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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Assets carried at fair value        
Investment securities available for sale: $ 6,838,715,000   $ 3,828,544,000  
Residential loans held for sale 105,036,000   0  
Derivative assets:        
Interest rate caps 9,508,000   64,950,000  
Mortgage servicing rights 21,896,000 $ 19,449,000 21,003,000 $ 0
Derivative liabilities        
Derivative liabilities 121,000   0  
Derivative assets 2,612,000   56,000  
Variation Margin 67,495,000   9,120,000  
Interest rate caps        
Derivative assets:        
Interest rate caps 150,000   56,000  
IRLCs        
Derivative assets:        
Interest rate caps 2,383,000      
Interest rate swaps        
Derivative assets:        
Interest rate caps 3,402,000   63,942,000  
Derivative liabilities        
Variation Margin 52,662,000   0  
Futures        
Derivative assets:        
Interest rate caps 3,494,000   952,000  
Derivative liabilities        
Variation Margin 4,565,000   0  
Credit default swaps        
Derivative liabilities        
Variation Margin 10,268,000   9,120,000  
TBAs        
Derivative liabilities        
Variation Margin 0      
Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 6,628,003,000   3,136,812,000  
U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 182,538,000   622,045,000  
Fair Value, Measurements, Recurring        
Assets carried at fair value        
Residential loans held for sale 105,036,000   0  
Equity investments 28,825,000   113,492,000  
Derivative assets:        
Total 11,217,378,000   7,891,092,000  
Derivative liabilities        
Total 3,460,006,000   2,195,990,000  
Fair Value, Measurements, Recurring | Assets of disposal group held for sale        
Derivative assets:        
Assets of disposal group held for sale 0   67,000  
Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 257,590,000   60,310,000  
Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 150,000   56,000  
Fair Value, Measurements, Recurring | Options        
Derivative assets:        
Interest rate caps 79,000   0  
Fair Value, Measurements, Recurring | IRLCs        
Derivative assets:        
Interest rate caps 2,383,000   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 | 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 | TBAs        
Derivative liabilities        
Derivative liabilities 121,000   0  
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures        
Derivative liabilities        
Variation Margin 64,100,000   45,000,000  
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House        
Derivative liabilities        
Derivative liabilities 71,000,000   19,900,000  
Derivative assets 6,900,000   64,900,000  
Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 6,628,003,000   3,136,812,000  
Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 28,174,000   69,687,000  
Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 182,538,000   622,045,000  
Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans: 308,422,000   632,266,000  
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans: 1,182,599,000   965,672,000  
Liabilities carried at fair value        
Consolidated SLST 1,016,952,000   811,591,000  
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans: 2,660,626,000   2,243,800,000  
Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 68,647,000   86,192,000  
Fair Value, Measurements, Recurring | MSRs        
Derivative assets:        
Mortgage servicing rights 21,896,000   21,003,000  
Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 2,118,581,000   1,253,332,000  
Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST 66,762,000   70,757,000  
Level 1 | Fair Value, Measurements, Recurring        
Assets carried at fair value        
Residential loans held for sale 0   0  
Equity investments 0   0  
Derivative assets:        
Total 0   0  
Derivative liabilities        
Total 0   0  
Level 1 | Fair Value, Measurements, Recurring | Assets of disposal group held for sale        
Derivative assets:        
Assets of disposal group held for sale 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 | Options        
Derivative assets:        
Interest rate caps 0   0  
Level 1 | Fair Value, Measurements, Recurring | IRLCs        
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 | 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 | TBAs        
Derivative liabilities        
Derivative liabilities 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 | Residential loans        
Assets carried at fair value        
Residential loans: 0   0  
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans: 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: 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 | MSRs        
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        
Residential loans held for sale 0   0  
Equity investments 0   0  
Derivative assets:        
Total 6,838,944,000   3,828,667,000  
Derivative liabilities        
Derivative liabilities 121,000   0  
Total 2,443,054,000   1,384,399,000  
Derivative assets 229,000   56,000  
Level 2 | Fair Value, Measurements, Recurring | Assets of disposal group held for sale        
Derivative assets:        
Assets of disposal group held for sale 0   67,000  
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes        
Liabilities carried at fair value        
Senior unsecured notes 257,590,000   60,310,000  
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps        
Derivative assets:        
Interest rate caps 150,000   56,000  
Level 2 | Fair Value, Measurements, Recurring | Options        
Derivative assets:        
Interest rate caps 79,000   0  
Level 2 | Fair Value, Measurements, Recurring | IRLCs        
Derivative assets:        
Interest rate caps 0   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 | 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 | TBAs        
Derivative liabilities        
Derivative liabilities 121,000   0  
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset        
Derivative assets:        
Assets of disposal group held for sale     100,000  
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 6,628,003,000   3,136,812,000  
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS        
Assets carried at fair value        
Investment securities available for sale: 28,174,000   69,687,000  
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury securities        
Assets carried at fair value        
Investment securities available for sale: 182,538,000   622,045,000  
Level 2 | Fair Value, Measurements, Recurring | Residential loans        
Assets carried at fair value        
Residential loans: 0   0  
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans: 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: 0   0  
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 | MSRs        
Derivative assets:        
Mortgage servicing rights 0   0  
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations        
Liabilities carried at fair value        
Consolidated SLST 2,118,581,000   1,253,332,000  
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization        
Liabilities carried at fair value        
Consolidated SLST 66,762,000   70,757,000  
Level 3 | MSRs        
Derivative assets:        
Mortgage servicing rights 21,896,000      
Level 3 | Fair Value, Measurements, Recurring        
Assets carried at fair value        
Residential loans held for sale 105,036,000   0  
Equity investments 28,825,000   113,492,000  
Derivative assets:        
Total 4,378,434,000   4,062,425,000  
Derivative liabilities        
Total 1,016,952,000   811,591,000  
Level 3 | Fair Value, Measurements, Recurring | Assets of disposal group held for sale        
Derivative assets:        
Assets of disposal group held for sale 0   0  
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 | Options        
Derivative assets:        
Interest rate caps 0   0  
Level 3 | Fair Value, Measurements, Recurring | IRLCs        
Derivative assets:        
Interest rate caps 2,383,000   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 | 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 | TBAs        
Derivative liabilities        
Derivative liabilities 0   0  
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 | Residential loans        
Assets carried at fair value        
Residential loans: 308,422,000   632,266,000  
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary        
Assets carried at fair value        
Residential loans: 1,182,599,000   965,672,000  
Liabilities carried at fair value        
Consolidated SLST 1,016,952,000   811,591,000  
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts        
Assets carried at fair value        
Residential loans: 2,660,626,000   2,243,800,000  
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans        
Assets carried at fair value        
Multi-family loans 68,647,000   86,192,000  
Level 3 | Fair Value, Measurements, Recurring | MSRs        
Derivative assets:        
Mortgage servicing rights 21,896,000   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