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Fair Value of Financial Instruments - Schedule of Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Assets |  |  |
Mortgage servicing rights | $ 21,003,000 | $ 0 | $ 0
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized (losses) gains, net | Unrealized (losses) gains, net | Unrealized (losses) gains, net
Liabilities |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized (losses) gains, net | Unrealized (losses) gains, net | Unrealized (losses) gains, net
Level 3 |  |  |
Assets |  |  |
Mortgage servicing rights | $ 616,000 | $ 0 | $ 0
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets |  |  |
Unrealized gains (losses) | 8,611,000 | (8,086,000) | (124,834,000)
Level 3 | Residential loans |  |  |
Assets |  |  |
Unrealized gains (losses) | (7,966,000) | 321,000 | (57,892,000)
Level 3 | Residential loans held in securitization trusts |  |  |
Assets |  |  |
Unrealized gains (losses) | (10,005,000) | 56,576,000 | (219,647,000)
Level 3 | Multi-family Loans |  |  |
Assets |  |  |
Unrealized gains (losses) | (4,750,000) | 645,000 | (1,737,000)
Level 3 | Equity investments |  |  |
Assets |  |  |
Unrealized gains (losses) | (6,319,000) | (7,958,000) | (4,338,000)
Level 3 | Equity investments in disposal group held for sale |  |  |
Assets |  |  |
Unrealized gains (losses) | 0 | 0 | (1,430,000)
Level 3 | Collateralized debt obligations | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Liabilities |  |  |
Unrealized gains (losses) | $ (5,709,000) | $ (1,930,000) | $ 92,431,000

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