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Real Estate Owned - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2022 USD ($) | Jun. 29, 2021 USD ($) | May 24, 2021 USD ($) | Sep. 30, 2023 USD ($) property | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2023 USD ($) property | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | $ 7,974,031,000 |  |  | $ 8,681,990,000 |  |  |  |  |  | $ 7,974,031,000 |  | $ 8,681,990,000 |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  |  |  | 161,245,000 |  |  | 160,294,000 |  |  |  |  |  | 161,245,000 |  | 160,294,000 |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  | $ 10,000,000 |  |  |  |  |  | $ (10,000,000) |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Depreciation and amortization on real estate owned |  |  |  |  | 1,020,000 |  |  |  | $ 0 |  |  |  |  | 7,208,000 | $ 704,000 |  |  |  |  |  |
Real estate held for sale, gain (loss) on reclassification |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Total net revenue |  |  |  |  | 500,000 |  |  |  | 1,100,000 |  |  |  |  | 4,300,000 | 5,300,000 |  |  |  |  |  |
Net realized loss on investment |  |  |  |  | 0 |  |  |  | $ 43,577,000 |  |  |  |  | (86,604,000) | $ 43,577,000 |  |  |  |  |  |
Debt instrument, covenant, unencumbered liquidity, threshold |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |
Debt instrument, covenant, net worth threshold |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,890,000 |  | 7,000,000 |  |  |  |  |
Financing receivable, loan specific, realized gain (loss) on writeoff |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |
Interest rate cap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  |  |  | 164,835,000 |  |  | 500,000,000 |  |  |  |  |  | 164,835,000 |  | 500,000,000 |  |  |  |  |
Derivative Financial Instruments, Assets | Interest rate cap | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Notional Amount (in thousands) |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |
Hotel Through a Died-in-Lieu Foreclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, loan specific, realized gain (loss) on writeoff |  |  |  |  |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate for repurchase facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.55% |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings |  |  |  |  | 388,400,000 |  |  |  |  |  |  |  |  | $ 388,400,000 |  |  |  |  |  |  |
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 |  |  |  |  | 161,200,000 |  |  | 160,300,000 |  |  |  |  |  | $ 161,200,000 |  | 160,300,000 |  |  |  |  |
Less: deferred financing costs |  |  |  |  | 3,600,000 |  |  | 4,500,000 |  |  |  |  |  | 3,600,000 |  | 4,500,000 |  |  |  |  |
JV Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, loan in process |  | $ 164,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JV Partner | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations, Held-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization on real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1],[2] |  |  |  | 412,777,000 |  |  | 560,881,000 |  |  |  |  |  | 412,777,000 |  | 560,881,000 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | 102,600,000 |  |  | 138,300,000 |  |  |  |  |  | 102,600,000 |  | 138,300,000 |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,500,000 |  |  |  |  |  |  |
Realized loss on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  | $ 81,980,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mezzanine Loans | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Hotel - Washington D.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Net assets acquired |  |  |  |  | 153,200,000 |  |  | 155,900,000 |  |  |  |  |  | 153,200,000 |  | 155,900,000 |  |  |  |  |
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |
Payments for mortgage loans |  |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Washington D.C. | Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Hotel - Washington D.C. | Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,500,000 |
Payments to acquire mortgage notes receivable |  |  |  | $ 24,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multifamily Development - Brooklyn, NY | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,200,000
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |
Multifamily Development - Brooklyn, NY | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Deed-In-Lieu Of Foreclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  | $ 226,500,000 |  |  | 349,300,000 |  |  | 302,700,000 |  |  |  |  |  | 349,300,000 |  | $ 302,700,000 |  |  |  |  |
Real estate investment property, net |  | 270,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized loss on investment |  | $ 43,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, construction and finance costs capitalized |  |  |  |  | 17,600,000 |  |  |  |  |  |  |  |  | 46,700,000 |  |  |  |  |  |  |
Residential-for-Sale - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  | $ 7,000,000 |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Residential-for-Sale - Manhattan, NY | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |
Hotel - Atlanta, GA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net revenue |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |
Real estate investment property, net |  |  |  |  | $ 75,300,000 |  | $ 75,000,000 |  |  |  |  |  |  | $ 75,300,000 |  |  |  |  |  |  |
Hotel - Atlanta, GA | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $213,139 and $191,608 pledged as collateral under secured debt arrangements in 2023 and 2022, respectively.
[2] | Net of $220,305 and $159,724 CECL Allowance in 2023 and 2022, respectively, comprised of $193,000 and $133,500 Specific CECL Allowance and $27,305 and $26,224 General CECL Allowance, respectively.

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