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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Indicates line item in statement of income or comprehensive income that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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