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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 | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) Rate | Dec. 31, 2021 USD ($) Rate | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 30, 2020 USD ($) | Nov. 30, 2020 GBP (£)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 8,371,419 | $ 7,890,848 |  |  |  |
General CECL allowance | (21,377) | (33,588) |  |  |  |
Carrying value, net | $ 8,350,042 | $ 7,857,260 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00% |  |  |  |
General CECL Allowance on unfunded commitments | $ 3,928 | $ 3,106 | $ 3,794 | $ 3,365 |  |
New York City |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 2,295,383 | $ 2,000,661 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 27.40% | 25.40% |  |  |  |
United Kingdom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 1,989,250 | $ 2,297,286 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.80% | 29.10% |  |  |  |
Other Europe |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 1,494,435 | $ 1,295,870 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 17.90% | 16.40% |  |  |  |
Germany |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 5.60% | 6.10% |  |  |  |
Italy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 430.00% | 2.60% |  |  |  |
Spain |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 3.90% | 3.30% |  |  |  |
Sweden |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 330.00% | 3.60% |  |  |  |
Ireland |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 0.80% | 0.80% |  |  |  |
Southeast |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 769,205 | $ 708,920 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.20% | 9.00% |  |  |  |
Midwest |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 681,237 | $ 689,274 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.10% | 8.70% |  |  |  |
West |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 341,569 | $ 356,097 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.10% | 4.50% |  |  |  |
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 800,340 | $ 542,740 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.50% | 6.90% |  |  |  |
Percentage of Portfolio | Rate | 0.30% | 0.30% |  |  |  |
Northeast |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 5.90% | 1.50% |  |  |  |
Southwest |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 1.90% | 3.50% |  |  |  |
Mid-Atlantic |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 1.40% | 1.60% |  |  |  |
Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 1,980,780 | $ 1,700,779 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.70% | 21.60% |  |  |  |
Hotel |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 1,949,106 | $ 1,875,439 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 23.30% | 23.80% |  |  |  |
Residential-For-Sale, Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 896,714 | $ 956,617 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 10.70% | 12.10% |  |  |  |
Health Care |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 637,570 | $ 316,321 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.60% | 4.00% |  |  |  |
Retail Center |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 508,117 | $ 414,740 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.10% | 5.30% |  |  |  |
Residential-for-rent |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 470,861 | $ 477,569 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.60% | 6.10% |  |  |  |
Mixed Use |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 417,967 | $ 269,839 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 5.00% | 3.40% |  |  |  |
Industrial Property |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 358,221 | $ 377,068 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.40% | 4.80% |  |  |  |
Urban Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 364,953 | $ 711,592 |  |  |  |
Carrying value, net |  |  |  |  | $ 422,700 | £ 309.2
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 4.30% | 9.00% |  |  |  |
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying Value | $ 787,130 | $ 790,884 |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.30% | 9.90% |  |  |  |
Parking Garage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 310.00% | 3.30% |  |  |  |
Caravan Park |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 260.00% | 2.80% |  |  |  |
Multifamily Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 210.00% | 2.20% |  |  |  |
Urban Predevelopment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Portfolio | Rate | 150.00% | 1.60% |  |  |  |

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