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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2020 GBP (£) | Jan. 31, 2020 USD ($) | Jan. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£) | Oct. 31, 2020 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% of Portfolio |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |
Increase (decrease) in General CECL Allowance |  |  |  |  |  |  |  | $ (1,400,000) |  |  | $ 10,600,000 |  |  |  |  |  |
Interest receivable |  | $ 40,559,000 |  |  |  |  | $ 35,581,000 | 40,559,000 |  |  | 40,559,000 | $ 35,581,000 |  |  |  |  |
Amortized cost of loans in cost recovery |  | 373,538,000 |  |  |  |  | 136,300,000 | 373,538,000 |  |  | 373,538,000 | 136,300,000 |  |  |  |  |
Interest received for loans in cost recovery |  |  |  |  |  |  |  |  |  |  | 1,800,000 | 1,400,000 |  |  |  |  |
Total carrying value, net |  | 6,496,977,000 |  |  |  |  | 6,375,093,000 | 6,496,977,000 |  |  | 6,496,977,000 | 6,375,093,000 |  |  |  |  |
Principal balance |  | 6,535,079,000 |  |  |  |  | 6,375,093,000 | 6,535,079,000 |  |  | 6,535,079,000 | 6,375,093,000 |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  |  |  | (118,019,000) | (13,000,000.0) |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  |  | 46,700,000 | 54,600,000 | $ 43,500,000 |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  |  |  |  | 200,000 | 6,100,000 | 2,300,000 |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  | 42,465,000 | $ (2,487,000) |  |  |  |  |
Equity method investment, impairment (reversal) |  |  |  |  |  |  |  |  |  |  | (3,019,000) |  |  |  |  |  |
Past Due 30-59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total past due |  | 19,000,000.0 |  |  |  |  |  | 19,000,000.0 |  |  | 19,000,000.0 |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | 711,900,000 |  |  |  |  |  | 711,900,000 |  |  | $ 711,900,000 |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% of Portfolio |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.10% |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 422,700,000 | £ 309.2 |  |
Principal balance |  | 655,456,000 |  |  |  |  | 643,706,000 | 655,456,000 |  |  | $ 655,456,000 | $ 643,706,000 |  |  |  |  |
Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  | $ 81,300,000 | £ 62.2 | 30,300,000 |  |  |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  | 122,300,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Realized loss |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |
Sale of Inventory Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized loss |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal on loan |  |  | $ 124,200,000 | £ 97.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Of Residential-For-Sale Inventory Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  | 73,400,000 |  |  |  |  |  | 73,400,000 |  |  | 73,400,000 |  |  |  |  |  |
Realized loss on investment |  | (2,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  | 136,100,000 |  |  |  |  | 126,700,000 | 136,100,000 |  |  | 136,100,000 | 126,700,000 |  |  |  |  |
Principal balance |  | 6,535,079,000 |  |  |  |  | 6,375,093,000 | 6,535,079,000 |  |  | 6,535,079,000 | 6,375,093,000 |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  |  |  | (118,019,000) |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  | (42,465,000) |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 338,400,000 | £ 247.5 |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1] | 1,045,893,000 |  |  |  |  | 1,048,126,000 | 1,045,893,000 |  |  | 1,045,893,000 | $ 1,048,126,000 |  |  |  |  |
Principal balance |  | 1,066,981,000 |  |  |  |  |  | 1,066,981,000 |  |  | 1,066,981,000 |  |  |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |
Maximum exposure to loss |  | 68,100,000 |  |  |  |  |  | 68,100,000 |  |  | $ 68,100,000 |  |  |  |  |  |
Maximum exposure to loss, term |  |  |  |  |  |  |  |  |  |  | 5 years 9 months 18 days |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% of Portfolio |  |  |  |  |  |  |  |  |  |  | 95.00% | 95.00% |  |  |  |  |
Hotel - New York City |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | 144,700,000 |  |  |  |  |  | 144,700,000 |  |  | $ 144,700,000 |  |  |  |  |  |
Borrower contributed additional equity |  |  |  |  |  |  |  |  |  |  | 15,000,000.0 |  |  |  |  |  |
Principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,800,000
Principal amount |  | 142,800,000 |  |  |  |  |  | 142,800,000 |  |  | 142,800,000 |  |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |
Hotel - Pittsburgh, PA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | 21,500,000 |  |  |  |  |  | 21,500,000 |  |  | 21,500,000 |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  | $ 38,500,000 |  |  | 38,500,000 |  |  |  |
Borrower contributed additional equity |  |  |  |  |  |  |  |  |  | 11,000,000.0 |  |  |  |  |  |  |
Principal amount |  | 21,600,000 |  |  |  |  |  | 21,600,000 |  |  | 21,600,000 |  |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  |  | (9,500,000) |  |  |  |  |  |  |
Payments for (Proceeds from) Loans Receivable |  |  |  |  |  |  |  |  |  | (5,900,000) |  |  |  |  |  |  |
Commitment to lend |  | 11,400,000 |  |  |  |  |  | 11,400,000 |  |  | 11,400,000 |  |  |  |  |  |
Retail New York | Sale of Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  |  | $ 30,300,000 |  |  |  |  |
Retail New York | Sale Of Mezzanine Loan Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  |  | 122,300,000 |  |  |  |  |
Retail New York | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  | 470,800,000 |  |  |  |  | 470,800,000 |  |  |  |  |
Transferor's continuing involvement, arrangements of financial support, amount |  |  |  |  |  |  | $ 318,100,000 |  |  |  |  | $ 318,100,000 |  |  |  |  |
Office Campus Renton Washington | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  | $ 265,000,000.0 |  |  | 265,000,000.0 |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000.0 |  |  |  |
Cash flows between transferor and transferee, proceeds from new transfers, amount funded |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,700,000 |  |  |  |
Transferor's continuing involvement, arrangements of financial support, amount |  | 190,000,000.0 |  |  |  |  |  | 190,000,000.0 |  |  | 190,000,000.0 |  |  |  |  |  |
Qualitative and quantitative information, transferor's continuing involvement, arrangements of financial support, amount funded |  | $ 137,500,000 |  |  |  |  |  | $ 137,500,000 |  |  | 137,500,000 |  |  |  |  |  |
Residential Condominium - Bethesda, MD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000,000.0 |
Specific CECL allowance |  |  |  |  |  |  |  |  |  |  | (1,100,000) |  |  |  |  |  |
Realized loss |  |  |  |  |  |  |  |  |  |  | 14,100,000 |  |  |  |  |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance |  |  |  |  |  |  |  |  |  |  | (11,100,000) |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 |  |  |  |  |  |
[1] | Net of $213,102 CECL Allowances in 2020, comprised of $175,000 Specific CECL Allowance and $38,102 General CECL Allowance. Net of $56,981 provision for loan loss in 2019.

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