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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) $ in Thousands, £ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 7,558,304 | $ 6,535,079 | $ 6,535,079 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00% | 100.00% |  |  |  |  |
General CECL allowance | $ (38,199) | $ (38,102) | $ (38,102) |  |  |  |  |
Carrying value, net | 7,520,105 | 6,496,977 | 6,496,977 |  |  |  |  |
General CECL Allowance on unfunded commitments | 2,444 | $ 4,119 | 3,365 | $ 3,794 |  |  | $ 6,059 | $ 0
New York City |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 2,355,270 |  | $ 2,370,337 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 31.20% |  | 36.30% |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 1,637,480 |  | $ 1,263,264 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 21.70% |  | 19.30% |  |  |  |  |
Midwest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 737,492 |  | $ 552,537 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.80% |  | 8.50% |  |  |  |  |
Southeast |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 655,490 |  | $ 581,301 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.70% |  | 8.90% |  |  |  |  |
West |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 552,475 |  | $ 749,985 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.30% |  | 11.50% |  |  |  |  |
Northeast |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 138,952 |  | $ 103,567 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 1.80% |  | 1.60% |  |  |  |  |
Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 1,481,145 |  | $ 914,088 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 19.50% |  | 13.90% |  |  |  |  |
Office |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 1,969,597 |  | $ 1,911,145 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 26.10% |  | 29.20% |  |  |  |  |
Hotel |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 1,520,275 |  | $ 1,576,369 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 20.10% |  | 24.10% |  |  |  |  |
Residential-for-sale |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 835,187 |  | $ 982,838 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 11.00% |  | 15.00% |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 820,466 |  | $ 655,456 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 10.90% |  | 10.00% |  |  |  |  |
Carrying value, net |  |  |  |  | $ 422,700 | £ 309.2 |  |
Industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 672,537 |  | $ 228,918 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.90% |  | 3.50% |  |  |  |  |
Mixed Use |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 238,702 |  | $ 217,160 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.20% |  | 3.30% |  |  |  |  |
Healthcare |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 367,120 |  | $ 369,676 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.90% |  | 5.70% |  |  |  |  |
Urban Predevelopment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 52,520 |  | $ 298,909 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 0.70% |  | 4.60% |  |  |  |  |
Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Carrying Value | $ 1,081,900 |  | $ 294,608 |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 14.20% |  | 4.60% |  |  |  |  |

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