,000   811,591,000  
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans, at fair value 2,459,555,000   2,243,800,000  
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 0   0  
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 74,999,000   86,192,000  
Level 3 | Fair Value, Measurements, Recurring | Mortgage servicing rights        
Derivative assets:        
Mortgage servicing rights 19,449,000   21,003,000  
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 0   0  
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST $ 0   $ 0