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Assets and Liabilities Related to Real Estate Owned - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2022 | Jun. 29, 2021 | May 24, 2021 | Dec. 31, 2020 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2017 | Dec. 31, 2015 | Jun. 30, 2015
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate held-for-sale, impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |
Total carrying value, net |  | $ 226,500 |  |  |  | $ 8,731,306 |  |  |  |  | $ 8,731,306 |  |  | $ 7,857,260 |  |  |  |
Debt related to real estate owned, held for investment, net (net of deferred financing costs of $4,857 in 2022) |  |  |  |  |  | 159,978 |  |  |  |  | 159,978 |  |  | 0 |  |  |  |
Specific CECL Allowance, net |  |  |  | $ 10,000 |  | (53,000) | $ (10,000) |  | $ 20,000 |  | (26,000) | $ (30,000) |  |  |  |  |  |
Realized loss on investments |  |  |  |  |  | (43,577) |  | $ 0 |  |  | (43,577) | $ 20,000 |  |  |  |  |  |
Real estate investment property, net |  | 270,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized investment gain |  | 43,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, unencumbered liquidity, threshold |  |  |  |  |  | 100,000 |  |  |  |  | 100,000 |  |  |  |  |  |  |
Debt Instrument, Covenant, Net Worth Threshold |  |  |  |  |  | 600,000 |  |  |  |  | $ 600,000 |  |  |  |  |  |  |
Secured Overnight Financing Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate for repurchase facility |  |  |  |  |  |  |  |  |  |  | 2.55% |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of borrowings |  |  |  |  |  | 388,400 |  |  |  |  | $ 388,400 |  |  |  |  |  |  |
JV Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing receivable, loan in process |  | $ 164,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JV Partner | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 187,100 |  |  |  |  | 187,100 |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1],[2] |  |  |  |  | 717,837 |  |  |  |  | 717,837 |  |  | 844,948 |  |  |  |
Subordinate Mortgage Portfolio Segment | Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | $ 206,800 |  |  |  |  | $ 206,800 |  |  | $ 97,800 |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Realized loss on investments |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  |
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,000 |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Washington D.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |
Hotel - Washington D.C. | Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  | $ 20,000
Hotel - Washington D.C. | Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,500
Payments to acquire mortgage notes receivable |  |  |  | 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net (net of deferred financing costs of $4,857 in 2022) |  |  |  | $ 110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000
Payments for mortgage loans |  |  | $ 110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multifamily Development - Brooklyn, NY | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment, net (net of deferred financing costs of $4,857 in 2022) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,200 |
Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |
Multifamily Development - Brooklyn, NY | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  |  |  | (3,000) |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  |  | $ 10,000 |  | $ (20,000) |  |  |  |  |  |  |  |  |
[1] | Includes $187,138 and $0 pledged as collateral under secured debt arrangements in 2022 and 2021, respectively.
[2] | Net of $140,985 and $178,588 CECL Allowances in 2022 and 2021, respectively, comprised of $119,000 and $145,000 Specific CECL Allowance and $21,985 and $33,588 General CECL Allowance, respectively.

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