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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Details) $ in Thousands, £ in Millions | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) Rate | Dec. 31, 2020 USD ($) Rate | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 7,890,848 | $ 6,535,079 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
General CECL allowance | $ (33,588) | $ (38,102) |  |  |  |  |  |  |  |  |
Carrying value, net | 7,857,260 | 6,496,977 |  |  |  |  |  |  |  |  |
General CECL Allowance on unfunded commitments | 3,106 | 3,365 | $ 2,193 | $ 2,444 | $ 3,794 |  |  | $ 3,595 | $ 4,119 | $ 6,059 | $ 0
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 2,297,286 | $ 1,263,264 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 29.10% | 19.30% |  |  |  |  |  |  |  |  |
New York City |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 2,000,661 | $ 2,370,337 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 25.40% | 36.30% |  |  |  |  |  |  |  |  |
Other Europe |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,295,870 | $ 635,831 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 16.40% | 9.70% |  |  |  |  |  |  |  |  |
Germany |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 6.10% | 3.30% |  |  |  |  |  |  |  |  |
Sweden |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 3.60% |  |  |  |  |  |  |  |  |  |
Spain |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 3.30% | 4.20% |  |  |  |  |  |  |  |  |
Italy |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 2.60% | 2.20% |  |  |  |  |  |  |  |  |
Ireland |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 0.80% |  |  |  |  |  |  |  |  |  |
Southeast |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 708,920 | $ 581,301 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.00% | 8.90% |  |  |  |  |  |  |  |  |
Midwest |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 689,274 | $ 552,537 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.70% | 8.50% |  |  |  |  |  |  |  |  |
West |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 356,097 | $ 749,985 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.50% | 11.50% |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 542,740 | $ 381,824 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.90% | 5.80% |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 0.30% | 0.40% |  |  |  |  |  |  |  |  |
Southwest |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 3.50% | 2.80% |  |  |  |  |  |  |  |  |
Northeast |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 1.50% | 1.60% |  |  |  |  |  |  |  |  |
Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 1.60% | 1.00% |  |  |  |  |  |  |  |  |
Hotel |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,875,439 | $ 1,576,369 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.80% | 24.10% |  |  |  |  |  |  |  |  |
Office |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,700,779 | $ 1,911,145 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 21.60% | 29.20% |  |  |  |  |  |  |  |  |
Residential-for-sale |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 956,617 | $ 982,838 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 12.10% | 15.00% |  |  |  |  |  |  |  |  |
Urban Retail |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 711,592 | $ 655,456 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.00% | 10.00% |  |  |  |  |  |  |  |  |
Carrying value, net |  |  |  |  |  | $ 422,700 | £ 309.2 |  |  |  |
Residential-for-rent |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 477,569 | $ 189,260 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.10% | 2.90% |  |  |  |  |  |  |  |  |
Retail Center |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 414,740 | $ 105,344 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.30% | 1.60% |  |  |  |  |  |  |  |  |
Industrial |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 377,068 | $ 228,918 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.80% | 3.50% |  |  |  |  |  |  |  |  |
Healthcare |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 316,321 | $ 369,676 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.00% | 5.70% |  |  |  |  |  |  |  |  |
Mixed Use |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 269,839 | $ 217,164 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.40% | 3.30% |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value | $ 790,884 | $ 298,909 |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.90% | 4.70% |  |  |  |  |  |  |  |  |
Parking Garage |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 3.30% |  |  |  |  |  |  |  |  |  |
Caravan Park |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 2.80% |  |  |  |  |  |  |  |  |  |
Urban Predevelopment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 1.60% | 4.70% |  |  |  |  |  |  |  |  |
Multifamily Portfolio |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio | Rate | 2.20% |  |  |  |  |  |  |  |  |  |

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