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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | May 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 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 |  |  |  |  | $ (15,700) |  | $ 17,800 |  |
Interest receivable | $ 44,016 |  |  |  | 44,016 |  | 44,016 |  | $ 35,581
Amortized cost of loans in cost recovery | 390,096 |  |  |  | 390,096 |  | 390,096 |  | $ 136,300
Interest received for loans in cost recovery |  |  |  |  | 600 |  | 1,200 |  |
Total |  |  |  |  | (9,500) |  | 140,500 |  |
Payment in kind interest |  |  |  |  | 12,400 | $ 14,600 | 24,800 | $ 29,100 |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  | 0 | $ 0 | 200 | $ 3,700 |
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 | 114,900 | $ 262,000 |  |  |  |  |  |  |
Funded amount of interests sold | 37,000 | $ 90,000 |  |  |  |  |  |  |
Percentage agreed to indemnify each buyer on loss |  | 10.00% |  |  |  |  |  |  |
Realized loss | $ 700 | $ 700 |  |  |  |  |  |  |
Sale of Construction Loan Interests, Two Loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Percentage of loan interests sold |  | 100.00% |  |  |  |  |  |  |
Sale of Construction Loan Interests, One Loan |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Percentage of loan interests sold | 60.00% | 40.00% |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  | 140,500 |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Maximum exposure to loss | $ 68,100 |  |  |  | 68,100 |  | $ 68,100 |  |
Maximum exposure to loss, term |  |  |  |  |  |  | 6 years 3 months 18 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 | 144,300 |  |  |  | 144,300 |  | $ 144,300 |  |
Borrower contributed additional equity |  |  |  |  |  |  | 15,000 |  |
Principal Amount | $ 142,800 |  |  |  | 142,800 |  | $ 142,800 |  |
Total |  |  |  |  | $ 15,000 |  |  |  |

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