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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 GBP (£) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 GBP (£) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00% |  |  |
Interest receivable |  |  |  | $ 39,411,000 |  |  |  |  | $ 39,411,000 |  | $ 40,559,000 |  |  |
Amortized cost of loans in cost recovery |  |  |  | 397,200,000 |  | $ 373,500,000 |  |  | 397,200,000 | $ 373,500,000 |  |  |  |
Interest received for loans in cost recovery |  |  |  | 400,000 |  | 600,000 |  |  | 800,000 | 1,200,000 |  |  |  |
Total carrying value, net |  |  |  | 7,520,105,000 |  | 6,496,977,000 |  |  | 7,520,105,000 | 6,496,977,000 | 6,496,977,000 |  |  |
Principal balance |  |  |  | 7,558,304,000 |  | 6,535,079,000 |  |  | 7,558,304,000 | 6,535,079,000 | 6,535,079,000 |  |  |
Increase in general CECL allowance |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Payment in kind interest |  |  |  | 13,700,000 |  | 12,400,000 |  |  | 30,600,000 | 24,800,000 |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  | 700,000 |  | 0 |  |  | 700,000 | 200,000 |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  |  |  | 751,500,000 |  |  |  |  | $ 751,500,000 |  | 711,900,000 |  |  |
Past Due 30-59 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  |  |  |  |  |  | $ 19,000,000.0 |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  | 10.90% |  | 10.00% |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 422,700,000 | £ 309.2
Principal balance |  |  |  | 820,466,000 |  |  |  |  | $ 820,466,000 |  | $ 655,456,000 |  |  |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  | $ 81,300,000 | £ 62.2 |  |  |  | $ 81,300,000 | £ 62.2 |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Sale of Unfunded Commitment of Senior Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  | $ 65,300,000 | £ 50.0 |  |  |  | $ 65,300,000 | £ 50.0 |  |  |  |  |  |
Sale of Construction Loan Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments sold |  |  |  |  |  | 376,900,000 |  |  |  |  |  |  |  |
Funded amount of interests sold |  |  |  |  |  | 127,000,000.0 |  |  |  |  |  |  |  |
Gain (loss) on loan interests sold |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | 146,500,000 |  |  |  |  | 146,500,000 |  | 136,100,000 |  |  |
Principal balance |  |  |  | 7,558,304,000 |  |  |  |  | 7,558,304,000 |  | 6,535,079,000 |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  | (20,000,000) |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  | 354,200,000 |  |  |  |  | 354,200,000 |  |  | £ 256.1 | $ 338,400,000 | £ 247.5
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1] |  |  | 866,908,000 |  |  |  |  | 866,908,000 |  | $ 1,045,893,000 |  |  |
Payment in kind interest |  |  |  |  | $ 800,000 |  |  |  |  | $ 0 |  |  |  |
Maximum exposure to loss |  |  |  | $ 68,300,000 |  |  |  |  | $ 68,300,000 |  |  |  |  |
Maximum exposure to loss, term |  |  |  |  |  |  |  |  | 5 years 3 months 18 days |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  |  | 97.00% |  | 95.00% |  |  |
[1] | Net of $183,199 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $38,199 and $38,102 General CECL Allowance, respectively.

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