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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Jul. 31, 2020 GBP (£) | May 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  | 100.00% |  | 100.00%
Increase (decrease) in General CECL Allowance |  |  |  |  |  | $ (5,800) |  |  | $ 12,000 |  |
Interest receivable |  |  |  |  |  | 38,401 |  |  | 38,401 |  | $ 35,581
Amortized cost of loans in cost recovery |  |  |  |  |  | 408,666 |  |  | 408,666 |  | $ 136,300
Interest received for loans in cost recovery |  |  |  |  |  | 300 |  |  | 1,600 |  |
Specific CECL allowance |  |  |  |  |  | 550 |  |  | (139,950) |  |
Payment in kind interest |  |  |  |  |  | 12,500 |  | $ 13,700 | 37,300 | $ 42,800 |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  | 0 |  | $ 300 | 200 | $ 4,000 |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  | $ 81,300 | £ 62.2 |  |  |  |  |  |
Sale of Unfunded Commitment of Senior Mortgage |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  | $ 65,300 | £ 50.0 |  |  |  |  |  |
Sale of Construction Loan Interests |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitments sold |  |  | $ 376,900 |  |  |  |  |  |  |  |
Funded amount of interests sold |  |  | $ 127,000 |  |  |  |  |  |  |  |
Percentage agreed to indemnify each buyer on loss |  |  | 10.00% |  |  |  |  |  |  |  |
Realized loss |  |  | $ 1,400 |  |  |  |  |  |  |  |
Sale of Inventory Loan |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized loss | $ 1,000 |  |  |  |  |  |  |  |  |  |
Outstanding principal on loan | $ 124,200 | £ 97.5 |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  | (139,950) |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum exposure to loss |  |  |  |  |  | 68,100 |  |  | $ 68,100 |  |
Maximum exposure to loss, term |  |  |  |  |  |  |  |  | 6 years 25 days |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  | 95.00% |  | 95.00%
Hotel - New York City |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  |  |  | 144,500 |  |  | $ 144,500 |  |
Borrower contributed additional equity |  |  |  |  |  |  |  |  | 15,000 |  |
Principal Amount |  |  |  |  |  | $ 142,800 |  |  | $ 142,800 |  |
Specific CECL allowance |  |  |  |  |  |  | $ 15,000 |  |  |  |

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