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Real Estate Owned - Brooklyn Multifamily Development - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Feb. 28, 2025 | Dec. 31, 2024 | Dec. 31, 2022
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net | $ 402,945 |  |  |  | $ 402,945 |  |  |  | $ 324,587 |  |
Commercial mortgage loans, net | 8,303,645 |  |  |  | 8,303,645 |  |  |  | 7,104,156 |  |
Financing receivable, construction and finance costs capitalized | 22,700 |  | $ 44,000 |  | $ 75,700 |  | $ 121,400 |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  | Secured Overnight Financing Rate [Member] | Secured Overnight Financing Rate [Member] |  |  |  |  |  |
Debt instrument, covenant, unencumbered liquidity, threshold | 100,000 |  |  |  | $ 100,000 |  |  |  |  |  |
Debt instrument, covenant, net worth threshold | 600,000 |  |  |  | 600,000 |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  |  | $ 73,700 |  |  |  |  |  |  |
Real estate owned, accumulated depreciation | 31,035 |  |  |  | 31,035 |  |  |  | 23,266 |  |
Net loss | 700 |  | $ 1,900 |  | 6,900 |  | $ 8,100 |  |  |  |
Interest rate caps | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) | 238,535 |  |  |  | 238,535 |  |  |  | 238,535 |  |
Derivative Financial Instruments, Assets | Interest rate caps | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) | 100 |  |  |  | 100 |  |  |  | 400 |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings | 388,400 |  |  |  | $ 388,400 |  |  |  |  |  |
Line of credit facility, option to extend, period |  |  |  |  | 1 year |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net | 329,800 |  |  |  | $ 329,800 |  |  |  | 252,000 |  |
Less: deferred financing costs | 1,100 |  |  |  | 1,100 |  |  |  | 2,000 |  |
JV Partner |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Financing receivable, loan in process |  |  |  |  |  |  |  |  |  |  | $ 164,800
JV Partner | Joint venture |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  | 100.00%
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans, net | 153,790 | [1] |  |  | $ 153,790 | [1] |  | $ 24,000 | 388,809 | [1] |
Multifamily Development - Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate for repurchase facility |  |  |  |  | 2.55% |  |  |  |  |  |
Net loss | (800) |  |  |  | $ (800) |  |  |  |  |  |
Multifamily Development - Brooklyn, NY | Building |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate owned, held for investment, net | 393,200 |  |  |  | 393,200 |  |  |  |  |  |
Real estate owned, accumulated depreciation | 100 |  |  |  | 100 |  |  |  |  |  |
Multifamily Development - Brooklyn, NY | Furniture Fixtures and Equipment |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate owned, accumulated depreciation | 2,100 |  |  |  | 2,100 |  |  |  |  |  |
Deed-In-Lieu Of Foreclosure |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans, net | 616,600 |  |  |  | 616,600 |  |  |  | 540,900 |  |
Capitalized construction and financing costs | $ 393,300 |  |  |  | $ 393,300 |  |  |  | $ 319,700 |  |
[1] | Net of $374,257 and $373,336 CECL Allowances comprised $39,257 and $30,836 General CECL Allowance in 2025 and 2024, respectively, and $335,000 and $342,500 Specific CECL Allowance in 2025 and 2024, respectively.

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