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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) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021 | Aug. 03, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 8,753,291 | $ 7,890,848 |  |  |  |  |  |  |
General CECL allowance | (21,985) | (33,588) |  |  |  |  |  |  |
Carrying value, net | $ 8,731,306 | $ 7,857,260 | $ 226,500 |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 100.00% | 100.00% |  |  |  |  |  |  |
General CECL Allowance on unfunded commitments | $ 2,812 | $ 3,106 |  | $ 3,999 | $ 3,928 | $ 2,193 | $ 2,444 | $ 3,794 | $ 3,365
United Kingdom |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 2,300,384 | $ 2,297,286 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 26.30% | 29.10% |  |  |  |  |  |  |
New York City |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 2,240,469 | $ 2,000,661 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 25.60% | 25.40% |  |  |  |  |  |  |
Other Europe |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,402,047 | $ 1,295,870 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 16.00% | 16.40% |  |  |  |  |  |  |
Italy |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 480.00% | 2.60% |  |  |  |  |  |  |
Germany |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 440.00% | 6.10% |  |  |  |  |  |  |
Spain |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 3.50% | 3.30% |  |  |  |  |  |  |
Sweden |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 260.00% | 3.60% |  |  |  |  |  |  |
Ireland |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 0.70% | 0.80% |  |  |  |  |  |  |
Midwest |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 623,233 | $ 689,274 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.10% | 8.70% |  |  |  |  |  |  |
Southeast |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 735,912 | $ 708,920 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 8.40% | 9.00% |  |  |  |  |  |  |
West |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 616,594 | $ 356,097 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.00% | 4.50% |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 834,652 | $ 542,740 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 9.60% | 6.90% |  |  |  |  |  |  |
Percentage of Portfolio | 30.00% | 0.30% |  |  |  |  |  |  |
Northeast |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 550.00% | 1.50% |  |  |  |  |  |  |
Southwest |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 240.00% | 3.50% |  |  |  |  |  |  |
Mid-Atlantic |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 140.00% | 1.60% |  |  |  |  |  |  |
Hotel |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,983,071 | $ 1,875,439 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 22.70% | 23.80% |  |  |  |  |  |  |
Office |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,750,260 | $ 1,700,779 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 20.00% | 21.60% |  |  |  |  |  |  |
Residential |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,629,031 | $ 1,434,186 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 18.60% | 18.20% |  |  |  |  |  |  |
Retail Site |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 1,318,862 | $ 1,126,332 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 15.10% | 14.30% |  |  |  |  |  |  |
Health Care |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 603,150 | $ 316,321 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.90% | 4.00% |  |  |  |  |  |  |
Mixed Use |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 529,200 | $ 269,839 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 6.00% | 3.40% |  |  |  |  |  |  |
Industrial Property |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 310,516 | $ 377,068 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 3.50% | 4.80% |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Carrying Value | $ 629,201 | $ 790,884 |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio | 7.20% | 9.90% |  |  |  |  |  |  |
Parking Garage |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 310.00% | 3.30% |  |  |  |  |  |  |
Caravan Park |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 210.00% | 2.80% |  |  |  |  |  |  |
Multifamily Development |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio |  | 2.20% |  |  |  |  |  |  |
Urban Predevelopment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Portfolio | 200.00% | 1.60% |  |  |  |  |  |  |

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